ass12 - ENGRD 221 ENGINEERING THERMODYNAMICS Problem Set 12...

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ENGRD 221: E NGINEERING T HERMODYNAMICS Problem Set 12 Due: April 24 th 2009, Upson Room 123 (4 Questions) Question 1 (MS 10.31) : The figure below shows a two-stage, ammonia vapor compression refrigeration system with two evaporators and a direct contact heat exchanger. Saturated vapor from evaporator 1 enters compressor 1 at 18 lbf/in. 2 and exits at 70 lbf/in. 2 Evaporator 2 operates at 70 lbf/in. 2 , with saturated vapor exiting at state 8. The condenser pressure is 200 lbf/in. 2 , and saturated liquid refrigerant exits the condenser. Each compressor stage has an isentropic efficiency of 80%. The refrigeration capacity of each evaporator is shown in the figure. Sketch the T-s diagram of the cycle and determine (a) the temperatures, in °F, of the refrigerant in each evaporator. (b) the power input to each compressor stage, in horsepower. (c) the overall coefficient of performance.
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