There is a steam power cycle that uses water as the working fluid, where the condenser pressure is 20 kPa. The pressure in the boiler is 4 MPa. The steam that comes out of the boiler is saturated steam. The water enters the pump as a saturated liquid.The isentropic efficiencies of the pump and turbine are 87% and 97% respectively. Determine a) Real work on the pump b) Heat transfer in theboiler c) The real work on the turbine d) The heat in the condenser e) The thermal efficiency of the cycle

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A heat exchanger has the objective of condensing 5 kg/s of water vapor and taking it from a pressure of 1.0 MPa and 300 °C to atmospheric pressure and 60 °C. Liquid water is used as refrigerant (Cp= 4.22 kJ/kgK), it enters at 1 °C and leaves the exchanger at 50 °C. a) What is the mass flow rate of the cold water stream? b) If the water is exchanged for another refrigerant substance whose specific heat is 2.0 kJ/kgK, what will be its outlet temperature if the same mass flow is maintained?

3) Combined Cycle (CC) Natural Gas Power: Cheap natural gas (mostly fromfracking and similar extraction techniques) and CC gas plants are one of theprimary reasons that US carbon emissions peaked in ∼2010 and has been declining. Here, natural gas powers a Brayton cycle turbine, and the exhaustfrom that turbine is then fed into a steam generator to run a Rankine cycleturbine.a) The high temperature in the Brayton cycle turbine is 1500K. The exhaust for the Braytoncycle exits at about 850K. What is the maximum efficiency that you could expect from aheat engine operating between these two temperature extremes? b) A heat exchanger is able to deliver the Brayton cycle exhaust to a Rankine (steam) cycle.The the final outgoing temperature from this steam cycle is 325K. What is the maximumefficiency that you could expect to achieve operating between the high temperature fromthe Brayton cycle and the low temperature from the Rankine cycle? (That is, what is thetheoretical max efficiency of the…