Let us calculate the AC tonnage for a room as shown below.
Given data:
Length of the room = 16ft.
Width of the room = 14ft.
Height of the room = 10ft.
No. of windows = 1no.
No. of doors = 1no.
Calculation:
1. Approximate method:
The volume of the room
= [length x breadth x height]
= [16ft. x 14ft. x 10ft.]
= 2240 cu.ft.
AC tonnage required for a room
= [volume of the room ➗ 1000]
= [2240cuft. ➗ 1000]
= 2.24 tonnes.
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👀. What are the factors to be considered while deciding the AC tonnage for a room?
2. Accurate (nearer to) method:
The volume of the room = 2240 cu.ft.
BTU multiplying factor per cu.ft = 6
a.) BTU for the room volume
=[ 2240 x 6]
=13440 BTU
b.) No. of doors = 1no.
No. of windows = 1no.
BTU factor for doors & windows = 1000/no.
Total BTU for doors & windows of the room
= [2nos. x 1000]
= 2000 BTU
c.) Suppose, the no. of persons coming to the room = 5 nos.
BTU factor per person =500
BTU for the total person
= [500 x 5]
= 2500 BTU
Total BTU of the room
= BTU for [volume + openings + person]
= [13440 + 2000 + 2500]
= 17940 BTU
12000 BTU needs 👉 AC of 1 tonnage.
Therefore,
AC tonnage required for the room
= [total BTU ➗ 12000]
= [17940 ➗ 12000]
= 1.495 tons.
Note:
1. Add 10% extra, if the building is in a sunny region or area.
2. Add 10% extra, if the roof is exposed to direct sunlight.
If we are installing the AC for the room in a sunny area exposed to direct sunlight, then
AC tonnage required
= [1.495 tons + 20% of 1.495 tons]
= [1.495 + 0.2 x 1.495]
= 1.794 tons, say 1.8 tons.
Note:
Always round off the AC tonnage nearer to the available options in the market.
To go through the articles on Estimation & calculation in civil engineering, click here.
Thank you for going through these calculation steps❤. Have a good day 😄.
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