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Thermal Energy Equipment: Waste Heat Recovery Source Temperature 0C Forming dies Air compressors Pumps Internal combustion engines Air conditioning and refrigeration condensers Liquid still condensers Drying, baking and curing ovens Hot processed liquids Hot processed solids 3.2 Determining the Waste Heat Quantity 27-88 27-50 27-88 66-120 32–43 32-88 93-230 32-232 93-232 In any heat recovery situation it is essential to know the amount of heat recoverable and also its usage. The total heat that could potentially be recovered can be calculated using this formula: Where, Q is the heat content in kcal V is the flow rate of the substance in m3/hr ρ is density of the flue gas in kg/m3 Cp is the specific heat of the substance in kCal/kg oC ∆T is the temperature difference in oC Example A large paper manufacturing company identifies an opportunity to save money by recovering heat from hot wastewater. The discharge of the wastewater from the operation range is 10000 kg/hr at 750C. Rather than discharging this water to drain, it was decided to preheat the 10000 kg/hr of cold inlet water having a yearly average temperature of 200C, by passing it through a counterflow heat exchanger with automatic back flushing to reduce fouling. Based on a heat recovery factor of 58% and an operation of 5000 hours per year, the annual heat saving (Q) is: Q = m x η x Cp x ∆T Where, Q is the heat content in kcal m is the mass flow rate Cp is the specific heat of the substance in kcal/kg oC, in the case water ∆T is the temperature difference in oC η is the recovery factor Therefore, for this example m = 1000 kg/hr = 10000 x 5000 kg/yr = 50000000 kg/year Cp = 1 kCal/kg0C Q = V x ρ x Cp x ∆ T Energy Efficiency Guide for Industry in Asia –www.energyefficiencyasia.org ©UNEP 14PDF Image | Thermal Energy Equipment Waste Heat Recovery
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