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Unformatted text preview: se. 2 2013‐8‐29 Refrigerators 2
How do they work? 3. room temperature gas expands through restrictor, becoming cool and absorbing heat from inside fridge
4. gas is drawn into compressor for another cycle
2. heated gas flows through cooling coils
1. Compressor compresses gas Second Law of Thermodynamics
When work is done by a heat engine running
between Thot and Tcold , only some of the input
heat can be converted to work. The rest is
expelled as heat at Tcold . Maximum Efficiency = Thot − Tcold
Thot Note: Thot and Tcold a...
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- Fall '13