WO2006082082A1 - Systeme de climatisation pour vehicule automobile - Google Patents

Systeme de climatisation pour vehicule automobile Download PDF

Info

Publication number
WO2006082082A1
WO2006082082A1 PCT/EP2006/000968 EP2006000968W WO2006082082A1 WO 2006082082 A1 WO2006082082 A1 WO 2006082082A1 EP 2006000968 W EP2006000968 W EP 2006000968W WO 2006082082 A1 WO2006082082 A1 WO 2006082082A1
Authority
WO
WIPO (PCT)
Prior art keywords
refrigerant compressor
air
engine
standstill
refrigerant
Prior art date
Application number
PCT/EP2006/000968
Other languages
German (de)
English (en)
Inventor
Alfred Jeckel
Original Assignee
Daimlerchrysler Ag
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
Application filed by Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2006082082A1 publication Critical patent/WO2006082082A1/fr

Links

Classifications

    • 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
    • B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
    • B60H1/00764—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models the input being a vehicle driving condition, e.g. speed
    • B60H1/00778—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models the input being a vehicle driving condition, e.g. speed the input being a stationary vehicle position, e.g. parking or stopping
    • 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
    • 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
    • B60H1/3222—Cooling devices using compression characterised by the compressor driving arrangements, e.g. clutches, transmissions or multiple drives
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors

