PAUL HAY Capital Projects
Topic: Sizing Air-Conditioning Units
Author: Paul Hay
e-mail: paul.hay@phcjam.com
profile: www.linkedin.com/in/phcjam
SAMPLE PROBLEM
Assuming negligible infiltration, calculate the size air-conditioning system required for an office building constructed as follows:
Location: Kingston, Jamaica Orientation = North
Dimensions: 18 m x 18 m x 7.2 m high Stories = 2
OTTVr = 18.2 W/m2 Occupancy = 10 m2/person
OTTVw = 113.8 W/m2 Lighting = 15 W/m2
Misc. Power = 25 W/m2
SOLUTION
(A) For internal heat-gain,
Total floor area = 2 (18 x 18) = 648 m2
No. occupants = 648/10 = 65 persons (approx)
Heat from occupants = 100 x No. occupants [1.1]
= 100 x 65 = 6,500 W
Heat from lighting = 15 x 648 = 9,720 W
Heat from power = 25 x 648 = 16,200 W
Internal heat-gain = 32,420 W
(B) For external heat-gain,
Roof area = 18 x 18
= 324 m2
Heat-gain from roof = 18.2 x 324 = 5,896.8 W
Total wall area = 4 (18 x 7.2) = 518.4 m2
Heat from walls = 113.8 x 518.4 = 58,993.92 W
External heat-gain = 64,890.72 W
(C) For A/C size,
Total heat-gain = 32,420 + 64,890.72 = 97,310.72 W
A/C size = Total heat-gain [1.2]
3,516.85 W/Tr
= 97,310.72 = 27.67 = 30 T (approx.)
3,516.85
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