Patent Grant
9310112
1. Field of the Invention
The present application relates generally to the field of ventilating, heating, and cooling systems for the creation and distribution of comfort air and the thermal management of sensitive systems for which temperature control is important.
2. Description of the Related Art
Heating and cooling to achieve comfort and to manage the temperature of critical systems and equipment is primarily accomplished through centralized systems. In these systems, hot and cold working fluids are used to provide temperature control for target objects within comparatively large volumes and surrounding structures. The system's capacity must be sized to heat or cool the target objects plus the thermal loads of the surrounding structures, extraneous objects and barrier materials. Heating and cooling of objects other than the targets results in significant energy waste, and slower response time for the system.
Variations of this system configuration involve conveying the working fluids conditioned in the central system to separate areas by means of specific ducts. This approach also suffers from the energy losses described above.
In buildings, centralized heating and cooling systems are used to establish and maintain occupant comfort, and in special cases, the temperature control of sensitive electronic equipment. These systems create and distribute heated and cooled air from a central point. The system is subject to significant losses as only a fraction of the thermal power developed by the central system reaches the target objects as the majority of the thermal capacity is wasted conditioning walls, ducting, ceilings, windows and furniture. Centralized heating and cooling systems with rotating mechanical parts tend to be noisy, and are subject to seal and other mechanical failures. The systems use ozone depleting refrigerants such as R-134A. With the exception of heat pump systems which operate over a narrow temperature range, a separate unit is required for heating.
Building heating and cooling is also provided by smaller, localized units, however such units utilize compressors for cooling which are noisy, vibrate, and utilize mechanical parts subject to failure, use ozone depleting refrigerants, and an additional unit is required for heating. The use of thermoelectric devices for these applications has been limited as they suffer from poor efficiency and use too much thermoelectric material to provide the needed capacity within cost constraints.
In automobiles, air is forced across an evaporator core within a centralized air handler unit to provide cool air to the passenger cabin in hot conditions. The cold air created in the air handler unit is distributed through a series of valves and air ducts to cool passengers. Such a system may supply 3,000 to 4,500 watts of cooled air at a steady state condition, of which the passengers require (and receive) only a small fraction. The majority of the cooled air is spent lowering the temperature of other parts of the cabin including the windows, head liner, seats and flooring. In addition, the cooling devices of such systems use chemicals such as R-134A with a high Green House Gas Index and operate with moving mechanical parts subject to failure.
In heating mode, the air handler unit provides heating through the same distribution system and suffers losses similar to those experienced by A/C systems as the majority of the warmed air is spent heating various elements of the cabin other than the occupants. Also, since waste heat from the engine coolant is used to heat occupants, the response time is slow. This is especially true for small-engine efficient vehicles such as diesels and hybrids. This condition has been recognized and Positive Temperature Coefficient (PTC) heaters are used to supplement engine coolant heating. However, such devices are inefficient.
The Climate Controlled Seat System (CCS™) described by Feher (U.S. Pat. No. 4,923,248, issued May 8, 1990, “Cooling and Heating Seat Pad Construction”), provides a thermoelectric system for distributed heating and cooling by embedding heating and cooling devices within an occupant's seat back and cushion, however it only partially addresses the need for occupant comfort because the human body requires heating and cooling of surfaces not touching the seat and backrest. In addition, the thermal capacity of the device is limited by the use of air as the sole working fluid due to its low heat capacity.
In certain embodiments, a thermoelectric system provides distributed localized heating, cooling, or both heating and cooling. The thermoelectric system comprises at least one fluid conduit configured to allow a first working fluid to flow therein. The thermoelectric system further comprises a plurality of thermoelectric assemblies. Each thermoelectric assembly comprises a plurality of thermoelectric elements, and each thermoelectric assembly is in thermal communication with the first working fluid and in thermal communication with a region corresponding to the thermoelectric assembly. Each thermoelectric assembly is selectively operable either to heat the region corresponding to the thermoelectric assembly by transferring heat from the first working fluid to the region corresponding to the thermoelectric assembly or to cool the region corresponding to the thermoelectric assembly by transferring heat from the region corresponding to the thermoelectric assembly to the first working fluid. Each thermoelectric assembly is operable independently from operation of other thermoelectric assemblies of the plurality of thermoelectric assemblies.
In certain embodiments, at least a portion of the first working fluid flows through the at least one fluid conduit such that the at least a portion of the first working fluid is sequentially in thermal communication with two or more thermoelectric assemblies of the plurality of thermoelectric assemblies. The at least a portion of the first working fluid can be heated by at least one of the thermoelectric assemblies and cooled by at least one of the thermoelectric assemblies. The first working fluid of certain embodiments flows repeatedly through the at least one fluid conduit. In certain embodiments, at least a portion of the first working fluid flows through the at least one fluid conduit such that the at least a portion of the first working fluid is not in thermal communication with two or more thermoelectric assemblies of the plurality of thermoelectric assemblies.
