Convert Celsius Heat Unit per hour per square foot to International table BTU per hour per square foot
Convert Celsius Heat Unit per hour per square foot (CHU/(h·ft²)) to International table BTU per hour per square foot (BTU(IT)/(h·ft²)) instantly and accurately.
Conversion Formula
BTU(IT)/(h·ft²) = CHU/(h·ft²) × 1.8
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 International table BTU per hour per square foot
The international table BTU per hour per square foot (BTU(IT)/(h·ft²)) equals 1055.05585262/(3600×0.09290304) ≈ 3.15459 W/m². The standard US heat flux unit in ASHRAE, ASTM, and building codes for thermal resistance (R-value), boiler ratings, and heat exchanger design. 1 BTU(IT)/(h·ft²) ≈ 3.15459 W/m².
Quick Reference Table
| Celsius Heat Unit per hour per square foot (CHU/(h·ft²)) | International table BTU per hour per square foot (BTU(IT)/(h·ft²)) |
|---|---|
| 1 CHU/(h·ft²) | 1.8 BTU(IT)/(h·ft²) |
| 2 CHU/(h·ft²) | 3.6 BTU(IT)/(h·ft²) |
| 5 CHU/(h·ft²) | 9 BTU(IT)/(h·ft²) |
| 10 CHU/(h·ft²) | 18 BTU(IT)/(h·ft²) |
| 25 CHU/(h·ft²) | 45 BTU(IT)/(h·ft²) |
| 50 CHU/(h·ft²) | 90 BTU(IT)/(h·ft²) |
| 100 CHU/(h·ft²) | 180 BTU(IT)/(h·ft²) |