Quick Answer
Calculate Triple Glazing Solar Heat Gain Coefficient (SHGC) Calculator
Calculator
Result Interpretation
Triple Glazing Solar Heat Gain Coefficient (SHGC) Calculator computes Solar Heat Gain Coefficient (SHGC) in dimensionless using the defined engineering formula and the input values provided.
Worked Example
Verified calculation
Given:
- Outer surface reflectance (outdoor side) = 0.07
- Glass spectral transmittance (solar-weighted) = 0.82
- Inner surface reflectance of pane 1 (indoor side) = 0.08
- Inner surface reflectance of pane 2 = 0.08
- Inner surface reflectance of pane 3 = 0.08
Expected Result:
- Solar Heat Gain Coefficient (SHGC) = 0.63854704552611
Engineering Interpretation:
Under the given input conditions, the calculated result is: Solar Heat Gain Coefficient (SHGC) = 0.63854704552611 dimensionless.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.
Formula / Method
SHGC = (solar-weighted * (1 - indoor side) * (1 - inner surface reflectance of pane 2) * (1 - inner surface reflectance of pane 3)) / (1 - indoor side * inner surface reflectance of pane 2 * inner surface reflectance of pane 3 * outdoor side)Formula family: formula_buildingphysics_triple_glazing_solar_heat_gain_calculator
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| tau_g | Glass spectral transmittance (solar-weighted) | INPUT | Glass spectral transmittance (solar-weighted) |
| rho_i1 | Inner surface reflectance of pane 1 (indoor side) | INPUT | Inner surface reflectance of pane 1 (indoor side) |
| rho_i2 | Inner surface reflectance of pane 2 | INPUT | Inner surface reflectance of pane 2 |
| rho_i3 | Inner surface reflectance of pane 3 | INPUT | Inner surface reflectance of pane 3 |
| rho_o | Outer surface reflectance (outdoor side) | INPUT | Outer surface reflectance (outdoor side) |
| Solar Heat Gain Coefficient (SHGC) | Solar Heat Gain Coefficient (SHGC) | OUTPUT | Solar Heat Gain Coefficient (SHGC) |
Calculation Steps
- Enter the glass spectral transmittance (solar-weighted) in dimensionless.
- Enter the inner surface reflectance of pane 1 (indoor side) in dimensionless.
- Enter the inner surface reflectance of pane 2 in dimensionless.
- Enter the inner surface reflectance of pane 3 in dimensionless.
- Enter the outer surface reflectance (outdoor side) in dimensionless.
- Step 1: Compute solar heat gain coefficient (shgc).
- Read the solar heat gain coefficient (shgc) (dimensionless) from the results.
Engineering Summary
Calculate Triple Glazing Solar Heat Gain Coefficient (SHGC) Calculator
Frequently Asked Questions
What does this calculator calculate?
The Triple Glazing Solar Heat Gain Coefficient (SHGC) Calculator estimates Solar Heat Gain Coefficient (SHGC) based on the input parameters you provide
Why is glass spectral transmittance (solar-weighted) important in this calculation?
glass spectral transmittance (solar-weighted) is directly proportional to solar heat gain coefficient (shgc). When you enter glass spectral transmittance (solar-weighted) in dimensionless, the calculator uses it in the engineering formula to compute the output
How should I interpret the result solar heat gain coefficient (shgc)?
The calculator outputs solar heat gain coefficient (shgc) in dimensionless. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Glass spectral transmittance (solar-weighted) (dimensionless), Inner surface reflectance of pane 1 (indoor side) (dimensionless), Inner surface reflectance of pane 2 (dimensionless), Inner surface reflectance of pane 3 (dimensionless), Outer surface reflectance (outdoor side) (dimensionless). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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