This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present disclosure, which are described below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present disclosure. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art.
HVAC systems are utilized in residential, commercial, and industrial environments to control environmental properties, such as temperature and humidity, for occupants of the respective environments. The HVAC system may control the environmental properties through the control of an air flow delivered to the conditioned environment. For example, the HVAC system may include a condenser used to cool and condense a gaseous refrigerant. The gaseous refrigerant may be routed through condenser coils of the condenser, and an air flow over the condenser coils may extract heat from the gaseous refrigerant passing through the condenser coils, thereby converting the gaseous refrigerant to a liquid state. Unfortunately, traditional condensers may include coil arrangements that are inefficient for heat exchange.
A summary of certain embodiments disclosed herein is set forth below. It should be understood that these aspects are presented merely to provide the reader with a brief summary of these certain embodiments and that these aspects are not intended to limit the scope of this disclosure. Indeed, this disclosure may encompass a variety of aspects that may not be set forth below.
The present disclosure relates to a heating, ventilation, and/or air conditioning (HVAC) system that includes an air flow path through which an air flow is routed. The HVAC system also includes a first condenser coil positioned in the air flow path and configured to receive a first portion of a refrigerant from a refrigerant conduit. The HVAC system also includes a second condenser coil positioned in the air flow path downstream from the first condenser coil relative to the air flow, and configured to receive a second portion of the refrigerant from the refrigerant conduit in parallel with the first portion of the refrigerant received by the first condenser coil.
The present disclosure also relates to a condenser that includes a first condenser coil configured to receive a first portion of a refrigerant from a main refrigerant circuit, and a second condenser coil configured to receive a second portion of the refrigerant from the main refrigerant circuit in parallel with the first portion of the refrigerant received by the first condenser coil from the main refrigerant circuit. The second condenser coil is disposed downstream from the first condenser coil relative to a direction of an air flow across the condenser.
The present disclosure also relates to a condenser that includes a first condenser coil configured to receive a first portion of a refrigerant from a refrigerant conduit, and a second condenser coil configured to receive a second portion of the refrigerant from the refrigerant conduit in parallel with the first portion of the refrigerant received by the first condenser coil. The first condenser coil includes a first coil length and the second condenser coil includes a second coil length, and wherein the second coil length is between 1% and 50% of the first coil length.
One or more specific embodiments of the present disclosure will be described below. These described embodiments are only examples of the presently disclosed techniques. Additionally, in an effort to provide a concise description of these embodiments, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
When introducing elements of various embodiments of the present disclosure, the articles “a,” “an,” and “the” are intended to mean that there are one or more of the elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. Additionally, it should be understood that references to “one embodiment” or “an embodiment” of the present disclosure are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features.
As briefly discussed above, a heating, ventilation, and/or air conditioning (HVAC) system may include a condenser having a coil arrangement in which a first condenser coil is positioned in an air flow path, and a second condenser coil is positioned in the air flow path downstream from the first condenser coil relative to the air flow path. In one such embodiment, the first condenser coil may be configured to receive a first portion of a refrigerant from a refrigerant conduit, and the second condenser coil may be configured to receive a second portion of the refrigerant from the refrigerant conduit in parallel with the first portion of the refrigerant received by the first condenser coil. The first condenser coil may be a two-pass condenser coil, and the second condenser coil may be sized to align with one of the passes of the first condenser coil, such as the second pass. For example, the first pass of the first condenser coil generally may be utilized to desuperheat and condense the first portion of the refrigerant, and the second pass of the first condenser coil generally may be utilized to subcool the first portion of the refrigerant. The portion of the air flow over the first pass may receive more heat than the portion of the air flow over the second pass. By positioning and sizing the second condenser coil to align with the second pass of the first condenser coil, the second portion of the refrigerant passing through the second condenser coil may extract additional heat from the portion of the air flow that passed over the second pass of the first condenser coil, thereby improving efficiency of the condenser and causing more uniform heat distribution through the air flow passing over the condenser. Other condenser coil arrangements are also disclosed for improving efficiency of the condenser and causing more uniform heat distribution through the air flow passing over the condenser, and will be described in detail below.
