Storage type hot water supplying apparatus

Abstract

A storage type hot water supplying apparatus includes: a condenser having a refrigerant passage located at a hot water storage tank, the condenser being configured to condense refrigerant by exchanging heat between the refrigerant compressed by a compressor and water in the hot water storage tank; control circuitry configured to control a hot water storage operation, and a hot water supply detection sensor capable of detecting that a hot water supply operation is started, the hot water supply operation being an operation in which hot water in the hot water storage tank flows out of the hot water outlet and water flows into the hot water storage tank from the feed water inlet. The control circuitry is configured to increase an opening degree of the expansion valve when the hot water supply operation is started during the hot water storage operation.

1 . A storage type hot water supplying apparatus, comprising:
 a hot water storage tank;   a feed water inlet located at a lower part of the hot water storage tank;   a hot water outlet located at a higher part of the hot water storage tank;   an evaporator for evaporating refrigerant;   a compressor for compressing the refrigerant flowing out of the evaporator;   a condenser having a refrigerant passage located at the hot water storage tank, the condenser being configured to condense the refrigerant by exchanging heat between the refrigerant compressed by the compressor and water in the hot water storage tank;   an expansion valve for expanding the refrigerant flowing out of the condenser;   control circuitry configured to control a hot water storage operation, the hot water storage operation being an operation to heat the water in the hot water storage tank with the refrigerant flowing through the refrigerant passage of the condenser; and   a hot water supply detection sensor capable of detecting that a hot water supply operation is started, the hot water supply operation being an operation in which hot water in the hot water storage tank flows out of the hot water outlet and water flows into the hot water storage tank from the feed water inlet;   wherein the control circuitry is configured to increase an opening degree of the expansion valve when the hot water supply operation is started during the hot water storage operation.   
     
     
         2 . The storage type hot water supplying apparatus according to  claim 1 , wherein a condenser outlet temperature sensor is provided as the hot water supply detection sensor, the condenser outlet temperature sensor being configured to detect a temperature of the refrigerant flowing out of the condenser, and
 the control circuitry is configured to increase the opening degree of the expansion valve when the condenser outlet temperature sensor detects, during the hot water storage operation, that the hot water supply operation is started.   
     
     
         3 . The storage type hot water supplying apparatus according to  claim 1 , wherein a feed water temperature sensor is provided as the hot water supply detection sensor, the feed water temperature sensor being configured to detect a temperature of feed water flowing into the hot water storage tank from the feed water inlet, and
 the control circuitry is configured to increase the opening degree of the expansion valve when the feed water temperature sensor detects, during the hot water storage operation, that the hot water supply operation is started.   
     
     
         4 . The storage type hot water supplying apparatus according to  claim 3 , wherein in a case in which the hot water supply operation is started during the hot water storage operation, the control circuitry is configured to increase the opening degree of the expansion valve as the temperature of the feed water flowing into the hot water storage tank decreases. 
     
     
         5 . The storage type hot water supplying apparatus according to  claim 1 , wherein a hot water supply temperature sensor is provided as the hot water supply detection sensor, the hot water supply temperature sensor being configured to detect a temperature of hot water flowing out of the hot water outlet, and
 the control circuitry is configured to increase the opening degree of the expansion valve when the hot water supply temperature sensor detects, during the hot water storage operation, that the hot water supply operation is started.   
     
     
         6 . The storage type hot water supplying apparatus according to  claim 1 , wherein a flow sensor is provided as the hot water supply detection sensor, the flow sensor being configured to detect a water flow at the feed water inlet or a water flow at the hot water outlet, and
 the control circuitry is configured to increase the opening degree of the expansion valve when the flow sensor detects, during the hot water storage operation, that the hot water supply operation is started.   
     
     
         7 . The storage type hot water supplying apparatus according to  claim 6 , wherein the flow sensor is capable of detecting a flow rate of water passing through the feed water inlet or the hot water outlet, and
 the control circuitry is configured to increase the opening degree of the expansion valve as the flow rate increases in a case in which the hot water supply operation is started during the hot water storage operation.