Hot water supply and heating system

Abstract

A hot water supply and heating system 1 a includes a heating flow rate changing valve 44 that changes the flow rate of hot water flowing through a heating pipe 46 and a priority controller 53 a that carries out hot water supply priority control whereby to reduce the flow rate of the hot water flowing through the heating pipe 46 by the heating flow rate changing valve 44 in the case where the total of the amount of heat consumed in a heating operation and the amount of heat consumed in a hot water supply operation is equal to or more than a maximum amount of heat that can be applied by the heat source machine 10 during a simultaneous operation of the heating operation and the hot water supply operation.

What is claimed is: 
     
         1 . A hot water supply and heating system comprising:
 a heat source machine which is connected to a water supply pipe and a hot water supply pipe to heat water flowing from the water supply pipe to the hot water supply pipe;   a heating pipe which is branched off from the hot water supply pipe and which is in communication with the water supply pipe;   a heater which is connected on a way of the heating pipe and which has a pump, which circulates water in the heating pipe via the heat source machine, and a radiator;   a hot water supply bypass pipe which provides communication between a portion of the water supply pipe on an upstream side relative to a place where the water supply pipe is connected with the heating pipe and a portion of the hot water supply pipe on a downstream side relative to a place where the hot water supply pipe is connected with the heating pipe;   a heating controller which is configured to actuate the pump in a state, wherein the heat source machine is in operation, thereby to carry out a heating operation in which heat is radiated from the radiator;   a hot water supply controller which is configured to carry out a hot water supply operation by carrying out mixing temperature control whereby to adjust a mixing ratio of the hot water from the hot water supply pipe and the water from the hot water supply bypass pipe at a place where the hot water supply pipe and the hot water supply bypass pipe are connected such that hot water of a first desired hot water temperature is supplied to a hot water outlet tap connected to a downstream end of the hot water supply pipe in the state wherein the heat source machine is in operation;   a heating flow rate changer which is configured to change the flow rate of hot water circulating in the heating pipe; and   a priority controller which is configured to carry out hot water supply priority control whereby to reduce the flow rate of the hot water flowing through the heating pipe by the heating flow rate changer in a case where a total of an amount of heat consumed in the heating operation and an amount of heat consumed in the hot water supply operation is equal to or more than a maximum amount of heat that can be applied by the heat source machine during a simultaneous operation of the heating operation and the hot water supply operation.   
     
     
         2 . The hot water supply and heating system according to  claim 1 , comprising:
 a preferential operation setter which is configured to set priority to either the heating operation or the hot water supply operation during the simultaneous operation of the heating operation and the hot water supply operation,   wherein, in the case where the total of the amount of heat consumed in the heating operation and the amount of heat consumed in the hot water supply operation is equal to or more than the maximum amount of heat, the priority controller is configured to carry out the hot water supply priority control in the case where the priority has been set to the hot water supply operation by the preferential operation setter, and to carry out a heating priority control to reduce the first desired hot water temperature in the case where the priority has been set to the heating operation by the preferential operation setter.   
     
     
         3 . The hot water supply and heating system according to  claim 2 ,
 wherein in a case where the heating priority control whereby the first desired hot water temperature has been decreased is carried out, the priority controller notifies that it is in a state in which the first desired hot water temperature has been decreased.   
     
     
         4 . The hot water supply and heating system according to  claim 1 , comprising:
 a preferential operation setter which sets priority to either the heating operation or the hot water supply operation during the simultaneous operation of the heating operation and the hot water supply operation; and   a supplied water flow rate changer which is configured to change the flow rate of water supplied to the water supply pipe,   wherein, in the case where the total of the amount of heat consumed in the heating operation and the amount of heat consumed in the hot water supply operation is equal to or more than the maximum amount of heat, the priority controller carries out the hot water supply priority control in a case where a priority has been set to the hot water supply operation by the preferential operation setter and carries out a heating priority control to reduce, by the supplied water flow rate changer, the flow rate of water to be supplied to the water supply pipe in a case where the priority has been set to the heating operation by the preferential operation setter.   
     
     
         5 . The hot water supply and heating system according to  claim 1 , comprising:
 a output hot water temperature sensor which detects a temperature of hot water output to the hot water supply pipe from the heat source machine,   wherein the hot water supply controller carries out the mixing temperature control based on a temperature detected by the output hot water temperature sensor.