Turning now to the drawings,
In the illustrated embodiment, a building 10 is air conditioned by a system that includes an HVAC unit 12. The building 10 may be a commercial structure or a residential structure. As shown, the HVAC unit 12 is disposed on the roof of the building 10; however, the HVAC unit 12 may be located in other equipment rooms or areas adjacent the building 10. The HVAC unit 12 may be a single package unit containing other equipment, such as a blower, integrated air handler, and/or auxiliary heating unit. In other embodiments, the HVAC unit 12 may be part of a split HVAC system, such as the system shown in
The HVAC unit 12 is an air cooled device that implements a refrigeration cycle to provide conditioned air to the building 10. Specifically, the HVAC unit 12 may include one or more heat exchangers across which an air flow is passed to condition the air flow before the air flow is supplied to the building. In the illustrated embodiment, the HVAC unit 12 is a rooftop unit (RTU) that conditions a supply air stream, such as environmental air and/or a return air flow from the building 10. After the HVAC unit 12 conditions the air, the air is supplied to the building 10 via ductwork 14 extending throughout the building 10 from the HVAC unit 12. For example, the ductwork 14 may extend to various individual floors or other sections of the building 10. In certain embodiments, the HVAC unit 12 may be a heat pump that provides both heating and cooling to the building with one refrigeration circuit configured to operate in different modes. In other embodiments, the HVAC unit 12 may include one or more refrigeration circuits for cooling an air stream and a furnace for heating the air stream.
A control device 16, one type of which may be a thermostat, may be used to designate the temperature of the conditioned air. The control device 16 also may be used to control the flow of air through the ductwork 14. For example, the control device 16 may be used to regulate operation of one or more components of the HVAC unit 12 or other components, such as dampers and fans, within the building 10 that may control flow of air through and/or from the ductwork 14. In some embodiments, other devices may be included in the system, such as pressure and/or temperature transducers or switches that sense the temperatures and pressures of the supply air, return air, and so forth. Moreover, the control device 16 may include computer systems that are integrated with or separate from other building control or monitoring systems, and even systems that are remote from the building 10.
As shown in the illustrated embodiment of
The HVAC unit 12 includes heat exchangers 28 and 30 in fluid communication with one or more refrigeration circuits. Tubes within the heat exchangers 28 and 30 may circulate refrigerant, such as R-410A, through the heat exchangers 28 and 30. The tubes may be of various types, such as multichannel tubes, conventional copper or aluminum tubing, and so forth. Together, the heat exchangers 28 and 30 may implement a thermal cycle in which the refrigerant undergoes phase changes and/or temperature changes as it flows through the heat exchangers 28 and 30 to produce heated and/or cooled air. For example, the heat exchanger 28 may function as a condenser where heat is released from the refrigerant to ambient air, and the heat exchanger 30 may function as an evaporator where the refrigerant absorbs heat to cool an air stream. In other embodiments, the HVAC unit 12 may operate in a heat pump mode where the roles of the heat exchangers 28 and 30 may be reversed. That is, the heat exchanger 28 may function as an evaporator and the heat exchanger 30 may function as a condenser. In further embodiments, the HVAC unit 12 may include a furnace for heating the air stream that is supplied to the building 10. While the illustrated embodiment of
The heat exchanger 30 is located within a compartment 31 that separates the heat exchanger 30 from the heat exchanger 28. Fans 32 draw air from the environment through the heat exchanger 28. Air may be heated and/or cooled as the air flows through the heat exchanger 28 before being released back to the environment surrounding the HVAC unit 12. A blower assembly 34, powered by a motor 36, draws air through the heat exchanger 30 to heat or cool the air. The heated or cooled air may be directed to the building 10 by the ductwork 14, which may be connected to the HVAC unit 12. Before flowing through the heat exchanger 30, the conditioned air flows through one or more filters 38 that may remove particulates and contaminants from the air. In certain embodiments, the filters 38 may be disposed on the air intake side of the heat exchanger 30 to prevent contaminants from contacting the heat exchanger 30.
