WO1999010191A1 - Automotive air conditioning device with thermoelectric elements and pwm control circuit - Google Patents

Automotive air conditioning device with thermoelectric elements and pwm control circuit Download PDF

Info

Publication number
WO1999010191A1
WO1999010191A1 PCT/BR1998/000061 BR9800061W WO9910191A1 WO 1999010191 A1 WO1999010191 A1 WO 1999010191A1 BR 9800061 W BR9800061 W BR 9800061W WO 9910191 A1 WO9910191 A1 WO 9910191A1
Authority
WO
WIPO (PCT)
Prior art keywords
air conditioning
pwm
thermoelectric elements
cell
electronic circuit
Prior art date
Application number
PCT/BR1998/000061
Other languages
French (fr)
Inventor
Eloir Fernando Protasiewytch
Original Assignee
Eloir Fernando Protasiewytch
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BR9702791-0A priority Critical patent/BR9702791A/en
Priority to BRPI9702791-0 priority
Application filed by Eloir Fernando Protasiewytch filed Critical Eloir Fernando Protasiewytch
Publication of WO1999010191A1 publication Critical patent/WO1999010191A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00478Air-conditioning devices using the Peltier effect

Abstract

There is described a new automotive apparatus to provide air conditioning, this device being equipped with thermoelectric elements controlled by a Pulse With Modulation (PWM) electronic circuit, replacing the conventional gas compression systems, avoiding the environmental problems caused by leakage of refrigerant gases and allowing the construction of apparatus more simple, less expensive and providing better performance. The new device is composed by one Peltier cell (1) disposed in a wall of an air duct (3), the 'cold' face of this cell being on the inside of the duct (3) and showing a plated thermal exchanger (2), while the other face ('warm') is on the outside and presents a second, external, plated thermal exchanger (4), air-cooled or water-cooled, said cell being electrically connected to an electronic circuit board (5) which has a Pulse With Modulation (PWM) circuit. High power air conditioning devices may present a single PWM electronic circuit board (5) which controls two or more Peltier cells (1), all disposed in the air duct wall (3) as described above, allowing the construction of power air conditioning devices.

Description

" AUTOMOTIVE AIR CONDITIONING DEVICE WITH THERMOELECTRIC ELEMENTS AND PWM CONTROL CIRCUIT ".

This patent describes a new apparatus especially developed to provide air conditioning to a car or other similar vehicle, this device being equipped with thermoelectric elements controlled by a Pulse With Modulation ( PWM ) electronic circuit, replacing the conventional gas compression systems, avoiding the environmental problems caused by leakage of refrigerant gases and allowing the construction of apparatus more simple, less expensive and providing better performance. The air conditioning system has the purpose of control the air environment inside a building or vehicle. A complete air-conditioning unit controls the temperature and humidity of the air, removes dust and odors from it, and circulates it by means of a fan.

There are many kinds of air conditioner, but their functions are essentially the same. Usually, the air in an air conditioner is cooled by a type of refrigeration unit comprising a compressor and a condenser.

Refrigeration air conditioners compress their refrigerant fluids with a mechanical compressor system. These compressor-type air conditioners circulate a refrigerant fluid in a closed tube system, compressing it, exhausting the heat the compression creates, and expanding the fluid. Warm interior air is circulated over the coil that contains the refrigerant which becomes a cool vapor as it expands The cool vapor removes heat from the air and the cooled air is returned to the interior. The refrigerant is compressed and its heat exhausted to the exterior again. These apparatus are expensive, complex and relatively heavy, a strong handicap against their automotive use.

On the other side, leakage of the refrigerant gas is a common phenomena. Normally the gas used is the chlorofluorocarbon ( or " CFC "), a synthetic chemical that is odorless, nontoxic, nonflammable, and chemically inert, partly responsible for the destruction of the ozone layer.

The air conditioning devices equipped with these gas compression units usually don't present reliable means to adjust the temperature of the air at the outlet of the device. Thus, is quite impossible to optimize the air parameters inside the vehicle.

The main object of this patent is to provide a new air conditioning apparatus for automotive application, which refrigeration systems is based on the Peltier Effect, controlled by a new Pulse With Modulation ( PWM ) electronic circuit, replacing the " old " compression gas system and providing higher efficiency, more reliability and a lower cost of assemblage and maintenance.

Other object of this patent is to provide an electronic control panel operated by the driver and passengers on the vehicle, allowing them to choose the desired temperature of the air provided by the new air conditioning apparatus.

