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Unformatted text preview: e more expensive but more efficient air‐conditioner B is clearly the better buy in this case since air conditioners last at least 15 years. But the decision would not be so easy if the unit cost of electricity at that location was much less than $0.10/kWh, or if the annual air‐conditioning load of the house was much less than 120,000 kWh. 3. Yes. The second Carnot principle states that all reversible heat engine cycles operating between the same temperature limits have the same thermal efficiency. 4. No. At best (when everything is reversible), the increase in the work produced w...
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This note was uploaded on 01/17/2014 for the course MECH ENG 2w04 taught by Professor Cotton during the Winter '13 term at McMaster University.
- Winter '13