The disclosed embodiment relates generally to the field of air conditioning and heating systems; more particularly, it concerns a system for efficiently combusting fossil fuels for heating a space.
The conventional methodology used in utilizing fossil fuels for heating habitable spaces in commercial, industrial and residential buildings or structures is firing the fuel in a controlled heating chamber or heat exchanger. The heat created by the burning fuel is drawn away by air or water flowing around the outside of the heat exchanger. This can be accomplished by blower fans or pumps. The heat is transferred into the surrounding air or water, heating the conditioned space. The waste or emissions from the combustion reaction is allowed to flow outdoors usually utilizing flue piping to a chimney or stack. The efficiency of the furnace or boiler is calculated by the amount of heat which can be extracted from the heat exchanger and utilized to heat the conditioned space and the percentage of heat and by-products permitted to escape through the flue to be vented outside. This rating or efficiency quantification is placed on the furnace or boiler to depict how efficient it will be.
Releasing carbon and heat saturated emissions into the atmosphere contribute to environmental problems, such as global warming. Not only does carbon monoxide and carbon dioxide add to blanketing the release of heat into space, discharging heat through flue gas emissions adds to this issue by heat pollution. Just an average low to medium efficient residential natural gas, LPG or oil furnace can emit about a half million BTU's of heat waste into the atmosphere each day. Commercial and industrial units can discharge hundreds of millions, and occasionally billions, of BTU's per unit per day. In addition, these common and conventional methods of discharging the flue gas into the atmosphere are wasteful and inefficient.
The foregoing aspects and other features of the disclosed embodiment are explained in the following description, taken in connection with the accompanying drawings, wherein:
Like reference numerals refer to like parts throughout the several views of the drawings.
As illustrated in the accompanying drawings, the aspects of the disclosed embodiment are directed to a heat and energy recovery assembly and system, in addition to methods of using the same. The heat and energy recovery assembly and system in accordance with aspects of the disclosed embodiment may be adapted for use with any suitable heating unit such as in a furnace of an HVAC system, boiler system or any other system where heat energy from fuel combustion is utilized for heating air spaces or other fluid medium. Although the aspects of the disclosed embodiment will be described with reference to the drawings, it should be understood that the aspects of the disclosed embodiment can be embodied in many forms. In addition, any suitable size, shape or type of elements or materials could be used.
Ire one aspect of the disclosed embodiment, a heat recovery assembly/system 100 is provided, as illustrated in
The heat recovery assembly/system 100 of the aspects of the disclosed embodiment include a multiple stage heat exchange system 120EX that is configured to recover heat lost during, for example, the warm up and cool down periods of the furnace. Further, in a conventional system the furnace is in an on state (e.g. burners FBRN lit) for 100% of the time during the heat call. The aspects of the disclosed embodiment described herein operate to discontinuously run the furnace 2000 in short bursts during a heat call so that the furnace 2000 is cycled on and off to achieve a higher efficiency by creating the start up and cool down furnace cycles/periods as frequently as, for example, 20 times per hour (based on, for example, a 1 hour long heat call) where, for example, during each 180 second cycle the burners FBRN are on for approximately 100 seconds and off for about 80 seconds so that heat is extracted/recovered during the start up and cool down periods, as described herein, to increase furnace efficiency and decrease fuel consumption. As will be described herein, during the furnace off times at least one stage of the multiple stage heat exchange system 120EX extracts residual heat from the furnace 2000 to balance a heat exchange to the supply air for heating the habitat (e.g. the multiple stage heat exchange system 120EX operates as a thermal balance to maintain a temperature of the supply air above a predetermined set point for heating the habitat during periods of the heat call where the furnace 2000 is turned off).