In certain embodiments, each thermoelectric assembly comprises a first side in thermal communication with the first working fluid and a second side in thermal communication with a second working fluid, and is configured to transfer heat between the first side and the second side. In certain embodiments the second working fluid is the same as the first working fluid, while in certain other embodiments, the second working fluid is different from the first working fluid. For example, the first working fluid can be water and the second working fluid can be air. In certain embodiments, at least one of the first working fluid and the second working fluid is a liquid (e.g., water). In certain embodiments, one of the first working fluid and the second working fluid is a liquid (e.g., water), and the other of the first working fluid and the second working fluid is a gas (e.g., air).
In certain embodiments, the thermoelectric system further comprises one or more valves which are adjustable to control flow of the first working fluid in the at least one fluid conduit. In certain such embodiments, the one or more valves are adjustable to place one or more selected thermoelectric assemblies in thermal communication with the first working fluid.
In certain embodiments, the thermoelectric system further comprises a thermal storage reservoir fluidically coupled to the at least one fluid conduit. The thermal storage reservoir is configured to receive the first working fluid. In certain embodiments, the thermal storage reservoir is also configured to store thermal power during peak generation events and to return thermal power to the first working fluid according to need. In certain embodiments, the thermoelectric system further comprises an intermediate heat exchanger in thermal communication with the first working fluid. The intermediate heat exchanger can be in thermal communication with a target object to be cooled or heated.
In certain embodiments, each thermoelectric assembly comprises a first heat exchanger in thermal communication with the first working fluid and a second heat exchanger in thermal communication with a second working fluid. In certain such embodiments, each second heat exchanger cools or heats the second working fluid to cool or heat the region corresponding to the thermoelectric assembly. In certain embodiments, the second working fluid flows from the region corresponding to the thermoelectric assembly to a volume to be cooled or heated. In certain embodiments, the second working fluid comprises a gas and the thermoelectric system further comprises one or more fans which drive the second working fluid from the region corresponding to the thermoelectric assembly to the volume.
In certain embodiments, the first heat exchanger comprises a plurality of fins. In certain embodiments, the second heat exchanger comprises a plurality of fins. In certain embodiments, each thermoelectric assembly comprises a plurality of N-type thermoelectric elements and a plurality of P-type thermoelectric elements, and each thermoelectric assembly further comprises a plurality of electrically conductive and thermally conductive connectors. Each of the connectors is in electrical communication and thermal communication with at least one of the plurality of N-type thermoelectric elements and with at least one of the plurality of P-type thermoelectric elements and in thermal communication with the first heat exchanger or the second heat exchanger. In certain such embodiments, each connector has a first portion and a second portion. The first portion is in thermal communication with the first heat exchanger or the second heat exchanger. The second portion is sandwiched between at least one of the plurality of N-type thermoelectric elements and at least one of the plurality of P-type thermoelectric elements.
In certain embodiments, a network of distributed thermoelectric assemblies is provided. The network comprises a plurality of thermoelectric assemblies. Each thermoelectric assembly has a first side and a second side. Each thermoelectric assembly is selectively operable either to heat a region corresponding to the thermoelectric assembly by transferring heat from a first working fluid to the region corresponding to the thermoelectric assembly or to cool the region corresponding to the thermoelectric assembly by transferring heat from the region corresponding to the thermoelectric assembly to the first working fluid. Each thermoelectric assembly is operable independently from operation of other thermoelectric assemblies of the plurality of thermoelectric assemblies. Each thermoelectric assembly comprises a plurality of thermoelectric elements in thermal communication with the first side and with the second side of the thermoelectric assembly. Each thermoelectric assembly further comprises a first heat exchanger in thermal communication with the first side of the thermoelectric assembly. The first heat exchanger is configured to be in thermal communication with the first working fluid. Each thermoelectric assembly further comprises a second heat exchanger in thermal communication with the second side of the thermoelectric assembly and with the region corresponding to the thermoelectric assembly. The network further comprises one or more conduits fluidically coupled to the first heat exchangers of each thermoelectric assembly of the plurality of thermoelectric assemblies. The one or more conduits provide a flowpath through which the first working fluid flows to and from each of the first heat exchangers.
In certain embodiments, the first working fluid comprises water and can flow sequentially through the plurality of thermoelectric assemblies. The first working fluid of certain embodiments flows in parallel through at least some thermoelectric assemblies of the plurality of thermoelectric assemblies.
