Convert International table BTU per second per square foot per degree Fahrenheit to Watt per square metre kelvin
Convert International table BTU per second per square foot per degree Fahrenheit (BTU(IT)/(s·ft²·°F)) to Watt per square metre kelvin (W/(m²·K)) instantly and accurately.
Conversion Formula
W/(m²·K) = BTU(IT)/(s·ft²·°F) × 20441.74803
About International table BTU per second per square foot per degree Fahrenheit
The international table BTU per second per square foot per degree Fahrenheit (BTU(IT)/(s·ft²·°F)) equals ≈ 20442 W/(m²·K) (= 3600 × BTU(IT)/(h·ft²·°F)). Encountered in atmospheric re-entry aerodynamic heating analysis, solid rocket motor nozzle throat design, and nuclear reactor thermal-hydraulics with peak surface heat transfer rates. 1 BTU(IT)/(s·ft²·°F) ≈ 20442 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 second per square foot per degree Fahrenheit (BTU(IT)/(s·ft²·°F)) | Watt per square metre kelvin (W/(m²·K)) |
|---|---|
| 1 BTU(IT)/(s·ft²·°F) | 20441.7 W/(m²·K) |
| 2 BTU(IT)/(s·ft²·°F) | 40883.5 W/(m²·K) |
| 5 BTU(IT)/(s·ft²·°F) | 102209 W/(m²·K) |
| 10 BTU(IT)/(s·ft²·°F) | 204417 W/(m²·K) |
| 25 BTU(IT)/(s·ft²·°F) | 511044 W/(m²·K) |
| 50 BTU(IT)/(s·ft²·°F) | 1022090 W/(m²·K) |
| 100 BTU(IT)/(s·ft²·°F) | 2044170 W/(m²·K) |