SpecialProblems21-22 - True False Explain SP22 A...

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Special Problems for ME 200 – Fall 2011 Special Problems 21 and 22 Due Friday, October 21, 2011 SP21: (a) A homeowner claims that his 5-year-old electric resistance heaters used for space heating have conversion efficiency of 100%. Explain whether any thermodynamic laws are violated. (b) Is thermal efficiency of all work-producing devices, including hydroelectric power plants, limited by the Kelvin-Planck statement of the second law? Explain. (c) A process that violates the first law of thermodynamics also violates the second law of thermodynamics.
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Unformatted text preview: True? False? Explain. SP22: A groundwater-coupled heat pump is driven by a steam turbine to supply heat to an industrial process occurring at 120 C. Steam enters the turbine at 320 C and 10 bar and exits as saturated vapor at 1 bar. The turbine supplies 33.6 kW to the heat pump which receives heat from groundwater at 20 C. The COP of the heat pump is 3. (a) Calculate the mass flow rate (kg/s) of steam passing through the turbine. (b) What is the rate of heat transfer (kW) from the groundwater supply to the heat pump?...
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This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue.

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