7one lb of refrigerant 134a contained within a piston–cylinder assembly undergoes a process from a state where the temperature is 60f and the refrigerant is saturated liquid to a state where the pressure is 140 lbf/in 2 and quality is 50%. determine the change in specific entropy of the refrigerant, in btu/lbr. can this process be accomplished adiabatically?

Explanation:

A) In order to solve the table it is necessary to consult tables A11-E and A10E for refrigerant R134-a

In this way we obtain that:

In this way,

In this way the entropy change is,

B) Whenever entropy yields a positive result, the process can be carried out adiabatically.

the diagram which shows forces as either balanced = same speed or unbalanced = accelerarting