A newly proposed device for generating electricity from the sun is a heat engine in which the hot reservoir is created by focusing sunlight on a small spot on one side of the engine. The cold reservoir is ambient air at 20°C. The designer claims that the efficiency will be 60%. What minimum hot-reservoirtemperature, in °C, would be required to produce this efficiency?

Q: An ideal heat pump is being considered for use in heating an environment with a temperature of…

A: Given:  temperature of hot reservoir, TH = 22 degree C = 295 K  Coefficient of performance, COP = 12…

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A: Tcold = 28 Degree Celsius  = 28 + 273  = 301 K Thot = 439 degree celsius  = 439 + 273  = 712 K

Q: what is the ideal efficiency of an engine that runs at 3500 K when the surrounding air is 250 K?

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A: Thot = 27 o C = 27 + 273  = 300 K Tcold = 5 o C = 5 + 273  = 278 K Using formula for efficiency : η…

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Q: A heat engine does 4.6 × 107 J of work when supplied 8.9 × 107 J. What is its efficiency?

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Q: In a very mild winter climate, a heat pump has heat transfer from an environment at 5.00ºC to one at…

A: Given: Tc = 5 degree C = 278 K  Th = 35 degree C = 308 K

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