Refrigerant circuit for a vehicle air-conditioning system and method of air-conditioning a vehicle interior

Abstract

The invention relates to a refrigerant circuit (10) of a vehicle air-conditioning system (12), in particular for electric vehicles, comprising a compressor unit (14) which includes a first compressor (16) and a second compressor (18) arranged downstream for compressing a refrigerant (20), a condenser (22) for heating air (24) which can be supplied to a vehicle interior, a first pressure reducing unit (26) arranged downstream of the condenser (22) for decompressing the refrigerant (20) from the condenser (22), a heat exchanger (28) through which refrigerant flows for heat exchange with vehicle ambient air (30), an evaporator (32) for cooling air (24) which can be supplied to a vehicle interior, and a second pressure reducing unit (34) arranged upstream of the evaporator (32) for decompressing the refrigerant (20) from the heat exchanger (28), the second compressor (18), the condenser (22) and the first pressure reducing unit (26) being bypassed in a cooling mode of the vehicle air-conditioning system (12), and the evaporator (32) and the second pressure reducing unit (34) being bypassed in a heating mode of the vehicle air- conditioning system (12).The invention furthermore relates to a method of air-conditioning a vehicle interior, in particular by means of the refrigerant circuit (10) described above.

Description

technical field [0001] The invention relates to a refrigerant circuit of a vehicle air-conditioning system, in particular for an electric vehicle, and to a method for air-conditioning a vehicle interior, in particular by means of such a refrigerant circuit. Background technique [0002] Modern motor vehicles are nowadays often equipped with an air conditioning system for air conditioning the vehicle interior. These vehicle air-conditioning systems are mainly based on the Carnot principle and operate through a refrigerant circuit to achieve cooling of the vehicle interior when there is a high external temperature. To heat the vehicle interior when the outside temperature is low, waste heat from the internal combustion engine of the motor vehicle is usually used. [0003] However, during the warm-up phase in the case of electric vehicles as a whole, and in the case of motor vehicles with internal combustion engines, the waste heat from the vehicle's engine is so small that su...

AI Technical Summary

Problems solved by technology

[0003] However, during the warm-up phase in the case of electric vehicles as a whole, and in the case of motor vehicles with internal combustion engines, the waste heat from the vehicle's engine is so small that it is impossible to satisfy the heating of the vehicle interior

For this, an additional electric heating device is often used, but this is associated with a very high energy consumption and also with an additional requirement for installation space and with additional equipment costs

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