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Midterm1_ME145_S08_solution

# Midterm1_ME145_S08_solution - Department of Mechanical...

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Department of Mechanical Engineering ME 145 – Power Generation Systems - Spring 2008 In-Class Midterm Exam – 20 points total Allowed Materials: Tester et al. text and one 8½ x 11 sheet. PLEASE WRITE ANSWERS & SHOW WORK ON THESE SHEETS. USE BACK IF NECESSARY BUT YOU SHOULDN’T NEED MORE ROOM THAN THAT PROVIDED. ONE OR TWO SENTENCES FOR TEXTUAL ANSWERS. NAME: 1. (2) A certain natural gas fired power plant has a nominal rating of 500 MW(e). Last year (2007), it delivered a net 2.5x10 9 kwhr(e) to the grid. It had a scheduled maintenance outage for the entire month of February and then two unexpected outage of 15 and 10 days, respectively. When the plant was operating, it operated at full power. What was its availability factor and its capacity factor last year? % . . % . 1 57 24 x 365 x 1000 x 500 x10 5 2 x24 365 x Rating Power Produced Energy Factor Capacity 5 85 365 312 24 x 365 x 500 24 x 10) 15 28 (365 x 500 365x24 x Rating Power Available Production Energy ty Availabili 9 = = = = = = = 2. (1) A certain 1 MW(e) wind turbine has a capital cost of \$2M. Estimate the capital cost of an evolutionary design that generates 2 MW(e). M . . \$ M \$ C S S C C R R 17 3 52 2 1 2 2 3 2 3 1 3 2 3 1 = = = α α 3. (3)

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