A room having dimension 12 m × 10 m × 3.5 m is required to be mechanically ventilated by air-conditioner. The temperature difference between outdoor ambient air and the supply air
Q. A room having dimension 12 m × 10 m × 3.5 m is required to be mechanically ventilated by air-conditioner. The temperature difference between outdoor ambient air and the supply air is 12 °C. Consider three air exchanges per hour. The volumetric specific heat of the air is 1250 J/m3 °C. Assume one ton of refrigeration (TR) is equal to 3.5 kW. The capacity of the air-conditioner for the room in TR will be _____________.
A. 2.5
B. 1.5
C. 0.5
D. 3.5
Ans: 1.5
Solution:
Rate of ventilation = (12 × 10 × 3.5 × 3)/3600=0.35
Cooling load = 1250 × 0.35 × 12 = 5.25 kw = 1.5 TR