Question

A refrigeration cycle rejects Qn 500 Btu/s to a hot reservoir at 540 R, while receiving c200 Btu/s at 240°R. This refrigeration cycle a)- is internally reversible b)- is irreversible c)- is impossible d)- cannot be determined

Answer 1

(b) Irreversible cycle.

Step-by-step explanation:

Given;

`T_2=540R ,Q_2= 500 Btu/s ,T_1=240 R ,Q_1= 200 Btu/s`

To find the validity of cycle

`\oint _R(dQ)/(T)\leq0`

If it is zero then cycle will be reversible cycle and if it is less than zero then cycle will be irreversible cycle.These are possible cycle.

If it is greater than zero ,then cycle will be impossible .

Now find

`(Q_1)/(T_1)-(Q_2)/(T_2)=(200)/(240)-(500)/(540)`

`(Q_1)/(T_1)-(Q_2)/(T_2)`= -0.09

It means that this cycle is a irreversible cycle.