| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-stage turbo refrigerator allowing stable operation even when a cooling water inlet temperature is low and an evaporation pressure is lowered. SOLUTION: In this multi-stage turbo refrigerator, a capacity is controlled by a compressor 1, an evaporator 2, a condenser 3, an intercooler 4, and the inlet guide vane 5 of the compressor 1. The turbo refrigerator comprises a control device controlling the inlet guide vane 5 to a maximum opening by a temperature detector 16 installed on the cooling water inlet side of the condenser 3 and controlling the openings of a motor driven valve 9 installed between a compressor intermediate stage suction and the intercooler 4, a motor driven valve 10 installed in a pipe bypassing an expansion orifice 13 between the condenser 3 and the intercooler 4, the evaporator, and a motor driven valve 11 installed in a condenser bypass. COPYRIGHT: (C)2004,JPO&NCIPI
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