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

It measures the rate of heat transfer per unit area using British thermal units (thermochemical) per second over one square foot.

When should I use horsepower (metric)/square foot?

Use it when heat flux is expressed in metric horsepower distributed over one square foot, common in systems mixing metric power units with Imperial area units.

Can I use this conversion for transient heat flux?

No, this conversion assumes steady-state heat flux and is not designed for transient or time-varying thermal conditions.

How to Convert from Btu (th)/second/square foot to Horsepower (metric)/square foot

Learn how to convert heat flux density values from Btu (th)/second/square foot to horsepower (metric)/square foot with this easy-to-use online converter, useful in HVAC, building science, and industrial thermal applications.

Btu (th)/second/square foot

Horsepower (metric)/square foot

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

Btu (th)/second/square foot to Horsepower (metric)/square foot Conversion Table

Btu (th)/second/square foot	Horsepower (metric)/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)/second/square foot to Horsepower (metric)/square foot Conversion Table
Btu (th)/second/square foot	Horsepower (metric)/square foot

Explore More Heat Flux Density Units Converter

What Is This Tool?

This tool converts heat flux density measurements from Btu (th)/second/square foot to horsepower (metric)/square foot. It facilitates expressing the rate of heat transfer per unit area between Imperial power units and metric horsepower, retaining area measurements in square feet.

How to Use This Tool?

Enter the value in Btu (th)/second/square foot you want to convert.
Select horsepower (metric)/square foot as the output unit.
Click the convert button to see the result instantly.
Refer to the provided formula and examples for clarity.

Key Features

Converts heat flux density between Imperial and metric mixed units.
Supports engineering and building science unit standards.
Browser-based and simple to use with no installation required.
Displays formulas and examples for clear understanding.
Useful for HVAC, industrial furnace, boiler, and fire safety applications.

Examples

2 Btu (th)/second/square foot converts to 2.8670348236 horsepower (metric)/square foot.
0.5 Btu (th)/second/square foot converts to 0.7167587059 horsepower (metric)/square foot.

Common Use Cases

Specifying heat transfer through walls, windows, or insulation in building energy analysis.
Quantifying radiative or convective heat loads on equipment in thermal system design.
Converting surface heat loads for industrial furnaces, boilers, or radiators mixing metric horsepower and Imperial area units.
Assessing surface heat flux in fire-exposure testing and material flammability evaluations.
Thermal analysis of engine cooling surfaces or heat-exchanger faces involving mixed unit systems.

Tips & Best Practices

Always ensure consistent use of heat and area unit definitions during conversion.
Use this tool for steady-state heat flux conditions to ensure meaningful results.
Double-check mixed unit engineering documents to apply the correct conversion.
Consider unit preferences and rounding standards relevant to your region or industry.

Limitations

Accuracy depends on using exact unit definitions for heat and area.
Regional unit preferences and rounding differences may cause minor discrepancies.
Does not account for transient or dynamic thermal conditions—only steady-state flux.

Frequently Asked Questions

What does Btu (th)/second/square foot measure?: It measures the rate of heat transfer per unit area using British thermal units (thermochemical) per second over one square foot.
When should I use horsepower (metric)/square foot?: Use it when heat flux is expressed in metric horsepower distributed over one square foot, common in systems mixing metric power units with Imperial area units.
Can I use this conversion for transient heat flux?: No, this conversion assumes steady-state heat flux and is not designed for transient or time-varying thermal conditions.

Key Terminology

Heat Flux Density: The measure of heat transfer rate per unit area, indicating how much thermal energy passes through a surface over time.
Btu (th)/second/square foot: A unit expressing heat flux density using thermochemical British thermal units per second distributed over one square foot.
Horsepower (metric)/square foot: A heat flux density unit expressing power as metric horsepower distributed over one square foot area.
Steady-state Heat Flux: Heat flux condition where thermal transfer rate remains constant over time without transient effects.

Quick Knowledge Check

What quantity does Btu (th)/second/square foot represent?

Energy per time per square meter

Heat flux density in British thermal units over square foot per second

Power in watts per square foot

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

To express heat flux using Newtons per square foot

To express heat flux density compatible with metric horsepower power units while keeping area in square feet

To change the area unit to square meters

What is a key limitation of this conversion?

It cannot be used with steady-state conditions

Differences in unit definitions and rounding can cause discrepancies

It converts temperature units instead of heat flux

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