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mass flow is returned as condensate and the remaining 90% must be made up with water at a much lower temperature. Design of a System Energy Content Recoverable The first step in designing the system is to determine the amount of energy available in the exhaust gas stream. This is helpful to determine a first order analysis of the potential magnitude that can be seen by recovering the waste heat and to determine how many of the proposed projects are feasible to be implemented at once. This can be easily calculated using the first law of thermodynamics and by making the assumption that the exhaust stream temperature is reduced from the current temperature of 485°F to a temperature slightly above the dew point temperature of 255°F. This is the amount of energy that can be recovered by a typical heat exchanger and will be the amount of energy supplied to the fluid in the waste heat recovery system. . Qavailable = Vex x ρex x Cp,ex x (Thot - Tlow) = 4,050 cfm x 60 min/1 hr x 0.045 lbm/ft3 x 0.28 Btu/lbm-°F x 260 °F) x 1 MMBtu/106 Btu = 0.69 MMBtu/hr (485 °F – where Qavailable = amount of energy in the exhaust stream for desired temperature range . Vex = volumetric flow rate of exhaust gas stream ρex = density of exhaust gas stream at 485°F Cp,ex = average exhaust stream specific heat 88PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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