Question 2 (35 marks) (a) For the following, determine the state of the "water". Give reasons for your answers. (i) P =

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Question 2 35 Marks A For The Following Determine The State Of The Water Give Reasons For Your Answers I P 1 (129.01 KiB) Viewed 38 times

Question 2 (35 marks) (a) For the following, determine the state of the "water". Give reasons for your answers. (i) P = 3 bar, v = 0.60582 m3/kg (ii) T = 76°C, P = 32 kPa (ii) P = 14 bar, h = 2853 kJ/kg (iv) P = 1.6 bar, T = 359 K (6 marks) (b) It is claimed that the efficiency of a completely reversible heat engine can be doubled by doubling the temperature of the energy source. Justify the validity of this claim. (5 marks) (c) For a reheat Rankine cycle, is there an optimal pressure for reheating the steam, provide explanations to your answer. (6 marks) (d) A steam power plant operates on a reheat Rankine cycle. The net power output of this plant is 150 MW. Assume the steam enters the high-pressure turbine at 9 MPa and 500°C and the low- pressure turbine at 1 MPa and 500°C, leaves the condenser as a saturated liquid at a pressure of 10 kPa. Given the isentropic efficiency of the turbine is 75%, and that of the pump is 85%, complete the following questions i. Show the cycle on a T-s diagram with respect to saturation lines (3 marks) ii. Determine the dryness fraction (or temperature, if superheated) of the steam at the turbine exit (5 marks) iii. Calculate the thermal efficiency of the cycle (5 marks) iv. Estimate the mass flow rate of the steam in order to achieve the above net power output (5 marks)