Convert Thermochemical kilocalorie per hour per square metre to International table BTU per second per square foot
Convert Thermochemical kilocalorie per hour per square metre (kcal(th)/(h·m²)) to International table BTU per second per square foot (BTU(IT)/(s·ft²)) instantly and accurately.
Conversion Formula
BTU(IT)/(s·ft²) = kcal(th)/(h·m²) × 0.0001023395845
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.
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
| Thermochemical kilocalorie per hour per square metre (kcal(th)/(h·m²)) | International table BTU per second per square foot (BTU(IT)/(s·ft²)) |
|---|---|
| 1 kcal(th)/(h·m²) | 0.00010234 BTU(IT)/(s·ft²) |
| 2 kcal(th)/(h·m²) | 0.000204679 BTU(IT)/(s·ft²) |
| 5 kcal(th)/(h·m²) | 0.000511698 BTU(IT)/(s·ft²) |
| 10 kcal(th)/(h·m²) | 0.0010234 BTU(IT)/(s·ft²) |
| 25 kcal(th)/(h·m²) | 0.00255849 BTU(IT)/(s·ft²) |
| 50 kcal(th)/(h·m²) | 0.00511698 BTU(IT)/(s·ft²) |
| 100 kcal(th)/(h·m²) | 0.010234 BTU(IT)/(s·ft²) |