Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
15
The Laws of Thermodynamics
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15-1 and 15-2: First Law of Thermodynamics
15-3: Human Metabolism
15-5: Heat Engines
15-6: Refrigerators, Air Conditioners, Heat Pumps
15-7: Entropy
15-10: Statistical Interpretation
15-11: Energy Resources

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 22
Q

A heat engine’s high temperature THT_H could be ambient temperature, because liquid nitrogen at 77 K could be TLT_L and is cheap. What would be the efficiency of a Carnot engine that made use of heat transferred from air at room temperature (293 K) to the liquid nitrogen “fuel” (Fig.15–25)?

Problem 22.
Figure 15-25.
A
74%74\%
Giancoli 7th Edition, Chapter 15, Problem 22 solution video poster
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VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. The ideal efficiency the best efficiency in other words that you can get with a heat engine with liquid nitrogen as the low temperature reservoir and ambient room temperature as the high temperature reservoir is one minus the low temperature divided by the high temperature. So it's one minus seventy seven Kelvin divided by two hundred and ninety three Kelvin which is seventy four percent.

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