🏗 Spandrel Panel Thermal Calculator

Calculate heat transmission, cavity temperatures & RCC surface heat load for curtain wall spandrel assemblies

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Panel Dimensions

📊 Vision Glass Zone

Vision Glass Width (mm)

Vision Glass Height (mm)

Spandrel Width (mm)

Spandrel Height (mm)

🌡 Ambient Conditions

Outside Temp (°C)Peak summer exterior

Inside Temp (°C)A/C conditioned space

Solar Irradiance (W/m²)Peak: 800–1000 W/m²

Orientation

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Vision Glass Properties

Glass Type

Solar Factor (g-value / SHGC)ASTM E1084 | Range: 0.2–0.87

U-Value (W/m²K)EN 673 / NFRC 100 | Low-E: 1.0–1.8

ASTM E1300 — Structural glass. EN 410 — Solar & light transmittance. NFRC 100 — U-factor. ISO 10292 — Heat transfer in glazing.

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Spandrel Glass Properties

Spandrel Glass Type

Solar Factor (SHGC)Opacified: 0.03–0.15

U-Value (W/m²K)Spandrel DGU: 1.2–2.0

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Aluminium Backing Sheet

Sheet Thickness

Surface Finish

Al Sheet Conductivity (W/mK)Al 6063-T5: 160–170 W/mK

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Cavity Insulation (Spandrel Back)

Insulation Type

Thickness (mm)

Density (kg/m³)

Thermal Conductivity λ (W/mK)Auto-set from density; override if needed

Air Gap in Cavity (mm)Between spandrel glass & Al sheet

Standards: IS 8183 (Glass wool slabs India) · IS 11239 (Rock wool) · ASTM C612 (Mineral fiber insulation) · EN 13162 (Mineral wool products) · ASTM C518 (Thermal conductivity) · BS 5422 (Use of thermal insulation)

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Spandrel Assembly Cross-Section (Live Preview)

↑ Cross-section viewed from side. Outer face left → Inner face right. Layers drawn to relative scale.