Hot water supply heat exchanger

Abstract

A hot water supply heat exchanger includes a water pipe ( 1 ) including a water pipe (W) and a refrigerant pipe ( 2 ) forming a refrigerant passage (R) and heats water flowing through the water passage (W) by a refrigerant flowing through the refrigerant passage (R). An inlet part (A) of the water passage (W) including water of a predetermined temperature or less is provided with a heat transfer enhancer. This sharply enhances the performance of the whole heat exchanger.

1 . A hot water supply heat exchanger comprising a water pipe ( 1 ) forming a water passage (W) and a refrigerant pipe ( 2 ) forming a refrigerant passage (R), the hot water supply heat exchanger being for heating water flowing through the water passage (W) by a refrigerant flowing through the refrigerant passage (R), 
 wherein an inlet part (A) of the water passage (W) having water of a predetermined temperature or less is provided with a heat transfer enhancer.    
   
   
       2 . A hot water supply heat exchanger comprising a water pipe ( 1 ) forming a water passage (W) and a refrigerant pipe ( 2 ) forming a refrigerant passage (R), the hot water supply heat exchanger being for heating water flowing through the water passage (W) by a refrigerant flowing through the refrigerant passage (R), 
 wherein a part of the water pipe ( 1 ) forming an inlet part (A) of the water passage (W) having water of a predetermined temperature or less is provided with a heat transfer enhancement pipe section.    
   
   
       3 . A hot water supply heat exchanger comprising a plurality of heat exchanger units (H, H, . . . ) each including a water pipe ( 1 ) forming a part of a water passage (W) and a refrigerant pipe ( 2 ) forming a part of a refrigerant passage (R), said plurality of heat exchanger units (H, H, . . . ) being stacked one above another, the water pipes ( 1 ) being connected to one another to form a continuous water passage (W), the refrigerant pipes ( 2 ) being connected to one another to form a continuous refrigerant passage (R), said hot water supply heat exchanger being for heating water flowing through the water passage (W) by a refrigerant flowing through the refrigerant passage (R), 
 wherein an inlet part (A) of the water passage (W) including water of a predetermined temperature or less is provided with a heat transfer enhancer.    
   
   
       4 . A hot water supply heat exchanger comprising a plurality of heat exchanger units (H, H, . . . ) each including a water pipe ( 1 ) forming a part of a water passage (W) and a refrigerant pipe ( 2 ) forming a refrigerant passage (R), said plurality of heat exchanger units (H, H, . . . ) being stacked one above another, the water pipes ( 1 ) being connected to one another to form a continuous water passage (W), the refrigerant pipes ( 2 ) being connected to one another to form a continuous refrigerant passage (R), said hot water supply heat exchanger being for heating water flowing through the water passage (W) by a refrigerant flowing through the refrigerant passage (R), 
 wherein a heat transfer enhancement pipe is used as the water pipe ( 1 ) corresponding to an inlet part (A) of the water passage (W).    
   
   
       5 . The hot water supply heat exchanger of  claim 1  or  3 , wherein 
 spiral grooves ( 7 ,  7 , . . . ) formed in the inner surface of the water pipe ( 1 ) are adopted as the heat transfer enhancer.    
   
   
       6 . The hot water supply heat exchanger of  claim 2  or  4 , wherein 
 an internally-grooved pipe provided at its inner surface with spiral grooves ( 7 ,  7 , . . . ) is adopted as the heat transfer enhancement pipe.    
   
   
       7 . The hot water supply heat exchanger of any one of claims  1  through  4 , wherein 
 the refrigerant pipe ( 2 ) is connected to the periphery of the water pipe ( 1 ).