Answer:
The capacity of refrigeration =5.35kw
Explanation:
Total people in classroom =26
One person dissipates =360kj/h
So 26 person will dissipates =360 × 26
=2.6kw
15 light bulb with 40w each
Total heat dissipates 15×40 =600
=0.6kw
Fan will dissipate =200w
=0.2kw
Room gain air at a rate of =200kg/h
Warm air enthalpy =10kj/kg
Total heat coming with warm air = 200×10
0.555kw
Heat coming from window walls =5000kj/h
=5000/3600= 1.388kw
Total heat coming in the room =2.6+0.6+0.2+0.55+1.388
=5.35kw
To maintain room at steady temperature
Heat should be removed at constant rate
Energy balance =energy in/energy out
Capacity of refrigeration =5.35kw
