301 Sample_Test_3

301 Sample_Test_3 - SAMPLE MAE 301: Engineering...

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SAMPLE 1 MAE 301: Engineering Thermodynamics I Spring 2010 Test 3 (15% of final grade) April 22, 2009 Problem 1. (25 points) (a) The COP of a reversible heat pump operating between two thermal reservoirs is equal to 4. What is the efficiency of a reversible heat engine operating between the same temperature reservoirs? (b) Select a correct relation for an irreversible heat engine cycle operating between two temperature reservoirs: 0 > L L H H T Q T Q ; 0 = L L H H T Q T Q ; 0 < L L H H T Q T Q Problem 2. (25 points) A heat pump cycle is used to maintain the interior of a building at 20 ˚C. At steady state, the heat pump receives energy by heat transfer from well water at 10 ˚C and discharge energy by heat transfer to the building at a rate of 120,000 kJ/h. Over a period of 14 days, an electric meter records that 1490 kWh of electricity is provided to the heat pump. Determine (a) the amount of energy that the heat pump receives over the 14-day period from the well water
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This note was uploaded on 05/19/2010 for the course MAE 301 taught by Professor Hassan during the Spring '08 term at N.C. State.

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301 Sample_Test_3 - SAMPLE MAE 301: Engineering...

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