| 摘要 |
PROBLEM TO BE SOLVED: To enable exhibition of sufficient heating capacity even in a cold district where the outside air temperature is -10°C or lower by improving the heating capacity in a refrigerating air conditioner more than that in a conventional gas injection cycle. SOLUTION: The refrigerating air conditioner includes a compressor 3, an indoor heat exchanger 6, a first decompression device 11, and an outdoor heat exchanger 12, which are circularly connected to supply hot heat from the indoor heat exchanger. This air conditioner further comprises a first internal heat exchanger 9 heat-exchanging the refrigerant between the indoor heat exchanger and the first decompression device with the refrigerant between the outdoor heat exchanger and the compressor; an injection circuit 13 injecting the refrigerant between the indoor heat exchanger and the first decompression device into a compression chamber within the compressor while partially bypassing; an injection decompression device 14 provided in the injection circuit; and a second internal heat exchanger 10 heat-exchanging the refrigerant decompressed by the injection decompression device with the refrigerant between the indoor heat exchanger and the first decompression device. COPYRIGHT: (C)2006,JPO&NCIPI
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