| 摘要 |
PROBLEM TO BE SOLVED: To shorten a defrost time by simultaneously melting frost of upper and lower heat source-side heat exchangers in a defrosting operation, in a refrigeration device in which the vertically-divided heat source-side heat exchangers are disposed in a top-blown-type heat source unit.SOLUTION: A first heat source-side flow rate adjustment valve capable of adjusting an opening, is connected to a liquid-side of a first heat source-side heat exchanger on an upper side, and a second heat source-side flow rate adjustment valve capable of adjusting an opening, is connected to a liquid-side of a second heat source-side heat exchanger on a lower side. Here, in a defrosting operation for defrosting the first and second heat source-side heat exchangers, the openings of the first and second heat source-side flow rate adjustment valves are controlled to keep a defrost flow rate as a flow rate to allow much refrigerant to flow in the second heat source-side heat exchanger in comparison with that in a cooling operation. |
