ClueLuma

Glazing admitted solar heat calculator

Admitted solar heat rate is calculated as SHGC × G × A. Use the stated system boundary and matching input units.

Units
qsolar=SHGC×G×Aq_{\text{solar}} = \mathrm{SHGC} \times G \times A

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

—
Btu/(h·ft²)
ft²
Btu/h

Worked example

Given

  • SHGC\mathrm{SHGC} = 0.4 —
  • GG = 200 Btu/(h·ft²)
  • AA = 300 ft²
qsolar=0.4×200×300=24,000q_{\text{solar}} = 0.4 \times 200 \times 300 = 24{,}000

Symbols and units

SymbolMeaningUnit
qsolarq_{\text{solar}}admitted solar heat rateBtu/h
SHGC\mathrm{SHGC}solar heat gain coefficient—
GGincident solar irradianceBtu/(h·ft²)
AAexposed glazing areaft²

Related calculators

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.