All the automotive devices constructed using the new system don't have any movable parts using thermoelectric cells, and are lighter and smaller than traditional automotive air conditioning apparatus.

In the middle of the last century, the French physicist Jean Peltier discovered that when ant electric current flows through a circuit in which two different metals are joined, one side of the junction gets cooler, and the other gets warmer. This effect can be enhanced by substituting certain semiconductor materials for the metals.

A thermoelectric air conditioning device has a refrigeration system made by placing many junctions in series, separated by a plate, so that heat is absorbed on one side and dissipated on the other.

As a result of the particular performance curve of these thermoelectric cells, whose the higher efficiency voltage differs widely of the maximum tension supported, they necessarily should work within a narrow optimized power range, otherwise the overall performance of the system will decrease, causing the overheating of the cell.

When a low frequency current flows across these thermoelectric elements, it occurs a thermal exchange between the two faces of the Peltier cell, decreasing the thermal gradient obtained. How a simple potential regulator doesn't prevent the cell overheating, the author, based on exhaustive laboratory research, developed a Pulse With Modulation ( PWM )control circuit, which purpose is to maintain frequency and tension of the Peltier cells on the optimized ranges, while the work cycle varies in according with the required thermal power.

Thus, the PWM circuit may establish a control cycle on which there is a electric current flowing across the Peltier cell during 80% of the time, and along the remainder 20% the thermoelectric cell became inactive. If the requested thermal power is reduced, the circuit changes the cycle, adjusting the time when current flows to a new parameter ( for instance: by 50% of total time a current crossing the cell, and by the other 50% the cell is inactive ).

This PWM circuit is self-adjustable, but it may also presents a external operated control, allowing to obtain predetermined operation parameters.

The new automotive air conditioning device is composed by one or more Peltier cell disposed in a wall of an air duct, the " cold " face of this cell being on the inside of the duct and showing a heat exchanger, while the other face ( "warm ") is on the outside and presents a second, external, heat exchanger, air-cooled or water-cooled. The said cell is electrically connected to a electronic circuit board, which has a Pulse-With-Modulation ( PWM ) circuit comprising a pulse generator, a cycle controller and three power modules that provide electric current respectively for the Peltier cell, a water pump and a refrigeration fan - if the device has an independent water cooling circuit - said circuit board being energized by continuous current provided by the vehicle electrical system, the electronic circuit presenting an microprocessor which receives the feedback signals from two temperature sensors. These sensors measures respectively the external and internal temperatures of the vehicle. The refrigeration device presents an alphanumeric keyboard and a digital display connected to the microprocessor, allowing passengers to set the desired air temperature.

A single PWM electronic circuit can control one or more Peltier cells, all disposed in the air duct wall as described above, allowing the construction of high power air conditioning devices.

For better understanding of the invention, the drawings referred below show the essential characteristics of a device equipped with the new electronic circuit, as described bellow: Fig. 1 : schematic drawing of an automotive air conditioning device constructed according with this patent;

Fig. 2: simplified block diagram of the PWM electronic circuit used in the device showed at figure 1 In according with the drawings, the invention is a new automotive air conditioning device composed by one Peltier cell ( 1 ) disposed in a wall of an air duct ( 3 ), the " cold " face of this cell being on the inside of the duct ( 3 ) and showing a heat exchanger ( 2 ), while the other face ( "warm ") is on the outside and presents a second, external, heat exchanger ( 4 ), air-cooled or water- cooled, said cell being electrically connected to a electronic circuit board ( 5 ) which has a pulse-with-modulation ( PWM ) circuit comprising a pulse generator ( 6 ), a cycle controller ( 7 ) and three power modules ( 8 ), ( 9 ) and ( 10 ), providing electric current respectively for the Peltier cell ( 1 ), a water pump ( 11 ) and a refrigeration fan ( 12 ), if the device has an independent water cooling circuit, said circuit board ( 5 ) being energized by continuous current provided by the battery ( 13 ) of the vehicle electric system, the electronic circuit presenting an microprocessor ( 14 ) which receives the feedback signals from two temperature sensors ( 15 ) and ( 16 ), said sensors measuring respectively the external and internal temperatures of the vehicle, the refrigeration device presenting a alphanumeric keyboard ( 17 ) and a digital display ( 18 ) connected to microprocessor ( 14 ), being positioned on the instrument panel of the car, allowing passengers to set the desired air temperature.