In certain embodiments, the second heat exchanger is configured to be in thermal communication with a second working fluid, which can comprise air. In certain embodiments, the second working fluid provides localized heating or cooling (e.g., conditioned air) to a volume. In certain embodiments, the volume comprises a passenger compartment of a vehicle or a portion of a building.
In certain embodiments, the network further comprises a central processing unit. Flow of the first working fluid through the one or more conduits to each first heat exchanger is adjustable in certain embodiments by at least one valve responsive to signals from the central processing unit. In certain embodiments, the network further comprises at least one sensor in electrical communication with the central processing unit. The central processing unit is configured to receive at least one signal from the at least one sensor. The at least one signal of certain embodiments is indicative of at least one condition within a volume to be locally heated or cooled. The at least one condition can be selected from the group consisting of: ambient temperature, local surface temperature, radiant loads, humidity, occupant number, occupant weight, occupant clothing thickness, and occupant location.
In certain embodiments, the network further comprises a thermal storage reservoir fluidically coupled to the one or more conduits. In certain such embodiments, the thermal storage reservoir is configured to store thermal power during peak generation events and to return thermal power to the first working fluid according to need. In certain embodiments, the network further comprises an intermediate heat exchanger fluidically coupled to the one or more conduits. In certain such embodiments, the intermediate heat exchanger is in thermal communication with a target object to be cooled or heated.
In certain embodiments, a network of distributed thermoelectric assemblies is provided for heating, cooling, or both heating and cooling localized portions of a passenger compartment of a vehicle. The network comprises a plurality of thermoelectric assemblies. Each thermoelectric assembly has a first side and a second side. Each thermoelectric assembly is selectively operable either to heat a region corresponding to the thermoelectric assembly by transferring heat from a first working fluid to the region corresponding to the thermoelectric assembly or to cool the region corresponding to the thermoelectric assembly by transferring heat from the region corresponding to the thermoelectric assembly to the first working fluid. Each thermoelectric assembly is operable independently from operation of other thermoelectric assemblies of the plurality of thermoelectric assemblies. Each thermoelectric assembly comprises a plurality of thermoelectric elements in thermal communication with the first side and with the second side of the thermoelectric assembly. Each thermoelectric assembly further comprises a first heat exchanger in thermal communication with the first side of the thermoelectric assembly. The first heat exchanger is configured to be in thermal communication with the first working fluid. Each thermoelectric assembly further comprises a second heat exchanger in thermal communication with the second side of the thermoelectric assembly. The second heat exchanger is configured to be in thermal communication with a second working fluid. The network further comprises one or more conduits fluidically coupled to the first heat exchangers of each thermoelectric assembly of the plurality of thermoelectric assemblies. The one or more conduits provide a flowpath through which the first working fluid flows to and from each of the first heat exchangers.
In certain embodiments, the first working fluid has a first thermal capacity and the second working fluid has a second thermal capacity less than the first thermal capacity. For example, the first working fluid can comprise a liquid (e.g., a 50/50 mixture of ethylene glycol and water) and the second working fluid can comprise a gas (e.g., air). In certain embodiments, each first heat exchanger comprises extruded aluminum tubes and each second heat exchanger comprises aluminum fins brazed between aluminum face sheets.
In certain embodiments, the one or more conduits are selectively fluidically coupled by one or more valves to an engine coolant loop or an auxiliary cooling radiator of the vehicle. In certain embodiments, the one or more conduits are fluidically coupled by one or more valves to a heat exchanger in thermal communication with a vehicle battery or a vehicle fuel tank.
In certain embodiments, air from at least one of the second heat exchangers is outputted into the passenger compartment from at least one location selected from the group consisting of: the headliner, one or more pillars, one or more seat cushions, one or more seat backs, and the steering column. In certain embodiments, at least one of the second heat exchangers is configured to provide temperature control for electronic equipment of the vehicle, a vehicle battery, or an inner volume of a storage container of the vehicle.
In certain embodiments, the network further comprises at least one waste heat exchanger in thermal communication with the first working fluid and configured to direct heat from the first working fluid to a thermal mass outside the passenger compartment. The thermal mass of certain embodiments is selected from the group consisting of: a frame portion, a fuel tank, a battery, and a phase change thermal capacitor. In certain embodiments, the network is configured to be operable for a period of time during which a source of electrical power for the vehicle (e.g., an engine, a battery, a capacitor, a fuel cell, a solar cell, or a flywheel) is off. In certain embodiments, the source of electrical power is the primary source of electrical power for the vehicle.
