What does watt per square meter measure?

It measures heat flux density, representing the rate of heat transfer per unit area in SI units.

Why convert to Btu (th)/hour/square foot?

Because this imperial unit is commonly used in building science and HVAC industries in certain countries.

Is this conversion exact for all conditions?

No, it assumes steady-state conditions and standard unit definitions, so actual conditions may affect precision.

Convert Watt/square meter [W/m^2] to Btu (th)/hour/square foot

Use this unit converter to easily transform heat flux density values from watt per square meter to Btu (th) per hour per square foot. This tool is helpful for building science, HVAC, and solar energy applications.

Watt/square meter [W/m^2]

Btu (th)/hour/square foot

Please check your input. It must be a valid numeric value.

Watt/square meter [W/m^2] to Btu (th)/hour/square foot Conversion Table

Watt/square meter [W/m^2]	Btu (th)/hour/square foot

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Watt/square meter [W/m^2] to Btu (th)/hour/square foot Conversion Table
Watt/square meter [W/m^2]	Btu (th)/hour/square foot

Explore More Heat Flux Density Units Converter

What Is This Tool?

This converter changes heat flux density measurements from watt per square meter, the SI unit for rate of heat transfer per unit area, into Btu (th) per hour per square foot, an imperial unit often used in building and HVAC contexts.

How to Use This Tool?

Enter the heat flux density value in watt per square meter
Select watt/square meter as the source unit and Btu (th)/hour/square foot as the target unit
Execute the conversion to view the equivalent value in Btu (th)/hour/square foot

Key Features

Allows conversion between watt/square meter and Btu (th)/hour/square foot units
Suitable for a variety of heat flux density applications including building design and solar energy assessment
Browser-based and easy to use with clear input and output format

Examples

10 watt/square meter equals 3.1721 Btu (th)/hour/square foot
50 watt/square meter equals 15.8605 Btu (th)/hour/square foot

Common Use Cases

Specifying solar irradiance for evaluating photovoltaic panel output
Assessing heat loss or gain through building walls, windows, or roofs using U-values
Sizing HVAC systems by calculating heat transfer rates through building envelopes

Tips & Best Practices

Ensure you input values in the correct unit to get accurate conversions
Use the tool in contexts consistent with standard heat flux density measurements
Apply conversions to facilitate communication between metric and imperial system users in building and HVAC projects

Limitations

Conversion assumes steady-state heat transfer conditions and standard Btu definitions
Results may vary with local measurement standards or conditions
Imperial units like Btu (th)/hour/square foot are predominantly used in certain geographic regions

Frequently Asked Questions

What does watt per square meter measure?: It measures heat flux density, representing the rate of heat transfer per unit area in SI units.
Why convert to Btu (th)/hour/square foot?: Because this imperial unit is commonly used in building science and HVAC industries in certain countries.
Is this conversion exact for all conditions?: No, it assumes steady-state conditions and standard unit definitions, so actual conditions may affect precision.

Key Terminology

Watt/square meter [W/m²]: The SI unit measuring heat flux density as power per unit area, indicating heat transfer rate per square meter.
Btu (th)/hour/square foot: An imperial unit measuring heat flux density, representing thermochemical British thermal units transferred per hour per square foot.
Heat Flux Density: The rate of heat energy transfer through a surface per unit area.

Quick Knowledge Check

What does watt per square meter quantify?

Volume of heat transferred

Heat flux density

Time duration of heat transfer

In which fields is converting W/m² to Btu (th)/h·ft² commonly used?

Building science and HVAC

Agriculture and food processing

Automotive engineering

What is a limitation of this conversion?

It changes based on air humidity

It assumes steady-state conditions

It works only for liquids

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