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How to Convert from Btu (th)/hour/square foot to Watt/square meter [W/m^2]
Learn how to convert heat flux density values from Btu (th)/hour/square foot to the SI unit watt per square meter [W/m^2]. This converter is useful for building science, HVAC applications, and energy assessments.
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Btu (th)/hour/square foot to Watt/square meter [W/m^2] Conversion Table
| Btu (th)/hour/square foot | Watt/square meter [W/m^2] |
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Custom Unit Conversion Table Generator – Instant Printable Conversion Tables
Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.
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Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.
| Btu (th)/hour/square foot | Watt/square meter [W/m^2] |
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What Is This Tool?
This converter transforms heat flux density measurements from the imperial unit Btu (th)/hour/square foot to the metric watt per square meter [W/m^2]. It is designed for users working in building science, HVAC, energy code compliance, and related fields to easily perform standardized conversions.
How to Use This Tool?
- Enter the heat flux density value in Btu (th)/hour/square foot
- Select the conversion to watt/square meter [W/m^2]
- View the converted result instantly for your calculations
Key Features
- Converts heat flux density units from Btu (th)/hour/square foot to watt/square meter [W/m^2]
- Browser-based and user-friendly interface for quick conversions
- Supports applications in building science, HVAC load calculations, and energy assessments
Examples
- Convert 5 Btu (th)/hour/square foot: 5 × 3.1524810541 = 15.7624 W/m²
- Convert 2 Btu (th)/hour/square foot: 2 × 3.1524810541 = 6.30496 W/m²
Common Use Cases
- Expressing U-factors or insulation heat loss/gain in buildings
- Sizing HVAC loads by calculating heat transfer through building components
- Reporting heat flux measurements for energy-code compliance
- Specifying solar irradiance in photovoltaic assessments
- Describing heat flux in industrial and furnace heat-transfer applications
Tips & Best Practices
- Ensure consistent definitions of Btu (th) for accurate conversion
- Use the conversion within typical building or industrial heat flux ranges
- Apply the conversion for standardized energy and engineering calculations
Limitations
- Variations in Btu (th) definitions and rounding can affect precision
- Conversion is most reliable when applied under stable measurement conditions
- Accuracy depends on the consistency of the thermochemical Btu definition
Frequently Asked Questions
- What does Btu (th)/hour/square foot measure?
- It measures the rate of heat transfer per unit area, indicating how much thermochemical British thermal unit of heat is transferred per hour through one square foot.
- Why convert Btu (th)/hour/square foot to watt/square meter?
- Converting to watt/square meter standardizes measurements in SI units for building science, HVAC design, and energy assessments.
- Where is this conversion commonly used?
- It's frequently used in building envelope heat calculations, HVAC load sizing, energy code compliance, photovoltaic evaluations, and industrial heat transfer.
Key Terminology
- Btu (th)/hour/square foot
- A unit measuring thermochemical British thermal units of heat transferred per hour through one square foot of area, representing heat flux density.
- Watt/square meter [W/m^2]
- The SI unit for heat flux density quantifying the power of heat transfer per unit area.