In one aspect, the assembly 100 includes a heat recovery chamber 110 which comprises a cooling intake 112 and an exhaust gas or emissions intake 114 for receiving exhaust gas and waste products emitted as a result of fuel combustion. It should be understood that while the heat recovery chamber 110 is illustrated in the figures as being cuboid in shape in other aspects the heat recovery chamber 110 has any suitable shape and/or configuration. For example, in other aspects, the heat recovery chamber 110 is a cylindrical drum, a pyramid or any other suitable shape. In one aspect, referring to
The assembly 100 further includes a portion of the multiple stage heat exchange system 120EX such as the first multiple stage heat exchanger or absorber 116 (referred to herein as heat exchanger 116) noted above. In one aspect the first heat exchanger 116 is disposed within the heat recovery chamber 110 while in other aspects the first heat exchanger 116 is communicably coupled to the heat recovery chamber 110 in any suitable manner. For example, as described above with respect to
It should be understood that while the first heat exchanger 116 is illustrated as having two heat exchange elements 116A, 116B in
The cooling intake 112 has any suitable shape and/or configuration and in one aspect structured as a single intake or in other aspects as multiple intakes. The cooling intake(s) 112 are configured to introduce one or more of indoor air or cooling gas (which is discharged from the heat recovery chamber 110 and recirculated) into the heat recovery chamber 110. In one aspect the cooling intake 112 is a closed loop extending from the chamber exhaust 118 to the heat recovery chamber 110 as described below. As will also be described below, in one aspect the cooling intake includes an active or passive orifice ORIF (which in one aspect includes a valve 112V—see
In one aspect the one or more heat exchange elements 116A 116B of the first heat exchanger 116 are interconnected in any suitable manner to a respective stage of a multi-stage fluid circuit system. For example, heat exchange element is connected to stage one fluid circuit 120 and heat exchange element is connected to stage two fluid circuit 120A (e.g. each heat exchange element is interconnected with a fluid circuit that is separate and distinct (e.g. independently operable) from other fluid circuits of other heat exchange elements where each fluid circuit has its own compressor 150, 150A) where the fluid circuits 120, 120A are any suitable fluid circuits. In other aspects the one or more heat exchange elements 116A, 116B are interconnected to a common fluid circuit such that coolant is shared between the one or more heat exchange elements 116A, 116B. The respective fluid circuit(s) 120, 120A include any suitable conduit 122, 122A for conveying fluid within the respective fluid circuit 120, 120A. The multiple stage heat exchanger system 120EX of the assembly 100 includes a second multiple stage heat exchanger or emitter 130 (e.g. a heat extraction exchanger) including one or more heat exchange elements 130A, 130B disposed exterior to the heat recovery chamber 110 such that each heat exchanger 130A, 130B of the second multiple stage heat exchanger 130 (referred to herein as heat exchanger 130) is in fluid communication with a respective fluid circuit 120, 120A via the respective conduit 122, 122A. In one aspect, heat exchange element 130A of the second heat exchanger 130 and heat exchange element 116A of the first heat exchanger 116 are communicably interconnected via the conduit 122 of the fluid circuit 120 such that the heat exchange element 116A of the first heat exchanger 116 contacts or otherwise interfaces with (e.g. within the heat recovery chamber 110 or in any other suitable manner as described herein) the mixture made up of cooling gas introduced via the cooling intake 112 and exhaust gas introduced via the exhaust gas intake 114, while the heat exchange element 130A of the second heat exchanger 130 contacts or otherwise interfaces in any suitable manner with air to be heated, outside of the heat recovery chamber 110. Similarly, heat exchange element 130B of the second heat exchanger 130 and heat exchange element 116B of the first heat exchanger 116 are communicably interconnected via the conduit 122A of the fluid circuit 120A such that the heat exchange element 116B of the first heat exchanger 116 contacts or otherwise interfaces with (e.g. within the heat recovery chamber 110 or in any other suitable manner as described herein) the mixture made up of cooling gas introduced via the cooling intake 112 and exhaust gas introduced via the exhaust gas intake 114, while the heat exchange element 130B of the second heat exchanger 130 contacts or otherwise interfaces in any suitable manner with air to be heated, outside of the heat recovery chamber 110. In other aspects, the heat exchange elements of the first and second heat exchangers 116, 130 are interconnected in any suitable manner. It should be realized, that while a two stage heat exchange system is illustrated and described in other aspects the heat exchange system has any suitable number of stages, such as more or less than two stages. As may also be realized, the heat exchange element 116A, fluid circuit 120 and heat exchange element 130A constitute the first stage of the multiple stage heat exchange system 120EX and the heat exchange element 116B, fluid circuit 120A and heat exchange element 130B constitute the second stage of the multiple stage heat exchange system 120EX.
Referring to
In one aspect the heat recovery chamber 110 includes exhaust and drainage components. An exhaust 118 for discharging the exhaust gas (e.g. a portion of which is recirculated as cooling gas) after heat exchange occurs is configured or otherwise structured to interconnect, for example, the heat recovery chamber 110 to the outside environment and/or to cooling intake 112 for recirculating at least a portion of the exhaust gas (e.g. the cooling gas) back into the heat recovery chamber 110 as will be described in greater detail below. The heat recovery assembly/system 100 when combined with, for example, a furnace 2000 having about an 80% efficiency produces exhaust gas temperatures (As described herein) that enable the exhaust duct (e.g. exhaust 118) to be formed of PVC rather than metal of ceramic (e.g. effects the coupling of a PVC exhaust duct to the combination of the heat recovery assembly/system 100 and the furnace 2000). In one aspect, the exhaust 118 is a single two-inch pvc vent pipe while in other aspects the exhaust 118 has any suitable size and is constructed of any suitable material such as composites, metals, etc. In one aspect a drain 111 is connected to the heat recovery chamber 110 and is configured to carry condensate water WD that may include particulates, ash and/or soot out of the heat recovery chamber 110. In one aspect for example, a mister 113 is included in the heat recovery chamber 110, however in other aspects the mister 113 is not provided. The mister 113 is configured to saturate the gas within the heat recovery chamber 110 with moisture and to help capture and remove particulates, ash and/or soot from the exhaust gases in any suitable manner, such as by the particulates, ash and/or soot becoming saturated with water from the flash heat steam from, for example, the super heated oil combustion exhaust gas and falling to the bottom of the chamber to be discharged through the drain 111. In other aspects, the mister 113 may not be provided such that the condensate water WD is formed from moisture in the exhaust gas and/or cooling gas introduced through cooling intake 112 and helps capture and remove particulates, ash and/or soot from the exhaust gases. In one aspect a filter or other mechanical separation unit is provided to remove the particulates, ash and/or soot from the condensate water WD discharged through the drain 111. Where the mister 113 is provided the mister 113 is, in one aspect, connected to a pressurized water tube to provide water to the heat recovery chamber 110 to raise the dew point within the heat recovery chamber 110 to raise the heat transfer potential.
