SPSolution22-24

SPSolution22-24 - Naik, Sameer V. Fall 2009 1000 Solution...

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Unformatted text preview: Naik, Sameer V. Fall 2009 1000 Solution for Special Problem 22 (a) The experimentalist claims that heat transfer occurs from low temperature (120 C) to high temperature (150 C) without any work input using either refrigeration or heat pump cycle. This violates the Clausius statement of the second law of thermodynamics. Therefore, this claim is not valid. (b) The manufacturer claims that 1 kWh energy is produced in the electric resistance heater. This violates the first law of thermodynamics (energy can neither be created nor be destroyed). Therefore, this claim is not valid. Note that the second law of thermodynamics is not violated. Naik, Sameer V. Fall 2009 1000 Solution for Special Problem 23 Given:- Heat engine operating on geothermal steam Find:- Rate of heat removal (kJ/hr) from the steam - Rate of heat rejection (kJ/hr) to the cold reservoir - Thermal efficiency (%) of the heat engine System: Heat Engine Geothermal Steam Reservoir P 1 = 2 bar x 1 = 65% P 2 = 2 bar sat. liquidsat....
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SPSolution22-24 - Naik, Sameer V. Fall 2009 1000 Solution...

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