Definitions

  • the present invention relates to an air conditioning system for a motor vehicle according to the preamble of claim 1.
  • the air conditioner has at least one refrigerant circuit.
  • the refrigerant flow is in this case usually generated by a compressor connected in the refrigerant circuit, which is directly driven by the vehicle engine.
  • a state in which the vehicle engine is not in operation, is in the so-called idle-stop operation, by means of which the fuel consumption can be reduced is to be brought by the engine temporarily to a halt, for example, when stopping at a traffic light.
  • German Patent Application DE 103 08 254 A1 may be mentioned, in which an adaptive control system for the air flow through an evaporator and for the air intake from the outside is used, in order to use as long and independently as possible the cold storage effect of the evaporator even during a motor standstill ,
  • this procedure only works if the engine has already been commissioned in advance.
  • DE 102 004 008 133 A1 discloses an air conditioning system which proposes an auxiliary unit for driving the supply units of the air conditioning system for carrying out an air conditioning operation when the vehicle is parked.
  • DE 102 004 041 161 A1 discloses various operating strategies for switching an air conditioning cooling of a vehicle with start-stop operation.
  • the core of the invention is therefore that in the at least one refrigerant circuit of the air conditioning, a refrigerant compressor is integrated, which is electrically controlled and operated at a standstill of the engine, especially before driving.
  • the power is supplied by additional batteries, preferably lead-acid batteries, which are recharged by a regular generator in belt operation with the engine running.
  • This allows operation of the refrigerant compressor, and hence the air conditioning system, independent of engine operation.
  • such an air conditioner has a control unit which, at least as a function of the temperature prevailing in the passenger compartment, activates the refrigerant compressor when the engine is at a standstill before driving. It is advantageously provided that the refrigerant compressor is controlled above a comfort value for the vehicle cabin when the vehicle is stationary or unused.
  • This temperature value can be variable depending on the vehicle condition.
  • the temperature value of a vehicle parked longer may be higher than that of a vehicle that was parked for a short time.
  • an air conditioner with such a controlled refrigerant compressor it is possible to restrict the operation and thereby conserve the energy storage necessary for the operation.
  • An embodiment of the air conditioner further comprises at least one device for heating the air to be introduced at standstill of the engine before driving and / or at least one device for ventilating the passenger compartment by introducing outside air when the engine is at rest before driving.
  • the device for heating the air to be introduced into the cabin enables the vehicle cab to be conditionally conditioned at high and low outside temperatures.
  • the air in the reheat operation can also be dehumidified.
  • the device for heating the air can act on the existing electrically operated refrigerant compressor, possibly in heat pump mode.
  • a control device which activates the respective device or the electric refrigerant compressor as a function of the prevailing temperature in the passenger compartment.
  • the ventilation device of the vehicle at greatly elevated temperatures of the refrigerant compressor and at a low temperature, the heater is controlled.
  • the stationary air conditioning mode heating, ventilation, cooling can change.
  • the pre-air conditioning is possible via a remote control, a switch in the control panel or a switch-on time that can be programmed in an associated control unit.
  • the remote control can act, for example, via infrared transmitter and receiver or via radio.
  • the remote control can act combined on a stationary air conditioning, ventilation and an optionally existing auxiliary heater, wherein an activation function may be depending on other parameters such as the cabin temperature either a ventilation function, a parking heater function or the air conditioning function.
  • the remote control can cause a direct activation of the devices for ventilation, heating and / or cooling, can cause a time- or parameter-controlled, such as temperature-dependent activation or transfer an activation time ü.
  • a mechanically operated refrigerant compressor is integrated in the refrigerant circuit for operation with the engine running.
  • the electrically operated refrigerant compressor is provided as an independent structural unit and is located in the refrigerant circuit arranged parallel to the mechanically operated refrigerant compressor.
  • the refrigerant compressor is designed as a so-called hybrid refrigerant compressor, which enables both a mechanical Antieb and an electric Antieb. At standstill of the engine before driving the hybrid refrigerant compressor, for example, electrically and mechanically operated with the engine running.
  • the pre-air conditioning of the air to be introduced into the passenger compartment by means of the already existing in the system as standard electric refrigerant compressor, which is controlled by a traction battery of the vehicle, possible.
  • the electric refrigerant compressor Since the electric refrigerant compressor has a significant power requirement, its speed is made dependent on the state of charge of these batteries due to the limited capacity of the batteries.
  • the time that is set for the pre-air conditioning or pre-cooling can be limited to a maximum operating time.
  • Figure 1 is a schematic circuit diagram of a
  • Air conditioner for a stationary air conditioning according to the invention.
  • FIG. 1 shows an embodiment of an air conditioner for a stationary air conditioning with a refrigerant circuit 1.
  • the air conditioning system is provided for a motor vehicle and has common means for guiding and conditioning in the Passenger compartment to be introduced air, which are not shown for clarity in the drawing.
  • a housing for guiding and distributing the air, heat exchanger, blower for conveying the air and other means such as flaps and sensors are commonly provided.
  • the air conditioning system has at least one refrigerant circuit 1 with a mechanically driven refrigerant compressor 4, which is mechanically connected on its drive side to the drive unit of the vehicle and driven by the same.
  • a condenser / gas cooler 3 and an evaporator 2 with an upstream or integrated expansion unit are provided in the refrigerant circuit 1 along the flow direction of the refrigerant.
  • a further refrigerant compressor 5 is connected to the fluid circuit of the refrigerant circuit 1, which is electrically driven.
  • the structural unit of the refrigerant compressor 5 has an electric motor.
  • the operation of the refrigerant compressor 5 can be carried out in sole dependence on the associated batteries 6.
  • An associated control unit of the batteries 6 controls the operation of the Kält ⁇ dttelverêtrs 5 depending on the state of charge of the battery. 6
  • one of the two refrigerant compressors 4 or 5 must in each case be shut off from other refrigerant compressors 5 or 4 either in a conveying mode adapted to this operation or counter to the conveying direction. This can be done by the refrigerant compressor 5 or 4 itself or an upstream valve unit 7, which is designed as a check valve.
  • the electrically operated refrigerant compressor 5 has a controller that controls the operation of the refrigerant compressor 5 depending on the cabin air temperature of the vehicle.
  • the control unit evaluates the measured value of a temperature sensor which detects the temperature value prevailing in the passenger compartment. Above a switch-on value of this temperature, the refrigerant compressor 5 is turned on.
  • the temperature value can be variable and, for example, be lower with full batteries 6 than with partially discharged batteries 6.
  • the air conditioner has a ventilation device associated with the evaporator 2 and acting on the air stream passing through the evaporator 2 and supplied to the vehicle cabin, which fresh air conveys into the vehicle cabin. Furthermore, a heater is provided, which also acts on the evaporator 2 passing through and the vehicle cabin supplied air flow.
  • the control unit of the refrigerant compressor 5 controls, depending on the prevailing in the vehicle cabin temperature, the operation of the ventilation device, wherein the vehicle cabin unconditioned air is supplied, the operation of the heater, which heats the vehicle when the drive unit of the vehicle supplied air, and the operation of the refrigeration cycle 1 by means of the refrigerant compressor .5, through which the. Vehicle interior supplied air is cooled.
  • the control unit can also be integrated in the auxiliary heater and act indirectly on the refrigerant compressor 5.
  • the operating states can be carried out alternately or, for example, for a reheat operation or in a ventilation device acting on the participating heat exchangers of the auxiliary heating or the refrigerant circuit 1.
  • the auxiliary heater with the ventilation device can be turned on.
  • the ventilation device which is also advantageously supplied by the battery 6, initially operated alone and only at high temperatures takes place a conditioning of the air of the passenger compartment by means of the refrigerant compressor 5 operated refrigerant circuit 1. It can also upstream of a flushing of the cabin on the sole operation of the ventilation system done.
  • the control unit of the refrigerant compressor 5 has a timer, which allows a timed operation of the stall ventilation and / or conditioning.
  • the control unit of the refrigerant compressor 5 further has a remote control, which can activate one of the functions mentioned above for stand ventilation and / or conditioning or this combined via radio. The activation can be done directly or via an assigned time circuit. The activation may also effect the transmission of a switch-on time from the remote control to the controller.
  • the remote control works for example by radio or Infrafot.
  • refrigerant circuit 1 In addition to the structure of the refrigerant circuit 1 shown in the drawing, embodiments are also possible which have only one refrigerant compressor 5, which can be electrically stored. It can be designed as a purely electrically operable refrigerant compressor 5, which is operated even when the drive unit of the vehicle is running via an associated generator and intermediate batteries.
  • the refrigerant compressor 5 can also be designed as Hybridklaltesch- ⁇ compressor optionally is mechanically from the drive unit or operable by an electrical drive unit.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

