Convert Celsius Heat Unit per hour per square foot to Watt per square metre

Convert Celsius Heat Unit per hour per square foot (CHU/(h·ft²)) to Watt per square metre (W/m²) instantly and accurately.

Celsius Heat Unit per hour per square foot (CHU/(h·ft²))
Watt per square metre (W/m²)

Conversion Formula

W/m² = CHU/(h·ft²) × 5.678263341

About Celsius Heat Unit per hour per square foot

The Celsius heat unit per hour per square foot (CHU/(h·ft²)) equals (9/5)×1055.05585262/(3600×0.09290304) ≈ 5.6783 W/m². The CHU (= 9/5 BTU(IT)) uses a 1 °C temperature interval instead of 1 °F; historically used in UK and Canadian heating engineering. 1 CHU/(h·ft²) ≈ 5.6783 W/m² = (9/5) × BTU(IT)/(h·ft²).

About Watt per square metre

The watt per square metre (W/m²) is the SI coherent unit for heat flux density and irradiance. Solar irradiance at Earth's surface ≈ 1000 W/m²; solar constant ≈ 1361 W/m²; human skin radiative emission ≈ 100 W/m²; global average geothermal flux ≈ 0.087 W/m². Referenced in ISO 80000-4. 1 W/m² = 1 J/(s·m²) = 10⁻³ kW/m².

Quick Reference Table

Celsius Heat Unit per hour per square foot (CHU/(h·ft²))Watt per square metre (W/m²)
1 CHU/(h·ft²)5.67826 W/m²
2 CHU/(h·ft²)11.3565 W/m²
5 CHU/(h·ft²)28.3913 W/m²
10 CHU/(h·ft²)56.7826 W/m²
25 CHU/(h·ft²)141.957 W/m²
50 CHU/(h·ft²)283.913 W/m²
100 CHU/(h·ft²)567.826 W/m²

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