US20110197611A1 - Method and system for cooling and warming - Google Patents
Method and system for cooling and warming Download PDFInfo
- Publication number
- US20110197611A1 US20110197611A1 US13/124,700 US200913124700A US2011197611A1 US 20110197611 A1 US20110197611 A1 US 20110197611A1 US 200913124700 A US200913124700 A US 200913124700A US 2011197611 A1 US2011197611 A1 US 2011197611A1
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- United States
- Prior art keywords
- circuit
- radiator
- flow
- changeover switch
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 21
- 238000010792 warming Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title abstract description 5
- 239000003507 refrigerant Substances 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004378 air conditioning Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims 2
- 239000000498 cooling water Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002826 coolant Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00378—Air-conditioning arrangements specially adapted for particular vehicles for tractor or load vehicle cabins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00899—Controlling the flow of liquid in a heat pump system
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3228—Cooling devices using compression characterised by refrigerant circuit configurations
- B60H1/32284—Cooling devices using compression characterised by refrigerant circuit configurations comprising two or more secondary circuits, e.g. at evaporator and condenser side
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H2001/00928—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices comprising a secondary circuit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H2001/00935—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices comprising four way valves for controlling the fluid direction
Definitions
- the present invention relates generally to compressor systems which have closed refrigerant circuits for cooling and warming purposes and comprise at least a condenser and an evaporator.
- the invention relates more specifically to a method and a system for cooling or warming the interior of a vehicle and particularly the driving space of a commercial vehicle, e.g. vehicles with tiltable cabs.
- the invention relates in particular to compressor systems which comprise a liquid-cooled condenser and evaporator and have a low-pressure circuit for conveying hot or cold liquid to the driving space.
- Known air conditioning systems in vehicles usually comprise a compressor, an air-cooled condenser situated at or near the front of the vehicle, an evaporator situated somewhere in the vehicle's cab, e.g. in or under the instrument panel, and pipelines or hoses which connect these components together to form a hermetically sealed and pressurised system which usually also comprises an expansion means and a dry filter or an accumulator.
- a number of different gases may be used as refrigerant but R134a is often used in vehicle applications.
- Vehicles with tiltable cabs require longer hoses/lines and/or more connections to be able to connect the cooling element in the cab to other necessary parts of the cooling system which are usually situated in the vehicle's engine space.
- a further cooling loop a so-called secondary loop, is used, i.e. that a further low-pressure cooling circuit with a liquid as thermal transfer medium is connected to the compressor system's evaporator via a liquid-based heat exchanger.
- the liquid usually water or a mixture of water and glycol, is thus cooled in the refrigerant circuit's evaporator and is pumped up to the cab and to the cooling element therein situated, which in its turn cools the air of the cab by means of a fan. It is of course also possible to use other liquid-based coolants.
- An AC system of said kind is therefore normally used for cooling the air in the cab, while a separate water-borne heating system is used for warming the cab air as necessary.
- This separate system is usually supplied with hot water/cooling water from the vehicle's engine.
- the cooling water will have cooled so much that it is no longer possible for any hot water to be pumped to the cab element, with the result that the cab air can no longer be kept warm.
- the engine in a heavy vehicle has a large mass which needs warming up and the cooling water volume alone may be up to 100 litres. Even after the engine has been started, it therefore takes quite a while before its cooling water reaches such a temperature that it can be used effectively for warming the cab air.
- the refrigerant circuit in a compressor system usually generates cold and heat almost immediately after starting and with an outer cooling circuit containing only a few litres of liquid it is possible to begin producing heat/cold quickly, within the order of a few minutes.
- the pre-existing AC system can also be used as a heat pump. This can be done, for example, by reversing the flow in the refrigerant circuit.
- the problem with this is that reversing the refrigerant circuit, i.e. changing the direction of flow of the refrigerant, will not be fully effective, since a condenser functions less well as an evaporator and an evaporator functions less well as a condenser. The overall efficiency of the system will suffer.
- WO2007/107535 refers to a system with two evaporators or condensers fitted in a vehicle cab. It is possible to choose whether none, one or more are to function as condensers and the others as evaporators. Thus the AC system may cool, warm or dry the air in the cab. The device will be relatively complicated and the flow will be alternated on the refrigerant side, i.e. in the pressurised refrigerant circuit.
