A superheat Rankine cycle power plant consists of a pump, a boiler/superheater,

Question

A superheat Rankine cycle power plant consists of a pump, a boiler/superheater, a pair of turbines, a reheater, and a compressor. Saturated liquid water at 10 kPa enters the pump (n = 0.90) and exits at 15 bar. The inlet temperature for the first turbine remains the same and the isentropic efficiency is 0.98. The inlet temperature for the second turbine is 400 C, and its isentropic efficiency is 0.98. Answer the following:

Is the total turbine/reheater specific entropy generation greater, equal to or less than the turbine specific entropy generation from the SP-34 case?

Compute the thermal efficiencies for the two cycles.

Compute the specific entropy generations for the two cycles.

Based your answers for sgeneration and hcycle, which design would you recommend?

Explanation / Answer

The answer of following question is as follows .

The thermal efficiency of the cycle is 67% and 89% .

The specific entropy generation for the two cycles is 58kj/kg new 67kj/kg.

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