The HVAC unit 12 also may include other equipment for implementing the thermal cycle. Compressors 42 increase the pressure and temperature of the refrigerant before the refrigerant enters the heat exchanger 28. The compressors 42 may be any suitable type of compressors, such as scroll compressors, rotary compressors, screw compressors, or reciprocating compressors. In some embodiments, the compressors 42 may include a pair of hermetic direct drive compressors arranged in a dual stage configuration 44. However, in other embodiments, any number of the compressors 42 may be provided to achieve various stages of heating and/or cooling. As may be appreciated, additional equipment and devices may be included in the HVAC unit 12, such as a solid-core filter drier, a drain pan, a disconnect switch, an economizer, pressure switches, phase monitors, and humidity sensors, among other things.
The HVAC unit 12 may receive power through a terminal block 46. For example, a high voltage power source may be connected to the terminal block 46 to power the equipment. The operation of the HVAC unit 12 may be governed or regulated by a control board 48. The control board 48 may include control circuitry connected to a thermostat, sensors, and alarms. One or more of these components may be referred to herein separately or collectively as the control device 16. The control circuitry may be configured to control operation of the equipment, provide alarms, and monitor safety switches. Wiring 49 may connect the control board 48 and the terminal block 46 to the equipment of the HVAC unit 12.
When the system shown in
The outdoor unit 58 draws environmental air through the heat exchanger 60 using a fan 64 and expels the air above the outdoor unit 58. When operating as an air conditioner, the air is heated by the heat exchanger 60 within the outdoor unit 58 and exits the unit at a temperature higher than it entered. The indoor unit 56 includes a blower or fan 66 that directs air through or across the indoor heat exchanger 62, where the air is cooled when the system is operating in air conditioning mode. Thereafter, the air is passed through ductwork 68 that directs the air to the residence 52. The overall system operates to maintain a desired temperature as set by a system controller. When the temperature sensed inside the residence 52 is higher than the set point on the thermostat, or a set point plus a small amount, the residential heating and cooling system 50 may become operative to refrigerate additional air for circulation through the residence 52. When the temperature reaches the set point, or a set point minus a small amount, the residential heating and cooling system 50 may stop the refrigeration cycle temporarily.
The residential heating and cooling system 50 may also operate as a heat pump. When operating as a heat pump, the roles of heat exchangers 60 and 62 are reversed. That is, the heat exchanger 60 of the outdoor unit 58 will serve as an evaporator to evaporate refrigerant and thereby cool air entering the outdoor unit 58 as the air passes over outdoor the heat exchanger 60. The indoor heat exchanger 62 will receive a stream of air blown over it and will heat the air by condensing the refrigerant.
In some embodiments, the indoor unit 56 may include a furnace system 70. For example, the indoor unit 56 may include the furnace system 70 when the residential heating and cooling system 50 is not configured to operate as a heat pump. The furnace system 70 may include a burner assembly and heat exchanger, among other components, inside the indoor unit 56. Fuel is provided to the burner assembly of the furnace system 70 where it is mixed with air and combusted to form combustion products. The combustion products may pass through tubes or piping in a heat exchanger, separate from heat exchanger 62, such that air directed by the blower 66 passes over the tubes or pipes and extracts heat from the combustion products. The heated air may then be routed from the furnace system 70 to the ductwork 68 for heating the residence 52.
In some embodiments, the vapor compression system 72 may use one or more of a variable speed drive (VSDs) 92, a motor 94, the compressor 74, the condenser 76, the expansion valve or device 78, and/or the evaporator 80. The motor 94 may drive the compressor 74 and may be powered by the variable speed drive (VSD) 92. The VSD 92 receives alternating current (AC) power having a particular fixed line voltage and fixed line frequency from an AC power source, and provides power having a variable voltage and frequency to the motor 94. In other embodiments, the motor 94 may be powered directly from an AC or direct current (DC) power source. The motor 94 may include any type of electric motor that can be powered by a VSD or directly from an AC or DC power source, such as a switched reluctance motor, an induction motor, an electronically commutated permanent magnet motor, or another suitable motor.
The compressor 74 compresses a refrigerant vapor and delivers the vapor to the condenser 76 through a discharge passage. In some embodiments, the compressor 74 may be a centrifugal compressor. The refrigerant vapor delivered by the compressor 74 to the condenser 76 may transfer heat to a fluid passing across the condenser 76, such as ambient or environmental air 96. The refrigerant vapor may condense to a refrigerant liquid in the condenser 76 as a result of thermal heat transfer with the environmental air 96. The liquid refrigerant from the condenser 76 may flow through the expansion device 78 to the evaporator 80.
