Solar Heat Gain Calculator
Calculate the solar heat gain through a window based on SHGC, area, and solar irradiance.
How to Use the Solar Heat Gain Calculator
- Enter the SHGC of the window (0–1).
- Enter the window area in m².
- Enter the solar irradiance in W/m².
- Click Calculate for instantaneous and daily heat gain.
使用场景
- •Passive solar heating design.
- •Cooling load estimation.
- •Window specification comparison.
- •Energy-efficient building design.
公式
Q = SHGC × A × I (watts). Daily gain = Q × 6 / 1000 kWh (assuming 6 peak sun hours).
常见问题
What is SHGC?
Solar Heat Gain Coefficient (SHGC) is the fraction of solar radiation admitted through a window. Range: 0.1–0.9.
What is a good SHGC?
For hot climates, SHGC < 0.25 is preferred. For cold climates, higher SHGC (0.4–0.6) can help with passive heating.
What is peak solar irradiance?
Typical peak irradiance is 800–1000 W/m². The default 500 W/m² is a moderate average value.