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WASTE HEAT RECOVERY Classification

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WASTE HEAT RECOVERY Classification ( waste-heat-recovery-classification )

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8. Waste Heat Recovery TABLE 8.4 TYPICAL WASTE HEAT TEMPERATURE AT LOW TEMPERATURE RANGE FROM VARIOUS SOURCES Source Temperature, °C Process steam condensate 55–88 Cooling water from: Furnace doors 32–55 Bearings 32–88 Welding machines 32–88 Injection molding machines 32–88 Annealing furnaces 66–230 Forming dies 27–88 Air compressors 27–50 Pumps 27–88 Internal combustion engines 66–120 Air conditioning and refrigeration condensers 32–43 Liquid still condensers 32–88 Drying, baking and curing ovens 93–230 Hot processed liquids 32–232 Hot processed solids 93–232 8.3 Benefits of Waste Heat Recovery Benefits of 'waste heat recovery' can be broadly classified in two categories: Direct Benefits: Recovery of waste heat has a direct effect on the efficiency of the process. This is reflected by reduction in the utility consumption & costs, and process cost. Indirect Benefits: a) Reduction in pollution: A number of toxic combustible wastes such as carbon monoxide gas, sour gas, carbon black off gases, oil sludge, Acrylonitrile and other plastic chemicals etc, releasing to atmosphere if/when burnt in the incinerators serves dual purpose i.e. recovers heat and reduces the environmental pollution levels. b) Reduction in equipment sizes: Waste heat recovery reduces the fuel consumption, which leads to reduction in the flue gas produced. This results in reduction in equipment sizes of all flue gas handling equipments such as fans, stacks, ducts, burners, etc. c) Reduction in auxiliary energy consumption: Reduction in equipment sizes gives additional benefits in the form of reduction in auxiliary energy consumption like electricity for fans, pumps etc.. Bureau of Energy Efficiency 176

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