In a particular steam engine, the boiler temperature is 128 C and the chilly reservoir temperature is 29 C.?

by jblevine2004

Query by Evan: In a particular steam motor, the boiler temperature is 128 C and the cold reservoir temperature is 29 C.?
Although this engine does three kcal of operate, what minimum volume of heat should be discharged into the cold reservoir?

Finest remedy:

Reply by Ivan A
Assuming it is a carnot motor, the efficiency is given by

performance = 1 – Tc/Th = one – (29+273) / (128+273) = 24 %

As a result, the minimum warmth input is

Qh > 3 / .24 = twelve.five

and, thus,

Qc > 12.five – three = 9.5

Qcmin = nine.5 kcal

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