Heat Flux Converter
Convert heat flux and heat transfer rate per unit area.
How to Use the Heat Flux Converter
Enter a heat flux value, select the source unit and choose the target unit. Heat flux describes the rate of heat transfer through a surface area and is commonly used in thermal engineering, insulation studies and heat exchanger analysis.
Practical Example
A heat flux of 2 kW/m² equals 2,000 W/m². Using the approximate imperial relationship, 1 W/m² is about 0.3171 Btu/h·ft², so 2,000 W/m² is about 634.2 Btu/h·ft².
Factors That Affect Heat Flux
Actual heat flux depends on temperature difference, material conductivity, surface area, convection conditions, radiation and insulation. This converter changes units only and does not calculate those physical effects.
Frequently Asked Questions
What is the SI unit of heat flux?
The SI unit is watts per square meter (W/m²).
Is heat flux the same as heat transfer rate?
No. Heat flux is heat transfer rate per unit area.
Can heat flux be negative?
Yes. The sign can indicate heat-flow direction depending on the chosen convention.
Unit Relationship and Practical Context
Heat flux is heat-transfer rate per unit area. Converting W/m² to other heat-flux units preserves the same rate density, but total heat transfer additionally requires the area and may vary across a nonuniform surface.