Consider a steam power cycle operating according to the simple ideal Rankine cycle. The steam enters the turbine at a pressure of 4 MPa and a temperature of 400 ° C and condenses in the condenser at a pressure of 10 kPa. a) Calculate the thermal efficiency of the cycle. b) Draw the T-s diagram of the cycle.
Question 1. Consider a steam power cycle operating according to the simple ideal Rankine cycle. The steam enters the turbine at a pressure of 4 MPa and a temperature of 400 ° C and condenses in the condenser at a pressure of 10 kPa.
a) Calculate the thermal efficiency of the cycle.
b) Draw the T-s diagram of the cycle.
Question 2. A heat machine that takes 1 MW of energy from a 550 ° C hot source and works by energizing an environment with a temperature of 300 K generates 450 kW of work.
a) Calculate how much energy the heat engine gives to the environment.
b) Calculate the thermal efficiency of the heat engine.
c) If the machine operating between these two sources were a Carnot heat engine, calculate how much energy it would give to the environment and what would be the thermal efficiency if it received the same amount of energy from the hot source.
Question 3. A fixed volume closed vessel is divided into two equal compartments by a metal curtain. Initially, one compartment contains 2.5 kg of compressed liquid water at 400 kPa pressure and 60 ° C temperature, and the other contains vacuum. The curtain is then lifted and water fills the entire volume. Since the pressure in the container in the final state is 40 kPa, calculate the entropy change (kJ / K) of the water during this process.
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