Method of action of the plastic heat exchanger and its constructions

Abstract

The within invention makes use of plastic tubing to create an effective two-phase heat exchanger whereby the vapor phase is collected in bubbles in the tubes separated by the areas of liquid phase. The vaporization of the liquid removes the heat, the surrounding medium and the vapor is condensed when cooled. The movement of the vapor and liquid phases is aided by the plastic walls.

I claim:  
     
         1 . A method of action of: a) a plastic tube heat exchanger, b) filled by a transitional two-phase heat carrier, c) circulating in heating and cooling zones, d) where the evaporation and condensation of the heat carrier causes circulation.  
     
     
         2 . The method of  claim 1 , where the channels are made with small diameters less than 5 mm, which are partly filled by the two-phase heat carrier.  
     
     
         3 . The method of  claim 1 , where the channels are of a diameter less than 10 mm.  
     
     
         4 . The method of  claim 1 , where the channels are of a diameter of approximately 10 mm.  
     
     
         5 . The method of a plastic heat exchanger as defined in  claim 1 , wherein the plastic material is combined with a selection from the heat carrier group: ammonia-water, ethanol-water or water-refrigerant.  
     
     
         6 . The method of action of the plastic heat exchanger as defined in  claim 5 , wherein the optimal filling by the heat carrier of the internal volume of the plastic heat exchanger is in the range 30%-70% of the total internal volume of the heating, transport and cooling zones of the plastic heat exchanger for diameters between approximately 5-10 mm.  
     
     
         7 . The method of  claim 5  wherein the volume of the heat exchanger is filled in the range of 80% to 100% for diameters of 10 mm or greater.  
     
     
         8 . The plastic heat exchanger for effecting the method to  claim 1 , comprising the continuous elongate plastic tube to form a continuous flow of the alternating liquid and vapor slugs of the heat carrier between the heating and cooling zones.  
     
     
         9 . The plastic heat exchanger according to  claim 8 , wherein, the cooling and heating zones are located in the same serpentines and they have at least one baffle, which divides these zones.  
     
     
         10 . The plastic heat exchanger according to  claim 8 , wherein the working lengths of the branches in the cooling Lc and heating Lh zones correspondingly are related each to the other as proportional values of the average total heat transfer coefficients Kc and Kh in said zones, correspondingly: Lc/Lh={square root}Kh/Kc.  
     
     
         11 . The plastic heat exchanger according to  claim 8 , wherein inside serpentines are installed frames or inserts and other accommodations to fix the pitches between the branches and exclude bypass of flow.  
     
     
         12 . The plastic heat exchanger according to  claim 8 , wherein the branches contain at least one porous insert, which covers at least one cross-section area of the place of the branch, and said insert embodies the azimuth and axial channels which is located on the outer surface of the insert.  
     
     
         13 . The plastic heat exchanger according to  claim 1 , where the plastic material of the tubes has high thermal conductivity, 1) the plastic heat exchanger of  claim 1  wherein the outer surface of the cooling and heating zones embodies the plastic fins, height which satisfy the condition: 
         h δ2 α/λfδf≦ 1, 
       where: h—height of the plastic fin, α—coefficient of heat transfer, λf and δf—thermal conductivity and thickness of the plastic fin.