- U.S. Pat. No. 6,928,831 describes an AC system with combined condenser/gas cooler and evaporator which is usable as both cooling system and heat pump in vehicles.
- a directional valve “118” connects together the units “141” and “142”.
- the engine's cooling water is used as heat source for the heat pump and the flow is alternated on the refrigerant side. That invention exhibits similarities with the aforesaid WO2007/107535.
- Prior art thus does not show how the compressor system in a vehicle can be used effectively for both cooling and warming of, for example, a driving cab.
- the object of the invention is to solve said problems and provide a method and a system for effective cooling and/or warming of, for example, a vehicle cab, using the same refrigerant for both and without alternating or reversing the flow in the refrigerant circuit.
- a further object of the invention is to keep down the number of components in the cooling/warming system and to provide a simple compact solution which is easy to accommodate in the vehicle.
- the invention is effected principally by the outer low-pressure circuits of the system being connected together so that the condenser of the refrigerant circuit warms liquid which is supplied to the element in the vehicle's driving space, and the evaporator of the refrigerant circuit cools liquid which is released from the element.
- the invention entails the refrigerant circuit, irrespective of whether cold or heat is to be supplied from the system and, for example, be transferred to the vehicle's driving space, being allowed to operate in a normal way whereby the condenser and the evaporator are used simply as condenser and evaporator irrespective of whether hot or cold water is to be produced.
- a condenser is in fact configured to function most effectively as a condenser, and an evaporator to function effectively as an evaporator.
- the invention also entails the possibility of the flows in the system's secondary circuits being switched between AC operation and heat pump operation in such a way that liquid which is heated by the refrigerant circuit's condenser can be pumped to the cab element instead of the liquid which is cooled in the refrigerant circuit's evaporator.
- the invention is achieved by the two secondary circuits being united, for heat pump operation, via a flow changeover switch, to form a common single circuit without changing the main direction of flow in any of the circuits.
- FIG. 1 depicts schematically a compressor system according to the invention with two outer closed and separate liquid-based circuits for cooling and release of surplus heat respectively.
- FIG. 2 depicts schematically the compressor system according to the invention according to FIG. 1 but with the outer secondary circuits reconnected in series with one another with the object of being able to deliver heat instead of cold to the driving space.
- FIG. 3 depicts schematically the compressor system according to the invention according to FIG. 2 for heat pump operation whereby the low-pressure radiator is bypassed by means of an alternatively configured valve.
- FIG. 1 depicts a compressor system 1 according to the invention, connected for AC operation.
- the compressor system 1 comprises in this case three separate and distinct closed circuits, viz. the primary refrigerant circuit 2 , an element circuit 3 and a radiator circuit 4 .
- the primary refrigerant circuit 2 is a hermetically sealed circuit and operates with a refrigerant, a gas, under pressure.
- the refrigerant circuit 2 comprises a compressor 5 , a condenser 6 , an evaporator 7 , a dry filter 8 and an expansion means 9 , and the components are connected to one another by a hose system or pipeline system. Heat is released in the condenser 6 and heat is absorbed in the evaporator 7 .
- Both the evaporator 7 and the condenser 6 are each co-assembled with their respective liquid-based heat exchanger 10 , 11 , and the evaporator 7 is therefore heated by the liquid in the element circuit 3 and the condenser 6 is cooled by the liquid in the radiator circuit 4 .
- the element circuit 3 comprises not only the heat exchanger 10 which is co-assembled with the evaporator 7 but also a first low-pressure pump 12 and an element 13 and operates with liquid at relatively low pressure.
- the element 13 is situated in a space which is to be warmed or cooled, e.g. in the interior or cab of a vehicle. Air is blown through the element 13 by an undepicted fan and the air which passes is warmed or cooled depending on the temperature of the liquid. The air in the cab is thus kept at, for example, a preset temperature.
- the radiator circuit 4 comprises a low-pressure pump 14 , a heat exchanger 11 co-assembled with the refrigerant circuit's condenser 6 and a low-temperature radiator 15 .
