| 摘要 |
PURPOSE:To minimize the temperature change of hot water supplied even if the supply rate of hot water is varied, calculating the required quantity of heat from the temperature and the flow rate of feed water and a setting temperature, and controlling the thermal output of a burner according to a signal obtained by correcting the required quantity of heat by the temperature of supplied hot water. CONSTITUTION:The apparatus of this invention comprises a flow sensor FS and an inlet temperature sensor TH1 for detecting respectively the flow rate and the temperature of water supplied to a heat exchanger, an outlet temperature sensor TH2 for detecting the temperature of hot wate discharged from the heat exchanger, and a circuit (g) for setting the temperature of supplied hot water. In a control circuit, there is produced a valve controlling signal for actuating a valve which controls the flow rate of fuel gas supplied to a burner for heating the heat exchanger. Further, in a feedforward circuit, the above valve controlling signal is corrected according to the temperature and the flow rate of water detected respectively by the sensors TH1 and TH2. In a correcting circuit (i), on the other hand, the quantity of correction in the circuit (e) is corrected according to the deviation between the temperature of hot water detected by the sensor TH2 and the setting temperature of the circuit (g). |
