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To convert a measurement from Watts per square meter-Kelvin to BTU per hour-square foot-degree Fahrenheit, you use the conversion factor that 1 W/(m²·K) is approximately equal to 0.1761 BTU/(hr·ft²·°F).
Example:
A typical heat transfer coefficient for air is 10 W/(m²·K). Convert this to Imperial units.
10 W/(m²·K) × 0.1761 [BTU/(hr·ft²·°F)] / [W/(m²·K)] ≈ 1.761 BTU/(hr·ft²·°F)
Answer: 10 W/(m²·K) is equal to approximately 1.761 BTU/(hr·ft²·°F).
The heat transfer coefficient quantifies the rate of heat transfer between a solid surface and a moving fluid (a process called convection). It's a complex value that depends on fluid properties, flow velocity, and geometry.
It is essential for designing and analyzing heat exchangers, cooling systems (like radiators), and any process involving heat transfer to or from a fluid.