Convert International table BTU per second per square foot to Thermochemical kilocalorie per hour per square metre
Convert International table BTU per second per square foot (BTU(IT)/(s·ft²)) to Thermochemical kilocalorie per hour per square metre (kcal(th)/(h·m²)) instantly and accurately.
Conversion Formula
kcal(th)/(h·m²) = BTU(IT)/(s·ft²) × 9771.390071
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.
About Thermochemical kilocalorie per hour per square metre
The thermochemical kilocalorie per hour per square metre (kcal(th)/(h·m²)) equals 4184/3600 ≈ 1.1622 W/m² (1 kcal(th) = 4184 J; 1 h = 3600 s). Used in older continental European and Soviet-era building physics standards for wall and roof heat loss calculations. 1 kcal(th)/(h·m²) ≈ 1.1622 W/m².
Quick Reference Table
| International table BTU per second per square foot (BTU(IT)/(s·ft²)) | Thermochemical kilocalorie per hour per square metre (kcal(th)/(h·m²)) |
|---|---|
| 1 BTU(IT)/(s·ft²) | 9771.39 kcal(th)/(h·m²) |
| 2 BTU(IT)/(s·ft²) | 19542.8 kcal(th)/(h·m²) |
| 5 BTU(IT)/(s·ft²) | 48857 kcal(th)/(h·m²) |
| 10 BTU(IT)/(s·ft²) | 97713.9 kcal(th)/(h·m²) |
| 25 BTU(IT)/(s·ft²) | 244285 kcal(th)/(h·m²) |
| 50 BTU(IT)/(s·ft²) | 488570 kcal(th)/(h·m²) |
| 100 BTU(IT)/(s·ft²) | 977139 kcal(th)/(h·m²) |