| 摘要 |
PROBLEM TO BE SOLVED: To distribute equally the quantity of a refrigerant circulating from a heat exchanger of a using side to respective compressors of a plurality of heat sources. SOLUTION: A heat source of large capacity is formed by combining a primary heat source 1 and a secondary heat source 101. Imbalance of the quantity of a liquid refrigerant which returns to the primary heat source 1 and the secondary heat source 101 is detected according to a superheating ratio, that is a drying ratio, of a refrigerant at an inlet of a primary liquid storage unit 8 calculated by a primary heat exchanger superheating ratio arithmetic means and a superheating ratio of a refrigerant at an inlet of a secondary liquid storage unit 108 of the secondary heat source 101 calculated by a secondary heat exchanger superheating ratio arithmetic means. An equal liquid control is executed by an equal liquid control means 19 to correct the imbalance of the quantity of liquid in the primary liquid storage unit 8 and the secondary liquid storage unit 108, allowing to prevent in advance a superheated operation due to an excessive liquid returning to one side of the primary heat source 1 and the secondary heat source 101, and improve the reliability of the operation of a compressor. |
