×
Log in to StudySoup
Get Full Access to Engineering and Tech - Textbook Survival Guide
Join StudySoup for FREE
Get Full Access to Engineering and Tech - Textbook Survival Guide

A small house that is kept at 20°C inside loses 12 kW to

Fundamentals of Thermodynamcs | 8th Edition | ISBN: 9781118131992 | Authors: Claus Borgnakke, Richard E. Sonntag ISBN: 9781118131992 58

Solution for problem 85HP Chapter 5

Fundamentals of Thermodynamcs | 8th Edition

  • Textbook Solutions
  • 2901 Step-by-step solutions solved by professors and subject experts
  • Get 24/7 help from StudySoup virtual teaching assistants
Fundamentals of Thermodynamcs | 8th Edition | ISBN: 9781118131992 | Authors: Claus Borgnakke, Richard E. Sonntag

Fundamentals of Thermodynamcs | 8th Edition

4 5 0 398 Reviews
16
3
Problem 85HP

A small house that is kept at 20°C inside loses 12 kW to the outside ambient at 0°C. A heat pump is used to help heat the house together with possible electric heat. The heat pump is driven by a 2.5-kW motor, and it has a COP that is one-fourth that of a Carnot heat pump unit. Find the actual COP for the heat pump and the amount of electric heat that must be used (if any) to maintain the house temperature.

Step-by-Step Solution:

Solution 85 HP

Step 1 of 7</p>

We are required to coefficient of performance of heat pump and the amount of electric heat.

Step 2 of 7</p>

Temperature at which the house to be maintained, K

Temperature of the outside ambient,K  

Power input of heat pump is,  kW

Step 3 of 7</p>

The coefficient of performance of actual pump is given by

         

         

         

Step 4 of 7</p>

The coefficient of performance of  is given by

 

       

Now,

     

      kW

Step 5 of 7

Chapter 5, Problem 85HP is Solved
Step 6 of 7

Textbook: Fundamentals of Thermodynamcs
Edition: 8
Author: Claus Borgnakke, Richard E. Sonntag
ISBN: 9781118131992

Unlock Textbook Solution

Enter your email below to unlock your verified solution to:

A small house that is kept at 20°C inside loses 12 kW to

×
Log in to StudySoup
Get Full Access to Engineering and Tech - Textbook Survival Guide
Join StudySoup for FREE
Get Full Access to Engineering and Tech - Textbook Survival Guide
×
Reset your password