Heat exchanger for thermal energy engine

Abstract

A heat exchanger for thermal energy engine comprises a hollow casing, a hollow top-plate, a hollow bottom-plate and a replaceable heat-exchanging medium. The hollow top-plate and the hollow bottom-plate have a plurality of air-ventilating orifices and arranged on a topside and a bottom side of the hollow casing, respectively. The replaceable heat-exchanging medium is placed within an accommodating space confined by the hollow casing, the hollow top-plate, and the hollow bottom-plate and provides heat-accumulation function to air flowing through the orifices and passing the heat-exchanging medium, whereby thermal loss is reduced.

I claim:  
     
         1 . A heat exchanger for thermal energy engine, comprising 
 a hollow casing;    a hollow top-plate arranged on a topside of the hollow casing and having a central aperture and a plurality of air-ventilating orifices around the central aperture;    a hollow bottom-plate arranged on bottom side of the hollow casing and having a central aperture and a plurality of air-ventilating orifices around the central aperture; and    a replaceable heat-exchanging medium placed within an accommodating space confined by the hollow casing, the hollow top-plate, and the hollow bottom-plate;    the heat exchanger forming a porous frame and the replaceable heat-exchanging medium providing heat-accumulation function to air flowing through the orifices and passing the heat-exchanging medium, whereby thermal loss is reduced.    
     
     
         2 . The heat exchanger for thermal energy engine as in  claim 1 , wherein the hollow casing is of annulus shape.  
     
     
         3 . The heat exchanger for thermal energy engine as in  claim 2 , wherein the central aperture of the hollow top-plate and the central aperture of the hollow bottom-plate are matched with the annulus shape of the hollow casing.  
     
     
         4 . The heat exchanger for thermal energy engine as in  claim 1 , wherein the replaceable heat-exchanging medium is selected from a group consisting of metal wire, ceramic material, copper wire and silvery wire.