The liquid refrigerant delivered to the evaporator 80 may absorb heat from another air stream, such as a supply air stream 98 provided to the building 10 or the residence 52. For example, the supply air stream 98 may include ambient or environmental air, return air from a building, or a combination of the two. The liquid refrigerant in the evaporator 80 may undergo a phase change from the liquid refrigerant to a refrigerant vapor. In this manner, the evaporator 80 may reduce the temperature of the supply air stream 98 via thermal heat transfer with the refrigerant. Thereafter, the vapor refrigerant exits the evaporator 80 and returns to the compressor 74 by a suction line to complete the cycle.
In some embodiments, the vapor compression system 72 may further include a reheat coil in addition to the evaporator 80. For example, the reheat coil may be positioned downstream of the evaporator relative to the supply air stream 98 and may reheat the supply air stream 98 when the supply air stream 98 is overcooled to remove humidity from the supply air stream 98 before the supply air stream 98 is directed to the building 10 or the residence 52.
It should be appreciated that any of the features described herein may be incorporated with the HVAC unit 12, the residential heating and cooling system 50, or other HVAC systems. Additionally, while the features disclosed herein are described in the context of embodiments that directly heat and cool a supply air stream provided to a building or other load, embodiments of the present disclosure may be applicable to other HVAC systems as well. For example, the features described herein may be applied to mechanical cooling systems, free cooling systems, chiller systems, or other heat pump or refrigeration applications.
Further, any of the preceding embodiments illustrated in
In one embodiment, the first condenser coil of the condenser (such as heat exchanger 28, 30, 60, or 76 in
With the foregoing in mind,
In the illustrated embodiment, the condenser 100 includes a first condenser coil 102 and a second condenser coil 104 disposed downstream from the first condenser coil 102 with respect to an air flow 105 through the condenser 100. The first condenser coil 102 may include an inlet/outlet header 106, a first refrigerant pass 108, a transfer header 110, and a second refrigerant pass 112 in counter-flow with the first refrigerant pass 108.
The inlet/outlet header 106 may receive a first refrigerant portion 114 from a refrigerant feed-line 116 that feeds refrigerant to the condenser 100 from, for example, a compressor (not shown). After receiving the first refrigerant portion 114 from the refrigerant feed-line 116, the inlet/outlet header 106 may distribute the first refrigerant portion 114 to multiple condenser tubes forming the first refrigerant pass 108. The multiple condenser tubes are schematic in the illustrated embodiment and may include singular tubes, multi-channel tubes, or any other suitable condenser tubes. The transfer header 110 may receive the first refrigerant portion 114 from the first refrigerant pass 108 and may transfer, or distribute, the first refrigerant portion 114 from the first refrigerant pass 108 of the first condenser coil 102 to multiple condenser tubes of the second refrigerant pass 112 of the first condenser coil 102. The multiple condenser tubes are schematic in the illustrated embodiment and may include singular tubes, multi-channel tubes, or any other suitable condenser tubes. The first refrigerant portion 114 may then be received by the inlet/outlet header 106 and output to a refrigerant output line 118. A baffle 120 may be disposed in the inlet/outlet header 106 to separate an inlet portion of the inlet/outlet header 106, or the portion of the inlet/outlet header 106 receiving the first refrigerant portion 114 from the refrigerant feed-line 116, from the outlet portion of the inlet/outlet header 106, or the portion of the inlet/outlet header 106 outputting the first refrigerant portion 114 from the inlet/outlet header 106 to the refrigerant output line 118. In certain embodiments, the first refrigerant pass 108 of the first condenser coil 102 may be generally utilized to desuperheat and condense the first refrigerant portion 114, whereas the second refrigerant pass 112 of the first condenser coil 102 may be generally utilized to subcool the first refrigerant portion 114. Because of these differences between the first refrigerant pass 108 and the second refrigerant pass 112, more heat may be extracted by the portion of the air flow 105 passing over the first refrigerant pass 108 than over the second refrigerant pass 112.
