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

It measures heat flux density as the heat transferred per hour through one square foot of area, commonly used in building science and HVAC.

In which fields is Btu (th)/second/square inch commonly used?

It is typically used in fire testing, welding, plasma torch experiments, and industrial furnace surface heat input measurements.

Why is the conversion factor very small?

Because it converts from heat flux per hour and larger area units to per second and much smaller area units, intensifying the measure and thus resulting in a small numeric factor.

Can I directly compare values in Btu (th)/hour/square foot with Btu (th)/second/square inch?

No, these units represent heat flux at very different scales of area and time, so care must be taken when comparing or interpreting values.

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

Learn to convert heat flux density values from Btu (th)/hour/square foot to Btu (th)/second/square inch with this accurate, easy-to-use unit converter. Ideal for building science, HVAC, fire protection, and industrial applications.

Btu (th)/hour/square foot

Btu (th)/second/square inch

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

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

Btu (th)/hour/square foot	Btu (th)/second/square inch

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

Explore More Heat Flux Density Units Converter

What Is This Tool?

This tool converts heat flux density measurements from Btu (th)/hour/square foot to Btu (th)/second/square inch, facilitating translations between building science and high-intensity heat flux engineering units.

How to Use This Tool?

Enter the numerical value in Btu (th)/hour/square foot
Select Btu (th)/hour/square foot as the input unit
Choose Btu (th)/second/square inch as the desired output unit
Click the convert button to see the result expressed in Btu (th)/second/square inch

Key Features

Converts heat flux density units used in building science and HVAC to those used in fire protection and industrial settings
Provides precise conversion based on the defined rate between Btu (th)/hour/square foot and Btu (th)/second/square inch
Supports quick calculations for both small and large values
Browser-based and easy to use with no installation required

Examples

10 Btu (th)/hour/square foot equals 0.000019290123456805 Btu (th)/second/square inch
100 Btu (th)/hour/square foot converts to 0.00019290123456805 Btu (th)/second/square inch

Common Use Cases

Expressing window, wall, and roof U-factors or insulation heat loss per unit area in building science
Sizing HVAC loads by calculating heat transfer rates through building envelope elements
Conducting fire testing and fire-protection engineering to quantify radiant heat flux exposure
Characterizing high localized heat loads from welding, plasma torches, or propulsion plumes
Specifying heat input on small surface areas in industrial furnace or burner testing using imperial units

Tips & Best Practices

Use appropriate unit conventions depending on the application context—building science vs. fire protection or industrial testing
Maintain sufficient significant figures when converting small values due to the very small conversion factor
Understand that Btu (th)/second/square inch reflects much higher intensities over smaller areas and shorter times compared to Btu (th)/hour/square foot
Double-check conversions when dealing with vastly different area and time scales to ensure correct interpretation

Limitations

The conversion covers very different scales of area and time, so values may not be directly comparable in practical contexts
Due to the small conversion factor, rounding errors can impact precision if insufficient decimal places are used
Users must be cautious interpreting results as the converted unit represents much more intense heat fluxes over smaller areas and shorter durations

Frequently Asked Questions

What does Btu (th)/hour/square foot measure?: It measures heat flux density as the heat transferred per hour through one square foot of area, commonly used in building science and HVAC.
In which fields is Btu (th)/second/square inch commonly used?: It is typically used in fire testing, welding, plasma torch experiments, and industrial furnace surface heat input measurements.
Why is the conversion factor very small?: Because it converts from heat flux per hour and larger area units to per second and much smaller area units, intensifying the measure and thus resulting in a small numeric factor.
Can I directly compare values in Btu (th)/hour/square foot with Btu (th)/second/square inch?: No, these units represent heat flux at very different scales of area and time, so care must be taken when comparing or interpreting values.

Key Terminology

Btu (th)/hour/square foot: A heat flux density unit indicating thermochemical British thermal units of heat transferred per hour per square foot, common in building science.
Btu (th)/second/square inch: A heat flux density unit representing British thermal units of energy transferred per second per square inch, used in fire protection and high-intensity heat load contexts.
Heat flux density: The rate of heat energy transfer through a surface per unit area.

Quick Knowledge Check

What does the unit Btu (th)/hour/square foot quantify?

Energy per second over a square inch

Heat flux density as heat transferred per hour through one square foot

Power input to an industrial furnace surface

Which application typically uses Btu (th)/second/square inch?

Sizing HVAC loads in buildings

Fire testing and radiant heat flux measurement

Calculating insulation heat loss per square foot

Why should users be careful with this unit conversion?

Because the units represent similar scales and times

Because small conversion factors and different area/time scales may affect precision and interpretation

Because both units measure heat flux in the same way

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