The aspects of the disclosed embodiment illustrated in
During operation of the assembly and/or system of the disclosed embodiment, hot exhaust gases and combustion products (carbon monoxide, carbon dioxide, H20, etc.) are exhausted into the heat recovery chamber 110. In one aspect, one or more of indoor air and cooling gas is introduced into the heat recovery chamber 110 in any suitable manner to mix with the hot exhaust gas. A large, cubic footprint of gas is saturated and heated as a result of the mixing. This mixture flows across one or more heat exchange elements 116A, 116B of the first heat exchanger 116 while the dew point rises, holding water and heat (saturation). The heat is extracted from the mixture via the one or more heat exchange elements 116A, 116B of the first heat exchanger 116 (and third heat exchanger 117 when provided) and transferred to a respective one of the one or more heat exchange elements 130A, 130B of the second heat exchanger 130 such that heat transfer occurs at the one or more heat exchange elements 130A, 130B of the second heat exchanger 130 to heat, for example, indoor air or any other suitable medium. Cooler, dry gas from the heat recovery chamber 110 is exported outdoors in any suitable manner, such as through any suitable chimney or exhaust flue, with a reduced heat, moisture and carbon content. In addition, as described herein, at least a portion of the cooler, dry gas from the heat recovery chamber 110 is recirculated (e.g. as cooling gas) back into the heat recovery chamber 110. This process allows heat energy to be pulled from the gas introduced into the heat recovery chamber such that it is compounded with the heat energy already being produced by the fossil fuel combustion process. This provides the assembly and system described herein in accordance with the aspects of the disclosed embodiment the potential to achieve a higher efficiency of fuel burn.
By way of example and referring to
Within the teat recovery chamber 110 under controlled conditions, in one aspect, the cooling gas, described herein, is saturated by the misted water within the exhaust gas, resulting in an increase in the dew point while in other aspects the cooling gas is not misted. The heat energy released in the exhaust gas (which may have a temperature of approximately 375° F. or any other suitable temperature) mixes with the cooling gas, resulting in a mean temperature of approximately 160° F. (or any other suitable temperature). The combined gases include oxygen (O2) assisting in the heat transfer process. The combined gases are a warm (about 160° F. or other suitable temperature), high dew point gas having, for example, a high-energy potential for high efficiency heat and energy extraction.