- the radiator 15 is usually air-cooled and situated near to the front of the vehicle where the draught caused by vehicle movement may help to create an air flow through the radiator 15 so that heat exchange to the environment can take place when the vehicle is in motion.
- the engine's fan system may also be used for blowing air through the radiator 15 .
- a flow changeover switch 16 e.g. a two-position four-way valve 16 a, is adapted to controlling the coolant flows in the compressor system 1 .
- the valve 16 a may in this embodiment example be switched physically/manually between its two positions, against the action of a spring 17 , or electromechanically via an undepicted electrical circuit-breaker situated on, for example, the vehicle's instrument panel.
- the valve 16 a is here depicted in a first functional position in which all of the circuits 2 , 3 , 4 are separated, distinct, from one another and the flows in the respective circuits 2 , 3 , 4 are provided by respective compressors or pumps 5 , 12 , 14 in the direction of the arrows.
- the flow in the refrigerant circuit 2 is provided by the compressor 5 and passes from the compressor 5 through the condenser 6 , in which heat is released, via the dry filter 8 and the expansion means 9 to the evaporator 7 , in which heat is absorbed, and thereafter back to the compressor 5 .
- the flow in the element circuit 3 is provided by the pump 12 and passes from the pump 12 through the element 13 , which may for example be situated in the vehicle's cab, where heat is absorbed, and proceeds to the heat exchanger 10 which is integrated with the refrigerant circuit's evaporator 7 and in which heat is released, and back to the pump 12 via the valve 16 a.
- the flow in the radiator circuit 4 is provided by the pump 14 and passes via the heat exchanger 11 which is integrated with the refrigerant circuit's condenser 6 and in which heat is absorbed, and proceeds via the valve 16 a to the radiator 15 , in which surplus heat is released to the environment.
- FIG. 2 depicts the same system as in FIG. 1 but with the flow changeover switch, the valve 16 a, depicted in its second functional position, for heat pump operation, whereby the flow through the valve 16 a is here crossed instead.
- the flow is thus changed so that the secondary circuits, viz. the element circuit 3 and the radiator circuit 4 in FIG. 1 , are united to form a common single circuit.
- the components in the original two circuits here operate, as regards flow, in series with one another, and the pumps 12 , 14 cooperate with one another in a single flow.
- the primary refrigerant circuit 2 is not affected at all, as the flow in it proceeds in a usual/normal manner.
- the circuit formed in the second functional position of the valve 16 a carries a flow from the pump 14 through the heat exchanger 11 , through the valve 16 a and on to the pump 12 , the element 13 , the heat exchanger 10 and again through the valve 16 a to the radiator 15 and back to the pump 14 .
- FIG. 3 depicts a further alternative embodiment of the compressor system 1 according to the invention. If much power is extracted from the evaporator 7 when the compressor system 1 is run as a heat pump, the coolant will become colder and the low pressure in the refrigerant circuit 2 will become low. In this situation, the coolant in the radiator 15 will be warmed, since it will be colder than the ambient temperature of the radiator 15 . Low temperature results in low pressure and low mass flow in the refrigerant circuit 2 , which is less good. If only a small amount of power is extracted from the evaporator 7 , the low pressure may rise, with a corresponding rise in the high pressure in the refrigerant circuit.
- Bypassing the radiator 15 makes it possible for the liquid to gradually warm up in order to raise the temperature after the heat exchanger 11 of the condenser 6 , thereby achieving more power in the system.
- a check valve 17 may possibly be used to prevent liquid from reaching the radiator 15 the back way.
- the two circuits 3 , 4 may therefore with advantage be connected to an expansion tank by hoses or pipelines of small diameter. It is perfectly possible to use a common single expansion tank for the two circuits 3 , 4 . This is prior art and is not referred to or described in more detail here.
- the refrigerant circuit may also comprise one or more internal heat exchangers. It is also possible for the evaporator and the condenser to be mutually co-assembled with the object of creating a compact unit which can supply both warm and cold liquid for cooling and heating purposes.
- the flow changeover switch may of course be configured in various ways for controlling the flows of the circuits.
