Please Solve Problem 3 With Explanation 1 (57.89 KiB) Viewed 33 times
Problem 3) Thermal and Electrical Load Analysis This problem is a continuation of Problem 2. As stated above, a cogeneration system needs to provide electricity and 30 psia saturated steam. A Caterpillar gen-set (see specifications below) is one possible cogeneration system design. a) Determine the steam flow rate (lbm/hr) and the thermal supply ( kW cquiv) that is possible at this condition. Assume the water enters the HRSG at 105∘F, the Cp,exh=0.25Btu/lbm−R, the pinch point temperature difference must be greater than 40∘F, and the exit gas temperature must be greater than 320∘F. b) Locate your operating point on another version of the above plot (which includes the two dashed lines for the base loads). Discuss your design for satisfying the base load requirements with this system. c) Discuss your design for satisfying the loads above the base loads. d) Describe the advantages and disadvantages of this system.
Problem 2) Thermal and Electrical Load Analysis A facility has the following monthly average electrical and thermal requirements. a) Complete the H/P column. b) Plot the electrical power (kW) and the thermal energy (kWcquiv ) as functions of the month of the year. This is two plots. On each plot, show the base load with a horizontal, dashed line. c) Complete the following plot which will illustrate various cogeneration designs. First, show the base loads (power and thermal) on the plot with vertical and horizontal dashed lines. Second, show the cogeneration characteristic lines for H/P ratios of 0.3,0.5 and 0.8. Third, identify five (5) operating points that satisfy at least one of the load conditions. d) Describe how each of the five (5) operating points would be able to satisfy both power and thermal loads. In other words, what additional equipment or considerations must be used to satisfy all loads. e) For the cogeneration system with a characteristic H/P of 0.5, discuss the issue of non-base load operation. In other words, discuss how you would meet the loads during the full year.
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