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Question: 5 a a combined boiler superheater unit generates 15 kgs...

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5 (a A combined boiler superheater unit generates 15 kg/s of steam at a pressure and temperature of 80 bars and 500 C respectively. Compressed water enters the unit at a temperature of 50 C and a velocity of 2 m/s. Determine:- (i) he total change in the entropy of the water/steam as it passes the unit; (i) the diameter of the inlet to the unit A laboratory heat pump system, shown schematically in Fig. Q5 (b), uses ISCEON 49 as the working fluid and operates on the ideal vapour-compression refrigeration cycle between 3 bar and 12 bar. The working fluid (refrigerant) enters the compressor unit of the heat pump in a fully saturated vapour state. The mass flow rate of the refrigerant is 0.02 kg/s. sketch the cycle orn the attached pressure-enthalpy diagram and determine: (b) Sketch the cycle on the attached pressure-enthalpy diagram and determine hi, h2, hs and h. (i) () Calculate the power input to the compressor if its mechanical efficiency is 0.9. (ii) What is the rate of heat removal from the refrigerated space? (iv) What is the heat rejection rate to the environment? Determine the coefficient of performance of the refrigerator. (v)

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