High power air conditioning devices may present a single PWM electronic circuit board ( 5 ) which controls two or more Peltier cells ( 1 ), all disposed in the air duct wall ( 3 ) as described above, allowing the construction of power air conditioning devices.

All automotive air conditioning apparatus equipped with thermoelectric elements and an PMW electronic control circuit, like the apparatus above described, differing only by their design, materials, size or other secondary characteristics, will be attached to he scope of this patent.

Claims

1) " AUTOMOTIVE AIR CONDITIONING DEVICE WITH THERMOELECTRIC ELEMENTS AND PWM CONTROL CIRCUIT ", replacing the traditional compressed gas refrigeration system, this new device being characterized by present one Peltier cell ( 1 ) disposed in a wall of an air duct ( 3 ), the " cold " face of this cell being on the inside of the duct ( 3 ) and showing a plated thermal exchanger ( 2 ), while the other face ( "warm ") is on the outside and presents a second, external, plated thermal air-cooled exchanger ( 4 ), said cell being electrically connected to a electronic circuit board ( 5 ) energized by continuous current provided by the battery ( 13 ) of the vehicle electric system.
2) " AUTOMOTIVE AIR CONDITIONING DEVICE WITH THERMOELECTRIC ELEMENTS AND PWM CONTROL CIRCUIT ", according with first claim, the electronic circuit board ( 5 ) being characterized by have a pulse-with-modulation ( PWM ) circuit comprising a pulse generator ( 6 ), a cycle controller ( 7 ) and one power module ( 8 ) providing electric current respectively for the Peltier cell ( 1 ).
3) " AUTOMOTIVE AIR CONDITIONING DEVICE WITH THERMOELECTRIC ELEMENTS AND PWM CONTROL CIRCUIT ", according with claims 1 and 2, this device being characterized by present a second version which uses an independent water or other cooling circuit for the external plated thermal exchanger ( 4 ), in this case the PWM electronic circuit having more two power modules (9) and (10), providing electric current respectively for a water pump ( 11 ) and a refrigeration fan ( 12 ). 4) "AUTOMOTIVE AIR CONDITIONING DEVICE WITH
THERMOELECTRIC ELEMENTS AND PWM CONTROL CIRCUIT", in accordance with the precedent claims, the PWM electronic circuit being characterized by showing an microprocessor ( 14 ) which receives the feedback signals from two temperature sensors ( 15 ) and ( 16 ), said sensors measuring respectively the external and internal temperatures of the vehicle.
5) "AUTOMOTIVE AIR CONDITIONING DEVICE WITH THERMOELECTRIC ELEMENTS AND PWM CONTROL CIRCUIT ", according with precedent claims, these new device being characterized by have an alphanumeric or other keyboard ( 17 ) and a digital display ( 18 ) connected to microprocessor ( 14 ) and both positioned on the instruments panel of the car, allowing passengers to set the desired air temperature.
6) " AUTOMOTIVE AIR CONDITIONING DEVICE WITH THERMOELECTRIC ELEMENTS AND PWM CONTROL CIRCUIT ", in accordance with claims 1 and 2, this device being c h a r a c t e ri z e d by have a high power air version, which presents a single PWM electronic circuit board ( 5 ) which controls one or more Peltier cells ( 1 ), all disposed in the air duct wall ( 3 ) as described above, allowing the construction of power air conditioning devices.
PCT/BR1998/000061 1997-08-27 1998-08-25 Automotive air conditioning device with thermoelectric elements and pwm control circuit WO1999010191A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR9702791-0A BR9702791A (en) 1997-08-27 1997-08-27 Apparatus automotive air conditioning generator with cooling electronic circuit
BRPI9702791-0 1997-08-27

Publications (1)

Publication Number Publication Date
WO1999010191A1 true WO1999010191A1 (en) 1999-03-04

Family

ID=4067292

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR1998/000061 WO1999010191A1 (en) 1997-08-27 1998-08-25 Automotive air conditioning device with thermoelectric elements and pwm control circuit

Country Status (2)

