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

It measures the heat flux density as one thermochemical British thermal unit transferred per hour through one square foot of area.

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

Conversion ensures alignment with international thermal units for accurate energy code compliance and building performance assessments.

Are these units used only in building science?

They are primarily used in building science, HVAC design, energy code compliance, insulation performance evaluation, and related thermal engineering fields.

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

Learn how to convert heat flux density measurements from thermochemical British thermal units per hour per square foot (Btu (th)/hour/square foot) to International Table units (Btu (IT)/hour/square foot) for accurate building science and HVAC calculations.

Btu (th)/hour/square foot

Btu (IT)/hour/square foot

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

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

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

Explore More Heat Flux Density Units Converter

What Is This Tool?

This converter translates heat flux density values measured in Btu (th)/hour/square foot to Btu (IT)/hour/square foot, ensuring consistency in thermal transmittance assessments and HVAC load sizing.

How to Use This Tool?

Enter the heat flux density value in Btu (th)/hour/square foot
Select the target unit: Btu (IT)/hour/square foot
Click the convert button to get the equivalent value
Use the result for building performance, energy code compliance, or HVAC calculations

Key Features

Converts heat flux density units between Btu (th)/hour/square foot and Btu (IT)/hour/square foot
Helps align measurements with standardized international thermal units
Supports common building science and HVAC applications
Provides easy-to-use browser-based interface

Examples

5 Btu (th)/hour/square foot converts to approximately 4.9967 Btu (IT)/hour/square foot
10 Btu (th)/hour/square foot converts to approximately 9.9933 Btu (IT)/hour/square foot

Common Use Cases

Expressing U‑values of walls, roofs, and windows in building energy codes
Sizing heating and cooling loads for HVAC system design
Evaluating insulation and building assembly thermal performance
Reporting heat flux measurements for energy-code compliance testing

Tips & Best Practices

Always convert to Btu (IT)/hour/square foot to ensure consistency with international standards
Use this conversion when precise heat flux density values are necessary for compliance
Consider the slight difference between Btu (th) and Btu (IT) units in calculations
Validate inputs carefully to avoid minor errors in heat transfer assessments

Limitations

The unit difference is subtle but ignoring it may cause small inaccuracies
Both units assume standard atmospheric conditions; differing conditions may affect results
Applicability is limited to these specific thermal unit definitions

Frequently Asked Questions

What does Btu (th)/hour/square foot measure?: It measures the heat flux density as one thermochemical British thermal unit transferred per hour through one square foot of area.
Why convert Btu (th)/hour/square foot to Btu (IT)/hour/square foot?: Conversion ensures alignment with international thermal units for accurate energy code compliance and building performance assessments.
Are these units used only in building science?: They are primarily used in building science, HVAC design, energy code compliance, insulation performance evaluation, and related thermal engineering fields.

Key Terminology

Btu (th)/hour/square foot: Heat flux density unit measuring thermochemical British thermal units transferred per hour through one square foot.
Btu (IT)/hour/square foot: Heat flux density unit measuring International Table British thermal units transferred per hour per square foot of surface.
Heat Flux Density: The rate of heat transfer per unit area, often used to quantify thermal transmittance.

Quick Knowledge Check

What quantity do Btu (th)/hour/square foot and Btu (IT)/hour/square foot measure?

Electrical power output

Heat flux density (rate of heat transfer per area)

Air velocity in HVAC ducts

Why is converting from Btu (th)/hour/square foot to Btu (IT)/hour/square foot important?

To change from imperial to metric units

To align with international thermal unit standards

To measure cooling load instead of heating load

In which fields is this heat flux density unit conversion commonly used?

Building science and HVAC system design

Automotive engine tuning

Food temperature measurement

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