2. INTRODUCTION. DESIGN CONSIDERATION. WORKING PRINCIPLE. SELECTIONED SIDE AND FRONT VIEW REPRESENTATION. TYPES OF HEAT PIPE. APPLICATIONS. ADVANTAGES AND DISADVANTAGES. CONCLUSION.

3. A HEAT PIPE IS A DEVICE THAT CAN QUICKLY TRANSFER HEAT FROM ONE POINT TO ANOTHER.  THEY ARE ALSO REFFERED TO AS THE “SUPERCONDUCTORS’’ OF HEAT AS THEY POSSESS AN EXTRA ORDINARY HEAT TANSFER CAPACITY AND WITH ALMOST NO HEAT LOSS

4. THREE BASIC COMPONENTS OF A HEAT PIPE ARE: 1. CONTANR 2. WORKING FLUID 3. WICK OR CAPILLARY STRUCTURE

5. ( 1)CONTAINER – THE FUNCTION OF THE CONTAINER IS TO ISOLATE THE WORKING FLUID FROM OUTSIDE ENVIRONMENT. SELECTION OF CONTAINER MATERIAL DEPENDS ON FACTOR ARE: (A) COMATIBILITY (B) ST RENGTH TO WEIGHT RATIO (C) THERMAL CONDUCTIVITY (D) POROSITY

6. (2) WORKING FLUID A FAST CONSIDERATION IN THE IDENTIFICATION OF A SUITABLE WORKING FLUID IS THE OPERATING VAPOUR TEMPERATURE RANGE GGOOD THERMAL STABILITY HHIGH LATENT HEAT HHIGH THERMAL CONDUCTIVITY LLOW LIQUID AND VAPOR VISCOSITIES HHIGH SURFACE TENSION

7. IT IS A POROUS STRUCTURE MADE OF MATERIALS LIKE STEEL, ALUMUNIUM, NICKEL OR COPPER IN VARIOUS RANGES OF PORE SIZES. THEY ARE FABRICATED USING METAL FOAMS, AND MORE PARTICULARLY FELTS, THE LATTER BEING MORE FREQUENTLY USED.

8. ONE END OF THE TUBE IS HEATED AND THE OTHER IS COOLED. THE HEAT SOURCE (THE EVAPORATOR) CAUSES THE FLUID TO BOIL AND TURN TO VAPOR.WHEN THAT HAPPENS, THE LIQUID PICKS UP THE LATENT HEAT OF VAPORIZATION. THE GAS, WHICH THEN HAS A HIGHER PRESSURE, MOVES INSIDE THE SEALED CONTAINER TO A COLDER LOCATION WHERE IT CONDENSES. ONCE THE VAPOR REACHES THE COLD END OF THE TUBE (THE CONDENSER), THE FLUID CHANGES PHASE AGAIN FROM VAPOR BACK TO A LIQUID.