In accordance with present embodiments, the second condenser coil 104 may be positioned downstream from the first condenser coil 102 relative to an air flow direction of the air flow 105. That is, the second condenser coil 104 may be disposed in series with the first condenser coil 102 with respect to the air flow 105. Thus, the air flow 105 may pass over the first condenser coil 102, and then may pass over the second condenser coil 104. The first condenser coil 102 and the second condenser coil 104 are illustrated in a spaced arrangement due to the exploded perspective view, but it should be appreciated that the first condenser coil 102 and the second condenser coil 104 may contact each other and/or may be positioned immediately adjacent to each other.
The second condenser coil 104 in the illustrated embodiment includes an inlet/outlet header 126, a first refrigerant pass 128, a transfer header 130, and a second refrigerant pass 132 in counter-flow with the first refrigerant pass 128. The inlet/outlet header 126 of the second condenser coil 104 may receive a second refrigerant portion 134 from the refrigerant feed-line 116 in parallel with the first refrigerant portion 114 received by the first condenser coil 102 from the refrigerant feed-line 116. That is, while the second condenser coil 104 is disposed downstream from the first condenser coil 102 with respect to the air flow 105, the second condenser coil 104 and the first condenser coil 102 are disposed in parallel with each other relative to the refrigerant input from the refrigerant feed-line 116.
After receiving the second refrigerant portion 134 from the refrigerant feed-line 116, the inlet/outlet header 126 of the second condenser coil 104 may distribute the second refrigerant portion 134 to multiple condenser tubes forming the first refrigerant pass 128 of the second condenser coil 104. The multiple condenser tubes are schematic in the illustrated embodiment and may include singular tubes, multi-channel tubes, or any other suitable condenser tubes. The transfer header 130 may receive the second refrigerant portion 134 from the first refrigerant pass 128 of the second condenser coil 104 and may transfer, or distribute, the second refrigerant portion 134 from the first refrigerant pass 128 of the second condenser coil 104 to multiple condenser tubes of the second refrigerant pass 132 of the second condenser coil 104. The multiple condenser tubes are schematic in the illustrated embodiment and may include singular tubes, multi-channel tubes, or any other suitable condenser tubes. The second refrigerant portion 134 may then be received by the inlet/outlet header 126 and output to the refrigerant output line 118. In the illustrated embodiment, the refrigerant output line 118 combines the first refrigerant portion 114 received from the first condenser coil 102 and the second refrigerant portion 134 received from the second condenser coil 104. A baffle 140 may be disposed in the inlet/outlet header 126 of the second condenser coil 104 to separate an inlet portion of the inlet/outlet header 126, or the portion of the inlet/outlet header 126 receiving the second refrigerant portion 134 from the refrigerant feed-line 116, from the outlet portion of the inlet/outlet header 126, or the portion of the inlet/outlet header 126 outputting the second refrigerant portion 134 from the inlet/outlet header 126 to the refrigerant output line 118. In certain embodiments, the first refrigerant pass 128 of the second condenser coil 104 may be generally utilized to desuperheat and condense the second refrigerant portion 134, whereas the second refrigerant pass 132 of the second condenser coil 104 may be generally utilized to subcool the second refrigerant portion 134.
As shown, the second condenser coil 104 may be sized and arranged to align with the second refrigerant pass 112 of the first condenser coil 102. For example, as shown, a length 150 of the second refrigerant pass 112 of the first condenser coil 102 may be substantially similar to a total length 170 of the second condenser coil 104. Additionally or alternatively, an amount of tubing in the second refrigerant pass 112 of the first condenser coil 102 may be substantially similar to an amount of tubing in the second condenser coil 104. Relative sizing of the first condenser coil 102 and the second condenser coil 104 will be described in detail below with respect to
Each of the condenser coils 102, 104 is a two-pass coil. For example, the first condenser coil 102 includes the first refrigerant pass 108 and the second refrigerant pass 112, and the second condenser coil 104 includes the first refrigerant pass 128 and the second refrigerant pass 132. The first condenser coil 102 includes a total length 160. A length 162 of the first refrigerant pass 108 plus a length 164 of the second refrigerant pass 112 may be substantially similar to the total length 160 of the first condenser coil 102. In some embodiments, the length 162 may be approximately 55%-85% of the length 160, and the length 164 may be approximately 15%-45% of the length 160. In some embodiments, the length 162 may be approximately 60%-80% of the length 160, and the length 164 may be approximately 20%-40% of the length 160. In some embodiments, the length 162 may be approximately 65%-75% of the length 160, and the length 164 may be approximately 25%-35% of the length 160. For example, the length 162 of the first refrigerant pass 108 of the first condenser coil 102 may be approximately 70% of the total length 160 of the first condenser coil 102, and the length 164 of the second refrigerant pass 112 of the first condenser coil 102 may be approximately 30% of the total length 160 of the first condenser coil 102.