This combined gas mixture passes over one or more of the heat exchange elements 116A, 116B of the first heat exchanger 116. The fluid, e.g. refrigerant, in the one or more heat exchange elements 116A, 116B of the first heat exchanger 116 is under controlled pressurized conditions and is able to extract a large amount of heat energy from the combined gas mixture and transfer the heat energy to the a respective one of the one or more heat exchange elements 130A, 130B of the second heat exchanger 130 via the respective fluid circuit 120, 120A such that the transferred heat energy warms the indoor air as the indoor air flows over the one or more heat exchange elements 130A, 130B of the second heat exchanger 130. The flow of refrigerant in the fluid circuit 120, 120A between each of the components of the assembly is illustrated by arrows in
Still referring to
In the active state the controller 1311 monitors whether the thermostat TSH temperature is satisfied (
If one or more heat exchangers require defrosting the controller 1311 determines if the call for defrosting is valid such that if the call for defrosting is not valid the controller 1311 returns to the active state (
Where the controller receives a furnace fail call from, for example, any suitable sensors connected to the furnace, the controller 1311 determines if the furnace fall call is valid and if the furnace fail call is not valid the controller 1311 returns to the active state (
Where the controller receives a heat recovery assembly fail call the controller 1311 determines if the heat recovery assembly fail call is valid and if the heat recovery assembly fail call is not valid the controller 1311 returns to the active state (
As described above, a temperature sensor TS is mounted on or within the furnace supply plenum or duct 1301 of the furnace 2000. When the furnace 2000 is burning gas (e.g. is turned on the heat recovery assembly 100 is extracting heat from the furnace exhaust gas and preheating the air in the return plenum 1300 so that hot air is produced at elevated temperatures compared to the furnace 2000 running by itself. The sensor TS is monitored by the controller 1311 (
If the thermostat TSH heat call is satisfied the controller 1311 returns to the monitoring state and the furnace 2000, compressor(s) 150, 150A and fan 140 are turned off (
The following is an exemplary table illustrating tests performed on various furnaces where the input/size is the btu rating of the furnace tested, cfm is the amount of air moved by the furnace tested, target is the targeted btus from the heat recovery assembly/system 100 to be added to the furnace heat output, the cycles per hour is the number of times the furnace tested was discontinuously run (e.g. turned on and off) over a one hour heat call, the average supply temperature (° F.) is the average temperature of the air passing through the return plenum 1300 during both furnace on and off states/periods, the average return temperature (° F.) is the average temperature of the air returning to the return plenum 1300 during both furnace on and off states/periods, the average delta temperature (° F.) is the difference between the average supply temperature and the average return temperature, the added btus are the btus recovered by the heat recovery assembly/system 100 described herein and the fuel btus is the amount of btus obtained from burning fuel during furnace on states/periods, efficiency is the fuel conversion efficiency of the furnace with the heat recovery assembly/system 100, variation is the difference between the target btus and the added btus, on second refers to the amount of firm the furnace was in the on state during each cycle of the discontinuous furnace operation, off seconds refers to the amount of time the furnace was in the off state during each cycle of the discontinuous furnace operation, therms is the amount of heat energy from fuel burned (e.g. the fuel btus), latent refers to an amount of heat (btus) of e-strained water and recovered by the heat recovery assembly/system 100 throughout the heating cycle, source is the amount of heat (btus) recovered by the heat recovery assembly/system 100 during furnace operation, and residual is the amount of heat (btus) recovered by the heat recovery assembly/system 100 during furnace cool down periods.
It is noted that all values in the above table are approximate and provided for exemplary purposes only. As can be seen from the above table, the discontinuous operation (e.g. cycling between on and off states) of the furnace during a heat call decreases an amount of fuel used during the heat call while the heat recovered during the latent, source and residual heating periods by the heat recovery assembly/system 100 increases the fuel conversion efficiency of the furnace 2000.
During the latent, source and residual heating periods (e.g. respectively the period where the furnace 2000 is warming the furnace heat exchanger FHX, the periods the furnace is on and the periods where the furnace 2000 is turned off during the heat call) one or more stages of the multiple stage heat exchanger 120EX operate as described herein to increase, balance or otherwise continue heat transfer to the return air travelling through the return plenum 1300 for heating the supply air delivered to the habitat through the supply plenum 1301. For example, in accordance with aspects of the disclosed embodiment, the stage one compressor 150 runs substantially 100% of the time (e.g. when the furnace is on and when the furnace is off) the during a full thermostat heat call cycle (e.g. a duration of the heat call) so as to extract heat (e.g. residual furnace heat) from the chamber 110 and transfer heat to the supply air. In one aspect the secondary compressor 150A only runs while the furnace is turned on (e.g. the furnace burners FBRN are lit) while in other aspects the secondary compressor 150A also runs when the furnace burners FBRN are not lit (e.g. the furnace is turned off). In other aspects, the first and second stages of the heat exchange system are operated at any suitable times, either together or individually, during the heat call. For example, in one aspect, only stage one operates during furnace off times and only stage two operates during furnace on times or vice versa. In another aspect, stage one operates to a point where a temperature of the supply air reaches a predetermined temperature at which time stage one is turned off and stage two is turned on, or vice versa. In one aspect, the controller 1311 is configured to stagger a starting of the stage one compressor 150 and the stage one compressor 150A to, for example, avoid a combined electrical surge of the compressors 150, 150A.
As may be realized, the heat recovery assembly/system 100 described herein is adapted to attach to or otherwise interface with any suitable furnace having any age or configuration. In one aspect the assembly 100 may be attached to a furnace with about 78% AFUE or higher efficiency, resulting in an increased efficiency of the system. Carbon discharge, exhaust gas temperature, and humidity may also be reduced if the assembly 100 is employed with a furnace.
Still referring to
Referring next to
The system 200 may include a second heat exchanger 130, which includes heat exchange element 130A, in fluid communication with the fluid circuit 120 and disposed in thermal communication with an airstream being drawn into the furnace for heating (see INDOOR AIR passing through the second heat exchanger 130 in
The system 200 may include a drain 111 exiting the heat recovery chamber 110. The drain 111 may be substantially similar to that described above and structured as, for example, in
The system 200 may also include any suitable compressor 150 that may be substantially similar to that previously described herein. In one aspect the compressor may be a micro-compressor to aid in energy conservation. In another aspect a furnace inducer blower, IB, may be in connection with the furnace exhaust 2100 to actively draw exhaust from the furnace 2000 into the exhaust gas intake 114 of the heat recovery chamber 110.
