Convert Thermochemical kilocalorie per hour per square metre per degree Celsius to International table BTU per hour per square foot per degree Fahrenheit
Convert Thermochemical kilocalorie per hour per square metre per degree Celsius (kcal(th)/(h·m²·°C)) to International table BTU per hour per square foot per degree Fahrenheit (BTU(IT)/(h·ft²·°F)) instantly and accurately.
Conversion Formula
BTU(IT)/(h·ft²·°F) = kcal(th)/(h·m²·°C) × 0.204679169
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).
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).
Quick Reference Table
| Thermochemical kilocalorie per hour per square metre per degree Celsius (kcal(th)/(h·m²·°C)) | International table BTU per hour per square foot per degree Fahrenheit (BTU(IT)/(h·ft²·°F)) |
|---|---|
| 1 kcal(th)/(h·m²·°C) | 0.204679 BTU(IT)/(h·ft²·°F) |
| 2 kcal(th)/(h·m²·°C) | 0.409358 BTU(IT)/(h·ft²·°F) |
| 5 kcal(th)/(h·m²·°C) | 1.0234 BTU(IT)/(h·ft²·°F) |
| 10 kcal(th)/(h·m²·°C) | 2.04679 BTU(IT)/(h·ft²·°F) |
| 25 kcal(th)/(h·m²·°C) | 5.11698 BTU(IT)/(h·ft²·°F) |
| 50 kcal(th)/(h·m²·°C) | 10.234 BTU(IT)/(h·ft²·°F) |
| 100 kcal(th)/(h·m²·°C) | 20.4679 BTU(IT)/(h·ft²·°F) |