Convert Watt per square metre to Celsius Heat Unit per hour per square foot
Convert Watt per square metre (W/m²) to Celsius Heat Unit per hour per square foot (CHU/(h·ft²)) instantly and accurately.
Conversion Formula
CHU/(h·ft²) = W/m² × 0.1761101837
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.
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).
Quick Reference Table
| Watt per square metre (W/m²) | Celsius Heat Unit per hour per square foot (CHU/(h·ft²)) |
|---|---|
| 1 W/m² | 0.17611 CHU/(h·ft²) |
| 2 W/m² | 0.35222 CHU/(h·ft²) |
| 5 W/m² | 0.880551 CHU/(h·ft²) |
| 10 W/m² | 1.7611 CHU/(h·ft²) |
| 25 W/m² | 4.40275 CHU/(h·ft²) |
| 50 W/m² | 8.80551 CHU/(h·ft²) |
| 100 W/m² | 17.611 CHU/(h·ft²) |