All Problems

Second law of thermodynamics, entropy

Problem 2.115

A heat engine employing a Carnot cycle with an efficiency of η=10%\eta=10 \% is used as a refrigerating machine, the thermal reservoirs being the same. Find its refrigerating efficiency ε\varepsilon.

Reveal Answer
ε=(1η)/η=9\varepsilon=(1-\eta) / \eta=9