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The coefficient of performance K = H/P is a dimensionless

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 8E Chapter 20

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 8E

The coefficient of performance K = H/P is a dimensionless quantity. Its value is independent of the units used for H and P, as long as the same units, such as watts, are used for both quantities. However, it is common practice to express H in Btu/h and P in watts. When these mixed units are used, the ratio H/P is called the ?energy efficiency ratio? (EER). If a room air conditioner has K = 3.0, what is its EER?

Step-by-Step Solution:

Solution 8E Step 1 of 4: The refrigerator or air conditioner operation can be consider as the reverse operating heat engine. As heat engine takes heat from the hot body and transfers the heat into colder object. Whereas a refrigerator does the reverse process; that is, it takes heat from the cooler place(inside refrigerator) and gives it off to a warmer place(outside the refrigerator). That is, a heat engine will do a net output mechanical work whereas the refrigerator or air conditioner requires a net input mechanical work. Step 2 of 4: The coefficient of performance of refrigerator or air conditioner which is dimensionless as both H and P are expressed in watts is given by, Q c Ht H(watts) K= |W |= Pt = P(watts)…….1 Where H is the heat current and P is power output. Similarly if the heat current is expressed in Btu/h and Power in watts, the ratio is know as energy efficiency ratio(EER), that is H(Btu/h) EER = P(watts)………..2 Where H is the heat current and P is power output.

Step 3 of 4

Chapter 20, Problem 8E is Solved
Step 4 of 4

Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

The answer to “The coefficient of performance K = H/P is a dimensionless quantity. Its value is independent of the units used for H and P, as long as the same units, such as watts, are used for both quantities. However, it is common practice to express H in Btu/h and P in watts. When these mixed units are used, the ratio H/P is called the ?energy efficiency ratio? (EER). If a room air conditioner has K = 3.0, what is its EER?” is broken down into a number of easy to follow steps, and 80 words. University Physics was written by and is associated to the ISBN: 9780321675460. The full step-by-step solution to problem: 8E from chapter: 20 was answered by , our top Physics solution expert on 05/06/17, 06:07PM. This full solution covers the following key subjects: Units, used, Watts, ratio, eer. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. This textbook survival guide was created for the textbook: University Physics, edition: 13. Since the solution to 8E from 20 chapter was answered, more than 927 students have viewed the full step-by-step answer.

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