Print Calculator Periodic Table Question 8 of 17 Map Deb Presented by Physics op

Question

Print Calculator Periodic Table Question 8 of 17 Map Deb Presented by Physics opensti sapling learning Suppose you want to operate an ideal refrigerator with a cold temperature of -18.5 °C, and you would like it to have a coefficient of performance of at least 7.75. What is the maximumhot reservoir temperature for such a refrigerator? Number Previous Next Give Up & View Solution Check Answer xit 8 Hint Temperatures used to calculate the coefficient of performance are expressed on an absolute scale. Make sure to convert the temperature where needed.

Explanation / Answer

here,

the cold temprature , Tc = -18.5 degree C

Tc = 254.5 K

the coefficient of performance , COP = 7.75

the maximum hot reservoir temprature for such a refrigerator be Th

COPr = Tc/(Th - Tc)

7.75 = 254.5/(Th - 254.5)

Th = 287.34 K

Th = 14.34 degree C

the maximum hot reservoir temprature for such a refrigerator is 14.34 degree C

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