Country Link
BR (1) BR9702791A (en)
WO (1) WO1999010191A1 (en)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003016081A1 (en) * 2001-08-14 2003-02-27 Krzysztof Sobarnia Electronic air conditioner
EP1388444A1 (en) * 2002-08-07 2004-02-11 Peugeot Citroen Automobiles SA Air conditioning system
EP1726462A1 (en) 2005-05-27 2006-11-29 Valeo Systemes Thermiques Stand alone air conditioning module in particular for thermal treatment of a region in a passenger compartment of a vehicle
DE102005022656B4 (en) * 2004-05-10 2007-05-03 Visteon Global Technologies, Inc., Van Buren Township Climate control system for hybrid vehicles using thermoelectric devices
US7246496B2 (en) 2005-07-19 2007-07-24 Visteon Global Technologies, Inc. Thermoelectric based heating and cooling system for a hybrid-electric vehicle
DE102006042160A1 (en) * 2006-09-06 2008-03-27 Visteon Global Technologies Inc., Van Buren Heating ventilation and air conditioning system for e.g. hybrid-electric vehicle, has control system receiving electric pulse generated by vehicle and directing pulse to one of thermoelectric modules and thermal storage device
US20100050659A1 (en) * 2008-08-27 2010-03-04 Tony Quisenberry Vehicle air comfort system and method
DE102008062269A1 (en) * 2008-12-15 2010-06-17 GM Global Technology Operations, Inc., Detroit Air conditioning system for regulating air conditioning in interior space of motor vehicle, has evaporator and air conditioning unit coupled with each other by heat exchanging unit that is designed for heat exchange by thermal conduction
DE102010002018A1 (en) * 2010-02-17 2011-08-18 Behr GmbH & Co. KG, 70469 A heating system for electrically powered vehicle and operating procedures
DE102012019005A1 (en) 2011-09-30 2013-04-04 Audi Ag Thermal conditioning of a, in particular an electric drive motor vehicle having
CN103158496A (en) * 2011-12-08 2013-06-19 福特全球技术公司 Equipment for improving energy efficiency of motor vehicle
US8516832B2 (en) 2010-08-30 2013-08-27 B/E Aerospace, Inc. Control system for a food and beverage compartment thermoelectric cooling system
US8915091B2 (en) 2005-04-08 2014-12-23 Gentherm Incorporated Thermoelectric-based thermal management system
US8974942B2 (en) 2009-05-18 2015-03-10 Gentherm Incorporated Battery thermal management system including thermoelectric assemblies in thermal communication with a battery
US9006557B2 (en) 2011-06-06 2015-04-14 Gentherm Incorporated Systems and methods for reducing current and increasing voltage in thermoelectric systems
US9038400B2 (en) 2009-05-18 2015-05-26 Gentherm Incorporated Temperature control system with thermoelectric device
US9103573B2 (en) 2006-08-02 2015-08-11 Gentherm Incorporated HVAC system for a vehicle
US9293680B2 (en) 2011-06-06 2016-03-22 Gentherm Incorporated Cartridge-based thermoelectric systems
US9306143B2 (en) 2012-08-01 2016-04-05 Gentherm Incorporated High efficiency thermoelectric generation
US9310112B2 (en) 2007-05-25 2016-04-12 Gentherm Incorporated System and method for distributed thermoelectric heating and cooling
US9435553B2 (en) 2009-08-27 2016-09-06 Thermotek, Inc. Method and system for maximizing thermal properties of a thermoelectric cooler and use therewith in association with hybrid cooling
US9447994B2 (en) 2008-10-23 2016-09-20 Gentherm Incorporated Temperature control systems with thermoelectric devices
US9555686B2 (en) 2008-10-23 2017-01-31 Gentherm Incorporated Temperature control systems with thermoelectric devices
US9719701B2 (en) 2008-06-03 2017-08-01 Gentherm Incorporated Thermoelectric heat pump
US10270141B2 (en) 2013-01-30 2019-04-23 Gentherm Incorporated Thermoelectric-based thermal management system
US10359216B2 (en) 2017-06-20 2019-07-23 Thermotek, Inc. Vehicle air comfort system and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3138934A (en) * 1962-11-19 1964-06-30 Kysor Industrial Corp Thermoelectric heating and cooling system for vehicles
US3817043A (en) * 1972-12-07 1974-06-18 Petronilo C Constantino & Ass Automobile air conditioning system employing thermoelectric devices
GB2241378A (en) * 1990-02-27 1991-08-28 Robert Forsyth Portable electronic air-conditioner
DE4207283A1 (en) * 1992-03-07 1993-09-09 Webasto Karosseriesysteme Cooling device for interior of car - has flap allowing fan to draw blow exterior or interior air past peltier cold generator in roof
DE19549185A1 (en) * 1995-12-30 1997-07-03 Ekkehard Finkeissen Compact air-conditioning unit for automobile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3138934A (en) * 1962-11-19 1964-06-30 Kysor Industrial Corp Thermoelectric heating and cooling system for vehicles
US3817043A (en) * 1972-12-07 1974-06-18 Petronilo C Constantino & Ass Automobile air conditioning system employing thermoelectric devices
GB2241378A (en) * 1990-02-27 1991-08-28 Robert Forsyth Portable electronic air-conditioner
DE4207283A1 (en) * 1992-03-07 1993-09-09 Webasto Karosseriesysteme Cooling device for interior of car - has flap allowing fan to draw blow exterior or interior air past peltier cold generator in roof
DE19549185A1 (en) * 1995-12-30 1997-07-03 Ekkehard Finkeissen Compact air-conditioning unit for automobile

