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

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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;
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Unformatted text preview: a) Draw T-s diagram. b) Calculate the power input of the compressor. c) Calculate effectiveness of the regenerator. d) Calculate efficiency of the cycle. Turbine 1 Compressor Regenerator V 1 2 3 4 5 6 7 8 10 9 Combustion Chamber 1 Combustion Chamber 2 Turbine 2 3) A gas mixture contains 5 kg N 2 , 3.5 kg O 2 , 1.7 kg H 2 , 0.4 kg CO 2 . a. Find mass and volume ratios of each gas in the mixture, calculate gas constant of mixture and the molar mass. b. If pressure of the mixture is 800 kPa, find the partial pressures of the each gas. 4) Air-water vapor mixture at 25°C and 100 kPa has %50 relative humidity. Find a. Specific Humidity. b. Dew point temperature. If the temperature and the relative humidity of the mixture is changed to 20°C and % 40 with the same pressure, determine the amount of the added or extracted water per kg dry air....
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me212mid1 - a) Draw T-s diagram. b) Calculate the power...

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