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

It measures heat flux density based on the International Table British thermal unit transferred per hour across one square foot of surface.

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

Converting to this unit allows heat flux density to be expressed per second using the thermochemical Btu unit, which is helpful in precise engineering and thermal analyses.

Can this tool be used for transient heat flux cases?

The converter assumes steady-state or average heat flux values; highly dynamic or transient scenarios may require more advanced modeling.

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

Learn how to convert heat flux density units from Btu (IT)/hour/square foot to Btu (th)/second/square foot with this easy-to-use online converter. Ideal for building energy analysis and thermal engineering.

Btu (IT)/hour/square foot

Btu (th)/second/square foot

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

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

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

Explore More Heat Flux Density Units Converter

What Is This Tool?

This converter transforms heat flux density values measured in Btu (IT)/hour/square foot into Btu (th)/second/square foot. It helps users convert hourly heat transfer rates based on the International Table British thermal unit to per-second rates based on the thermochemical British thermal unit, facilitating thermal system design and energy analysis.

How to Use This Tool?

Enter the heat flux density value in Btu (IT)/hour/square foot.
Select the target unit as Btu (th)/second/square foot.
Click the convert button to get the equivalent value.
Use the converted output for thermal transfer calculations or design.

Key Features

Converts heat flux density between two specific British thermal unit based units.
Supports building science, HVAC, fire testing, and thermal engineering applications.
Provides a precise conversion factor based on established unit definitions.
Browser-based and easy to use with straightforward input and output.

Examples

10 Btu (IT)/hour/square foot converts to 0.002779637 Btu (th)/second/square foot.
100 Btu (IT)/hour/square foot converts to 0.02779637 Btu (th)/second/square foot.

Common Use Cases

Determining U-values for building codes and thermal transmittance specifications.
Sizing heating and cooling loads and calculating heat loss or gain in buildings.
Expressing heat transfer rates in HVAC and building-envelope designs.
Assessing surface heat flux in fire exposure and material flammability testing.

Tips & Best Practices

Confirm which Btu definition applies to avoid conversion discrepancies.
Use this conversion for steady-state or average heat flux measurements.
Ensure accurate input of surface area and time values for reliable results.
Use the tool for dynamic thermal system design requiring per-second resolution.

Limitations

Btu unit differences (International Table vs. thermochemical) may cause slight variations.
Conversion is best suited for steady-state or average flux values, not transient conditions.
Precise surface area and time measurement are essential for accuracy.
Does not account for complex or highly dynamic heat transfer scenarios.

Frequently Asked Questions

What does Btu (IT)/hour/square foot measure?: It measures heat flux density based on the International Table British thermal unit transferred per hour across one square foot of surface.
Why convert to Btu (th)/second/square foot?: Converting to this unit allows heat flux density to be expressed per second using the thermochemical Btu unit, which is helpful in precise engineering and thermal analyses.
Can this tool be used for transient heat flux cases?: The converter assumes steady-state or average heat flux values; highly dynamic or transient scenarios may require more advanced modeling.

Key Terminology

Btu (IT)/hour/square foot: A heat flux density unit representing one International Table British thermal unit transferred per hour across one square foot.
Btu (th)/second/square foot: A heat flux density unit indicating one thermochemical British thermal unit transferred per second across one square foot.
Heat Flux Density: The rate of heat transfer per unit area, often used in building science and thermal engineering.

Quick Knowledge Check

What is the main use of the Btu (IT)/hour/square foot unit?

Measuring electrical current

Expressing heat flux density based on International Table Btu per hour

Calculating liquid flow rates

Which unit is used to express heat flux density per second?

Btu (IT)/hour/square foot

Btu (th)/second/square foot

Watts per meter

Why might conversion between these units show slight variations?

Due to differences in Btu unit definitions

Because of different surface area measurements

Due to time zone differences

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