| 摘要 |
A flow rate of a heat transfer medium is computed without a flow meter. In a control apparatus (30), a storing portion (36) stores an aerodynamic characteristic map indicating a line causing a rotating stall and lines showing a sonic velocity in a refrigerant sucked in by a compressor (12) on a map displaying a variable ¸ reflecting a suction volume of the compressor (12) and a variable Q reflecting a head of the compressor (12); a estimation portion of chilled water flow rate (30b) computes the variable Q, derives the variable ¸ according to the variable Q from the map, computes a heat amount exchanged between the refrigerant and the chilled water in an evaporator (24) based on the suction volume of the compressor (12) according to the computed variable ¸, and computes the flow rate of the chilled water based on the heat amount. |
