Thermal Performance (CW) Calculator

Your Inputs

Values entered

= Glass U-value COG (W/m²·K) = 1.1, Frame U-value (W/m²·K) = 3.4, Panel width (mm) = 1,500, Panel height (mm) = 3,600, Frame sightline (mm) = 65, Outside design temp (°C) = -18, Inside temp (°C) = 21, Total CW area (m²) = 500

= 8 inputs provided

Overall U-factor (W/m²·K)

Calculated from your inputs

= Based on Glass U-value COG (W/m²·K) (1.1), Frame U-value (W/m²·K) (3.4), Panel width (mm) (1,500), Panel height (mm) (3,600), Frame sightline (mm) (65), Outside design temp (°C) (-18), Inside temp (°C) (21), and Total CW area (m²) (500)

= 1.43

Area-weighted U-factor including frame, edge-of-glass, and centre-of-glass zones.

Condensation resistance (CRF)

Calculated from your inputs

= Based on Glass U-value COG (W/m²·K) (1.1), Frame U-value (W/m²·K) (3.4), Panel width (mm) (1,500), Panel height (mm) (3,600), Frame sightline (mm) (65), Outside design temp (°C) (-18), Inside temp (°C) (21), and Total CW area (m²) (500)

= 82.8

Condensation Resistance Factor per AAMA 1503. Higher is better; ≥50 recommended.

Overall R-value (m²·K/W)

Calculated from your inputs

= Based on Glass U-value COG (W/m²·K) (1.1), Frame U-value (W/m²·K) (3.4), Panel width (mm) (1,500), Panel height (mm) (3,600), Frame sightline (mm) (65), Outside design temp (°C) (-18), Inside temp (°C) (21), and Total CW area (m²) (500)

= 0.7

Thermal resistance (1/U).

Centre-of-glass area (%)

Calculated from your inputs

= Based on Glass U-value COG (W/m²·K) (1.1), Frame U-value (W/m²·K) (3.4), Panel width (mm) (1,500), Panel height (mm) (3,600), Frame sightline (mm) (65), Outside design temp (°C) (-18), Inside temp (°C) (21), and Total CW area (m²) (500)

= 77

Percentage of panel area that is centre-of-glass zone.

Edge-of-glass area (%)

Calculated from your inputs

= Based on Glass U-value COG (W/m²·K) (1.1), Frame U-value (W/m²·K) (3.4), Panel width (mm) (1,500), Panel height (mm) (3,600), Frame sightline (mm) (65), Outside design temp (°C) (-18), Inside temp (°C) (21), and Total CW area (m²) (500)

= 11.1

Percentage of panel area that is edge-of-glass zone (63.5 mm band per NFRC).

Frame area (%)

Calculated from your inputs

= Based on Glass U-value COG (W/m²·K) (1.1), Frame U-value (W/m²·K) (3.4), Panel width (mm) (1,500), Panel height (mm) (3,600), Frame sightline (mm) (65), Outside design temp (°C) (-18), Inside temp (°C) (21), and Total CW area (m²) (500)

= 12

Percentage of panel area occupied by frame.

Inside surface temp (°C)

Calculated from your inputs

= Based on Glass U-value COG (W/m²·K) (1.1), Frame U-value (W/m²·K) (3.4), Panel width (mm) (1,500), Panel height (mm) (3,600), Frame sightline (mm) (65), Outside design temp (°C) (-18), Inside temp (°C) (21), and Total CW area (m²) (500)

= 14.3

Predicted inside glass surface temperature at winter design conditions.

Annual heat loss (kWh)

Calculated from your inputs

= Based on Glass U-value COG (W/m²·K) (1.1), Frame U-value (W/m²·K) (3.4), Panel width (mm) (1,500), Panel height (mm) (3,600), Frame sightline (mm) (65), Outside design temp (°C) (-18), Inside temp (°C) (21), and Total CW area (m²) (500)

= 60,086

Estimated annual conductive heat loss through the curtain wall (assumes 3,500 HDD climate).