An engine manufacturer makes the claim that the engine they have developed will, on each cycle, take 100 j of heat out of boiling water at 100°c, do mechanical work of 80 j, and exhaust 20 j of heat at 10°c. what, if anything, is wrong with this claim? the efficiency of this engine is greater than the ideal carnot cycle efficiency.

hot reservoir temp 100

cold res temp= 10

eff = (1- cold/hot)x100%

by temperatures eff = (1-10/100)x100 ... by heat transfers eff = (1-20/100)x100

the claims seem to disagree

eff = 90% very high. 80%

a carnot may be about 70% If it is reversible and is between two reservoirs

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

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