Convert International table BTU per hour per square foot to International table BTU per second per square foot
Convert International table BTU per hour per square foot (BTU(IT)/(h·ft²)) to International table BTU per second per square foot (BTU(IT)/(s·ft²)) instantly and accurately.
Conversion Formula
BTU(IT)/(s·ft²) = BTU(IT)/(h·ft²) × 0.0002777777778
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.
About International table BTU per second per square foot
The international table BTU per second per square foot (BTU(IT)/(s·ft²)) equals 1055.05585262/0.09290304 ≈ 11357 W/m² (= 3600 × BTU(IT)/(h·ft²)). Used for extreme heat flux: atmospheric re-entry aerodynamic heating, solid rocket nozzle throat, and nuclear reactor thermal hydraulics design. 1 BTU(IT)/(s·ft²) ≈ 11357 W/m².
Quick Reference Table
| International table BTU per hour per square foot (BTU(IT)/(h·ft²)) | International table BTU per second per square foot (BTU(IT)/(s·ft²)) |
|---|---|
| 1 BTU(IT)/(h·ft²) | 0.000277778 BTU(IT)/(s·ft²) |
| 2 BTU(IT)/(h·ft²) | 0.000555556 BTU(IT)/(s·ft²) |
| 5 BTU(IT)/(h·ft²) | 0.00138889 BTU(IT)/(s·ft²) |
| 10 BTU(IT)/(h·ft²) | 0.00277778 BTU(IT)/(s·ft²) |
| 25 BTU(IT)/(h·ft²) | 0.00694444 BTU(IT)/(s·ft²) |
| 50 BTU(IT)/(h·ft²) | 0.0138889 BTU(IT)/(s·ft²) |
| 100 BTU(IT)/(h·ft²) | 0.0277778 BTU(IT)/(s·ft²) |