Vapor Cycle Exergy Analysis
In a cogeneration system, a Rankine cycle operates with steam entering the turbine at 800 lbf/in.2, 700°F, and a condenser pressure of 180 lbf/in.2 The isentropic turbine efficiency is 80%. Energy rejected by the condensing steam is transferred to a separate process stream of water entering at 250°F, 140 lbf/in.2 and exiting as saturated vapor at 140 lbf/in.2 Determine the mass flow rate, in lb/h, for the working fluid of the Rankine cycle if the mass flow rate of the process stream is 50,000 lb/h. Devise and evaluate an exergetic efficiency for the overall cogeneration system. Let T0 = 70°F, p0 = 14.7 lbf/in.2
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