The assembly 100 and system 200 of the disclosed embodiment may further include a heat recovery ventilator. Heat recovery ventilators have been a known art in the HVAC industry for many years: however, the typical ventilator is much less efficient and structurally different than the aspects of the disclosed embodiment in combination with the assembly and system herein. A conventional Heat Recovery Ventilator (HRV) draws in fresh outdoor air to replace exhausted indoor air. The HRV helps create air exchanges within home or building structures which in turn helps to reduce pollutants, smoke, contaminants, airborne allergies, viruses, etc. from collecting within the home or building ventilation systems. During the air exchange process of a ventilator, fans and heat exchangers will pass heated or cooled indoor air over unconditioned outdoor air. The two air masses never combine but are separated by heat exchangers. This process can transfer as much as 85% of the heat energy from the conditioned air mass to the unconditioned air mass. About 15% of the energy is lost in this process, causing the home or building owner the expense of heating or air conditioning that loss to the newly introduced unconditioned air in order to maintain the same comfort level within the structure.
Referring to
In one aspect the heat recovery system 100, 200, 200′ may substantially be a modular unit that can be connected to, for example, furnace 2000 having a common housing 200HA (such as that shown in
Referring to
Referring to
Any suitable sensor(s) 1310 may be may be provided for sensing a pressure (or other suitable physical characteristic of the gas within the heat recovery chamber) for determining a pressure within the heat recovery chamber 110. The sensor(s) 1310 may be connected to any suitable controller 1311 (which may include one or more features described above with respect to
In another aspect, still referring to
In other aspects the sensor(s) 1310 may be configured to detect a pressure of the refrigerant within the first heat exchanger 116 and/or a temperature of the first heat exchanger 116 for determining the presence of frost on the first heat exchanger. For example, a compressor 150 may be provided to at least partly effect the flow of refrigerant through the conduit circuit 120 as described above. The sensor(s) 1310 may be configured to send signals to, for example, controller 1311 indicating a decrease in pressure and/or temperature within the first heat exchanger at which frost may form. The controller may be configured to, based on the sensor signals, turn off the compressor 150 so that the temperature and pressure of the first heat exchanger 116 rise to allow dissipation of the frost. The controller 1311 may be configured to use the sensor data (in e.g. in a closed loop feedback system) for setting, compressor 150 on/off times where the compressor on/off times may be adjusted by the controller in predetermined time increments.
Referring now to
Referring to
As can be seen in
Referring to
Referring to
As may be realized, in one aspect, the heat transferred to the second heat exchanger 130 from the first heat exchanger 116 (whether the system is employed with a furnace or boiler) is used to heat any suitable heat sink or heat transfer medium. Referring to
In one aspect the disclosed embodiment is directed to a method of recovering heat and energy from fuel combustion. The method includes feeding excess heat and exhaust gas emitted as a result of fuel combustion into a heat recovery chamber 110 which contains a first heat exchanger 116 (fluid filled) coupled with a fluid containing conduit circuit(s) 120, 120A. Typically, the fluid comprises a refrigerant. The method further includes feeding cooling gas into the heat recovery chamber so that the cooling gas is mixed with the exhaust gas to produce a mixed gas with potential energy. The method may also include effectuating heat energy exchange through the mixed gas and excess heat interacting with the first heat exchanger 116. As a result, the temperature and pressure within the first heat exchanger 116 and fluid containing conduit circuit(s) 120, 120A rises. The method may also include releasing the heat energy by, for example, forced (or any other flow of) air blowing over a second heat exchanger 117 that is in fluid communication with one fluid containing conduit circuit(s) 120, 120A exterior to the heat recovery chamber.
In accordance with one or more aspects of the disclosed embodiment a heat recovery system in a habitat to be heated by a furnace having a controller coupled to a thermostat, the heat recovery system includes a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake is configured for receiving exhaust gas emitted as a result of fuel combustion in the furnace and the chamber exhaust is configured to discharge emissions from the chamber; a heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit to effect heat exchange between the heat extraction exchanger and an airstream running therethrough; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, the furnace is repeatedly cycled between on and off states when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
It accordance with one or more aspects of the disclosed embodiment the heat recovery system further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
In accordance with one or more aspects of the disclosed embodiment the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
In accordance with one or more aspects of the disclosed embodiment the cooling intake is communicably coupled to the chamber exhaust and is configured to extract at least a portion of the emissions for recirculation as the cooling gas.
