Solar Heat Gain of 4 ft by 6 ft Window

(Sq. Ft.) (Solar Heat Gain Factor) (Cooling Load Factor) = Btu/hr

  SHGF CLF Btu/hr CFM
East at 9:00am 216 .80 4147 137
East at 4:00pm 38 .14 128 4.2
West at 9:00am 38 .11 100 3.3
West at 4:00pm 216 .81 4199 139

Cooling Load: S.W. Master Bedroom Suite

Cloudy Day @ 85°F Ambient
Total Clg Load = 1300 btu/hr
CFM requirements = 43 cfm
Percent of design cfm* = 22%
Percent of total (3 ton) cfm = 3.6%

Sunny Late Afternoon @ 85°F Ambient
Total Clg Load = 9,498 btu/hr
CFM requirements = 300 cfm
Percent of design* = 150%
Percent of total (3-ton) cfm = 25%

Cooling Load Calculation: Procedure Selection

(Adequate Exposure Diversity - A calculation of the total glass load to see if any hourly total exceeds the 12 hr average by more than 20 or 30%)

Summer Peaking Applications Room Load Zone Load Equipment Load
Any Single Zone System with AED Average N/A Average
Any Multi Zone System with AED Peak Peak Average
Any Single Zone System with No AED Peak N/A Sum of Rooms
Any Multi Zone System with No AED Peak Peak Sum of Rooms

Manual J 8th Edition Fig 1-5, pg-1-7

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