Question

A rigid tank contains air at 1.5 bar and 600C. The pressure of air is raised

to 2.5 bar by transfer if heat from a constant temperature reservoir at

4000C. The temperature of the surroundings is 270C. Determine per kg of

air, the loss of available energy due to heat transfer.

Answer 1

final pressure will be 

p=vt 

=$0.1\times 15$

=$1.5 Mn/m^2$

final temperature will be 

t=p/v

=$0.11/0.1$

$=1.1\degree celcius$

heat transfer will be

$=15\times0.11\times0.1$

=0.165 answer