| CPC B60H 1/32281 (2019.05) [B60H 1/3205 (2013.01)] | 8 Claims |
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1. A vehicle air conditioning system comprising:
a refrigerant circuit configured to circulate a refrigerant through a compressor, a heat-absorbing heat exchanger, an expansion valve, and a heat-dissipating heat exchanger in accordance with a refrigeration cycle;
a heat medium circuit including a high-temperature heat medium circuit configured to circulate a high-temperature heat medium that absorbs heat from the refrigerant in the heat-absorbing heat exchanger and a low-temperature heat medium circuit configured to circulate a low-temperature heat medium that dissipates heat to the refrigerant in the heat-dissipating heat exchanger;
a vehicle interior heat exchanger configured to exchange heat between air and at least one of the high-temperature heat medium and the low-temperature heat medium;
a vehicle exterior heat exchanger configured to exchange heat between air and at least one of the high-temperature heat medium and the low-temperature heat medium; and
switching valves configured to switch respective flows of the high-temperature heat medium and the low-temperature heat medium in accordance with an operation mode of the vehicle air conditioning system, wherein
the heat medium circuit supplies the high-temperature heat medium to at least one of the vehicle interior heat exchanger and the vehicle exterior heat exchanger and supplies the low-temperature heat medium to at least one of the vehicle interior heat exchanger and the vehicle exterior heat exchanger, in accordance with the operation mode,
at least one of the vehicle interior heat exchanger and the vehicle exterior heat exchanger includes a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger being connectable in series or in parallel in the heat medium circuit,
the switching valves switch a flow of the high-temperature heat medium on an upstream side and a downstream side of the heat-absorbing heat exchanger, switches a flow of the low-temperature heat medium on an upstream side and a downstream side of the heat-dissipating heat exchanger, and switches a connection of the first heat exchanger and the second heat exchanger between series connection and parallel connection,
the vehicle exterior heat exchanger includes:
a first exterior heat exchanger as the first heat exchanger; and
a second exterior heat exchanger as the second heat exchanger,
the operation mode includes at least one of:
a heating mode in which the low-temperature heat medium is sequentially supplied to the first exterior heat exchanger and the second exterior heat exchanger in a state where the first exterior heat exchanger and the second exterior heat exchanger are connected in series, and the high-temperature heat medium is supplied to the vehicle interior heat exchanger, and
a cooling mode in which the high-temperature heat medium is sequentially supplied to the first exterior heat exchanger and the second exterior heat exchanger in a state where the first exterior heat exchanger and the second exterior heat exchanger are connected in series, and the low-temperature heat medium is supplied to the vehicle interior heat exchanger, and
the operation mode includes:
a continuous heating mode of sequentially performing, in a state where the first exterior heat exchanger and the second exterior heat exchanger are connected in parallel,
a first heating step of supplying the low-temperature heat medium to the first exterior heat exchanger, supplying the high-temperature heat medium to the second exterior heat exchanger, and supplying the high-temperature heat medium to the vehicle interior heat exchanger, and
a second heating step of supplying the low-temperature heat medium to the second exterior heat exchanger, supplying the high-temperature heat medium to the first exterior heat exchanger, and supplying the high-temperature heat medium to the vehicle interior heat exchanger.
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