In certain embodiments, a method for heating, cooling, or both heating and cooling localized portions of a vehicle is provided. The method comprises providing a thermoelectric system comprising at least one fluid conduit configured to allow a first working fluid to flow therein and a plurality of thermoelectric assemblies. Each thermoelectric assembly comprises a plurality of thermoelectric elements. Each thermoelectric assembly is in thermal communication with the first working fluid and in thermal communication with a region of the vehicle corresponding to the thermoelectric assembly. Each thermoelectric assembly is selectively operable either to heat the region corresponding to the thermoelectric assembly by transferring heat from the first working fluid to the region corresponding to the thermoelectric assembly or to cool the region corresponding to the thermoelectric assembly by transferring heat from the region corresponding to the thermoelectric assembly to the first working fluid. Each thermoelectric assembly is operable independently from operation of other thermoelectric assemblies of the plurality of thermoelectric assemblies. The method further comprises preconditioning at least one region of the vehicle by operating at least one thermoelectric assembly of the thermoelectric system.
In certain embodiments, preconditioning the at least one region comprises cooling or heating at least a portion of a passenger compartment of the vehicle prior to an occupant entering the passenger compartment of the vehicle. In certain embodiments, preconditioning the at least one region comprises cooling at least a portion of a passenger compartment of the vehicle below a condensation temperature so as to remove water vapor from the passenger compartment. In certain embodiments, preconditioning the at least one region comprises placing a battery of the vehicle at an optimum temperature. In certain embodiments, preconditioning the at least one region comprises placing a catalytic converter of the vehicle at an optimum temperature.
A distributed system described by Elliot et al. (U.S. Patent Application Publication No. US2007/0000255, published Jan. 4, 2007, “Autonomous Air-Conditioning Module Intended Particularly for the Thermal Treatment of an Area of a Vehicle Cabin”) heats and cools automobile passenger cabin air by circulating the air through localized and autonomously controlled thermoelectric devices. The modules have air intake and exhaust features to force the air through the Peltier devices. The system, however, is limited in capacity as the result of several factors.
Firstly, the thermoelectric module described by Elliot operates by recirculating cabin air through a thermoelectric device. The thermal capacity of such a device is significantly limited according to the relatively low heat capacity of the working fluids used compared certain embodiments described herein.
Secondly, the thermoelectric device described by Elliot is inefficient compared to certain embodiments described herein and its operation is limited to about 12% of the Carnot efficiency with TE materials with a ZT of 1.
Thirdly, the device described by Elliot is bulky compared to certain embodiments described herein, using much more thermoelectric material (limiting capacity) and increasing the cost of the device.
Fourthly, the advantages of connecting such devices in a network where the devices share a common primary working fluid to gain system and device efficiency and capacity advantages is not anticipated or depicted in prior art.
Certain embodiments described herein provide a thermoelectric system and method that provides a significantly higher device and system efficiency and larger thermal capacity for distributed and localized heating and cooling than those described in the prior art.
Certain embodiments described herein provide a ventilating, heating and cooling system that overcomes the drawbacks and has significantly greater efficiency than that of prior art. More specifically, certain embodiments described herein aim to provide a high capacity of distributed and localized heating and cooling in an efficient manner.
As used herein, the phrase “each TE assembly” has a broad meaning, including, but not limited to, referring to an individual TE assembly of the plurality of TE assemblies. The thermoelectric system 100 of certain embodiments may comprise one or more other TE assemblies, besides those of the plurality of TE assemblies 120, which do not have one or more of the attributes described herein for the TE assemblies 120 which comprise the plurality of TE assemblies 120. In particular, the phrase “each TE assembly” is not to be interpreted to mean that every TE assembly of the thermoelectric system 100 conforms to the description herein.
As used herein, the phrase “region corresponding to a TE assembly” has a broad meaning including, but not limited to, a region in proximity to a TE assembly, a region in thermal communication with a TE assembly, or a region which is cooled or heated by operation of a TE assembly. Such regions do not have a specific size, shape, orientation, or position relative to the TE assemblies to which they correspond, but one or more properties of such a region (e.g., temperature, humidity) are affected at least by operation of the TE assembly to which the region corresponds. While the regions 130 of
In certain embodiments, the thermoelectric system 100 can comprise a network of distributed TE assemblies which is configured to provide distributed localized climate control (e.g., control of temperature, humidity, or both by heating, cooling, or both) to a volume in which people, animals, or climate-sensitive equipment may reside. For example, in certain embodiments, the thermoelectric system 100 is configured to provide conditioned air to a passenger compartment of a vehicle (e.g., car, truck, bus, train, airplane, ship), to an occupied portion of a building, or to provide climate control (e.g., control of temperature, humidity, or both by heating, cooling, or both) to electronic equipment.
