Heat Pipe with Inner Zeolite Coated Structure

Abstract

The heat pipe comprises a shell and an inner zeolite coated structure. The shell has an inner surface. The inner surface surrounds an enclosed chamber. The chamber is partially filled with a working fluid in a vacuum. The working fluid may be changed into a liquid phase or a gas phase by following temperature change. The coating material comprises a zeolite, a binder and an additive. The material is sintered on the inner surface of the heat pipe. Consequently, the zeolite coating is formed between the inner surface and the enclosed chamber. Thus, the present invention uses a porous material of zeolite with pore size smaller than grooves and meshes to have excellent evaporation heat transfer and capillary force. The zeolite coating of the present invention does not fail without air isolation. The present invention is inner manufactured under atmospheric condition so has no size limitation.

What is claimed is: 
     
         1 . A heat pipe for cooling and recycling waste heat, comprising
 a shell, said shell having an inner surface, said inner surface surrounding an enclosed chamber, said enclosed chamber being partially filled with a working fluid under a vacuum, said working fluid being changed into a phase selected from a group consist of a liquid phase and a gas phase by following a temperature of said working fluid, said shell having an evaporator section and a condenser section, said condenser section being located away from said evaporator section; and   a zeolite coating, said zeolite coating being obtained between said inner surface and said enclosed chamber, said zeolite coating being coated with a material comprising a zeolite, a binder and an additive,   wherein said binder is geopolymer or expoxy, and mixed with said zeolite and said additive to obtain slurry to be sintered on said inner surface of said shell; and   wherein said zeolite coating has pores and each pore has a diameter from less than 10 nanometers to several hundred micrometers and a specific surface of 100˜600 square meters per gram (m 2 /g).   
     
     
         2 . The heat pipe according to  claim 1 ,
 wherein said shell is made of a metal having a tensile strength more than 50 kilograms per square millimeter (kg/mm 2 ) at 100˜1000 Celsius degrees (° C.).   
     
     
         3 . The heat pipe according to  claim 2 ,
 wherein said metal is selected from a group consist of carbon steel, SUS201, SUS202, SUS304, SUS316 and SUS430.   
     
     
         4 . The heat pipe according to  claim 2 ,
 wherein said metal material is a mixture of materials selected from a group consist of carbon steel, SUS201, SUS202, SUS304, SUS316 and SUS430.   
     
     
         5 . The heat pipe according to  claim 1 ,
 wherein said shell has a cross-sectional shape selected from a group consist of a round shape, an elliptic shape, a square shape, a rectangle shape and a polygon shape.   
     
     
         6 . The heat pipe according to  claim 1 ,
 wherein said cross-sectional shape of said shell has a radius of gyration of 1˜1000 mm and said shell has a slenderness ratio of 0.001˜1000.   
     
     
         7 . The heat pipe according to  claim 1 ,
 wherein said working fluid is selected from a group consist of water, an alcohol, a benzene, an alkane, a refrigerant, a synthetic oil, lithium, sodium and potassium to transfer heat by being changed into a gas phase or a liquid phase at 100˜1000° C.   
     
     
         8 . The heat pipe according to  claim 1 ,
 wherein said working fluid is added with nanometer sized powders or particles form of a high thermally conductive metal to obtain high heat transfer performance; said form is selected from a group consist of powder and particles; and said metal is selected from a group consist of silver, copper and aluminum.   
     
     
         9 . The heat pipe according to  claim 1 ,
 wherein said zeolite coating has only one layer and has a thickness of 100˜1000 micrometers (μm).   
     
     
         10 . The heat pipe according to  claim 1 ,
 wherein said zeolite coating has two layers with pores;   wherein said two layers comprises a bottom-coating layer and a top-coating layer sequentially obtained bottom-up from said inner surface; and   wherein said pores of said bottom-coating layer have larger sizes than said pores of said top-coating layer.   
     
     
         11 . The heat pipe according to  claim 1 ,
 wherein said zeolite is selected from a group consist of low-silica zeolite, intermediate-silica zeolite and high-silica zeolite.   
     
     
         12 . The heat pipe according to  claim 1 ,
 wherein said zeolite has a type of crystal and said type is selected from a group consist of MFI type, X type and A type.   
     
     
         13 . The heat pipe according to  claim 1 ,
 wherein said additive is selected from a group consist of aluminum oxide, titanium oxide, zirconium oxide and silicon oxide.   
     
     
         14 . The heat pipe according to  claim 1 ,
 wherein said additive is a mixture of materials selected from a group consist of aluminum oxide, titanium oxide, zirconium oxide and silicon oxide.   
     
     
         15 . The heat pipe according to  claim 1 ,
 wherein micro grooves are located on said inner surface of said shell and said zeolite coating is obtained on surface of said micro grooves.   
     
     
         16 . The heat pipe according to  claim 1 ,
 wherein said evaporator section is contacted with heat source selected from a group consist of corrosive gas, corrosive liquid, radioactive gas, radioactive liquid, radioactive solid, toxic gas, toxic liquid, toxic solid, smoke, waste liquid, solvent, sludge, powder, granule, sand, incinerator bottom ash, smelting furnace slag, hot spring geothermal heat, steam geothermal heat, sulfur geothermal heat and solar heat; and   wherein said heat source has a temperature of 50˜1000° C.   
     
     
         17 . The heat pipe according to  claim 1 ,
 wherein said condenser section is contacted with a heat sink selected from a group consist of air, water, a phase-changing material.   
     
     
         18 . The heat pipe according to  claim 1 ,
 wherein said condenser section is contacted with a heat sink of a material having a phase selected from a group consist of a gas phase, a liquid phase and a solid phase.