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Question 3 Part A: 22 marks A boiling water type nuclear reactor operates using the rankine cycle. The reactor core is maintained at a pressure of 48 bar and the condenser pressure is 0.1 bar. The steam is superheated to 350°C before passing into a single stage steam turbine. The reactor is connected to 2 turbine sets, each with a mass flow rate of 40 kg/s calculate: 1) The dryness fraction of the steam at exit from the turbine [5] i) The ideal and actual enthalpy of wet steam at the turbine exit, assuming a turbine efficiency of 87% [6] i) The Net power output of the power plant from both turbines [5] iv) The rate of heat supply to each turbine and overall efficiency of the power station [6] You may use the following information, as well as the properties below and the steam chart on page 6. = . S [kJ kg 'K) 7.499 5.9725 W = h,-ih h=h, +4h - h) • properties of water and wet steam р h, ho SI [bar] [kJ kg 11 [kJ kg '1 kJ kg'K') 0.1 191.83 2583.8 0 6493 48 1154 22 2793.7 292013 properties of water р S h [bar] [kJ kg 'K'] kJ kg') 48 0.6493 192.8 properties of superheated steam р t S (bar) ro [KJ kg") [kJ kg'') 48 350 3159.1 6.45 . • 5

Part B: 8 marks A double-glazed window is 0.85m high and 1.8m long. It consists of 2 sheets of glass 5mm thick (k = 0.78 W/m°C) seperated by a 8mm wide stagnant air gap (k = 0.026 W/m°C). Assuming an internal surface temperature of 20°C and -10°C outside, as well as internal and external heat transfer co-efficients of 12 W/m2 °C and 42 W/m2 °C respectively Determine i) the overall heat transfer co-efficient and ii) the rate of heat transfer. Total marks (30) t[C] ៖ 6094 000 000 000 h (kJ/kg] 100 300% ove P [MPa] 2000 100 60 40 N 20 10 5 2 s [kJ/kg) 1 05 02 2800 2700 2800 h [kJ/kg) Figure 30.1 6