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How to Convert from Degree Fahrenheit hour/Btu (th) to Degree Fahrenheit hour/Btu (IT)?
Learn how to convert thermal resistance values from degree Fahrenheit hour per Btu (thermochemical) to degree Fahrenheit hour per Btu (International Table) using a precise conversion factor for accurate HVAC and building energy calculations.
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Degree Fahrenheit hour/Btu (th) to Degree Fahrenheit hour/Btu (IT) Conversion Table
| Degree Fahrenheit hour/Btu (th) | Degree Fahrenheit hour/Btu (IT) |
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Custom Unit Conversion Table Generator – Instant Printable Conversion Tables
Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.
Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.
Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.
| Degree Fahrenheit hour/Btu (th) | Degree Fahrenheit hour/Btu (IT) |
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What Is This Tool?
This converter helps transform thermal resistance measurements between two close but distinct units: degree Fahrenheit hour per Btu based on the thermochemical definition (th) and the same unit based on the International Table definition (IT). It ensures consistent and accurate transfer of values used in steady-state heat transfer analyses.
How to Use This Tool?
- Enter the thermal resistance value in degree Fahrenheit hour/Btu (th)
- Select the unit of the value if applicable
- Click convert to obtain the equivalent degree Fahrenheit hour/Btu (IT) value
- Use the converted value in engineering or building energy calculations
Key Features
- Converts thermal resistance values from degree Fahrenheit hour/Btu (th) to degree Fahrenheit hour/Btu (IT)
- Supports steady-state heat flow calculations in customary engineering units
- Facilitates comparison between imperial and U.S. customary thermal resistance units
- Provides precise conversion factor to handle subtle differences between Btu definitions
- Useful for HVAC, building-energy analysis, and thermal-network modeling
Examples
- 5 degree Fahrenheit hour/Btu (th) equals 5.00334608 degree Fahrenheit hour/Btu (IT)
- 10 degree Fahrenheit hour/Btu (th) converts to 10.006692161 degree Fahrenheit hour/Btu (IT)
Common Use Cases
- Calculating steady-state heat flow and temperature difference in building assemblies using customary units
- Specifying thermal resistance for equipment or building components in thermal-network models
- Converting and comparing thermal resistances when combining reports using imperial and U.S. customary systems
- Forming area-normalized insulation R-values following U.S. construction standards
- Ensuring compatibility of thermal resistance data across different Btu definitions in HVAC engineering
Tips & Best Practices
- Always verify the definition of Btu used in thermal resistance data before converting
- Use this conversion when exact thermal resistance values are critical for system performance
- Apply the conversion factor precisely to maintain consistency in engineering analyses
- Combine converted thermal resistance values with correct heat flow units for accurate results
Limitations
- The difference between thermochemical and International Table Btu definitions is very small but significant for precise calculations
- Conversion is close to unity but not exact, so neglecting it can cause errors in accurate thermal resistance assessments
- Users must ensure the correct unit definition is applied to avoid inconsistencies
Frequently Asked Questions
- Why do I need to convert between degree Fahrenheit hour/Btu (th) and degree Fahrenheit hour/Btu (IT)?
- Because the Btu definitions differ slightly between thermochemical and International Table standards, this conversion ensures thermal resistance values remain consistent for precise engineering calculations.
- Is the conversion factor between these units large?
- No, the conversion factor is very close to 1, but even small differences can impact accuracy in detailed thermal resistance and heat transfer evaluations.
- Can this converter be used for SI units of thermal resistance?
- No, this tool specifically converts between two U.S. customary thermal resistance units that differ by Btu definitions, not between SI units.
Key Terminology
- Degree Fahrenheit hour/Btu (th)
- A thermal resistance unit based on the thermochemical Btu definition, representing a temperature difference of one °F per one Btu per hour heat flow.
- Degree Fahrenheit hour/Btu (IT)
- A U.S. customary thermal resistance unit using the International Table definition of the Btu for steady-state heat transfer calculations.
- Thermal Resistance
- A measure of a material or assembly's resistance to heat flow, often expressed as the ratio of temperature difference to heat flow rate.
- Btu (British thermal unit)
- A unit of heat energy used in U.S. customary units with different defined values in thermochemical and International Table standards.