La présente invention concerne un système de climatisation destiné à un véhicule automobile, comprenant au moins un circuit d'agent de refroidissement auquel est intégré un compresseur d'agent de refroidissement supplémentaire qui peut fonctionner à l'électricité avant démarrage lorsque le moteur est arrêté.
PCT/EP2006/000968 2005-02-03 2006-02-03 Systeme de climatisation pour vehicule automobile WO2006082082A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005004950A DE102005004950A1 (de) 2005-02-03 2005-02-03 Klimaanlage für ein Kraftfahrzeug
DE102005004950.8 2005-02-03

Publications (1)

Publication Number Publication Date
WO2006082082A1 true WO2006082082A1 (fr) 2006-08-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/000968 WO2006082082A1 (fr) 2005-02-03 2006-02-03 Systeme de climatisation pour vehicule automobile

Country Status (2)

Country Link
DE (1) DE102005004950A1 (fr)
WO (1) WO2006082082A1 (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008037246A1 (fr) * 2006-09-27 2008-04-03 Enerday Gmbh Installation de climatisation pour un véhicule automobile
US7591143B2 (en) 2002-04-29 2009-09-22 Bergstrom, Inc. Vehicle air conditioning and heating system providing engine on and engine off operation
US9694651B2 (en) 2002-04-29 2017-07-04 Bergstrom, Inc. Vehicle air conditioning and heating system providing engine on and off operation
US9783024B2 (en) 2015-03-09 2017-10-10 Bergstrom Inc. System and method for remotely managing climate control systems of a fleet of vehicles
US9796239B2 (en) 2013-03-13 2017-10-24 Bergstrom Inc. Air conditioning system utilizing heat recovery ventilation for fresh air supply and climate control
US9840130B2 (en) 2013-03-13 2017-12-12 Bergstrom Inc. Air conditioning system utilizing thermal capacity from expansion of compressed fluid
US9874384B2 (en) 2016-01-13 2018-01-23 Bergstrom, Inc. Refrigeration system with superheating, sub-cooling and refrigerant charge level control
US10006684B2 (en) 2015-12-10 2018-06-26 Bergstrom, Inc. Air conditioning system for use in vehicle
US10081226B2 (en) 2016-08-22 2018-09-25 Bergstrom Inc. Parallel compressors climate system
US10245916B2 (en) 2013-11-04 2019-04-02 Bergstrom, Inc. Low profile air conditioning system
US10369863B2 (en) 2016-09-30 2019-08-06 Bergstrom, Inc. Refrigerant liquid-gas separator with electronics cooling
US10562372B2 (en) 2016-09-02 2020-02-18 Bergstrom, Inc. Systems and methods for starting-up a vehicular air-conditioning system
US10589598B2 (en) 2016-03-09 2020-03-17 Bergstrom, Inc. Integrated condenser and compressor system
US10675948B2 (en) 2016-09-29 2020-06-09 Bergstrom, Inc. Systems and methods for controlling a vehicle HVAC system
US10724772B2 (en) 2016-09-30 2020-07-28 Bergstrom, Inc. Refrigerant liquid-gas separator having an integrated check valve
US11420496B2 (en) 2018-04-02 2022-08-23 Bergstrom, Inc. Integrated vehicular system for conditioning air and heating water
US11448441B2 (en) 2017-07-27 2022-09-20 Bergstrom, Inc. Refrigerant system for cooling electronics

