| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that in a refrigerant circuit system corresponding to high temperature water outflow in a low temperature outside air, as the intake gas refrigerant temperature becomes high during defrosting, the discharge gas refrigerant temperature and the motor temperature rise, and stress acts upon a compressor. <P>SOLUTION: The refrigerant circuit system includes: a refrigerant circuit configured by connecting the compressor, a four-way valve, a user side heat exchanger, a valve opening variable main expansion valve, and a heat source side heat exchanger in order; a fluid circuit in which another working fluid is distributed that exchanges heat with a refrigerant in the user side heat exchanger; a first refrigerant injection circuit branched from the refrigerant circuit between the user side heat exchanger and the main expansion valve and connected to a refrigerant compression chamber of the compressor; and a valve opening variable first refrigerant flow rate regulating valve disposed in the first injection circuit. The refrigerant circuit system further includes a second refrigerant injection circuit branched from the refrigerant circuit between the main expansion valve and the heat source side heat exchanger and connected to the refrigerant compression chamber of the compressor, and a valve opening variable second refrigerant flow rate regulating valve disposed in the second injection circuit. <P>COPYRIGHT: (C)2012,JPO&INPIT |