It should be noted that the term “length” should not be interpreted to necessarily imply a relative orientation of the first condenser coil 102 with respect to a Gravity vector, but instead is used merely to denote relative sizing of the various components of the first condenser coil 102. Further, in some embodiments, the relative sizing of the first refrigerant pass 108 and the second refrigerant pass 112 may be in terms of amount of tubing or tubing volume. “Amount of tubing” may be used herein to refer to a total distance of tubing if the tubing were laid out in a straight line and without curvature. “Volume of tubing” may be used herein to refer to a total combined volume of refrigerant flow path defined by the tubing. In some embodiments, an amount or volume of tubing of the first refrigerant pass 108 may account for approximately 55%-85% of a total amount or volume of tubing of the first condenser coil 102, and an amount or volume of tubing for the second refrigerant pass 112 may account for approximately 15%-45% of the a total amount or volume of tubing of the first condenser coil 102. In some embodiments, the amount or volume of tubing of the first refrigerant pass 108 may account for approximately 60%-80% of the total amount or volume of the first condenser coil 102, and the amount or volume of tubing of the second refrigerant pass 112 may be approximately 20%-40% of the total amount or volume of tubing of the first condenser coil 102. In some embodiments, the amount or volume of tubing of the first refrigerant pass 108 may account for approximately 75%-65% of the total amount or volume of the first condenser coil 102, and the amount or volume of tubing of the second refrigerant pass 112 may be approximately 25%-35% of the total amount or volume of tubing of the first condenser coil 102. For example, the amount or volume of tubing of the first refrigerant pass 108 may account for approximately 70% of the total amount or volume of tubing of the first condenser coil 102, and the amount or volume of tubing of the second refrigerant pass 112 may account for approximately 30% of the total amount or volume of tubing of the first condenser coil 102.
As previously described, the first refrigerant pass 108 of the first condenser coil 102 may be generally utilized to desuperheat and condense the first refrigerant portion 114, and the second refrigerant pass 112 of the first condenser coil 102 may be generally utilized to subcool the first refrigerant portion 114. Because of these differences between the first refrigerant pass 108 and the second refrigerant pass 112, more heat may be extracted by the portion of the air flow 105 passing over the first refrigerant pass 108 than over the second refrigerant pass 112. Thus, in accordance with present embodiments, the second condenser coil 104 of the condenser 100 may be positioned downstream, relative to an air flow direction of the air flow 105, from the first condenser coil 102.
The second condenser coil 104 may include a total length 170 that is substantially similar to the length 164 of the second refrigerant pass 112 of the first condenser coil 102. Thus, based on the relative lengths 162, 164 of the first and second refrigerant passes 108, 112, respectively, of the first condenser coil 102, the total length 170 of the second condenser coil 104 may be, for example, between approximately 1% and 50% of the total length 160 of the first condenser coil 102, or between approximately 1% and 35% of the total length 160 of the first condenser coil 102. In this way, the portion of the air flow 105 passing over or through the second refrigerant pass 112 of the first condenser coil 102 will substantially pass over or through the second condenser coil 104, and the portion of the air flow 105 passing over or through the first refrigerant pass 108 of the first condenser coil 102 will not substantially pass over or through the second condenser coil 104. As noted above, the relative sizing of the second condenser coil 104 relative to aspects of the first condenser coil 102 may be determined in terms of something other than length. For example, the relative sizing of the second condenser coil 104 compared to the second refrigerant pass 112 of the first condenser coil 102 may be in terms of amount or volume of tubing. That is, the amount or volume of tubing of the second refrigerant pass 112 of the first condenser coil 102 may be substantially similar or equal to the total amount or volume of tubing of the second condenser coil 104. Further, the sizing of the second condenser coil 104 and the second refrigerant pass 112 of the first condenser coil 102 may differ slightly in accordance with presently contemplated embodiments. For example, a coil size of the second refrigerant pass 112 of the first condenser coil 102 may be within +/−10% of a total coil size of the second condenser coil 104. In other words, the coil size of the second refrigerant pass 112 of the first condenser coil 102 may be between 90%-110% of the coil size of the second condenser coil 104. “Coil size” may be used herein to refer to any of the above-described coil lengths, volume of tubing, or amount of tubing. “Tubing” and “coil” may be used interchangeably.
