What does Btu (IT)/hour/square foot measure?

It measures the rate of heat transfer per unit area, specifically one British thermal unit transferred per hour over a square foot surface.

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

Converting allows comparison between slower heat flux rates common in building analysis and rapid, intense heat fluxes found in fire and high-temperature testing.

Are Btu (IT) units compatible with SI units?

Btu (IT) units are non-SI and based on the International Table standard, which may limit direct interoperability with SI thermal measurements.

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

Learn how to convert heat flux density measurements from Btu (IT) per hour per square foot to Btu (IT) per second per square foot using our straightforward unit converter with examples and practical applications.

Btu (IT)/hour/square foot

Btu (IT)/second/square foot

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

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

Explore More Heat Flux Density Units Converter

What Is This Tool?

This tool converts heat flux density values between the units Btu (IT)/hour/square foot and Btu (IT)/second/square foot, enabling users to translate thermal transmittance rates measured over an hour to those measured per second for various technical and scientific applications.

How to Use This Tool?

Enter the heat flux density value in Btu (IT)/hour/square foot
Select the target unit Btu (IT)/second/square foot from the dropdown
Click convert to obtain the equivalent value in the desired unit
Review example calculations for clarity and confirmation

Key Features

Converts heat flux density units involving British thermal units and surface area
Supports conversion between hourly and per-second heat transfer rates
Includes examples for easy understanding of the conversion process
Useful for building energy code compliance and fire testing scenarios

Examples

Convert 10 Btu (IT)/hour/square foot: 10 × 0.0002777778 = 0.002777778 Btu (IT)/second/square foot
Convert 100 Btu (IT)/hour/square foot: 100 × 0.0002777778 = 0.02777778 Btu (IT)/second/square foot

Common Use Cases

Expressing thermal transmittance rates (U-values) for building components
Calculating heating and cooling load for building envelopes
Comparing insulation effectiveness by relating to material R-values
Reporting radiative heat flux in fire safety and resistance testing
Specifying localized heat loads in high-temperature furnace and plasma heating
Characterizing thermal protection materials under concentrated heat flux exposure

Tips & Best Practices

Always verify the time scale (hour vs second) for consistency when converting values
Use conversion factors accurately to avoid calculation errors
Consider the specific application context such as fire testing or building energy analysis
Remember that Btu (IT) units are based on the International Table standard and may differ from SI units

Limitations

Units represent different time intervals which must be accounted for during conversions
Btu (IT) is a non-SI unit that may reduce interoperability with SI-based systems
High heat fluxes may involve additional factors like material emissivity affecting conversion precision

Frequently Asked Questions

What does Btu (IT)/hour/square foot measure?: It measures the rate of heat transfer per unit area, specifically one British thermal unit transferred per hour over a square foot surface.
Why convert Btu (IT)/hour/square foot to Btu (IT)/second/square foot?: Converting allows comparison between slower heat flux rates common in building analysis and rapid, intense heat fluxes found in fire and high-temperature testing.
Are Btu (IT) units compatible with SI units?: Btu (IT) units are non-SI and based on the International Table standard, which may limit direct interoperability with SI thermal measurements.

Key Terminology

Btu (IT)/hour/square foot: A measure of heat flux density denoting energy transferred per hour across a square foot surface according to the International Table British thermal unit.
Btu (IT)/second/square foot: A unit of heat flux density representing one British thermal unit transferred per second over a square foot surface area.
Thermal transmittance (U-value): The rate at which heat passes through a material per unit area, expressed in units such as Btu (IT)/hour/square foot.

Quick Knowledge Check

What does Btu (IT)/hour/square foot quantify?

Temperature difference across a material

Rate of heat transfer per square foot per hour

Thermal conductivity in watts

Why might someone convert heat flux density to Btu (IT)/second/square foot?

To measure heat flux over a longer time period

To analyze rapid heat flux scenarios like fire testing

To simplify calculations by ignoring time units

What is a limitation of using Btu (IT) units?

They are always less accurate than SI units

They are based on a non-SI standard which affects compatibility

They cannot measure heat flux in burning materials

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