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CHE2202 Homework #7 (due 3/28/2016 at 11 AM) Total: 100 points . Comment: Most points for HW problems will be for correct methodology, precision, and correctness of expression. Some problems require judicious choice of assumptions. Making reasonable assumptions is an important part of problem solving. State all assumptions you make clearly. If numbers are asked for in the problem, obtaining them is less important than describing how they would be found. 1. (50 points) Sandler 5.2 It is desired to improve the thermal efficiency of the Rankine power generation cycle. Two possibilities have been suggested. One is to increase the evaporator temperature, and the second is to decrease the condenser temperature (and consequently the pressure) of the low pressure part of the cycle. (a) Draw a T-S diagram for the Rankine cycle similar to that in Figure 5.2-2d, but with a
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Unformatted text preview: higher evaporator temperature. Show from a comparison of those two diagrams that the efficiency of the Rankine power generation cycle increases with increasing evaporator temperature. (b) Repeat part (a) for a lower condenser temperature. 2. (50 Points) Sandler 5.1 (a) An automobile air conditioner uses the vapor-compression refrigeration cycle with HFC-134a as the refrigerant. The operational temperature of the evaporator is 7 o C and that of the condenser is 45 o C. Determine the coefficient of performance of this air conditioning system and the amount of work needed for each kilojoule of cooling provided by the air conditioner. (b) For service in high temperature areas, the condenser temperature may go up to 65 o C. How would the answer to part (a) change in this case?...
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• Winter '08
• Dr.Guzinski
• Chemistry, Heating, ventilating, and air conditioning, Rankine power generation

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