Why are there different Btu definitions like thermochemical and International Table?

These represent different standards for British thermal units used in thermal conductivity measurements, reflecting variations in how the heat content is defined for engineering calculations.

Can this converter be used for SI units like W/(m·K)?

No, this tool specifically converts between US customary thermal conductivity units. Conversions to SI units generally require additional steps or different tools.

What should I consider when converting thermal conductivity for building materials?

It is important to consider the unit definitions, material thickness uniformity, and steady-state assumptions to ensure accurate thermal performance analysis.

Convert Btu (th) inch/hour/sq. foot/°F to Btu (IT) inch/second/sq. foot/°F

An easy-to-use online converter tool to translate thermal conductivity values from Btu (th) inch/hour/sq. foot/°F to Btu (IT) inch/second/sq. foot/°F, used for building materials and HVAC calculations.

Btu (th) inch/hour/sq. foot/°F

Btu (IT) inch/second/sq. foot/°F

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

Btu (th) inch/hour/sq. foot/°F to Btu (IT) inch/second/sq. foot/°F Conversion Table

Btu (th) inch/hour/sq. foot/°F	Btu (IT) inch/second/sq. foot/°F

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) inch/hour/sq. foot/°F to Btu (IT) inch/second/sq. foot/°F Conversion Table
Btu (th) inch/hour/sq. foot/°F	Btu (IT) inch/second/sq. foot/°F

Explore More Thermal Conductivity Units Converter

What Is This Tool?

This conversion tool helps to change thermal conductivity measurements from Btu (th) inch/hour/sq. foot/°F, based on thermochemical British thermal units per hour, to Btu (IT) inch/second/sq. foot/°F, which uses International Table British thermal units per second. It aids in analyzing how heat flows through materials in US customary engineering contexts.

How to Use This Tool?

Enter the numerical value in Btu (th) inch/hour/sq. foot/°F
Select the appropriate input and output thermal conductivity units
Click the convert button to obtain the equivalent value in Btu (IT) inch/second/sq. foot/°F
Use the result for heat-transfer calculations or building energy modeling
Refer to examples provided to verify your conversion

Key Features

Converts thermal conductivity values between thermochemical and International Table Btu units
Supports building material and insulation thermal performance analysis
Browser-based with straightforward input and output
Provides accurate unit translation for US customary engineering applications
Includes example calculations for easy understanding

Examples

5 Btu (th) inch/hour/sq. foot/°F converts to 0.00138796 Btu (IT) inch/second/sq. foot/°F
10 Btu (th) inch/hour/sq. foot/°F equals 0.00277592 Btu (IT) inch/second/sq. foot/°F

Common Use Cases

Specifying thermal conductivity of insulation boards and foam using thermochemical and International Table Btu units
Performing heat loss or gain calculations for walls, roofs, and windows in building energy simulations
Converting between different British thermal unit standards for HVAC system design
Translating conductivity data to assist with R-value calculations for insulation resistance
Supporting energy modeling and thermal analysis of building envelopes

Tips & Best Practices

Ensure consistent unit selection for input and output to avoid errors
Account for the difference between thermochemical and International Table Btu definitions carefully
Use steady-state and uniform thickness assumptions only when applicable
Verify conversions with example calculations to maintain accuracy
Be aware that additional conversions may be needed when working with SI units

Limitations

Conversion depends on steady-state heat flow and uniform material thickness assumptions
Distinct definitions of Btu units (thermochemical vs International Table) require careful use
The units provided are tailored for US customary engineering contexts and may not directly apply to SI unit systems
Material property variations and non-uniform conditions can affect conversion accuracy

Frequently Asked Questions

Why are there different Btu definitions like thermochemical and International Table?: These represent different standards for British thermal units used in thermal conductivity measurements, reflecting variations in how the heat content is defined for engineering calculations.
Can this converter be used for SI units like W/(m·K)?: No, this tool specifically converts between US customary thermal conductivity units. Conversions to SI units generally require additional steps or different tools.
What should I consider when converting thermal conductivity for building materials?: It is important to consider the unit definitions, material thickness uniformity, and steady-state assumptions to ensure accurate thermal performance analysis.

Key Terminology

Btu (th) inch/hour/sq. foot/°F: A unit expressing heat flow using thermochemical British thermal units per hour through a material one inch thick and one square foot in area for a 1 °F temperature difference.
Btu (IT) inch/second/sq. foot/°F: A thermal conductivity unit indicating heat flow in International Table British thermal units per second through a one-inch thick and one square foot area for a 1 °F temperature difference.
Thermal Conductivity: A material property that measures the ability to conduct heat through a specified thickness and area for a temperature gradient.
Steady-State Conditions: A situation where temperature and heat flow remain constant over time, enabling consistent thermal conductivity measurements.

Quick Knowledge Check

What does Btu (th) inch/hour/sq. foot/°F measure?

Heat flow in International Table Btu per second

Heat flow in thermochemical Btu per hour through a material one inch thick and one square foot in area for a 1 °F difference

Thermal resistance of an insulation material

Why convert from Btu (th) to Btu (IT) units?

To switch thermal conductivity data between thermodynamic and metric units

To translate thermal conductivity values between thermochemical and International Table British thermal unit standards

To convert between US customary and SI units directly

Which assumption is important during this thermal conductivity conversion?

Non-uniform material thickness

Steady-state heat flow across the material

Variable temperature gradients

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