What does Btu (th)/second/square foot measure?

It measures the rate of heat transfer per unit area using thermochemical British thermal units per second across one square foot.

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

Conversion to Btu (IT)/hour/square foot aligns heat flux density with common building energy codes and performance metrics expressed on an hourly basis.

Can this converter handle transient thermal behaviors?

No, the conversion assumes steady-state conditions and may not accurately reflect transient or time-varying heat transfer.

How to Convert from Btu (th)/second/square foot to Btu (IT)/hour/square foot

Learn how to convert heat flux density values from Btu (thermochemical) per second per square foot to Btu (International Table) per hour per square foot using our online converter. Ideal for HVAC and building envelope professionals.

Btu (th)/second/square foot

Btu (IT)/hour/square foot

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

Btu (th)/second/square foot to Btu (IT)/hour/square foot Conversion Table

Btu (th)/second/square foot	Btu (IT)/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.

Btu (th)/second/square foot to Btu (IT)/hour/square foot Conversion Table
Btu (th)/second/square foot	Btu (IT)/hour/square foot

Explore More Heat Flux Density Units Converter

What Is This Tool?

This converter translates heat flux density measurements from Btu (th)/second/square foot, a unit expressing energy transfer rate per area in thermochemical British thermal units, into Btu (IT)/hour/square foot, which uses International Table Btu measurements over time. It's designed for energy and thermal calculations relevant to engineering and building science.

How to Use This Tool?

Enter the heat flux density value in Btu (th)/second/square foot.
Select the conversion direction to Btu (IT)/hour/square foot.
Click convert to get the corresponding value based on the fixed conversion rate.

Key Features

Converts heat flux density between two specific Imperial units: Btu (th)/second/square foot and Btu (IT)/hour/square foot.
Supports applications in HVAC, building envelope design, and fire-exposure testing.
Provides an easy-to-use browser-based interface for quick calculations.

Examples

1 Btu (th)/second/square foot equals 3597.5924333596 Btu (IT)/hour/square foot.
0.5 Btu (th)/second/square foot equals 1798.79621668 Btu (IT)/hour/square foot.

Common Use Cases

Specifying heat transfer rates through building components like walls, windows, or insulation in energy calculations.
Calculating radiative or convective heat loads on equipment and thermal system surfaces.
Assessing surface heat flux in fire testing and flammability evaluations.
Expressing thermal transmittance (U-values) according to building energy codes.
Sizing heating and cooling loads for HVAC systems using per-hour heat flux values.

Tips & Best Practices

Confirm whether the heat flux density uses thermochemical or International Table BTU units before converting.
Use this conversion for steady-state thermal conditions to ensure accuracy in building performance metrics.
Apply the conversion when aligning data with energy codes requiring hourly heat flux expressions.

Limitations

Thermochemical and International Table BTU units differ slightly, which may affect conversion precision.
Conversion assumes steady-state conditions; transient effects are not accounted for.
Time unit differences can introduce minor discrepancies if not carefully considered.

Frequently Asked Questions

What does Btu (th)/second/square foot measure?: It measures the rate of heat transfer per unit area using thermochemical British thermal units per second across one square foot.
Why convert to Btu (IT)/hour/square foot?: Conversion to Btu (IT)/hour/square foot aligns heat flux density with common building energy codes and performance metrics expressed on an hourly basis.
Can this converter handle transient thermal behaviors?: No, the conversion assumes steady-state conditions and may not accurately reflect transient or time-varying heat transfer.

Key Terminology

Btu (th)/second/square foot: A unit representing heat flux density as thermochemical British thermal units transferred per second across one square foot.
Btu (IT)/hour/square foot: A heat flux density unit based on International Table British thermal units transferred per hour per square foot, often used for expressing thermal transmittance.
Heat Flux Density: The rate of heat energy transferred per unit area over time.
Thermochemical BTU (Btu (th)): A measure of energy based on thermochemical definitions of British thermal units.
International Table BTU (Btu (IT)): The British thermal unit defined by the International Table standard, used for energy calculations.

Quick Knowledge Check

What does Btu (th)/second/square foot represent?

Heat transfer per hour across a unit area

Heat transfer per second across a unit area

Thermal resistance of materials

Why is Btu (IT)/hour/square foot useful in building science?

It is used to measure heat flux instantly

It aligns with hourly thermal transmittance values required by energy codes

It measures electrical power per area

What limitation should you consider when converting between these units?

Differences in measurement area

Differences between thermochemical and International Table BTU definitions

Differences in temperature scale

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