| 摘要 |
<P>PROBLEM TO BE SOLVED: To calculate the flowrate of a heating medium without using a flowmeter. <P>SOLUTION: A control device 30 includes: a storage part 36 for storing an aerodynamic characteristic map in which a rotating stall line indicating the occurrence of the rotating stall and a plurality of machine Mach number lines indicating the speed of sound of a refrigerant to be sucked by the compressor 12 are shown on a map displayed with a flowrate variable θ on which the suction air flow of the compressor 12 is reflected and a pressure variable Ω on which the head of the compressor 12 is reflected, calculates the pressure variable Ω by a cold water flowrate estimation part 30b, calculates the flowrate variable θ corresponding to the pressure variable Ω from the aerodynamic characteristic map, and calculates heat quantity to be exchanged between the refrigerant and the cold water in an evaporator 24 on the basis of the suction air flow of the compressor 12 corresponding to the flowrate variable θ, which has been calculated, and calculates the flowrate of the cold water on the basis of the heat quantity. <P>COPYRIGHT: (C)2013,JPO&INPIT |
