Question
5. (16 marks total) m ma high pressure turbine +4 ms reheater 6 W 3 moisture low separator pressure turbine 8 7 Que DE
5. (16 marks total) m ma high pressure turbine +4 ms reheater 6 W 3 moisture low separator pressure turbine 8 7 Que DE QOUT boiler condenser 2 pump 1 Wp The sketch shows a simplified version of a Canadian nuclear power plant (CANDU) cycle. Steam leaving the high pressure turbine passes through a moisture separator, in which any liquid present in the steam is removed. The steam is then reheated by diverting a flow rate m, of steam from the boiler and mixing it with the steam leaving the separator. The following data are given for the cycle: 1: saturated liquid at 10 kPa 3: saturated vapour at 5 MPa 4: P=0.3 MPa 5: saturated vapour 6: T-150C 7: saturated liquid isentropic efficiencies: turbine (both units) n = 0.92; pump p = 0.80 (a) (2 marks) Draw a T-s diagram for this cycle and state the pressure at each numbered point of the cycle. (b) (5 marks) Determine the outlet enthalpy from the high pressure turbine h.. (c) (3 marks) Assuming the flow rate h, to be 1 kg/s, determine the mass flow rate h, of vapour leaving the separator. (d) (4 marks) Determine the mass flow rate m of reheat steam needed to produce the given reheat state T- (e) (2 marks) Calculate the specific pump work (kJ/kg) and the exit enthalpy from the pump h..
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