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Thot = temperature of the initial exhaust gas stream Tlow = temperature the exhaust gas is to be cooled to after heat exchanger The energy that can be recovered in by the condensing economizer can be calculated in a similar fashion but also considering the latent heat recovered from condensing the water vapor from the exhaust stream. This condensed water vapor will be used to supply hot feed-water into the boiler while the remainder of the energy recovered will be added to the a second fluid transport system. This process is shown below and assumes the condensing economizer will reduce the exhaust temperature from the previous heat exchanger exhaust temperature to 135°F and that all the moisture added during the combustion process will be condensed. Qcond = mex x Cp,ex,2 x (Thot,2 - Tlow,2) + LH x WV x FR . = 0.9 MMBtu/hr where Qcond = amount of energy in the exhaust stream for desired temperature range . Cp,ex,2 = average exhaust stream specific heat Thot = temperature of the inlet exhaust gas stream (from previous HX) Tlow = temperature the exhaust gas is to be cooled to after heat exchanger LH = latent heat of vaporization of water = [10,935 lbm/hr x 0.28 Btu/lbm-°F x (260 °F – 135 °F) + 970.3 Btu/lbm H2O x 41.9 lbm H2O/ 1 MMBtu NG x 12.55 MMBtu NG/hr] x 1 MMBtu/106 Btu mex = because of conservation of mass, the same mass flow rate must enter the second heat exchanger as the first 89PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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