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Analyzing Thermodynamic CyclesA heat pump maintains a

Fundamentals of Engineering Thermodynamics | 7th Edition | ISBN: 9780470495902 | Authors: Michael J. Moran, Howard N. Shapiro, Daisie D. Boettner, Margaret B. Bailey ISBN: 9780470495902 50

Solution for problem 91P Chapter 2

Fundamentals of Engineering Thermodynamics | 7th Edition

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Fundamentals of Engineering Thermodynamics | 7th Edition | ISBN: 9780470495902 | Authors: Michael J. Moran, Howard N. Shapiro, Daisie D. Boettner, Margaret B. Bailey

Fundamentals of Engineering Thermodynamics | 7th Edition

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Problem 91P

Problem 91P

Analyzing Thermodynamic Cycles

A heat pump maintains a dwelling at 68°F. When operating steadily, the power input to the heat pump is 5 hp, and the heat pump receives energy by heat transfer from 55°F well water at a rate of 500 Btu/min.

(a) Determine the coefficient of performance.

(b) Evaluating electricity at $ 0.10 per kW · h, determine the cost of electricity in a month when the heat pump operates for 300 hours.

Step-by-Step Solution:

a.)

Step 1 of 2

We have to determine the coefficient of performance for the heat pump.

The coefficient of performance is given by the expression

Where,

   = is the energy discharged by heat transfer from the system
              to the hot body    

 = heat energy the pump receives by heat transfer from the well

         = 500 Btu/min

 = net work input  = 5 hp

So,

 

         

Now,                

 

                 

Hence, the coefficient of performance is    

       

                       

Thus, the coefficient of performance is 3.3.



b.)

Step 2 of 2

Chapter 2, Problem 91P is Solved
Textbook: Fundamentals of Engineering Thermodynamics
Edition: 7
Author: Michael J. Moran, Howard N. Shapiro, Daisie D. Boettner, Margaret B. Bailey
ISBN: 9780470495902

This textbook survival guide was created for the textbook: Fundamentals of Engineering Thermodynamics, edition: 7. Fundamentals of Engineering Thermodynamics was written by and is associated to the ISBN: 9780470495902. The full step-by-step solution to problem: 91P from chapter: 2 was answered by , our top Engineering and Tech solution expert on 07/20/17, 09:01AM. This full solution covers the following key subjects: heat, Pump, determine, electricity, min. This expansive textbook survival guide covers 14 chapters, and 1501 solutions. The answer to “Analyzing Thermodynamic CyclesA heat pump maintains a dwelling at 68°F. When operating steadily, the power input to the heat pump is 5 hp, and the heat pump receives energy by heat transfer from 55°F well water at a rate of 500 Btu/min.(a) Determine the coefficient of performance.________________(b) Evaluating electricity at $ 0.10 per kW · h, determine the cost of electricity in a month when the heat pump operates for 300 hours.” is broken down into a number of easy to follow steps, and 72 words. Since the solution to 91P from 2 chapter was answered, more than 782 students have viewed the full step-by-step answer.

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