| 摘要 |
PROBLEM TO BE SOLVED: To provide an air conditioner which is cheap and has a plurality of refrigeration cycles capable of performing efficient operation.SOLUTION: The air conditioner includes: an upstream side refrigeration device R1 in which a compressor 1a, a four-way valve 2a, an exhaust heat side heat exchanger 3a, an expansion device 4a and a utilization side heat exchanger 5a are connected by a refrigerant pipeline h4; and a downstream side refrigeration device R2 in which a compressor 1b, a four-way valve 2b, an exhaust heat side heat exchanger 3b, an expansion device 4b and a utilization side heat exchanger 5b are connected by a refrigerant pipeline h5. A flow passage h1 of a heat load medium of the utilization side heat exchangers 5a, 5b is connected to the upstream side refrigeration device R1 and the downstream side refrigeration device R2 in series in this order. The exhaust heat side heat exchanger 3a of the upstream side refrigeration device R1 and the exhaust heat side heat exchanger 3b of the downstream side refrigeration device R2 have the same or almost the same heat exchange capacity. The operation capacity of the compressor 1b on the downstream side is larger than the operation capacity of the compressor 1a on the upstream side.SELECTED DRAWING: Figure 1 |