In certain embodiments, the first working fluid 112 is a liquid (e.g., water), while in certain other embodiments, the first working fluid 112 is a gas (e.g., air). In certain embodiments, as schematically illustrated by
In certain embodiments, the plurality of TE assemblies 120 comprise one or more improved, high efficiency TE assemblies utilizing thermal isolation and/or high density design and construction (see, e.g., U.S. Pat. No. 6,539,725, issued to Bell on Apr. 1, 2003, “High Efficiency Thermoelectrics Utilizing Thermal Isolation,” and U.S. Pat. No. 6,625,990, issued to Bell on Sep. 30, 2003, “Thermoelectric Power Generation Systems,” each of which is incorporated in its entirety by reference herein). Other types of TE assemblies 120 are also compatible with various embodiments described herein. The TE assemblies 120 can be arranged in a series and/or parallel network with one another in which the TE assemblies 120 are connected (e.g., by electric power, device and system level control, sensory feedback, or working fluid flow).
Each TE assembly 120 of the plurality of TE assemblies 120 comprises a plurality of TE elements 122. In certain embodiments, the plurality of TE elements 122 comprises a plurality of N-type TE elements 122a and a plurality of P-type TE elements 122b. Each TE assembly 120 of certain embodiments further comprises a plurality of electrically conductive and thermally conductive connectors 123. In certain embodiments, each connector 123 is in electrical communication and in thermal communication with at least one of the plurality of N-type TE elements 122a and with at least one of the plurality of P-type TE elements 122b.
In certain embodiments, each TE assembly 120 has a first side and a second side, and the TE assembly 120 is configured to transfer heat between the first side and the second side.
In certain embodiments, each TE assembly 120 comprises a first heat exchanger 124 in thermal communication with a first set of the connectors 123 and a second heat exchanger 125 in thermal communication with a second set of the connectors 123. In certain embodiments, upon operation of the TE assembly 120, the first heat exchanger 124 is either cooled or heated by the first set of the connectors 123 and the second heat exchanger 125 is either heated or cooled by the second set of the connectors 123.
In certain embodiments, the first heat exchanger 124 comprises a solid material and comprises a first side of the TE assembly 120 in thermal communication with the first working fluid 112. The first heat exchanger 124 of certain embodiments comprises the at least one fluid conduit 110. For example, the first heat exchanger 124 can comprise a portion (e.g., a wall) of a pipe or duct in thermal communication with the first set of the connectors 123 and through which the first working fluid 112 flows. In certain embodiments, the first heat exchanger 124 comprises a plurality of fins 127 across which the first working fluid 112 flows, for example as schematically illustrated by
In certain embodiments, the second heat exchanger 125 comprises a solid material and comprises a second side of the TE assembly 120 in thermal communication with a second working fluid 126. In certain embodiments, the second heat exchanger 125 comprises a plurality of fins 128 across which the second working fluid 126 flows, for example as schematically illustrated by
In certain embodiments, the second working fluid 126 is the same as the first working fluid 112, while in certain other embodiments, the second working fluid 126 is different (e.g., of a different material or phase) than the first working fluid 112. For example, in certain embodiments, at least one of the first working fluid 112 and the second working fluid 126 is a liquid. In certain embodiments, one of the first working fluid 112 and the second working fluid 126 is a liquid (e.g., water), and the other is a gas (e.g., air). In certain embodiments in which the second working fluid 126 comprises a gas, the thermoelectric system 100 further comprises one or more fans which drive the second working fluid 126 from the region 130 corresponding to the TE assembly 120 to the volume to be cooled or heated. In certain embodiments, the second working fluid 126 for the various TE assemblies 120 of the thermoelectric system 100 can be the same or different from one another. For example, for each TE assembly 120 in the thermoelectric system 100, the second working fluid 126 can be selected based upon characteristics of the target region 130 corresponding to the TE assembly 120. In cooling mode, the second working fluid 126 is cooled as it passes through the TE assembly 120 and in heating mode, the second working fluid 126 is heated as it passes through the TE assembly 120. In certain embodiments, the second working fluids 126 are used to extract or deliver thermal power to target regions 130 in the distributed system.
In certain embodiments, during operation of the thermoelectric system 100, thermal power is pumped between the first working fluid 112 flowing in the at least one fluid conduit 110 and the second working fluid 126 flowing in the second heat exchanger 125. In certain such embodiments, one purpose of the first working fluid 112 can be to provide a thermal source or sink for the distributed TE assemblies 120 that are in thermal communication with the first working fluid 112. In certain embodiments, the purpose of the second working fluid 126 (and of the second heat exchanger 125) can be to deliver the thermal power, derived in parts from the first working fluid 112 and the TE elements 122 to the distributed and localized target regions 130 corresponding to the TE assemblies 120.
