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.
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 |