- valve it is for example conceivable for the valve to have three positions so that the flow can be controlled in such a way that in one position each circuit is separate, in a second position the circuits are connected together in series and the radiator is part of the circuit, and in a third position the circuits are connected together in series but the radiator is bypassed.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
A method for cooling and warming: a refrigerant circuit (2) with at least a compressor (5), a liquid-cooled condenser (6), a liquid-heated evaporator (7) and two outer secondary liquid-based circuits (3,4). The first of those circuits includes (3) an element (13) situated in the space which is to be cooled or warmed, and which is operative for that purpose. The second circuit (4) includes a radiator operation to cool the liquid in the circuit. The two secondary circuits (3,4) are united, during heat pump operation, to form a common single circuit so that the condenser (6) heats liquid which is supplied to the element (13), with the result that the element (13) releases heat instead of cold, without the flows in the primary refrigerant circuit (2), in the element circuit (3) or in the radiator circuit (4) being alternated/reversed. A valve controlled bypass bypasses the radiator in that circuit.
Description
- The present invention relates generally to compressor systems which have closed refrigerant circuits for cooling and warming purposes and comprise at least a condenser and an evaporator. The invention relates more specifically to a method and a system for cooling or warming the interior of a vehicle and particularly the driving space of a commercial vehicle, e.g. vehicles with tiltable cabs. The invention relates in particular to compressor systems which comprise a liquid-cooled condenser and evaporator and have a low-pressure circuit for conveying hot or cold liquid to the driving space.
- Known air conditioning systems in vehicles usually comprise a compressor, an air-cooled condenser situated at or near the front of the vehicle, an evaporator situated somewhere in the vehicle's cab, e.g. in or under the instrument panel, and pipelines or hoses which connect these components together to form a hermetically sealed and pressurised system which usually also comprises an expansion means and a dry filter or an accumulator. A number of different gases may be used as refrigerant but R134a is often used in vehicle applications.
- Vehicles with tiltable cabs require longer hoses/lines and/or more connections to be able to connect the cooling element in the cab to other necessary parts of the cooling system which are usually situated in the vehicle's engine space. In such AC systems it is advantageous, and not unusual, that a further cooling loop, a so-called secondary loop, is used, i.e. that a further low-pressure cooling circuit with a liquid as thermal transfer medium is connected to the compressor system's evaporator via a liquid-based heat exchanger. The liquid, usually water or a mixture of water and glycol, is thus cooled in the refrigerant circuit's evaporator and is pumped up to the cab and to the cooling element therein situated, which in its turn cools the air of the cab by means of a fan. It is of course also possible to use other liquid-based coolants.
- An AC system of said kind is therefore normally used for cooling the air in the cab, while a separate water-borne heating system is used for warming the cab air as necessary. This separate system is usually supplied with hot water/cooling water from the vehicle's engine. When the engine has been switched off for a while, however, the cooling water will have cooled so much that it is no longer possible for any hot water to be pumped to the cab element, with the result that the cab air can no longer be kept warm. The engine in a heavy vehicle has a large mass which needs warming up and the cooling water volume alone may be up to 100 litres. Even after the engine has been started, it therefore takes quite a while before its cooling water reaches such a temperature that it can be used effectively for warming the cab air. When the engine runs at no load, the temperature of the cooling water may also drop so much that the water becomes unusable for warming purposes. For these reasons it is advantageous to use instead a heat pump which can produce heat quickly when the need arises. The refrigerant circuit in a compressor system usually generates cold and heat almost immediately after starting and with an outer cooling circuit containing only a few litres of liquid it is possible to begin producing heat/cold quickly, within the order of a few minutes.
- As it is desirable to keep down the number of components in a vehicle, for both economic and space reasons, it is advantageous if the pre-existing AC system can also be used as a heat pump. This can be done, for example, by reversing the flow in the refrigerant circuit. The problem with this is that reversing the refrigerant circuit, i.e. changing the direction of flow of the refrigerant, will not be fully effective, since a condenser functions less well as an evaporator and an evaporator functions less well as a condenser. The overall efficiency of the system will suffer.
- Various systems and solutions for warming, for example, a tiltable driving cab by an AC system which can also be run as a heat pump, are prior art.
