Question

A refrigerator with a coefficient of performance of 1.80 absorbs 3.15×104 J of heat from the low-temperature reservoir during each cycle.

How much mechanical work is required to operate the refrigerator for a cycle?

How much heat does the refrigerator discard to the high-temperature reservoir during each cycle?

Answer 1

Solutiowo Given! Coefficient of peeformance, k = 1.80 1 Absorbs heat from the cold reservoir Qc = 3.15*10ts ① let wo be the mechanical work ů required to operate the refrigerator for a cycle. Then have the formula KaQc De we =) W = QC 3.15 x 104 J 1.80 A W = 1,75x100 I 113 Therefore, 1:750107g merchanical work is required, let, heat dis card to the high temperature reservoir is = QH THot reservoir Hence, we can w write BH = 8 + Cold Reservoir QH Pau

>> Q4 = (3.15 x 10t + x 104 + 1.75X106) J = |QH = 4.9x10ts ... Heat discard to hot reservoir during each cycle iů 4.9x107]
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