Heat exchanger

Abstract

A heat exchanger having an outer tube through which a heating or cooling medium flows, a heat source that heats or cools the outer tube at a middle position at the exterior, and a heat-exchange part which can perform a heat exchange between the heating or cooling medium flows in the outer tube and the heat source; the heat-exchange part is provided with a porous body in a cylindrical shape being in close contact with an inner peripheral surface of the outer tube, at least one inside channel that is formed inside the porous body, and at least one valve that opens and closes the inside channel; and continuous pores that communicate with both ends of the flow direction of the heating or cooling medium and through which the heating or cooling medium can flow are formed.

1 . A heat exchanger comprising
 an outer tube through which a heating or cooling medium flows,   a heat source which heats or cools a middle position of the outer tube from an outside, and   a heat-exchange part which can perform heat exchanging between the heat source and the heating or cooling medium flowing through the outer tube, wherein   the heat-exchange part is provided with a porous body which is a cylindrical shape adhering to an inner peripheral surface of the outer tube, at least one inside channel formed inside the porous body, and at least one valve opens and closes the inside channel, and   in the porous body, continuous pores communicating both ends of the heating or cooling medium in a flowing direction of the heating or cooling medium through which the heating or cooling medium can flow are formed.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein a porosity of the porous body is 60% or more and 90% or less. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein a pressure drop between an upstream position and a downstream position of the porous body when the heating or cooling medium flows in the outer tube is that a pressure drop ratio (ΔP2/ΔP1) is one or more and three or less, where a pressure drop is ΔP1 when a surface of the porous body is closed at the upstream side and only the inside channel is open and a pressure drop is ΔP2 when the valve is closed and it flows only in the porous body. 
     
     
         4 . The heat exchanger according to  claim 2 , wherein a pressure drop between an upstream position and a downstream position of the porous body when the heating or cooling medium flows in the outer tube is that a pressure drop ratio (ΔP2/ΔP1) is one or more and three or less, where a pressure drop is ΔP1 when a surface of the porous body is closed at the upstream side and only the inside channel is open and a pressure drop is ΔP2 when the valve is closed and it flows only in the porous body. 
     
     
         5 . The heat exchanger according to  claim 1 , wherein a plurality of the inside channels are provided and have the valve respectively. 
     
     
         6 . The heat exchanger according to  claim 1 , wherein the valve is enabled to control opening individually.