SpecialProblems22-24

SpecialProblems22-24 - reservoir. The heat engine is...

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Special Problems for ME 200 – Fall 2009 Special Problems 22, 23, and 24 Due Monday, October 26, 2009 SP22: An experimentalist claims that temperature of a small amount of water can be raised to 150 C by transferring heat from high-pressure steam at 120 C, without using either refrigerator or heat pump during the process. (a) Is this a reasonable claim? You must provide thermodynamic justification for your answer. A manufacturer claims to have built an electric resistance heater consuming 5 kWh of electricity while supplying 6 kWh of heat. (b) Is this a reasonable claim? You must provide thermodynamic justification for your answer. SP23: Geothermal steam is considered as an energy source for power generation at a remote site. Steam enters at a pressure of 2 bar with 65% quality and condenses to saturated liquid before exiting the heat engine. Groundwater at 15 C is to be used as the cold
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Unformatted text preview: reservoir. The heat engine is required to generate 3.7 kW. The mass flow rate of steam is 50 kg/hr. (a) What is the rate of heat removal (kJ/hr) from the steam? (b) Calculate the rate of heat rejection (kJ/hr) to the cold reservoir. (c) What is the thermal efficiency (%) of the heat engine? SP24: An internally reversible heat engine operates between 827 C and 17 C. The rate of heat rejection to the reservoir at 17 C is 100 kJ/min. One-half of the work output from the heat engine is used to drive an internally reversible heat pump. The heat pump operates between the reservoir at 17 C and a home maintained at 37 C. (a) Determine the net power delivered (kW) by the heat engine. (b) What is the rate of heat transfer (kJ/min) delivered to the home? (c) Calculate the net rate of heat transfer (kJ/min) for the reservoir at 17 C....
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