ClueLuma

Solar gain over one selected period calculator

Use irradiation on the selected glazing plane and only the days included in the period.

Units
Qperiod=A×τ×Idaily×DQ_{\text{period}} = A \times \tau \times I_{\text{daily}} \times D

Calculator

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

ft²
fraction
Btu/(ft²·day)
day
Btu

Worked example

Given

  • AA = 130 ft²
  • τ\tau = 0.72 fraction
  • IdailyI_{\text{daily}} = 950 Btu/(ft²·day)
  • DD = 31 day
Qperiod=130×0.72×950×31=2,756,520Q_{\text{period}} = 130 \times 0.72 \times 950 \times 31 = 2{,}756{,}520

Symbols and units

SymbolMeaningUnit
QperiodQ_{\text{period}}transmitted period heatBtu
AAglazing areaft²
τ\tautransmission fractionfraction
IdailyI_{\text{daily}}daily irradiationBtu/(ft²·day)
DDdaysday

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