- Specification WO2007/107535 refers to a system with two evaporators or condensers fitted in a vehicle cab. It is possible to choose whether none, one or more are to function as condensers and the others as evaporators. Thus the AC system may cool, warm or dry the air in the cab. The device will be relatively complicated and the flow will be alternated on the refrigerant side, i.e. in the pressurised refrigerant circuit.
- U.S. Pat. No. 6,928,831 describes an AC system with combined condenser/gas cooler and evaporator which is usable as both cooling system and heat pump in vehicles. A directional valve “118” connects together the units “141” and “142”. The engine's cooling water is used as heat source for the heat pump and the flow is alternated on the refrigerant side. That invention exhibits similarities with the aforesaid WO2007/107535.
- Prior art thus does not show how the compressor system in a vehicle can be used effectively for both cooling and warming of, for example, a driving cab.
- The object of the invention is to solve said problems and provide a method and a system for effective cooling and/or warming of, for example, a vehicle cab, using the same refrigerant for both and without alternating or reversing the flow in the refrigerant circuit.
- A further object of the invention is to keep down the number of components in the cooling/warming system and to provide a simple compact solution which is easy to accommodate in the vehicle.
- These said and further advantages are achieved according to the invention by a method and a system according to the features indicated in
claims - The invention is effected principally by the outer low-pressure circuits of the system being connected together so that the condenser of the refrigerant circuit warms liquid which is supplied to the element in the vehicle's driving space, and the evaporator of the refrigerant circuit cools liquid which is released from the element.
- The invention entails the refrigerant circuit, irrespective of whether cold or heat is to be supplied from the system and, for example, be transferred to the vehicle's driving space, being allowed to operate in a normal way whereby the condenser and the evaporator are used simply as condenser and evaporator irrespective of whether hot or cold water is to be produced. A condenser is in fact configured to function most effectively as a condenser, and an evaporator to function effectively as an evaporator.
- The invention also entails the possibility of the flows in the system's secondary circuits being switched between AC operation and heat pump operation in such a way that liquid which is heated by the refrigerant circuit's condenser can be pumped to the cab element instead of the liquid which is cooled in the refrigerant circuit's evaporator.
- The invention is achieved by the two secondary circuits being united, for heat pump operation, via a flow changeover switch, to form a common single circuit without changing the main direction of flow in any of the circuits.
- Further features and advantages of the invention are indicated by the more detailed description of the invention set out below and the attached drawings and other claims.
- The invention is described below in more detail in the form of some preferred embodiment examples with reference to the attached drawings.
-
FIG. 1 depicts schematically a compressor system according to the invention with two outer closed and separate liquid-based circuits for cooling and release of surplus heat respectively. -
FIG. 2 depicts schematically the compressor system according to the invention according toFIG. 1 but with the outer secondary circuits reconnected in series with one another with the object of being able to deliver heat instead of cold to the driving space. -
FIG. 3 depicts schematically the compressor system according to the invention according toFIG. 2 for heat pump operation whereby the low-pressure radiator is bypassed by means of an alternatively configured valve. -
FIG. 1 depicts acompressor system 1 according to the invention, connected for AC operation. Thecompressor system 1 comprises in this case three separate and distinct closed circuits, viz. theprimary refrigerant circuit 2, anelement circuit 3 and aradiator circuit 4. - The
primary refrigerant circuit 2 is a hermetically sealed circuit and operates with a refrigerant, a gas, under pressure. Therefrigerant circuit 2 comprises acompressor 5, acondenser 6, anevaporator 7, adry filter 8 and an expansion means 9, and the components are connected to one another by a hose system or pipeline system. Heat is released in thecondenser 6 and heat is absorbed in theevaporator 7. - Both the
evaporator 7 and thecondenser 6 are each co-assembled with their respective liquid-basedheat exchanger evaporator 7 is therefore heated by the liquid in theelement circuit 3 and thecondenser 6 is cooled by the liquid in theradiator circuit 4. - The
element circuit 3 comprises not only theheat exchanger 10 which is co-assembled with theevaporator 7 but also a first low-pressure pump 12 and anelement 13 and operates with liquid at relatively low pressure. Theelement 13 is situated in a space which is to be warmed or cooled, e.g. in the interior or cab of a vehicle. Air is blown through theelement 13 by an undepicted fan and the air which passes is warmed or cooled depending on the temperature of the liquid. The air in the cab is thus kept at, for example, a preset temperature. - The
