Chapter 4: 4.11 (page 129)
What is the maximum possible COP for a cyclic refrigerator operating between a high-temperature reservoir at 1K and a low-temperature reservoir at 0.01 K ?
COP=0.01
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Prove directly (by calculating the heat taken in and the heat expelled) that a Carnot engine using an ideal gas as the working substance has an efficiency of
Why must you put an air conditioner in the window of a building, rather than in the middle of a room?
Estimate the maximum possible COP of a household air conditioner. Use any reasonable values for the reservoir temperatures.
Imagine that your dog has eaten the portion of Table 4.1 that gives entropy data; only the enthalpy data remains. Explain how you could reconstruct the missing portion of the table. Use your method to explicitly check a few of the entries for consistency. How much of Table 4.2 could you reconstruct if it were missing? Explain.
Derive equation for the efficiency of the Otto cycle.
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