| 摘要 |
<P>PROBLEM TO BE SOLVED: To calculate the flowrate of a heating medium without using any flowmeter. <P>SOLUTION: A request refrigerant cyclic flowrate calculating unit 74 installed in a cold water flowrate estimating unit 70 is configured to calculate an evaporator heat exchange duty to be exchanged between a refrigerant and cold water in an evaporator on the basis of a cold water flowmeter image value and the measured value of the temperature of cold water running through the evaporator, and to calculate an evaporator refrigerant flowrate on the basis of the evaporator heat exchange duty. Then, a cold water cyclic flowrate calculation-back unit 78 is configured to calculate back the evaporator refrigerant flowrate on the basis of the rate of the set value of a differential pressure between a condenser and the evaporator to the measured value of the differential pressure and the calculated evaporator refrigerant flowrate, and to calculate back the evaporator heat exchange duty to be exchanged between the refrigerant and the cold water in the evaporator from the calculated-back evaporator refrigerant flowrate, and to calculate back the flowrate of the cold water on the basis of the calculated-back evaporator heat exchange duty and the measured value of the temperature of the cold water running through the evaporator. <P>COPYRIGHT: (C)2013,JPO&INPIT |