radiator circuit 4 comprises a low-pressure pump 14, aheat exchanger 11 co-assembled with the refrigerant circuit'scondenser 6 and a low-temperature radiator 15. Theradiator 15 is usually air-cooled and situated near to the front of the vehicle where the draught caused by vehicle movement may help to create an air flow through theradiator 15 so that heat exchange to the environment can take place when the vehicle is in motion. The engine's fan system may also be used for blowing air through theradiator 15. - A
flow changeover switch 16, e.g. a two-position four-way valve 16 a, is adapted to controlling the coolant flows in thecompressor system 1. Thevalve 16 a may in this embodiment example be switched physically/manually between its two positions, against the action of aspring 17, or electromechanically via an undepicted electrical circuit-breaker situated on, for example, the vehicle's instrument panel. - The
valve 16 a is here depicted in a first functional position in which all of thecircuits respective circuits - The flow in the
refrigerant circuit 2 is provided by thecompressor 5 and passes from thecompressor 5 through thecondenser 6, in which heat is released, via thedry filter 8 and the expansion means 9 to theevaporator 7, in which heat is absorbed, and thereafter back to thecompressor 5. - The flow in the
element circuit 3 is provided by thepump 12 and passes from thepump 12 through theelement 13, which may for example be situated in the vehicle's cab, where heat is absorbed, and proceeds to theheat exchanger 10 which is integrated with the refrigerant circuit'sevaporator 7 and in which heat is released, and back to thepump 12 via thevalve 16 a. - The flow in the
radiator circuit 4 is provided by thepump 14 and passes via theheat exchanger 11 which is integrated with the refrigerant circuit'scondenser 6 and in which heat is absorbed, and proceeds via thevalve 16 a to theradiator 15, in which surplus heat is released to the environment. -
FIG. 2 depicts the same system as inFIG. 1 but with the flow changeover switch, thevalve 16 a, depicted in its second functional position, for heat pump operation, whereby the flow through thevalve 16 a is here crossed instead. The flow is thus changed so that the secondary circuits, viz. theelement circuit 3 and theradiator circuit 4 inFIG. 1 , are united to form a common single circuit. The components in the original two circuits here operate, as regards flow, in series with one another, and thepumps refrigerant circuit 2, however, is not affected at all, as the flow in it proceeds in a usual/normal manner. Nor is there any change in the direction of flow in the united circuit relative to the original flow of thecircuits valve 16 a carries a flow from thepump 14 through theheat exchanger 11, through thevalve 16 a and on to thepump 12, theelement 13, theheat exchanger 10 and again through thevalve 16 a to theradiator 15 and back to thepump 14. -
FIG. 3 depicts a further alternative embodiment of thecompressor system 1 according to the invention. If much power is extracted from theevaporator 7 when thecompressor system 1 is run as a heat pump, the coolant will become colder and the low pressure in therefrigerant circuit 2 will become low. In this situation, the coolant in theradiator 15 will be warmed, since it will be colder than the ambient temperature of theradiator 15. Low temperature results in low pressure and low mass flow in therefrigerant circuit 2, which is less good. If only a small amount of power is extracted from theevaporator 7, the low pressure may rise, with a corresponding rise in the high pressure in the refrigerant circuit. This will result in awarmer condenser 6 and warmer liquid leaving theheat exchanger 11, which is good if a vehicle cab needs warming. If on the contrary the liquid leaving theheat exchanger 10 of theevaporator 7 is warmer than the surroundings, the energy will be cooled away in theradiator 15. By bypassing theradiator 15, part of the energy in the system is thus retained and the pressure may gradually rise. Using another flow changeover switch, e.g. avalve 16 b comprising a further connection path, makes it possible to disconnect theradiator 15 from the circuit. In such cases, a hose or pipeline is connected from thevalve 16 b directly to the suction side of the radiator circuit'spump 14. Bypassing theradiator 15 makes it possible for the liquid to gradually warm up in order to raise the temperature after theheat exchanger 11 of thecondenser 6, thereby achieving more power in the system. Acheck valve 17 may possibly be used to prevent liquid from reaching theradiator 15 the back way. - When the liquid in the low-
pressure circuits circuits circuits - The invention is described above with respect to various preferred embodiments. The invention is of course not limited to those embodiments, which are only to be regarded as examples. Other variants of the invention are therefore also perfectly possible within the scope of protection under the attached claims. Thus it is possible that the refrigerant circuit may also comprise one or more internal heat exchangers. It is also possible for the evaporator and the condenser to be mutually co-assembled with the object of creating a compact unit which can supply both warm and cold liquid for cooling and heating purposes. The flow changeover switch may of course be configured in various ways for controlling the flows of the circuits. It is for example conceivable for the valve to have three positions so that the flow can be controlled in such a way that in one position each circuit is separate, in a second position the circuits are connected together in series and the radiator is part of the circuit, and in a third position the circuits are connected together in series but the radiator is bypassed.
