Lect2 -- Energy Transformation

Therestis expelledasheatat tcold maximum efficiency

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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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