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Rankine Cycles

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Consider an ideal steam reheat and regenerative cycle where steam leaves a steam gen and enters a high pressure turbine at 3 Mpa and T=400 C and is extracted to an open feedwater heater at 0.8 Mpa. The remainder is reheated to 400 C at this pressure which flows to the low pressure turbine stage. The condenser saturation pressure is 10 Kpa. Determine the thermal efficiency of the cycle and the net specific work. Assume each turbine stage isentropic efficiency to be 99% and assume the FWH is open.

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Solution Summary

This solution provides a detailed, step-by-step process to finding thermal efficiency and net specific work in an ideal steam reheat and regenerative cycle. Equations and diagrams are provided to enhance learning of the concept.

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Thermodynamics Rankine cycle efficiency problem

An ideal reheat Rankine cycle operates between the pressure limits of 20 kPa and 8 MPa, with reheat occurring at 3 MPa. The temperature of steam at the inlets of both turbines is 500°C, and the enthalpy of steam is 3104 kJ/kg at the exit of the high-pressure turbine, and 2385 kJ/kg at the exit of the low-pressure turbine. Disregarding the pump work, the cycle efficiency is:

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