Claims (11)
1. A system for selectively cooling or warming of a space, the system, comprising:
a refrigerant circuit including a compressor, a liquid-cooled condenser, and a liquid-heated evaporator;
an element circuit including an element configured for heating or cooling the space and situated in the space which is to be cooled or warmed;
a first heat exchanger in the element circuit and exchanging heat with the evaporator in the refrigerant circuit;
a radiator circuit separate from the element circuit, the radiator circuit including a radiator therein;
a second heat exchanger in the radiator circuit and exchanging heat with the condenser in the refrigerant circuit;
during air conditioning operation, the circuits constitute mutually separate circuits with respective flows in the circuits separated from one another;
a flow changeover switch including a valve connected to the element circuit and to the radiator circuit and configured such that in a first position of the changeover switch, the changeover switch flow connects the element circuit and the radiator circuit together for a single flow through the element circuit and the radiator circuit for heat pump operation so that the condenser of the refrigerant circuit warms liquid which is supplied to the element, and the evaporator of the refrigerant circuit cools liquid which is released from the element;
the radiator circuit including therein a bypass past the radiator;
the flow changeover switch being so configured and the bypass being so positioned with reference to the valve that in the first position of the switch, the valve directs the flow in the radiator circuit to bypass the radiator.
2. A system according to claim 1 , wherein
the flow changeover switch is configured such that in the first position thereof, the changeover switch connects the element circuit and the radiator circuit together for heat pump operation so that they form a single circuit with a common flow.
3. A system according to claim 2 , wherein the element circuit is configured to act as a heat pump; and
in that the element is configured to release heat during heat pump operation, with no change in the direction of flow in the refrigerant circuit.
4. A system according to claim 2 , further comprising a pump in each of the element circuit and the radiator circuit for pumping flow through the respective circuit; and
the element is adapted configured to release heat during heat pump operation with no changes in the directions of flow through the compressor and pumps in each of the element circuit and the radiator circuit.
5. A system according to claim 2 , wherein
the flow changeover switch is adapted configured such that in the first position of the changeover switch and during heat pump operation, the changeover switch connects in series the element circuit and the radiator circuit.
6. A system according to claim 1 , wherein
the valve is of the two-position four-way type.
7. A system for selectively cooling or warming of a space, the system, comprising:
a refrigerant circuit including a compressor, a liquid-cooled condenser, and a liquid-heated evaporator;
an element circuit including an element configured for heating or cooling the space and situated in the space which is to be cooled or warmed;
a radiator circuit including a radiator therein;
the refrigerant circuit, the element circuit and the radiator circuit being mutually separate circuits with respective flow in each of the circuits separated from the flow in the other circuits;
the refrigerant circuit and the element circuit being positioned with respect to each other so that the temperature in one of them causes a change in the temperature in the other;
the refrigerant circuit and the radiator circuit being positioned with respect to each other so that the temperature in one of them causes a temperature change in the other;
the circuits being mutually separate from each other;
a flow changeover switch including a valve connected to the element circuit and to the radiator circuit, the valve being configured such that in a first position of the changeover switch valve, the changeover switch valve flow connects the element circuit and the radiator circuit together for providing a single flow through the element circuit and the radiator circuit for heat pump operation so that the condenser of the refrigerant circuit warms liquid which is supplied to the element and the evaporator of the refrigerant circuit cools liquid which is released from the element;
a bypass circuit for bypassing the radiator in the radiator circuit, the bypass circuit including an entry for being connected with the changeover switch valve for receiving flow through the valve, the bypass circuit including an outlet communicating into the radiator circuit at a location downstream in flow through the radiator circuit from the radiator, whereby flow through the bypass circuit bypasses the radiator and then enters the radiator circuit.