In accordance with one or more aspects of the disclosed embodiment the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least: a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
In accordance with one or more aspects of the disclosed embodiment each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
In accordance with one or more aspects of the disclosed embodiment the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
In accordance with one or more aspects of the disclosed embodiment the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
In accordance with one or more aspects of the disclosed embodiment a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
In accordance with one or more aspects of the disclosed embodiment, the heat recovery system is configured to be combined with a heating furnace to effects the coupling of a PVC exhaust duct to the combination of the heat recovery assembly/system 100 and the furnace 2000.
In accordance with one or more aspects of the disclosed embodiment a heat recovery system includes a furnace having a furnace exhaust, a return plenum and a controller coupled to a thermostat; a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake being communicably coupled to the furnace exhaust so that exhaust gas emitted as a result of fuel combustion in the furnace is transferred to the chamber, the chamber exhaust is configured to discharge emissions from the chamber, and the cooling intake is configured to effect transfer of at least a portion of the emissions from the chamber exhaust to the chamber as cooling gas; a heat recovery exchanger disposed within the chamber for contacting a mixture of the cooling gas and the exhaust gas such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit and in thermal communication with an airstream running through the return plenum for transferring heat from the heat extraction exchanger to the airstream; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, the furnace is repeatedly cycled between on and off states throughout the heat call when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
In accordance with one or more aspects of the disclosed embodiment the heat recovery system further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
In accordance with one or more aspects of the disclosed embodiment the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
In accordance with one or more aspects, of the disclosed embedment the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least: a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coucoupled to each other through a secondary fluid circuit of the at least one fluid circuit.
In accordance with one or more aspects of the disclosed embodiment each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
In accordance with one or more aspects of the disclosed embodiment the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
In accordance with one or more aspects of the disclosed embodiment the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
In accordance with one or more aspects of the disclosed embodiment a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
In accordance with one or more aspects of the disclosed embodiment the chamber exhaust comprises a PVC duct.
In accordance with one or more aspects of the disclosed embodiment a heating furnace includes a furnace exhaust; a return plenum; a controller coupled to a thermostat; and a heat recovery system including a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake being communicably coupled to the furnace exhaust so that exhaust gas emitted as a result of fuel combustion in the furnace is transferred to the chamber, the chamber exhaust is configured to discharge emissions from the chamber, and the cooling intake is configured to effect transfer of at least a portion of the emissions from the chamber exhaust to the chamber as cooling gas; a heat recovery exchanger disposed within the chamber for contacting a mixture of the cooling gas and the exhaust gas such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit and in thermal communication with an airstream running through the return plenum for transferring heat from the heat extraction exchanger to the airstream; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, the furnace is repeatedly cycled, for a duration of the heat call, between on and off states when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
In accordance with one or more aspects of the disclosed embodiment the heating furnace further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
In accordance with one or more aspects of the disclosed embodiment the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
In accordance with one or more aspects of the disclosed embodiment the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
In accordance with one or more aspects of the disclosed embodiment each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
In accordance with one or more aspects of the disclosed embodiment the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
In accordance with one or more aspects of the disclosed embodiment the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
In accordance with one or more aspects of the disclosed embodiment a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
In accordance with one or more aspects of the disclosed embodiment a heat recovery system, in a habitat to be heated by a furnace having a controller coupled to a thermostat, includes a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake is configured for receiving exhaust gas emitted as a result of fuel combustion in the furnace and the chamber exhaust is configured to discharge emissions from the chamber; a multiple stage heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected, the multiple stage heat recovery exchanger including at least a first stage and a second stage; at least one fluid circuit in communication with the heat recovery exchanger; a multiple stage heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit to effect heat exchange between the heat extraction exchanger and an airstream running therethrough, the multiple stage heat extraction exchanger having at least a first stage and a second stage; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, one or more of the first and second stages of the multiple stage heat recovery exchanger and the multiple stage heat extraction exchanger are operative during the furnace on state, the first stages of the multiple stage heat recovery exchanger and the multiple stage heat extraction exchanger are operative during the furnace on state, and the second stages of the multiple stage heat recovery exchanger and the multiple stage heat extraction exchanger are inoperative during the furnace off state.
In accordance with one or more aspects of the disclosed embodiment the heat recovery system further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
In accordance with one or more aspects of the disclosed embodiment the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
In accordance with one or more aspects of the disclosed embodiment the cooling intake is communicably coupled to the chamber exhaust and is configured to extract at least a portion of the emissions for recirculation as the cooling gas.
In accordance with one or more aspects of the disclosed embodiment the controller is configured so that in response to a heat call from the thermostat the furnace is repeatedly cycled between on and off states when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
In accordance with one or more aspects of the disclosed embodiment the chamber exhaust comprises a PVC duct.