By sizing the second condenser coil 104 relative to, or substantially similar to, the second refrigerant pass 112 of the first condenser coil 102, the heat rejection by refrigerant of the corresponding HVAC system to the air flow 105 is improved and may be more efficient than traditional embodiments. Further, heat distribution through the air flow 105 is improved and more uniform than traditional embodiments. It should be noted that the second condenser coil 104 may be a two-pass coil, like the first condenser coil 102, and that relative lengths 172, 174 of the first refrigerant pass 128 of the second condenser coil 104 and the second refrigerant pass 132 of the second condenser coil 104 may be substantially similar to those described above for the first condenser coil 102.
The second condenser coil 204 in the illustrated embodiment is configured to receive a refrigerant, for example from a compressor, and pass the refrigerant to the first condenser coil 202. That is, the second condenser coil 204 and the first condenser coil 202 are in series relative to a flow of refrigerant. The second condenser coil 204 includes an inlet header 206, a number of coils or tubes 208 arranged in a single pass, and an outlet header 210. The inlet header 206 receives refrigerant 211 from a refrigerant feed-line 212, and passes the refrigerant 211 to the tubes 208 over which the air flow eventually passes. The tubes 208 pass the refrigerant 211 to the outlet header 210, which outputs the refrigerant 211 to a transfer conduit 214. The transfer conduit 214 may pass the refrigerant 211 to an inlet header 216 of the first condenser coil 202, which distributes the refrigerant 211 to a number of coils or tubes 218 arranged in a single pass. The tubes 218 guide the refrigerant 211 to an outlet header 220 of the first condenser coil 202, which outputs the refrigerant 211 to a refrigerant output line 228.
As shown, the first condenser coil 202 receives the air flow 205 prior to the second condenser coil 204 receiving the air flow 205, while the second condenser coil 204 receives the refrigerant 211 prior to the first condenser coil 202 receiving the refrigerant 211. The illustrated coil arrangement enables similar technical benefits noted above with respect to other disclosed embodiments. In particular, the disclosed coil arrangement facilitates improved heat exchange efficiency and more evenly distributes heat or temperature across the air flow 205.
It should be noted that the side of the first condenser coil 202 on which the inlet header 216 and the outlet header 220 are disposed in the illustrated embodiment could be alternated, and/or the side of the second condenser coil 204 on which the inlet header 206 and the output header 210 are disposed could be alternated. Further, the inlet headers 206, 216 may receive the refrigerant 211 on either end, and the outlet headers 210, 220 may output the refrigerant 211 on either end. In some embodiments, a pump 240 or a comparable device may be utilized to move the refrigerant 211 through the various refrigerant flow paths noted above. In the illustrated embodiment, the pump 240 is disposed on the transfer conduit 214, but may be disposed anywhere along the refrigerant flow path.
Technical benefits of disclosed embodiments include improved condenser heat rejection, improved condenser efficiency, and improved air flow temperature uniformity. The above-described coil arrangements of a condenser may be incorporated in a residential, commercial, or industrial environment, having the above-described technical benefits in any such settings.
While only certain features and embodiments have been illustrated and described, many modifications and changes may occur to those skilled in the art, such as variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, such as temperatures and pressures, mounting arrangements, use of materials, colors, orientations, and so forth, without materially departing from the novel teachings and advantages of the subject matter recited in the claims. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the disclosure. Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not have been described, such as those unrelated to the presently contemplated best mode, or those unrelated to enablement. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
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20210164710 A1 | Jun 2021 | US |