Why convert between Btu (IT)/hour/square foot and Btu (th)/hour/square foot?

Different standards of British thermal units exist, so converting ensures measurements align with the required energy codes and accurate building science analysis.

What is the main application of this unit conversion?

It is primarily used for expressing and comparing heat flux density in building envelope performance, insulation evaluations, and HVAC load calculations.

Can this conversion be used for dynamic heat transfer scenarios?

This conversion assumes steady-state conditions; dynamic or variable scenarios may reduce accuracy.

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

Learn how to convert heat flux density measurements from Btu (IT)/hour/square foot to Btu (th)/hour/square foot for accuracy in building science and HVAC applications.

Btu (IT)/hour/square foot

Btu (th)/hour/square foot

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

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

Btu (IT)/hour/square foot	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.

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

Explore More Heat Flux Density Units Converter

What Is This Tool?

This tool converts heat flux density values from Btu (IT)/hour/square foot, which uses the International Table British thermal unit, to Btu (th)/hour/square foot, based on the thermochemical British thermal unit. It helps standardize thermal transmittance measurements across building and HVAC applications.

How to Use This Tool?

Enter the heat flux density value in Btu (IT)/hour/square foot.
Select the unit you are converting from and the target unit Btu (th)/hour/square foot.
Click convert to get the equivalent value in Btu (th)/hour/square foot.
Use the result to support energy code compliance and HVAC calculations.

Key Features

Converts between two recognized British thermal unit heat flux density units.
Includes conversion aligned with building energy codes for U-values and thermal transmittance.
Offers easy calculations for HVAC load sizing and insulation performance comparisons.
Browser-based and simple to use for professionals and students alike.

Examples

5 Btu (IT)/hour/square foot converts to approximately 5.0033460805 Btu (th)/hour/square foot.
10 Btu (IT)/hour/square foot converts to approximately 10.006692161 Btu (th)/hour/square foot.

Common Use Cases

Expressing thermal transmittance (U-values) in building specifications.
Sizing heating and cooling loads by calculating heat loss or gain.
Comparing insulation and assembly performance in construction.
Reporting heat flux in building energy code compliance and tests.

Tips & Best Practices

Verify the unit standard required by your project to ensure consistency.
Apply this conversion when comparing measurements based on different British thermal unit definitions.
Use the tool in steady-state conditions with uniform surface assumptions for accuracy.

Limitations

Small differences between International Table Btu and thermochemical Btu can accumulate in precise calculations.
Conversion assumes steady-state heat transfer and uniform surface area, which may not always apply in real-world scenarios.

Frequently Asked Questions

Why convert between Btu (IT)/hour/square foot and Btu (th)/hour/square foot?: Different standards of British thermal units exist, so converting ensures measurements align with the required energy codes and accurate building science analysis.
What is the main application of this unit conversion?: It is primarily used for expressing and comparing heat flux density in building envelope performance, insulation evaluations, and HVAC load calculations.
Can this conversion be used for dynamic heat transfer scenarios?: This conversion assumes steady-state conditions; dynamic or variable scenarios may reduce accuracy.

Key Terminology

Btu (IT)/hour/square foot: A heat flux density unit based on the International Table British thermal unit transferred per hour per square foot of surface area.
Btu (th)/hour/square foot: A heat flux density unit that uses the thermochemical British thermal unit transferred per hour through one square foot of area.
Thermal Transmittance (U-value): A measure of heat transfer rate through a building element per unit area, often expressed in Btu per hour per square foot.

Quick Knowledge Check

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

Heat flux density using thermochemical Btu

Heat flux density using International Table Btu

Energy consumption per hour

Why is the conversion between Btu (IT) and Btu (th) important?

To evaluate insulation R-values accurately

To align measurements with different British thermal unit standards

To calculate electrical power usage

What assumption is made during this heat flux density conversion?

Non-uniform surface area conditions

Steady-state heat transfer and uniform surface area

Variable thermal transmittance

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