12 A closed system undergoes a process in heat transfer occu

(12) A closed system undergoes a process in heat transfer occurs at the system boundary. For each case below, determine whether the entropy of the system increases, decreases, remains unchanged or is indeterminate (please do not guess...thank you)

1.) Interny reallversible process with heat transfer from the system to the surroundings?

2.) Internally reversible process with heat transfer to the system from the surroundings?

3.) Internally reversible and adiabatic process?

4.) Internal irreversibilities present with heat transfer from the system to the surroundings?

5.) Internal irreversibilities present with heat transfer to the system from the surroundings?

6.) Internally irreversibilities present with no heat transfer with the surroundings?

Solution

Irreversibilities always increases entropy

So 4,5,6 Entropy increases

3) Entropy remains same

2) Entropy increases as heat intake i.e. +ve

1) Entropy decreases as heat flows out i.e. -ve