# ass11 - o C Saturated vapor enters the condenser at 36 o C...

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ENGRD 221: E NGINEERING T HERMODYNAMICS Problem Set 11 Due: April 17 th 2009, Upson Room 123 (4 Questions) Problem 1 (9.30) – An air-standard Diesel cycle has a maximum temperature of 1800K. At the beginning of compression, p 1 =95kPa and T 1 =300K. The mass of air is 12g. For compression ratios ranging from 15 to 25 plot a) The net work of the cycle, in kJ b) The thermal efficiency c) The mean effective pressure, in kPa Problem 2 (9.37) – An air-standard dual cycle has a compression ratio of 16 and a cutoff ratio of 1.15. At the beginning of compression, p 1 =95kPa and T 1 =300K. The pressure increases by a factor of 2.2 during the constant volume heat addition process. If the mass of air is 0.04kg, determine a) The heat addition at constant volume and at constant pressure, each in kJ. b) The net work of the cycle, in kJ c) The heat rejection, in kJ d) The thermal efficiency. Problem 3 (10.2) – Refrigerant 22 is the working fluid in a Carnot vapor refrigeration cycle for which the evaporator temperature is -30

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Unformatted text preview: o C. Saturated vapor enters the condenser at 36 o C, and saturated liquid exists at the same temperature. The mass flow rate of refrigerant is 10kg/min. Determine a) The rate of heat transfer to the refrigerant passing through the evaporator, in kW. b) The net power input to the cycle, in kW c) The coefficient of performance. d) The refrigeration capacity, in tons. Problem 4 (10.18) A vapor-compression refrigeration system, using ammonia as the working fluid, has evaporator and condenser pressures of 200 and 30 lbf/in 2 , respectively. The refrigerant passes through each heat exchanger with a negligible pressure drop. At the inlet and exit of the compressor, the temperatures are 10 o F and 300 o F, respectively. The heat transfer rate from the working fluid passing through the condenser is 50,000 Btu/h, and liquid exits at 200 lbf/in 2 , 90 o F. If the compressor operates adiabatically, determine a) The compressor power input, in hp. b) The coefficient of performance....
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