Considering Other Vapor Cycle Aspects
A binary vapor cycle consists of two Rankine cycles with steam and ammonia as the working fluids. In the steam cycle, superheated vapor enters the turbine at 900 lbf/in.2, 11008F, and saturated liquid exits the condenser at 140oF. The heat rejected from the steam cycle is provided to the ammonia cycle, producing saturated vapor at 120oF, which enters the ammonia turbine. Saturated liquid leaves the ammonia condenser at 75oF. Each turbine has an isentropic efficiency of 90% and the pumps operate isentropically. The net power output of the binary cycle is 7 X 107 Btu/h.
(a) Determine the quality at the exit of each turbine, the mass flow rate of each working fluid, in lb/h, and the overall thermal efficiency of the binary cycle.
(b) Compare the binary cycle performance to that of a single Rankine cycle using water as the working fluid and condensing at 75oF. The turbine inlet state, isentropic turbine efficiency, and net power output all remain the same.
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