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Thermal Energy Equipment: Waste Heat Recovery ∆T = (75 –20) 0C = 55 0C η = Heat Recovery Factor = 58% or 0.58 The calculation of Q is as follows: Q = 50000000 x 1 x 55 x 0.58 = 1595000000 kCal/year Gross calorific value (GCV of oil) = 10,200 kCal/kg Equivalent oil savings = 159500000 / 10200 = 156372 liters Cost of oil = 0.35 US$/liter Financial savings = 54730 US$/year 4. ENERGY EFFICIENCY OPPORTUNITIES Areas for potential waste recovery are dependent on the type of industrial process, and are therefore covered in other energy equipment modules. 5. OPTION CHECKLIST The most important options to maximize energy efficiency when applying waste heat recovery are ß Recover heat from flue gas, engine cooling water, engine exhaust, low pressure waste steam, drying oven exhaust, boiler blowdown, etc. ß Recover heat from incinerator off-gas. ß Use waste heat for fuel oil heating, boiler feedwater heating, outside air heating, etc. ß Use chiller waste heat to preheat hot water. ß Use heat pumps. ß Use absorption refrigeration. ß Use thermal wheels, run-around systems, heat pipe systems, and air-to-air exchangers. Options to recover waste heat are covered in other energy equipment modules. Energy Efficiency Guide for Industry in Asia –www.energyefficiencyasia.org ©UNEP 15PDF Image | Thermal Energy Equipment Waste Heat Recovery
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