The invention relates to an air conditioner for a motor vehicle, comprising a coolant circuit (1) that is provided with several heat-transferring devices through which a coolant can be directed, a heat-transferring device (12) also being part of a coolant circuit. Coolant is redirected from portion
The invention relates to an air conditioner for a motor vehicle, comprising a coolant circuit (1) that is provided with several heat-transferring devices through which a coolant can be directed, a heat-transferring device (12) also being part of a coolant circuit. Coolant is redirected from portions of the coolant circuit (1), which are shut down during heating, into a portion of the coolant circuit (1), which is active during heating, as required. Also disclosed is a method for operating such an air conditioner.
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The invention claimed is: 1. An air-conditioning system for a motor vehicle, comprising: a refrigerant circuit with a plurality of heat exchangers through which a refrigerant can be passed, wherein one of the heat exchangers is simultaneously part of a coolant circuit, wherein the refrigerant circu
The invention claimed is: 1. An air-conditioning system for a motor vehicle, comprising: a refrigerant circuit with a plurality of heat exchangers through which a refrigerant can be passed, wherein one of the heat exchangers is simultaneously part of a coolant circuit, wherein the refrigerant circuit is capable of a heating mode, wherein the refrigerant circuit comprises a first set of parts which are inoperative in the heating mode and a second set of parts which are active in the heating mode, wherein the refrigerant circuit is configured such that refrigerant recirculation from the first set of parts into the second set of parts is provided on demand in a refrigerant recirculation mode, and wherein the refrigerant circuit is configured to disconnect the one of the heat exchangers from inflow of coolant flowing in the coolant circuit for the refrigerant recirculation mode. 2. The air-conditioning system as claimed in claim 1, the first set of parts comprises the one of the heat exchangers and another additional heat exchanger. 3. The air-conditioning system as claimed in claim 1, wherein the coolant circuit is an engine coolant circuit. 4. The air-conditioning system as claimed in claim 1, further comprising a means for determining a demand for refrigerant. 5. The air-conditioning system as claimed in claim 4, wherein the means for determining a demand for refrigerant comprises one or more temperature sensors and/or pressure sensors. 6. The air-conditioning system as claimed in claim 4, wherein the means for determining a demand for refrigerant comprises a temperature sensor in the refrigerant circuit provided downstream of a compressor and upstream of a heater, as seen in a direction of flow of the refrigerant. 7. The air-conditioning system as claimed in claim 4, wherein the means for determining a demand for refrigerant comprises a pressure sensor in the refrigerant circuit arranged upstream of a compressor, as seen in a direction of flow of the refrigerant. 8. The air-conditioning system as claimed in claim 1, wherein the refrigerant circuit has parts through which refrigerant flows in the heating mode, and wherein the air-conditioning system further comprises a means for determining whether there is sufficient refrigerant in the parts of the refrigerant circuit through which refrigerant flows in the heating mode. 9. The air-conditioning system as claimed in claim 1, wherein a nonreturn valve is provided in the refrigerant circuit, wherein the nonreturn valve, in the heating mode, is configured to separate the second set parts of the refrigerant circuit from the first set of parts of the refrigerant circuit, and wherein the nonreturn valve, in the refrigerant recirculation mode, allows refrigerant to pass from the first set of parts of the refrigerant circuit to the second set of parts of the refrigerant circuit. 10. A method for operating the air-conditioning system, wherein the air-conditioning system comprises a refrigerant circuit with a plurality of heat exchangers through which a refrigerant can be passed, wherein one of the heat exchangers is simultaneously part of a coolant circuit, wherein the refrigerant circuit is capable of a heating mode, wherein the refrigerant circuit comprises a first set of parts which are inoperative in the heating mode and a second set of parts which are active in the heating mode, wherein the refrigerant circuit is configured such that refrigerant recirculation from the first set of parts into the second set of parts is provided on demand, wherein the method comprises: determining, at least in the heating mode, a demand for refrigerant in the second set of parts; and withdrawing refrigerant from the first set of parts to fed the second set of parts by disconnecting the one of the heat exchangers from inflow of coolant flowing in the coolant circuit. 11. The method as claimed in claim 10 wherein at least one parameter is monitored to determine the demand for refrigerant, wherein the at least one parameter is a hot-gas temperature, a suction pressure, a temperature of the refrigerant, a high pressure, a compressor rotational speed, or any combination thereof. 12. The method as claimed in claim 11, wherein a plurality of parameters are monitored for determining the demand for refrigerant, wherein threshold values for the monitored parameters are determined, and wherein the method further comprises detecting the monitored parameters that exceed or fall below the determined threshold values. 13. The method as claimed in claim 12, wherein the threshold values are derived from characteristic diagrams determined from the parameters to be monitored. 14. The method as claimed in claim 10, further comprising terminating the refrigerant recirculation after a predetermined time; after a heating power has dropped below a predetermined, minimum heating power; after a hot-gas temperature has dropped below a hot-gas temperature threshold value; or after a suction pressure has dropped below a suction pressure threshold value. 15. The method as claimed in claim 10, wherein an expansion valve in the first set of parts is closed and air routing in the air-conditioning system is switched to recirculated air during refrigerant recirculation. 16. The method as claimed in claim 15, wherein the expansion valve is opened again after suction pressure has dropped below a predetermined suction pressure level. 17. The method as claimed in claim 10, wherein a fan is switched on in order to apply air to a gas cooler. 18. The method as claimed in claim 10 wherein, when the one of the heat exchangers is operated in the heating mode, the one of the heat exchangers is disconnected from the coolant circuit when suction pressure exceeds an upper limit value. 19. The method as claimed in claim 18, wherein the one of the heat exchangers is connected back into the coolant circuit after the suction pressure has dropped below a second limit value. 20. The method as claimed in claim 10, wherein a constant suction pressure is set by a flow of coolant in an evaporator.
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이 특허에 인용된 특허 (6)
Alsenz Richard H. (1545 Industrial Dr. Missouri City TX 77489), Condensed liquid pump for compressor body cooling.
Numazawa Shigeo (Nagoya JPX) Suzuki Takahisa (Osaka JPX), System for controlling the temperature of the air in a cabin for an engine-electric motor hybrid car.
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