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Chapter 21: Q. 24 (page 595)
At what cold-reservoir temperature inwould a Carnot engine with a hot-reservoir temperature of have an efficiency of
Cold-reservoir temperature for carnot engine is.
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A Carnot engine whose hot-reservoir temperature is has a thermal efficiency of . By how many degrees should the temperature of the cold reservoir be decreased to raise the engine's efficiency to
At what pressure ratio does a Brayton cycle using a monatomic gas have an efficiency of ?
There has long been an interest in using the vast quantities of thermal energy in the oceans to run heat engines. A heat engine needs a temperature difference, a hot side and a cold side. Conveniently, the ocean surface waters are warmer than the deep ocean waters. Suppose you build a floating power plant in the tropics where the surface water temperature is . This would be the hot reservoir of the engine. For the cold reservoir, water would be pumped up from the ocean bottom where it is always . What is the maximum possible efficiency of such a power plant?
The power output of a car engine running at is . How much (a) work is done and (b) heat is exhausted per cycle if the engine's thermal efficiency is ? Give your answers in.
A refrigerator using helium gas operates on the reversed cycle shown in FIGURE. What are the refrigerator’s () coefficient of performance and () power input if it operates at cycles per second?
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