Convert International table BTU per hour per square foot per degree Fahrenheit to Watt per square metre kelvin

Convert International table BTU per hour per square foot per degree Fahrenheit (BTU(IT)/(h·ft²·°F)) to Watt per square metre kelvin (W/(m²·K)) instantly and accurately.

International table BTU per hour per square foot per degree Fahrenheit (BTU(IT)/(h·ft²·°F))
Watt per square metre kelvin (W/(m²·K))

Conversion Formula

W/(m²·K) = BTU(IT)/(h·ft²·°F) × 5.678263341

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 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).

Quick Reference Table

International table BTU per hour per square foot per degree Fahrenheit (BTU(IT)/(h·ft²·°F))Watt per square metre kelvin (W/(m²·K))
1 BTU(IT)/(h·ft²·°F)5.67826 W/(m²·K)
2 BTU(IT)/(h·ft²·°F)11.3565 W/(m²·K)
5 BTU(IT)/(h·ft²·°F)28.3913 W/(m²·K)
10 BTU(IT)/(h·ft²·°F)56.7826 W/(m²·K)
25 BTU(IT)/(h·ft²·°F)141.957 W/(m²·K)
50 BTU(IT)/(h·ft²·°F)283.913 W/(m²·K)
100 BTU(IT)/(h·ft²·°F)567.826 W/(m²·K)

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