As schematically illustrated by
In certain embodiments, the thermoelectric system 100 further comprises a controller 150 (e.g., a central processing unit or microcontroller) and a plurality of switches 151 configured to selectively provide current flow to the TE elements 122 so as to adjust, turn on, or turn off the TE elements 122 of the TE assemblies 120. In certain embodiments, the thermoelectric system 100 further comprises at least one sensor in electrical communication with the controller 150. The controller 150 is configured to receive at least one signal 152 from the at least one sensor, the at least one signal indicative of at least one condition for the thermoelectric system 100 (e.g., sensor data indicative of the ambient temperature, local surface temperature, radiant loads, temperature or fluid flow of the first working fluid 112, temperature or fluid flow of the second working fluid 126, temperature, humidity, or other operating conditions of the regions 130, number of occupants of the regions 130, occupant weight, occupant clothing thickness, occupant location, and user commands). The controller 150 is configured to respond to the signals 152 by transmitting command signals 154 to the flow controllers 140 and to switches 151 so as to control the operation of the TE assemblies 120. In certain embodiments, flow of the first working fluid 112 through the one or more conduits fluidically coupled to the first heat exchangers 124 is adjustable by at least one valve responsive to signals from the controller 150. In certain embodiments in which the thermoelectric system 100 further comprises one or more fans to control the flow of the second working fluid 126 from the TE assemblies 120, the controller 150 is further configured to transmit command signals 154 to the fans as well.
In certain embodiments, the controller 150 advantageously provides local control of the comfort air delivered by the TE assemblies, thereby advantageously providing individual passenger comfort. A distributed thermoelectric system 100 comprising one or more TE assemblies 120 may be controlled by using sensors and algorithms designed to manage fluid flow rates and temperatures of the first working fluid 112 and/or the second working fluid 126.
Input signals to the controller 150 can comprise feedback and control information from the target regions and/or objects to be cooled or heated. Such information may include, but is not limited to, parameters such as temperatures of the regions (e.g., portions of the passenger cabin), occupants (e.g., measured using infrared sensors), objects (e.g., electronic equipment), engine, engine coolant, or working fluids, input power, vehicle electrical network power, occupant number, occupant weight, occupant size, occupant clothing thickness, occupant surface temperatures, occupant location (e.g., sensing proximity to cooling/heating vents), radiant loads, humidity levels, and any other useful parameter. Control feedback signals generated by the controller 150 can include, but are not limited to, target zone temperatures, target occupant skin temperatures, and target outside/inside average temperatures. Control signals generated by the controller 150 can include, but are not limited to, signals which are used to control the localized cooling or heating in various regions by controlling the pumps, fans, valves, or TE assemblies (e.g., heating mode, cooling mode).
In certain embodiments, temperature control modes (heating and cooling) may be changed by reversing input power polarity and may be selected locally by the user or centrally (e.g., by the controller 150) utilizing sensory input signals and control algorithms. In certain embodiments, a means for localized and autonomous control (e.g., a separate controller such as a microcontroller) may be provided for each TE assembly 120 in conjunction with sensors for indicating first and second working fluid temperatures for the purpose of temperature control and device safety. The control of a distributed system comprising several or many such TE assemblies 120 alternatively may be centralized by means of sensors and algorithms designed to manage first and second fluid flow rates and temperatures with feedback from the target regions 130.
In certain embodiments, at least a portion of the first working fluid 112 is sequentially in thermal communication with two or more TE assemblies 120. For example, the portion of the first working fluid 112 flows through the at least one fluid conduits 110 of two or more TE assemblies 120. In certain such embodiments, the portion of the first working fluid 112 is heated by at least one of the TE assemblies 120 and is cooled by at least one of the TE assemblies 120. In certain embodiments, the first working fluid 112 flows in parallel through at least some TE assemblies 120. In certain embodiments, at least a portion of the first working fluid 112 is not in thermal communication with two or more TE assemblies 120. For example, the portion of the first working fluid 112 flows through a single TE assembly 120, or flows through none of the TE assemblies 120.
In certain embodiments, the thermal storage reservoir 160 is fluidically coupled to the at least one fluid conduit 110 and is configured to receive the first working fluid 112. Thermal storage provided by the thermal storage reservoir 160 may be used advantageously in combination with the other portions of the thermoelectric system 100 to improve over-all system efficiency and capacity by storing thermal power during peak generation events and returning the first working fluid 112 to the thermoelectric system 100 according to need.
In certain embodiments, the intermediate heat exchanger 170 is in thermal communication with the first working fluid 112, and is in thermal communication with a target object to be cooled or heated. In certain such embodiments, the intermediate heat exchanger 170 advantageously provides opportunities to reject or absorb heat from the first working fluid 112 to heat sinks or heat sources isolated from the regions 130 corresponding to the TE assemblies 120.
