Convert International table BTU per hour per square foot per degree Fahrenheit to Thermochemical kilocalorie per hour per square metre per degree Celsius
Convert International table BTU per hour per square foot per degree Fahrenheit (BTU(IT)/(h·ft²·°F)) to Thermochemical kilocalorie per hour per square metre per degree Celsius (kcal(th)/(h·m²·°C)) instantly and accurately.
Conversion Formula
kcal(th)/(h·m²·°C) = BTU(IT)/(h·ft²·°F) × 4.885695035
About International table BTU per hour per square foot per degree Fahrenheit
The international table BTU per hour per square foot per degree Fahrenheit (BTU(IT)/(h·ft²·°F)) equals 1055.05585262/(3600×0.09290304×5/9) ≈ 5.6783 W/(m²·K). The dominant heat transfer coefficient unit in US engineering: ASHRAE handbooks, ASTM standards, boiler and heat exchanger design, and building envelope U-values are all commonly tabulated in this unit. 1 BTU(IT)/(h·ft²·°F) ≈ 5.6783 W/(m²·K).
About Thermochemical kilocalorie per hour per square metre per degree Celsius
The thermochemical kilocalorie per hour per square metre per degree Celsius (kcal(th)/(h·m²·°C)) equals 4184/3600 ≈ 1.1622 W/(m²·K) (1 kcal(th) = 4184 J; 1 °C = 1 K). Widely used in continental European and Soviet-era building physics, HVAC standards, and heat exchanger design manuals where wall U-values were tabulated in this unit. 1 kcal(th)/(h·m²·°C) ≈ 1.1622 W/(m²·K).
Quick Reference Table
| International table BTU per hour per square foot per degree Fahrenheit (BTU(IT)/(h·ft²·°F)) | Thermochemical kilocalorie per hour per square metre per degree Celsius (kcal(th)/(h·m²·°C)) |
|---|---|
| 1 BTU(IT)/(h·ft²·°F) | 4.8857 kcal(th)/(h·m²·°C) |
| 2 BTU(IT)/(h·ft²·°F) | 9.77139 kcal(th)/(h·m²·°C) |
| 5 BTU(IT)/(h·ft²·°F) | 24.4285 kcal(th)/(h·m²·°C) |
| 10 BTU(IT)/(h·ft²·°F) | 48.857 kcal(th)/(h·m²·°C) |
| 25 BTU(IT)/(h·ft²·°F) | 122.142 kcal(th)/(h·m²·°C) |
| 50 BTU(IT)/(h·ft²·°F) | 244.285 kcal(th)/(h·m²·°C) |
| 100 BTU(IT)/(h·ft²·°F) | 488.57 kcal(th)/(h·m²·°C) |