Thermodynamics

Question : 7

Total: 10

A steam engine delivers 5.4×108J of work per minute and services 3.6×109J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?

Solution:

Useful work done per min (output) =5.4×108J
Heat absorbed per min (input) =3.6×109J
Efficiency =

Output

Input

5.4×108

3.6×109

=0.15
=0.15×100%=15%
Heat energy wasted per minute = Heat energy wasted per useful work done per minute
=3.6×109−5.4×108
=3.06×109Jmin−1

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