DEVICE FOR ESTIMATING FLOWRATE OF HEATING MEDIUM, HEAT SOURCE DEVICE, AND METHOD FOR ESTIMATING FLOWRATE OF HEATING MEDIUM

摘要

The flow rate of a heat transfer medium is calculated without using a flow rate meter. A required-circulated-refrigerant flow-rate calculating portion (74) provided in a chilled-water flow-rate estimation calculation portion (70) calculates an evaporator exchanged heat quantity exchanged between a refrigerant and chilled water at an evaporator based on a planned chilled-water-flow-rate value and a measured value of the temperature of the chilled water flowing in the evaporator, and calculates an evaporator-refrigerant flow rate based on that evaporator exchanged heat quantity. Then, a circulated-chilled-water flow-rate back-calculating portion (78) back-calculates an evaporator-refrigerant flow rate based on the calculated evaporator-refrigerant flow rate and a ratio between a set value of differential pressure between a condenser and the evaporator and a measured value of that differential pressure, back-calculates an evaporator exchanged heat quantity exchanged between the refrigerant and the chilled water at the evaporator from the back-calculated evaporator-refrigerant flow rate, and back-calculates the flow rate of the chilled water based on the back-calculated evaporator exchanged heat quantity and the measured value of the temperature of the chilled water flowing in the evaporator.