christophercordero15
25.03.2020 •
Physics
The engine that powers a crane burns fuel at a temperature of 1500 oC. It is cooled by air at a temperature of 20 oC. The crane is used to lift a 1000 kg steel girder 30 m into the air. If the engine is 40 % as efficient as a Carnot engine, what is it's thermal efficiency in %?
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Ответ:
Explanation:
Given that,
Warm temperature TH = 1500°C
K= °C +273
TH=1500+273=1773K
Cold temperature TL = 20°C
TL = 20+273
TL = 293K
The efficiency of a Carnot engine is given as
η = 1 — (TL/TH)
η = 1 — (293/1773)
η = 1 — 0.165
η = 0.8347
Then, in %
η = 0.8347×100
η = 83.47%
Thermal efficiency is 83.47%
Ответ: