Question

4. A steam plant operates on a thermodynamic cycle based on two isobaric processes and two isentropic processes. Pure water enters the plant at a rate of 10 kg s1 at80 bar and the saturation temperature. It is isobarically heated to 550 °C and then isentropically expanded through a turbine to 0.5 bar. It is then cooled to the same entropy as the inlet water before being compressed back to the inlet conditions.Calculate the following by using a steam table. (a) The steam state and properties after each process; (b) the heat transfer rates; (c) the network transferred; (d) the process thermal efficiency. (e) Calculate the possible thermodynamic efficiency of such a power generation cycle with the furnace operation condition fixed. Comment on the efficiency and practicality of the power generation cycle.

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