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# me212mid1 - a Draw T-s diagram b Calculate the power input...

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Name: 12.04.2008 ID: ME 212 Midterm 1 1) Refrigeration cycle using R134-a is shown below. Compressors are working isentropically and the rate of heat removal from the refrigerated space is 5kW. P 1 =0.08 MPa = P 7 ; P 2 =0.3 MPa=P 3 =P 6 ; P 4 =1 MPa=P 5 ; X 1 =1; X 3 =1; X 5 =0; Olduguna gore a) Draw T-s diagram. b) Calculate mass flow rates of the fluids through the compressors. c) Calculate COP of the system. Evaporator Condenser V 3 2 1 4 5 6 7 Compressor 1 Compressor 2

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2) A gas turbine cycle is shown below. Properties of air at different points in the cycle are given below. P 1 =100 kPa, T 1 =27 °C P 2 =500 kPa=P 3 =P 4 =P 5 ; T 3 =300°C, T 4 = 750°C T 5 =800°C P 7 =P 8 =P 9 =P 10 =P 1 =100 kPa; The first turbine drives the compressor and the second turbine produces a power of 1500 kW. Every 0.6 kg of 1 kg air leaving the compressor passes through the turbine 1. Assuming that the compressor and the turbine work isentropically ,the air is ideal, C p and C v are constant;