Storage type hot water supplying apparatus

Abstract

A storage type hot water supplying apparatus according to the present disclosure includes a hot water storage tank, and a condenser located at the hot water storage tank, the condenser including a helical refrigerant pipe centered on a vertical line. The condenser has an upper part and a lower part located lower than the upper part. A vertical length of a vertical cross-sectional shape of the refrigerant pipe in the lower part of the condenser is shorter than a vertical length of a vertical cross-sectional shape of the refrigerant pipe in the upper part of the condenser. A pitch of a helix formed by the refrigerant pipe in the lower part of the condenser may be smaller than a pitch of a helix formed by the refrigerant pipe in the upper part of the condenser.

1 . A storage type hot water supplying apparatus, comprising:
 a hot water storage tank; and   a condenser located at the hot water storage tank and including a refrigerant pipe that is centered on a vertical line and that has a helical shape,   wherein the condenser has an upper part and a lower part located lower than the upper part,   and wherein a vertical length of a vertical cross-sectional shape of the refrigerant pipe in the lower part of the condenser is shorter than a vertical length of a vertical cross-sectional shape of the refrigerant pipe in the upper part of the condenser.   
     
     
         2 . The storage type hot water supplying apparatus according to  claim 1 , wherein a pitch of a helix formed by the refrigerant pipe in the lower part of the condenser is smaller than a pitch of a helix formed by the refrigerant pipe in the upper part of the condenser. 
     
     
         3 . The storage type hot water supplying apparatus according to  claim 1 , wherein the vertical length of the vertical cross-sectional shape of the refrigerant pipe in the upper part of the condenser is 1.1 times or more and 3 times or less the vertical length of the vertical cross-sectional shape of the refrigerant pipe in the lower part of the condenser. 
     
     
         4 . The storage type hot water supplying apparatus according to  claim 1 , wherein a vertical dimension of the upper part of the condenser is 1.2 times or more and 20 times or less a vertical dimension of the lower part of the condenser. 
     
     
         5 . The storage type hot water supplying apparatus according to  claim 1 , wherein the number of turns of a helix formed by the refrigerant pipe in the upper part of the condenser is larger than the number of turns of a helix formed by the refrigerant pipe in the lower part of the condenser. 
     
     
         6 . The storage type hot water supplying apparatus according to  claim 1 , wherein the refrigerant pipe is wound around the hot water storage tank at a position between a heat insulating material and a surface of the hot water storage tank, the heat insulating material covering an outer periphery of the hot water storage tank. 
     
     
         7 . The storage type hot water supplying apparatus according to  claim 1 , wherein a value obtained by dividing the vertical length of the vertical cross-sectional shape of the refrigerant pipe by a horizontal length of the vertical cross-sectional shape of the refrigerant pipe is used as an aspect ratio, and
 an aspect ratio of the refrigerant pipe in the lower part of the condenser is smaller than an aspect ratio of the refrigerant pipe in the upper part of the condenser.   
     
     
         8 . The storage type hot water supplying apparatus according to  claim 1 , comprising:
 a compressor configured to compress refrigerant; and   a refrigerant passage configured to couple the compressor to the condenser, wherein   the refrigerant flows from the refrigerant pipe in the upper part of the condenser to the refrigerant pipe in the lower part of the condenser.   
     
     
         9 . The storage type hot water supplying apparatus according to  claim 8 , wherein, during a hot water storage operation, being an operation that supplies the refrigerant from the compressor to the condenser, the refrigerant pipe in the lower part of the condenser is filled with refrigerant in a liquid phase, and the refrigerant pipe in the upper part of the condenser is filled with refrigerant in a superheated gas state or refrigerant in a gas-liquid two-phase state. 
     
     
         10 . The storage type hot water supplying apparatus according to  claim 1 , wherein the vertical cross-sectional shape of the refrigerant pipe in the upper part of the condenser is a cocoon shape or an elliptical shape. 
     
     
         11 . The storage type hot water supplying apparatus according to  claim 1 , wherein the vertical cross-sectional shape of the refrigerant pipe in the lower part of the condenser is a D shape, a circular shape, or a C shape.