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Archived Coefficient of performance for a refrigerator

  • Thread starter rmjmu507
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1. Homework Statement

The COP for heat pumps and refrigerators achieved in the industry is almost 50% of the Carnot limit. Make estimates for the following case:

For refrigerator to achieve -10°C in the freezer area with an external temperature of 25°C

2. Homework Equations

COP for refrigerator = T(low) / [T(high)-T(low)]

3. The Attempt at a Solution

Using this equation, I find that the COP is 7.5, but this seems high. Where have I made a mistake?
 

CWatters

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You calculated the Carnot COP but the problem statement says..

The COP for heat pumps and refrigerators achieved in the industry is almost 50% of the Carnot limit
 

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