A heat resevoir is at 50 C Find the change in entropy of the

A heat resevoir is at 50 C. Find the change in entropy of the heat resevoir when:

1. 1 kJ of heat is added

2. 1 kJ of heat is removed

3. Heat is added at a rate of 100 W for a total of 1 hour.

Solution

1) dS = dQ/T = 1/323 =0.0030959 kJ/K

2) dS=dQ/T = -1/323 = -0.0030959kJ/K

3) dQ= 100*3600=360000 J = 360kJ

dS=360/323=1.11455 kJ/K