Convert Watt per square metre kelvin to International table BTU per hour per square foot per degree Fahrenheit
Convert Watt per square metre kelvin (W/(m²·K)) 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) = W/(m²·K) × 0.1761101837
About Watt per square metre kelvin
The watt per square metre kelvin (W/(m²·K)) is the SI coherent unit for heat transfer coefficient (ISO 80000-5). Typical values: free convection in still air 2-25 W/(m²·K), forced-air cooling 25-250 W/(m²·K), natural water convection 200-1000 W/(m²·K), forced water up to 10 000 W/(m²·K), nucleate boiling up to 100 000 W/(m²·K). 1 W/(m²·K) = 1 J/(s·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
| Watt per square metre kelvin (W/(m²·K)) | International table BTU per hour per square foot per degree Fahrenheit (BTU(IT)/(h·ft²·°F)) |
|---|---|
| 1 W/(m²·K) | 0.17611 BTU(IT)/(h·ft²·°F) |
| 2 W/(m²·K) | 0.35222 BTU(IT)/(h·ft²·°F) |
| 5 W/(m²·K) | 0.880551 BTU(IT)/(h·ft²·°F) |
| 10 W/(m²·K) | 1.7611 BTU(IT)/(h·ft²·°F) |
| 25 W/(m²·K) | 4.40275 BTU(IT)/(h·ft²·°F) |
| 50 W/(m²·K) | 8.80551 BTU(IT)/(h·ft²·°F) |
| 100 W/(m²·K) | 17.611 BTU(IT)/(h·ft²·°F) |