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007012421A1 (de) 2007-03-15 2008-09-18 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Vorklimatisierung eines Kraftfahrzeugs im Stillstand
US20100050671A1 (en) * 2008-08-29 2010-03-04 Paccar Inc Climate control systems and methods for a hybrid vehicle
DE102008051709A1 (de) 2008-10-16 2010-04-22 Daimler Ag Verfahren zum Betreiben einer Klimaanlage
US9216628B2 (en) * 2012-04-24 2015-12-22 Zero Rpm, Inc. Apparatus and methods for vehicle idle management
DE102013202601A1 (de) * 2013-02-19 2014-08-21 Bayerische Motoren Werke Aktiengesellschaft Verfahren und System zur Vorkonditionierung einer Heiz- und/oder Kühleinheit in einem Kraftfahrzeug
DE102013003062B4 (de) 2013-02-22 2014-10-30 Audi Ag Verfahren zum Betrieb eines Kraftfahrzeugs bei einer Vorklimatisierung und Kraftfahrzeug
DE102013215473A1 (de) * 2013-08-06 2015-02-12 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zum Regeln einer Standklimatisierung für ein Fahrzeug
DE102016000318B4 (de) 2016-01-13 2021-01-14 Audi Ag Verfahren zum elektrischen Vorklimatisieren einer Fahrgastzelle eines Fahrzeugs

Citations (8)

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Publication number Priority date Publication date Assignee Title
US3844130A (en) * 1973-07-09 1974-10-29 M Wahnish Automobile air conditioning system employing auxiliary prime motor
WO1997024566A1 (fr) * 1995-12-29 1997-07-10 Schroeder Bradley S Appareil de commande a distance du chauffage et de la climatisation d'un vehicule
DE102004004302A1 (de) * 2003-02-03 2004-08-12 Denso Corp., Kariya Fernbedienbare Fahrzeugklimaanlage
DE10308254A1 (de) 2003-02-25 2004-09-02 Behr Gmbh & Co. Kg Klimaanlage für ein Fahrzeug und zugehöriges Betriebsverfahren
DE102004008133A1 (de) 2003-02-18 2004-10-07 Behr Gmbh & Co. Kg Energieversorgungssystem für ein Kraftfahrzeug
DE10316106A1 (de) * 2003-04-09 2004-10-21 Daimlerchrysler Ag Verfahren und Vorrichtung zur Standklimatisierung
US20040206102A1 (en) * 2003-04-16 2004-10-21 Toshinobu Homan Air conditioner with control of compressor
DE102004041161A1 (de) 2003-08-28 2005-03-24 General Motors Corp., Detroit Klimakühlungssteuersysteme und -verfahren für Hybridfahrzeuge

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844130A (en) * 1973-07-09 1974-10-29 M Wahnish Automobile air conditioning system employing auxiliary prime motor
WO1997024566A1 (fr) * 1995-12-29 1997-07-10 Schroeder Bradley S Appareil de commande a distance du chauffage et de la climatisation d'un vehicule
DE102004004302A1 (de) * 2003-02-03 2004-08-12 Denso Corp., Kariya Fernbedienbare Fahrzeugklimaanlage
DE102004008133A1 (de) 2003-02-18 2004-10-07 Behr Gmbh & Co. Kg Energieversorgungssystem für ein Kraftfahrzeug
DE10308254A1 (de) 2003-02-25 2004-09-02 Behr Gmbh & Co. Kg Klimaanlage für ein Fahrzeug und zugehöriges Betriebsverfahren
DE10316106A1 (de) * 2003-04-09 2004-10-21 Daimlerchrysler Ag Verfahren und Vorrichtung zur Standklimatisierung
US20040206102A1 (en) * 2003-04-16 2004-10-21 Toshinobu Homan Air conditioner with control of compressor
DE102004041161A1 (de) 2003-08-28 2005-03-24 General Motors Corp., Detroit Klimakühlungssteuersysteme und -verfahren für Hybridfahrzeuge