In accordance with one or more aspects of the disclosed embodiment a heat recovery system, in a habitat to be heated by a furnace having a controller coupled to a thermostat, includes a chamber including an emissions intake, a chamber exhaust and a closed loop cooling intake communicably coupling the chamber exhaust and the chamber, the emissions intake is configured for receiving exhaust gas emitted as a result of fuel combustion in the furnace, the chamber exhaust is configured to discharge emissions from the chamber and the cooling intake is configured to recirculate at least a portion of the emissions from the chamber exhaust to the chamber; a heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit to effect heat exchange between the heat extraction exchanger and an airstream running therethrough; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, the furnace is repeatedly cycled between on and off states when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
In accordance with one or more aspects of the disclosed embodiment the heat recovery system further includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
In accordance with one or more aspects of the disclosed embodiment the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least: a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
In accordance with one or more aspects of the disclosed embodiment each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
In accordance with one or more aspects of the disclosed embodiment the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
In accordance with one or more aspects of the disclosed embodiment the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
In accordance with one more aspects of the disclosed embodiment the chamber exhaust comprises a PVC duct.
In accordance with one or more aspects of the disclosed embodiment a method for recovering heat in a habitat heated by a furnace includes providing a chamber including a cooling intake, an emissions intake and a chamber exhaust, where the emissions intake receives exhaust gas emitted as a result of fuel combustion in the furnace and the chamber exhaust discharges emissions from the chamber; providing a heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected; providing a heat extraction exchanger in fluid communication with the heat recovery exchanger through at least one fluid circuit for effecting heat exchange between the heat extraction exchanger and an airstream running therethrough; providing a temperature sensor in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; and repeatedly cycling the furnace, with a controller that, in response to a heat call from a thermostat, repeatedly cycles the furnace between on and off states for a duration of the heat call when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
In accordance with one or more aspects of the disclosed embodiment the method further includes regulating a pressure within the chamber with fan communicably coupled to the chamber exhaust where the emissions are drawn from the chamber.
In accordance with one or more aspects the disclosed embodiment the method further includes supplying cooling gas in a closed loop from the chamber exhaust to the cooling intake.
In accordance with one or more aspects of the disclosed embodiment the heat recovery exchanger and the heat extraction exchanger are provided as a multi-stage heat exchange system including at least; a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
In accordance with one or more aspects off the disclosed embodiment the method further includes effecting heat exchange during both furnace on and off states with the first stage of the multi-stage heat exchange system.
In accordance with one or more aspects of the disclosed embodiment method further includes effecting heat exchange during furnace on states with the second stage of the multi-stage heat exchange system.
In accordance with one or more aspects of the disclosed embodiment a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
Referring to
The system also includes at least one sensor 204 configured to collect at least one environmental measurement and system-related data. The environment measurement and the system related data includes internal and external temperature and pressure humidity, barometric pressures, dew points, wind direction, sun peak and angle, annual precipitation, geographical location and, elevation of the system, thermostats settings, chemical analysis at specific point of the system carbon dioxide level, motion level, fuel consumption, electrical consumption, fuel price, and electrical energy prices in real time.
The system further includes a central thermal recovery unit 206 in signal communication with the at least one controller 202 and the at least one sensor 204. The central thermal recovery unit 206 is configured for determining an operating instruction based on the at least one environmental measurement and system-related data received from the at least one sensor. The central thermal recovery unit 206 is further configured to transmit the operating instruction to the at least one controller 204. The operating instruction includes a specific operation sequence of a series of operating components/zones controlled by the at least one controller.
The central thermal recovery unit 206 can also be configured to determine operating instruction based on environment measurements and system related data retrieved from a third party database 208. For example, the third party database 208 can include information such as weather conditions, user preferred comfort level, fuel cost, air quality, and the like. The information can facilitate the central thermal recovery unit 206 to determine the operating instruction that improves efficiency and extends the life of the equipment and components of the system.
The at least one controller 202 and/or the at least one sensor 204 can also be used to detect potential issues concerning certain mechanical part and/or zones of the system and transmit these issues to the central thermal recovery unit 206. For example, the at least one controller 202 and/or the at least one sensor 204 can detect a depleted refrigerant and/or leaks at a specific location within the system. The central thermal recovery unit 206 can in turn determine parts in need of repair or replacement and repair or replacement sequences.
The central thermal recovery unit 206 can be configured to determine the operating instructions (e.g., temporal operating sequence) using an adaptive learning method. For example, the central thermal recovery unit 206 can record and analyze operation patterns, compare the efficiencies of each operation pattern, and on this basis predict the most efficient sequence under certain environmental/system conditions. The adaptive learning method will make the heat recovery system more efficient from the continuous determination and implementation of a more efficient operation pattern. The central thermal recovery unit 206 will enable a conventional HVAC system to achieve dramatically higher efficiency levels. As an example, the operation pattern can include motor running time, internal and external temperatures and pressures, fuel combustion rate, fan speed and durations, inducer flow level, blower pressures and speed, ignition timing, and the like. The operation patterns that result in high efficiency can then be transmitted and shared with other thermal recovery units via a network.
