Heat exchanger and air conditioning system

Abstract

A heat exchanger installed under the ground or water includes an outer pipe installed vertically or installed inclinedly under the ground or water; and a heating heat-transfer pipe inserted into the outer pipe, and evaporating refrigerant injected thereto. A heat medium is sealed in the outer pipe. A heat exchange is performed by using a change in phase of the heat medium and a heat medium guiding section for guiding the heat medium condensed on an outer surface of the heating heat-transfer pipe to an inner wall surface of the outer pipe by using surface tension of the heat medium or by reducing an angle of contact on the inner surface is formed in an upper section of the outer pipe.

1 . A heat exchanger, comprising:
 an outer pipe installed vertically or installed inclinedly under the ground or water;   a heating heat-transfer pipe which is inserted into the outer pipe, and which evaporates refrigerant injected thereto; and   a heat medium sealed in the outer pipe,   wherein a heat exchange is performed by using a change in phase of the heat medium; and   a heat medium guiding section for guiding the heat medium condensed on an outer surface of the heating heat-transfer pipe to an inner wall surface of the outer pipe by using surface tension of the heat medium or by reducing an angle of contact on the inner surface is formed in an upper section of the outer pipe.   
     
     
         2 . The heat exchanger of  claim 1 , wherein
 the heating heat-transfer pipe is formed in coiled shape.   
     
     
         3 . The heat exchanger of  claim 1 , wherein
 a wick is provided along the inner wall surface of the outer pipe inside the outer pipe.   
     
     
         4 . The heat exchanger of  claim 1 , wherein
 grooves for holding the heat medium by using surface tension of the heat medium or by reducing an angle of contact on the inner wall surface are formed in the inner wall surface of the outer pipe.   
     
     
         5 . An air conditioning system, comprising:
 the heat exchanger of  claim 1 ,   wherein a refrigeration cycle is performed.