Thermal Performance (CW) Calculator

Overall U-factor from frame, glass, and spacer.

Glass U-value COG (W/m²·K)

Frame U-value (W/m²·K)

Panel width (mm)

Panel height (mm)

Frame sightline (mm)

Outside design temp (°C)

Inside temp (°C)

Total CW area (m²)

Tab to move between fields

Overall U-factor (W/m²·K)

1.43

Condensation resistance (CRF)

82.8

Overall R-value (m²·K/W)0.7

Centre-of-glass area (%)77

Edge-of-glass area (%)11.1

Frame area (%)12

Inside surface temp (°C)14.3

Annual heat loss (kWh)60,086

How to Use This Calculator

Enter the centre-of-glass U-value and frame U-value in W/m2K.
Set panel width, height, and frame sightline dimension in millimeters.
Input outside and inside design temperatures for condensation analysis.
Enter total curtain wall area for annual heat loss estimation.
Review the overall U-factor, condensation resistance (CRF), and annual heat loss for energy code compliance.

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