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WASTE HEAT RECOVERY

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WASTE HEAT RECOVERY ( waste-heat-recovery )

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the latent heat of the condensation. This part of the heat pipe works as the condenser region. The condensed liquid then flows back to the evaporated region. A figure of Heat pipe is shown in Figure 8.7 Performance and Advantage The heat pipe exchanger (HPHE) is a lightweight compact heat recovery system. It virtually does not need mechanical maintenance, as there are no moving parts to wear out. It does not need input power for its operation and is free from cooling water and lubrication systems. It also lowers the fan horsepower requirement and increases the overall thermal efficiency of the system. The heat pipe heat recovery systems are capable of operating at 315oC. with 60% to 80% heat recovery capability. Typical Application The heat pipes are used in following industrial applications: a. Process to Space Heating: The heat pipe heat exchanger transfers the thermal energy from process exhaust for building heating. The preheated air can be blended if required. The requirement of additional heating equipment to deliver heated make up air is drastically reduced or eliminated. b. Process to Process: The heat pipe heat exchangers recover waste thermal energy from the process exhaust and transfer this energy to the incoming process air. The incoming air thus become warm and can be used for the same process/other processes and reduces process energy consumption. c. HV AC Applications: Cooling: Heat pipe heat exchangers precools the building make up air in summer and thus reduces the total tons of refrigeration, apart from the operational saving of the cooling system. Thermal energy is supply recovered from the cool exhaust and transferred to the hot supply make up air. Heating: The above process is reversed during winter to preheat the make up air. The other applications in industries are: • Preheating of boiler combustion air • Recovery of Waste heat from furnaces • Reheating of fresh air for hot air driers • Recovery of waste heat from catalytic deodorizing equipment • Reuse of Furnace waste heat as heat source for other oven • Cooling of closed rooms with outside air • Preheating of boiler feed water with waste heat recovery from flue gases in the heat pipe economizers. • Drying, curing and baking ovens • Waste steam reclamation • Brick kilns (secondary recovery) • Reverberatory furnaces (secondary recovery) 8. Waste Heat Recovery Bureau of Energy Efficiency 10

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