8. A system according to claim 7 , wherein the circuits being separate comprises the changeover switch valve having a second position at which the valve is configured to permit flow through each of the element circuit and the radiator circuit respectively without permitting flow into the other of the element and the radiator circuit.
9. A system according to claim 7 , wherein the element circuit is configured to act as a heat pump; and the element is configured to release heat during heat pump operation, with no change in the direction of flow in the refrigerant circuit.
10. A system according to claim 8 , further comprising a pump in each of the element circuit and the radiator circuit for pumping flow through the respective circuit; and the element is configured to release heat during heat pump operation with no changes in the directions of flow through the compressor and the pumps in each of the element circuit and the radiator circuit.
11. A system according to claim 8 , wherein the flow changeover switch is configured such that in the first position of the changeover switch and during heat pump operation, the changeover switch connects in series the element circuit and the radiator circuit.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0850045A SE533005C2 (en) | 2008-10-21 | 2008-10-21 | Method and system for cooling and heating |
SE0850045-6 | 2008-10-21 | ||
PCT/SE2009/051182 WO2010047649A1 (en) | 2008-10-21 | 2009-10-19 | Method and system for cooling and warming |
Publications (1)
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US20110197611A1 true US20110197611A1 (en) | 2011-08-18 |
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ID=42119516
Family Applications (1)
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US13/124,700 Abandoned US20110197611A1 (en) | 2008-10-21 | 2009-10-19 | Method and system for cooling and warming |
Country Status (9)
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US (1) | US20110197611A1 (en) |
EP (1) | EP2349757B1 (en) |
JP (1) | JP2012505796A (en) |
KR (1) | KR101257888B1 (en) |
CN (1) | CN102196931B (en) |
BR (1) | BRPI0914443B1 (en) |
RU (1) | RU2472643C1 (en) |
SE (1) | SE533005C2 (en) |
WO (1) | WO2010047649A1 (en) |
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WO2019203675A1 (en) * | 2018-04-19 | 2019-10-24 | Privredno Drustvo za Pruzanje Usluga iz Oblasti Automatike i Programiranja Synchrotek D.o.o. | Vehicle thermal management system |
US20210016627A1 (en) * | 2018-05-28 | 2021-01-21 | Sanden Automotive Climate Systems Corporation | Vehicle air conditioning apparatus |
US11518216B2 (en) * | 2018-05-28 | 2022-12-06 | Sanden Automotive Climate Systems Corporation | Vehicle air conditioning apparatus |
US20210252940A1 (en) * | 2018-09-03 | 2021-08-19 | Hanon Systems | Thermal management arrangement for vehicles and method for operating a thermal management arrangement |
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Also Published As
Publication number | Publication date |
---|---|
KR20110074553A (en) | 2011-06-30 |
EP2349757B1 (en) | 2014-12-03 |
BRPI0914443B1 (en) | 2020-02-11 |
BRPI0914443A2 (en) | 2015-10-27 |
KR101257888B1 (en) | 2013-04-23 |
RU2472643C1 (en) | 2013-01-20 |
JP2012505796A (en) | 2012-03-08 |
EP2349757A4 (en) | 2013-02-13 |
CN102196931A (en) | 2011-09-21 |
WO2010047649A1 (en) | 2010-04-29 |
RU2011120454A (en) | 2012-11-27 |
SE533005C2 (en) | 2010-06-08 |
CN102196931B (en) | 2014-01-08 |
SE0850045A1 (en) | 2010-04-22 |
EP2349757A1 (en) | 2011-08-03 |
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