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003016081A1 (en) * 2001-08-14 2003-02-27 Krzysztof Sobarnia Electronic air conditioner
EP1388444A1 (en) * 2002-08-07 2004-02-11 Peugeot Citroen Automobiles SA Air conditioning system
FR2843446A1 (en) * 2002-08-07 2004-02-13 Peugeot Citroen Automobiles Sa air conditioning system, especially for motor vehicle
DE102005022656B4 (en) * 2004-05-10 2007-05-03 Visteon Global Technologies, Inc., Van Buren Township Climate control system for hybrid vehicles using thermoelectric devices
US9365090B2 (en) 2004-05-10 2016-06-14 Gentherm Incorporated Climate control system for vehicles using thermoelectric devices
US9863672B2 (en) 2005-04-08 2018-01-09 Gentherm Incorporated Thermoelectric-based air conditioning system
US8915091B2 (en) 2005-04-08 2014-12-23 Gentherm Incorporated Thermoelectric-based thermal management system
EP1726462A1 (en) 2005-05-27 2006-11-29 Valeo Systemes Thermiques Stand alone air conditioning module in particular for thermal treatment of a region in a passenger compartment of a vehicle
FR2886217A1 (en) * 2005-05-27 2006-12-01 Valeo Systemes Thermiques autonomous air conditioning module especially intended for heat treatment of an area of ​​the interior of a vehicle
US7246496B2 (en) 2005-07-19 2007-07-24 Visteon Global Technologies, Inc. Thermoelectric based heating and cooling system for a hybrid-electric vehicle
US9103573B2 (en) 2006-08-02 2015-08-11 Gentherm Incorporated HVAC system for a vehicle
DE102006042160A1 (en) * 2006-09-06 2008-03-27 Visteon Global Technologies Inc., Van Buren Heating ventilation and air conditioning system for e.g. hybrid-electric vehicle, has control system receiving electric pulse generated by vehicle and directing pulse to one of thermoelectric modules and thermal storage device
DE102006042160B4 (en) * 2006-09-06 2011-05-26 BSST, LLC, Irwindale Thermoelectric heating and cooling system for a hybrid vehicle
US9366461B2 (en) 2007-05-25 2016-06-14 Gentherm Incorporated System and method for climate control within a passenger compartment of a vehicle
US9310112B2 (en) 2007-05-25 2016-04-12 Gentherm Incorporated System and method for distributed thermoelectric heating and cooling
US9719701B2 (en) 2008-06-03 2017-08-01 Gentherm Incorporated Thermoelectric heat pump
US9719703B2 (en) 2008-08-27 2017-08-01 Thermotek, Inc. Vehicle air comfort system and method
US8839633B2 (en) 2008-08-27 2014-09-23 Thermotek, Inc. Vehicle air comfort system and method
US8443613B2 (en) 2008-08-27 2013-05-21 Thermotek, Inc. Vehicle air comfort system and method
US20100050659A1 (en) * 2008-08-27 2010-03-04 Tony Quisenberry Vehicle air comfort system and method
US9555686B2 (en) 2008-10-23 2017-01-31 Gentherm Incorporated Temperature control systems with thermoelectric devices
US9447994B2 (en) 2008-10-23 2016-09-20 Gentherm Incorporated Temperature control systems with thermoelectric devices
DE102008062269A1 (en) * 2008-12-15 2010-06-17 GM Global Technology Operations, Inc., Detroit Air conditioning system for regulating air conditioning in interior space of motor vehicle, has evaporator and air conditioning unit coupled with each other by heat exchanging unit that is designed for heat exchange by thermal conduction
US9038400B2 (en) 2009-05-18 2015-05-26 Gentherm Incorporated Temperature control system with thermoelectric device
US9666914B2 (en) 2009-05-18 2017-05-30 Gentherm Incorporated Thermoelectric-based battery thermal management system
US10106011B2 (en) 2009-05-18 2018-10-23 Gentherm Incorporated Temperature control system with thermoelectric device
US8974942B2 (en) 2009-05-18 2015-03-10 Gentherm Incorporated Battery thermal management system including thermoelectric assemblies in thermal communication with a battery
US9435553B2 (en) 2009-08-27 2016-09-06 Thermotek, Inc. Method and system for maximizing thermal properties of a thermoelectric cooler and use therewith in association with hybrid cooling
US10215454B2 (en) 2009-08-27 2019-02-26 Thermotek, Inc. Method and system for maximizing the thermal properties of a thermoelectric cooler and use therewith in association with hybrid cooling
DE102010002018A1 (en) * 2010-02-17 2011-08-18 Behr GmbH & Co. KG, 70469 A heating system for electrically powered vehicle and operating procedures
US8516832B2 (en) 2010-08-30 2013-08-27 B/E Aerospace, Inc. Control system for a food and beverage compartment thermoelectric cooling system
US9293680B2 (en) 2011-06-06 2016-03-22 Gentherm Incorporated Cartridge-based thermoelectric systems
US9006557B2 (en) 2011-06-06 2015-04-14 Gentherm Incorporated Systems and methods for reducing current and increasing voltage in thermoelectric systems
WO2013045089A1 (en) 2011-09-30 2013-04-04 Volkswagen Aktiengesellschaft Thermal conditioning of a motor vehicle which, in particular, has an electric drive
DE102012019005A1 (en) 2011-09-30 2013-04-04 Audi Ag Thermal conditioning of a, in particular an electric drive motor vehicle having
CN103158496A (en) * 2011-12-08 2013-06-19 福特全球技术公司 Equipment for improving energy efficiency of motor vehicle
US9306143B2 (en) 2012-08-01 2016-04-05 Gentherm Incorporated High efficiency thermoelectric generation
US10270141B2 (en) 2013-01-30 2019-04-23 Gentherm Incorporated Thermoelectric-based thermal management system
US10359216B2 (en) 2017-06-20 2019-07-23 Thermotek, Inc. Vehicle air comfort system and method

