Heat exchanger

Abstract

Heat exchanger ( 30 ), comprising a thermopositive core part ( 31 ) and thermopositive heat transfer elements ( 32 ), which are wires, bristles, fibers, strips or equivalent, preferably copper wires or carbon fibers. The heat transfer wires are squeezed between tubes or rods twisted about each other.

1 . Heat exchanger ( 30 ), which comprises a thermopositive core part ( 31 ) and thermopositive heat transfer elements ( 32 ), and in which heat exchanger 
 the heat transfer elements ( 32 ) are thin and elongated objects, such as wires, bristles, fibers, strips or equivalent,    the core part ( 31 ) comprises at least two compression surfaces or pieces with a compression gap between them where the heat transfer elements ( 32 ) are squeezed so as to allow conduction of heat from the compression surfaces or pieces to the heat transfer elements or vice versa,    the heat transfer elements ( 32 ) are so mounted in the compression gap between the compression surfaces or pieces that at least part of the length of the thin wires, bristles, fibers, strips or equivalent of the heat transfer elements remains outside the compression gap, characterized in that    the core part ( 31 ) of the heat exchanger ( 30 ) comprises at least one helical elongated body, such as a spiral tube or a rod bent like a helical spring, or two or more bodies, such as tubes or rods, twisted about each other,    and that the heat transfer elements ( 32 ) of the heat exchanger ( 30 ), such as wires, bristles, fibers, strips or equivalent, are squeezed between the helices of the helical body or between the bodies twisted about each other.    
     
     
         2 . Heat exchanger ( 30 ) as defined in  claim 1 , characterized in that 
 the core part ( 30 ) of the heat exchanger ( 30 ) comprises 
 one helical tube or one rod bent like a helical spring, or  
 one tube or rod bent over, in which the two tube or rod portions placed against each other have been twisted about each other, or  
 two or more tubes or rods ( 31   a ,  31   b ) placed against each other and twisted about each other,  
   and that opposite ends of the heat transfer elements ( 32 ), such as wires, bristles, fibers, strips or equivalent, extend in opposite directions from the compression gap between the helices of the core part ( 31 ) or between the bodies or parts thereof twisted about each other, on both sides of the compression gap.    
     
     
         3 . Heat exchanger ( 30 ) as defined in  claim 1  or  2 , characterized in that 
 the heat transfer elements ( 32 ) of the heat exchanger ( 30 ), such as wires, bristles, fibers, strips or equivalent, are squeezed by their midpoint in the compression gap between the bodies of the core part ( 31 ) twisted about each other or between parts thereof,  
 and that the ends of the heat transfer elements ( 32 ) diverging radially in different directions from the compression gap of the core part ( 31 ) are of equal length so that the heat exchanger ( 30 ) has a mainly circular cross-sectional form.  
 
     
     
         4 . Heat exchanger ( 30 ) as defined in  claim 1 ,  2  or  3 , characterized in that 
 the core part ( 31 ) of the heat exchanger ( 30 ) comprises a bent-over elongated body, such as tube or rod, in which the two parts bent against each other have been twisted about each other,  
 and that the heat transfer elements ( 32 ), such as wires, bristles, fibers, strips or equivalent, are squeezed in the compression gap between the two parts of the elongated body ( 31 ) twisted about each other.  
 
     
     
         5 . Heat exchanger ( 30 ) as defined in any one of claims  1 - 4 , characterized in that 
 the core part ( 31 ) of the heat exchanger ( 30 ) comprises a bent-over tube whose two parts placed against each other have been twisted about each other,    that the heat transfer elements ( 32 ), such as wires, bristles, fibers, strips or equivalent, are squeezed in the compression gap between the two parts of the bent over tube twisted about each other,    and that an outlet ( 34 ) for a heat transfer medium, such as a liquid, vaporized liquid, condensable vapor or a flowing gas, is located at the same end of the heat exchanger as the inlet ( 33 ) for the medium.    
     
     
         6 . Heat exchanger ( 30 ) as defined in any one of claims  1 - 5 , characterized in that two or more heat exchangers ( 30   a ,  30   b ) formed from helical tube are connected in parallel in the same space so that the inlet orifices ( 33 ) of the heat exchangers for the supply of a heat transfer medium are connected together and similarly the outlet orifices ( 34 ) of the heat exchangers are connected together.  
     
     
         7 . Heat exchanger ( 30 ) as defined in any one of claims  1 - 6 , characterized in that one or more heat exchangers ( 30 ) formed from helical tube are implemented as a separate unit ( 40 ) of preferably circular cross-section and so designed that it can be easily mounted in and removed from its place of installation ( 50 ), which preferably is a ventilation duct of circular cross-section.  
     
     
         8 . Heat exchanger ( 30 ) as defined in any one of claims  1 - 7 , characterized in that the heat transfer wires ( 32 ) placed in the compression gap between the tubes ( 31 ) or tube portions of the heat exchanger ( 30 ) twisted about each other are at least partially immersed in a liquid ( 62 ) to be vaporized.  
     
     
         9 . Heat exchanger ( 30 ) as defined in any one of claims  1 - 8 , characterized in that the heat transfer wires ( 32 ) placed in the compression gap between the tubes ( 31 ) or tube portions of the heat exchanger ( 30 ) twisted about each other are at least partially located in a vapor space where condensation of vapor occurs on the surface of the heat transfer wires.  
     
     
         10 . Heat exchanger ( 30 ) as defined in any one of claims  1 - 9 , characterized in that the heat transfer wires ( 32 ) squeezed between the tubes ( 31 ) or tube portions of the heat exchanger ( 30 ) twisted about each other are copper wires, aluminum wires or carbon fibers.