In certain embodiments in which both heating and cooling are desired, the configuration of the first working fluid loop 113 and the flow of the second working fluid 126 through the TE assemblies 120 may be altered or combined to improve system efficiency. For example, as the first working fluid 112 is cooled as it passes through a succession of TE assemblies 120 operating in heating mode (e.g., providing warmed comfort air to a region 130), the first working fluid 112 may be directed to cool a target object (e.g., high electric power dissipation electronics) where the drop in temperature over several TE assemblies 120 operating in heating mode may accrete to the cooling performance of a separate target object in a different location. Alternatively, where a first working fluid 112 receives energy while the thermoelectric system 100 is operated to cool one or more target regions 130, the resulting heated first working fluid 112 may be used to provide heat which is transferred by a subsequent TE assembly 120 to heat a corresponding region 130. Networks of first working fluid loops 113 and second working fluid loops may be employed where the localized second working fluid loops provide first working fluid functionality to separate TE assemblies 120 operating in the same or different temperature modes.
The advantages of certain embodiments described herein over prior art systems include, but are not limited to:
1. Networking of thermally isolated and/or high power density TE assemblies 120 within a distributed heating/cooling thermoelectric system 100 can improve the efficiency, capacity and/or cost basis;
2. Using a first working fluid 112 that communicates with each TE assembly 120 advantageously that can provide a higher device and system efficiency and capacity; and
3. Networking and distribution of the first working fluid 112, electric power, device and system control, and sensor feedback can advantageously combine to provide higher system efficiencies and/or capacities at lower cost.
The TE assembly 220 operates in heating mode by pumping heat from the ethylene glycol/water working fluid 212 through the TE assembly 220 to the air 226. In cooling mode, thermal energy is pumped by the TE assembly 220 from the air 226 to the ethylene glycol/water working fluid 212. The thermal capacity of the liquid side of the TE assembly 220 is much greater than that of the air side, so that advantageously the liquid temperature changes very little and the resulting thermal power rejected can be transported away from the TE assembly 220 with minimal temperature rise. The efficiency of the TE assembly 220 can be approximately two times that of conventional devices due to the use of thermal isolation, and the amount of thermoelectric material used can be reduced typically by a factor of 6 to 25 by means of the high density design and construction of the TE assembly 220. The capacity of the TE assembly 220 to deliver heating or cooling power is approximately 2 to 6 times that of an air-to-air device because the liquid working fluid 212 offers a larger thermal source and/or sink than would be the case with air as the first working fluid.
In an example thermoelectric system 100 utilizing a plurality of TE assemblies 220 schematically depicted by
In heating mode, the thermoelectric system 100 may utilize engine coolant as the liquid working fluid 212 to assist in rapidly boosting the temperature of the passenger compartment of the vehicle. For example, as schematically illustrated by
In certain embodiments, the TE assemblies 220 may be scaled and positioned in several ways to provide localized heating, cooling, or both heating and cooling of a passenger compartment 244 according to the required capacity of the thermoelectric system 100, as schematically illustrated by
In addition, liquid-to-air TE assemblies 220 may be located in one or more seat cushions 250 and/or one or more seat backs 260 as schematically illustrated by
In certain embodiments, advantageously, the liquid-to-air TE assemblies 220 and the liquid-to-liquid TE assemblies 220 incorporate thermal isolation and/or high density design and construction (e.g., as described in U.S. Pat. Nos. 6,539,725 and 6,625,990 which are incorporated in their entireties by reference herein). In certain such embodiments, the TE assemblies 220 can provide significantly higher thermal capacity than air-to-air devices. In addition, in certain embodiments, the TE assemblies may use less thermoelectric material, and may operate at higher efficiency and therefore may provide cost savings. In addition, the greater thermal capacity of a first working fluid loop using liquids can be greater than that of one using air resulting in certain embodiments described herein providing a larger thermal capacity for cooling and/or heating of target regions and/or objects.
In certain embodiments, the liquid working fluid loop connecting the TE assemblies 220 may have one or more waste heat exchangers which transfer waste thermal energy at various positions from the liquid working fluid loop to a thermal mass or regions outside the passenger compartment 244. For example, as schematically illustrated by
In certain embodiments, the thermoelectric system 100 can be operable in a vehicle or other application for a period of time with the primary source of electric power off (e.g., engine off operation) by using a source of auxiliary power (e.g., battery, capacitor, fuel cell, solar cell, flywheel, and/or any other source of power).
