Patent ID: 9010280
Filing Date: 2015-04-21
Classification: F24D,F24H,Y02B

Abstract:
1. A hot-water supply system comprising: a hot-water tank, a hot-water supply pipe connected to the hot-water tank, a water supply pipe connected to the hot-water tank and the hot-water supply pipe, a heating unit configured to heat the water in the hot-water tank, a water current sensor configured to detect a water current to the water supply pipe, a hot-water flow regulation valve disposed between a joint location of the hot-water supply pipe to the hot-water tank and a joint location of the hot-water supply pipe to the water supply pipe for regulating an opening degree of the hot-water supply pipe, a water flow regulation valve disposed between a joint location of the water supply pipe to the hot-water tank and the joint location of the hot-water supply pipe to the water supply pipe for regulating an opening degree of the water supply pipe, a hot-water storage temperature sensor configured to detect a temperature of the water in the hot-water tank, a hot-water supply apparatus disposed in the midway of the hot-water supply pipe at a downstream side of the joint location between the hot-water supply pipe and the water supply pipe for heating the water flowing through the hot-water supply pipe, a hot-water supply temperature setting unit configured to set a desired hot-water supply temperature, and a temperature regulation control unit configured to perform a temperature regulation control via mixing by prohibiting the heating by the hot-water supply apparatus and regulating a mixing ratio of the hot-water supplied from the hot-water tank to the hot-water supply pipe and the water supplied from the water supply pipe to the hot-water supply pipe by controlling the hot-water flow regulation valve and the water flow regulation valve so as to supply the hot-water having the desired hot-water supply temperature from the hot-water supply pipe when the water current is detected by the water current sensor and the detection temperature by the hot-water storage temperature sensor is higher than a hot-water shortage determination temperature set according to the desired hot-water supply temperature, and to perform a temperature regulation control via heating by permitting the heating by the hot-water supply apparatus so as to supply the hot-water having the desired hot-water supply temperature from the hot-water supply pipe when the water current is detected by the water current sensor and the detection temperature by the hot-water storage temperature sensor is equal to or lower than the hot-water shortage determination temperature, wherein the hot-water supply system further comprises a mixing temperature sensor disposed at a downstream side close to the joint location between the hot-water supply pipe and the water supply pipe for detecting a temperature of the water supplied from the joint location between the hot-water supply pipe and the water supply pipe to the hot-water supply pipe, and when the temperature regulation control via heating is initiated, the temperature regulation control unit regulates the mixing ratio by controlling the hot-water flow regulation valve and the water flow regulation valve so as to lower a detection temperature of the mixing temperature sensor from a temperature obtained by subtracting a minimum capacity temperature from the desired hot-water supply temperature by a first predefined temperature over a predefined time, and thereafter opens the hot-water flow regulation valve and the water flow regulation valve to a maximum opening degree, wherein the minimum capacity temperature is a temperature increment of the hot-water in a present flow state when heated by the hot-water supply apparatus with a minimum heating capacity.