Part 6: Cooling Load Rules of Thumb
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300–400 Sq.Ft./Ton; 30–40 Btuh/Sq.Ft.; 25–28 Btuh/Sq.Ft.; 0.75–0.93 1.0–3.0 CFM/Sq.Ft. 0.5–1.5 CFM/Sq.Ft. 1.0–1.5 CFM/Sq.Ft. 4–10 AC/Hr.
6.01 Offices, Commercial
Total Heat Total Heat Room Sens. Heat SHR Perimeter Spaces Interior Spaces Building Block CFM Air Change Rate
A. General:
1. 2. 3. 4. 5. 6. 7. 8.
225–275 Sq.Ft./Ton 43–53 Btuh/Sq.Ft.
B. Large, Perimeter:
1. Total Heat 2. Total Heat
325–375 Sq.Ft./Ton 32–37 Btuh/Sq.Ft.
300–350 Sq.Ft./Ton 34–40 Btuh/Sq.Ft.
C. Large, Interior:
1. Total Heat 2. Total Heat D. Small:
1. Total Heat 2. Total Heat
(Range 230–520) (Range 23–52) (Range 19–37)
C. Room Sens. Heat
B. Total Heat
A. Total Heat
4–10 AC/Hr.
0.75–0.90
28–38 Btuh/Sq.Ft.
48–60 Btuh/Sq.Ft.
200–250 Sq.Ft./Ton
(Range 35–75)
(Range 160–340)
6.02 Banks, Court Houses, Municipal Buildings, Town Halls
D. SHR
(Range 21–48)
E. Air Change Rate
250–350 Sq.Ft./Ton
(Range 20–40)
(Range 30–60)
(Range 200–400)
6.03 Police Stations, Fire Stations, Post Offices A. Total Heat
25–35 Btuh/Sq.Ft.
34–48 Btuh/Sq.Ft.
0.75–0.90
B. Total Heat
D. SHR
4–10 AC/Hr.
C. Room Sens. Heat
E. Air Change Rate
PA RT 6
70