| 摘要 |
<p>A control unit (1a) of a heat pump system (1) during air-warming operation controls usage-side expansion valves (82a, 82b) so that a degree of subcooling (SCu) of an outlet refrigerant is equal to a target degree of subcooling (SCus) of the outlet refrigerant, and controls a heat-source-side expansion valve (28) so that a degree of superheat (SHh) of the outlet refrigerant is equal to a target degree of superheat (SHhs) of the outlet refrigerant. Furthermore, the control unit (1a) performs refrigerant recovery control for changing the target degree of superheat (SHhs) of the outlet refrigerant so that the refrigerant in the outlet of the heat-source-side heat exchanger is wet when the usage-side expansion valves (82a, 82b) are opened to be greater than an opening degree (OPcs) for the start of refrigerant recovery, and cancelling the change in the target degree of superheat (SHhs) of the outlet refrigerant when the usage-side expansion valves (82a, 82b) are closed to be smaller than an opening degree (OPce) for the end of refrigerant recovery.</p> |