The central thermal recovery unit 206 can be configured to achieve the highest system efficiency under given conditions. For example, if the price of fuel depends on the time of day, the central thermal recovery unit can account for fuel price to calculate system efficiency. As another example, for a system that can operate on certain cycles of either refrigeration or fossil fuels, if electric prices are more advantageous than natural gas at a certain time of the day, the system can favor operational cycles that use electricity over natural gas at that time of the day.
The central thermal recovery unit 206 can also be configured to achieve a balance between high system efficiency and low thermal pollutant release. For example, for a heat recovery system located in certain valleys in certain states, for instance, Simi Valley, Calif., the release of a certain pollutant will contribute to smog accumulation. In such cases, the system can be configured to monitor the release of CO/CO2 and other system waste products and to balance energy consumption, system efficiency and materials release accordingly.
As an example, given an outdoor temperature of 40° F., when a call for heat from a thermostat is received, the central thermal recovery unit 206 will first instruct a controller 202 to open one or more dampers to draft in external air for beat extraction from a heat pump. This step will allow the system to deliver a desired amount of heat without the need for a fossil fuel burn. If the first step does not achieve the thermostat setting within a defined period of time, the central thermal recovery unit 206 will instruct one or more dampers to be closed and a combustion chamber to be activated to begin generating thermal energy by burning a fuel. When the thermostat setting is achieved, information such as temperature in the return duct flow, exterior temperature, humidity, dew points, fuel consumption, run time, and the like will be measured, logged and transmitted to the central thermal recovery unit 206 and/or a data collection center. These data are then analyzed to determine, for example, the time period needed to activate a combustion chamber to achieve a desired temperature setting. The central thermal recovery unit 206 can compare present operating conditions with previous operating cycles under similar operating conditions and determine an operating sequence to activate and/or deactivate certain operating components of the system.
As another example, when a call for heat from a thermostat received, the central thermal recovery unit 206 will determine the outdoor temperature and humidity, internal and external system condition, combustion chamber condition to determine the starting time and duration burn cycles and inducer drafting cycles to achieve maximum efficiency of the system.
As another example, for a refrigeration system, the central thermal recovery unit 206 can programmed to collect operating data and environment data of the system on a periodic basis and respond with operation instructions. The operating instructions can include a sequence and duration for operating a compressor, an evaporator, a condenser and a pressure device. Slight changes in the operating times and pressures of specific components will increase the efficiency of heat transfer and decrease the stress on system components. Subtle changes in the operation of each component under specific internal and external conditions can lead to significant improvements in the ability of the system to extract and transfer thermal energy.
The central thermal recovery unit 206 can also be in signal transmission with one or more personal devices 210, a display terminal 212, a user interface 214 (e.g., a website), and the like, for receiving and/or displaying system operation parameters, climate conditions, and/or user preferences. The thermal recovery unit 206 operate at different locations and environmental conditions can continuously transmit data to and receive data from the user interface 214 (e.g., a website). The data input from various central thermal recovery units 206 are displayed on the user interface (e.g., a website) and updated periodically. As a result, the central thermal recovery units 206 installed throughout the world can become more and more efficient by learning operating parameters from other thermal recovery units.
The central thermal recovery unit 206 is configured to communicate the personal devices 210, the display terminal 212 and/or a user interface 214 via a network 216 using a variety of transmission paths, including wireless links such as radio frequency, satellite, Bluetooth and/or physical links such as fiber optic cable, coaxial cable, Ethernet cable, and the like.
Referring to
It should be understood that the foregoing description is only illustrative of the aspects of the disclosed embodiment. Various alternatives and modifications can be devised by those skilled in the art without departing from the aspects of the disclosed embodiment. Accordingly, the aspects of the disclosed embodiment are intended to embrace all such alternatives, modifications and variances that fall within the scope of the appended claims. Further, the mere fact that different features are recited in mutually different dependent or independent claims does not indicate that a combination of these features cannot be advantageously used, such a combination remaining within the scope of the aspects of the invention.
This application is a continuation-in-part of U.S. patent application Ser. No. 14/029,011 filed Sep. 17, 2013 which is a continuation of U.S. patent application Ser. No. 13/753,585 filed Jan. 30, 2013, the disclosures of which applications are incorporated herein by reference in their entirety.
Number | Date | Country | |
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Parent | 13753585 | Jan 2013 | US |
Child | 14029011 | US |
Number | Date | Country | |
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Parent | 14029011 | Sep 2013 | US |
Child | 15417509 | US |