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7591143B2 (en) 2002-04-29 2009-09-22 Bergstrom, Inc. Vehicle air conditioning and heating system providing engine on and engine off operation
US7591303B2 (en) 2002-04-29 2009-09-22 Bergstrom, Inc. Vehicle air conditioning and heating method providing engine on and engine off operation
US8453722B2 (en) 2002-04-29 2013-06-04 Bergstrom, Inc. Vehicle air conditioning and heating system providing engine on and engine off operation
US9487063B2 (en) 2002-04-29 2016-11-08 Bergstrom, Inc. Vehicle air conditioning and heating system providing engine on and engine off operation
US9694651B2 (en) 2002-04-29 2017-07-04 Bergstrom, Inc. Vehicle air conditioning and heating system providing engine on and off operation
WO2008037246A1 (fr) * 2006-09-27 2008-04-03 Enerday Gmbh Installation de climatisation pour un véhicule automobile
US10414243B2 (en) 2013-03-13 2019-09-17 Bergstrom, Inc. Vehicular ventilation module for use with a vehicular HVAC system
US9840130B2 (en) 2013-03-13 2017-12-12 Bergstrom Inc. Air conditioning system utilizing thermal capacity from expansion of compressed fluid
US9796239B2 (en) 2013-03-13 2017-10-24 Bergstrom Inc. Air conditioning system utilizing heat recovery ventilation for fresh air supply and climate control
US10245916B2 (en) 2013-11-04 2019-04-02 Bergstrom, Inc. Low profile air conditioning system
US10967709B2 (en) 2015-03-09 2021-04-06 Bergstrom, Inc. Graphical user interfaces for remotely managing climate control systems of a fleet of vehicles
US9783024B2 (en) 2015-03-09 2017-10-10 Bergstrom Inc. System and method for remotely managing climate control systems of a fleet of vehicles
US10427496B2 (en) 2015-03-09 2019-10-01 Bergstrom, Inc. System and method for remotely managing climate control systems of a fleet of vehicles
US11780292B2 (en) 2015-03-09 2023-10-10 Bergstrom, Inc. Graphical user interfaces for remotely managing climate control systems of a fleet of vehicles
US10006684B2 (en) 2015-12-10 2018-06-26 Bergstrom, Inc. Air conditioning system for use in vehicle
US9874384B2 (en) 2016-01-13 2018-01-23 Bergstrom, Inc. Refrigeration system with superheating, sub-cooling and refrigerant charge level control
US10527332B2 (en) 2016-01-13 2020-01-07 Bergstrom, Inc. Refrigeration system with superheating, sub-cooling and refrigerant charge level control
US10589598B2 (en) 2016-03-09 2020-03-17 Bergstrom, Inc. Integrated condenser and compressor system
US10081226B2 (en) 2016-08-22 2018-09-25 Bergstrom Inc. Parallel compressors climate system
US10703173B2 (en) 2016-08-22 2020-07-07 Bergstrom, Inc. Multi-compressor climate system
US11479086B2 (en) 2016-08-22 2022-10-25 Bergstrom, Inc. Multi-compressor climate system
US10562372B2 (en) 2016-09-02 2020-02-18 Bergstrom, Inc. Systems and methods for starting-up a vehicular air-conditioning system
US10675948B2 (en) 2016-09-29 2020-06-09 Bergstrom, Inc. Systems and methods for controlling a vehicle HVAC system
US11241939B2 (en) 2016-09-29 2022-02-08 Bergstrom, Inc. Systems and methods for controlling a vehicle HVAC system
US11712946B2 (en) 2016-09-29 2023-08-01 Bergstrom, Inc. Systems and methods for controlling a vehicle HVAC system
US10369863B2 (en) 2016-09-30 2019-08-06 Bergstrom, Inc. Refrigerant liquid-gas separator with electronics cooling
US11512883B2 (en) 2016-09-30 2022-11-29 Bergstrom, Inc. Refrigerant liquid-gas separator
US10724772B2 (en) 2016-09-30 2020-07-28 Bergstrom, Inc. Refrigerant liquid-gas separator having an integrated check valve
US11448441B2 (en) 2017-07-27 2022-09-20 Bergstrom, Inc. Refrigerant system for cooling electronics
US11420496B2 (en) 2018-04-02 2022-08-23 Bergstrom, Inc. Integrated vehicular system for conditioning air and heating water
US11919364B2 (en) 2018-04-02 2024-03-05 Bergstrom, Inc. Integrated vehicular system for conditioning air and heating water

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