To determine Check whether the experiments are reasonable or not. Explanation Write the formula to calculate coefficient of performance of reversible refrigerator ( COP R,rev ) . COP R,rev = 1 ( T H T L − 1 ) (I) Here, absolute temperature of high and low temperature reservoir is T H and T L respectively. Write the formula to calculate consumption of work by the actual refrigerator during the experiment ( W net,in ) . W net,in = W ˙ net,in Δ t (II) Here, required power input to refrigerator is W ˙ net,in and length of time to remove heat from a cool medium to warmer medium is Δ t . Write the formula to calculate coefficient of a refrigerator ( COP R ) . COP R = Q L W net,in (III) Here, amount of heat rejected by the refrigerator is Q L . Conclusion: Convert the unit of temperature T L from ° C to K . T L = − 30 ° C = ( − 30 + 273 ) K = 243 K Convert the unit of temperature T H from ° C to K . T H = 25 ° C = ( 25 + 273 ) K = 298 K Substitute 298 K for T H and 243 K for T L in Equation (I)

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ISBN: 9781307434316

Author: CENGEL

Publisher: INTER MCG

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Basic Thermodynamic Processes

The word 'thermodynamics' can be divided into two words, 'thermo' and 'dynamics'. The word thermo deals with the heat and thermal phenomenon, whereas dynamics deals with forces or external agent that drives the heat flow or aids in the motion of heat.

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Chapter 6.11, Problem 90P

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Chapter 6.11, Problem 89P

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