Question

The reservoir at 900 k is brought in contact with ambient at 300 k, during this 9000 kj of heat lost by reservoir, find total loss in availability

Answer 1

Answer:

A heat reservoir at 900 K is brought into contact with the ambient at 300 K for a short time. During this period 9000 kJ of heat is lost by the heat reservoir. The total loss in availability due to this process is:

a)18000 kJ

b)9000 kJ

c)6000 kJ

d)None of the above

Correct answer is option 'D'

Answer 2

Answer:

6000 kJ

Explanation:

Change in entropy of hot reservoir = - Q/T

- 9000/900 = - 10

Change in entropy of ambient air =Q/T

=9000/300 = +30

Loss in availability = T°( Sh + Sc)

= 300(-10+30)

= 6000 kJ