Also Published As

Publication number Publication date
BR9702791A (en) 2000-05-16

Similar Documents

Publication Publication Date Title
US6370903B1 (en) Heat-pump type air conditioning and heating system for fuel cell vehicles
EP2497662B1 (en) Heat pump system for vehicle
JP4257363B2 (en) At least one of the enclosures of passive and active cooling system for the apparatus and method
CN101305251B (en) Refrigeration system and its operation method, method for adjusting space temperature of the refrigeration system
Riffat et al. Comparative investigation of thermoelectric air-conditioners versus vapour compression and absorption air-conditioners
US5220809A (en) Apparatus for cooling an air conditioning system electrical controller
US6393842B2 (en) Air conditioner for individual cooling/heating
US6434960B1 (en) Variable speed drive chiller system
CN1109854C (en) Air conditioning method in machine room having forced air-cooling equipment housed therein
EP1202005B1 (en) Outdoor heat exchanger unit, outdoor unit, and gas heat pump type air conditioner
US20060060340A1 (en) Exchanging device for motor vehicles
US20050103487A1 (en) Vapor compression system for heating and cooling of vehicles
US4918936A (en) Refrigerating cycle utilizing cold accumulation material
KR100477305B1 (en) Air conditioner with ejector cycle system
US6612365B1 (en) Heating-element accommodating-box cooling apparatus and method of controlling the same
US6560980B2 (en) Method and apparatus for controlling evaporator and condenser fans in a refrigeration system
US6516623B1 (en) Vehicular heat pump system and module therefor
US20020046570A1 (en) Heat pump cycle having internal heat exchanger
EP1677059A2 (en) Hybrid cooling system, and refrigerator and freezer using the same
US6966197B2 (en) Air conditioner with dehumidifying and heating operation
KR100635904B1 (en) Air-conditioning apparatus
US6997006B2 (en) Cooling device
US6058712A (en) Hybrid air conditioning system and a method therefor
US5862675A (en) Electrically-driven cooling/heating system utilizing circulated liquid
US20100000713A1 (en) Vehicle air conditioning system

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA CN JP KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase in:

Ref country code: KR

NENP Non-entry into the national phase in:

Ref country code: CA

122 Ep: pct application non-entry in european phase