Because centralized heating and cooling systems require a significant amount of input energy and engine operation to provide comfort air and to condition sensitive systems, their use has been limited to periods when the vehicle engine is operating. It is desirable, however, to precondition certain areas and sensitive systems prior to vehicle operation such as at the start or the finish of the day. Preconditioning can significantly increase passenger comfort, increase the life expectancy of sensitive systems, and can be programmed or operated autonomously to reach desired operating conditions corresponding to anticipated needs using presently available devices such as cell phones or key fobs.
The method 300 further comprises preconditioning at least one region 130 of the vehicle by operating at least one TE assembly 120 of the thermoelectric system 100 in an operational block 320. In certain embodiments, the thermoelectric system 100 is used to precondition selected regions or areas and/or sensitive systems or equipment prior to the engine being turned on. For example, prior to a person entering the vehicle, the thermoelectric system 100 is activated (e.g., using a cell phone or key fob) and is used to establish the desired temperature conditions (e.g., temperatures within the seat surfaces and throughout the steering wheel). The power source for the thermoelectric system 100 in certain such embodiments is the vehicle battery. In certain other embodiments, the power is provided from an external source via a power connection to the vehicle (e.g., a power cord plugged into an outlet in a building garage). In certain such embodiments, the passenger compartment of a vehicle can be precooled down on a hot day, or preheated on a cold day, prior to occupant entry. In certain embodiments, the thermoelectric system 100 can be used to precondition at least a portion of a passenger compartment of the vehicle by cooling the portion below a condensation temperature so as to remove water vapor from the passenger compartment.
In addition, preconditioning can be performed for sensitive systems of the vehicle. Such sensitive systems may include, but are not limited to, a battery or a catalytic converter. In certain embodiments, preconditioning is used to place the sensitive system at an optimum temperature that maintains and extends the life of the sensitive system (e.g., optimizing the battery's temperature to maintain and extend the battery life). This is especially advantageous for highly electrified vehicles with large and expensive battery systems. Preconditioning can also be performed to establish desired temperatures of storage containers that hold food products or sensitive materials such as biologic specimens.
In certain embodiments, preconditioning is performed using preprogrammed or autonomous control (e.g., using a cell phone or key fob) to establish desired temperature conditions prior to periods of anticipated usage, such as at the start or end of the day. For example, much like the preset thermostatic control in buildings, a schedule for activating preconditioning may be set in advance and controlled by a central processing unit or microcomputer. Alternatively, the preconditioning may be activated by a remote control means when desired. In addition, the thermal storage systems of such a network may be preconditioned as well to deliver improved efficiency during vehicle operation.
Certain embodiments described herein provide an advantageous method for heating and/or cooling occupants and/or equipment, buildings, and any other use by focusing thermal power so as to not waste energy on non-target objects. Certain embodiments described herein advantageously conserve energy by using thermoelectric devices to generate and distribute thermally conditioned fluids at or in close proximity of target objects. In doing so, the inefficiencies associated with centralized systems due to losses occurring as a result of extraneous object cooling can be avoided at least in part.
A wide range of thermal management systems are enabled by certain embodiments described herein. For example, occupants of buildings may have comfort air provided in close proximity of their work surroundings without the need to thermally condition surrounding infrastructure. In addition, the occupants may autonomously control their local temperature environment by means of simple and direct controls.
Portions of the temperature-sensitive areas, such as high density computer boards, racks, or equipment, may be conditioned locally by employing certain embodiments described herein. Certain embodiments advantageously allow such areas to be managed in proportion to the need, as opposed to functioning of centralized systems that condition an entire room or building volume without regard to local need. Thus, over cooling non-operative or low dissipation equipment and under cooling or marginally cooling highly dissipative equipment can be avoided.
Passenger vehicles have begun to adopt localized thermal management to improve passenger comfort, however such systems rely on centralized A/C systems that are not as energy efficient as needed due to the excess capacity power to condition non-essential structural elements including floors, windows, head liners, etc. Thermoelectric systems have begun to be deployed to address these issues; however their design and construction causes their efficiency and cost to fall short of commercial acceptance.
Certain embodiments described herein address these shortcomings by combining thermoelectric materials advantageously using thermal isolation and/or high density designs and construction. In addition, by careful selection of the working fluids, these systems can provide significant efficiency, cost, and/or thermal capacity increases over the prior art.
Various embodiments have been described above. Although the invention has been described with reference to these specific embodiments, the descriptions are intended to be illustrative of the invention and are not intended to be limiting. Various modifications and applications may occur to those skilled in the art without departing from the true spirit and scope of the invention as defined in the appended claims.
This application claims the benefit of U.S. Provisional Application No. 60/940,372, filed May 25, 2007, which is incorporated in its entirety by reference herein, and U.S. Provisional Application No. 60/953,157, filed Jul. 31, 2007, which is incorporated in its entirety by reference herein.
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