Radiant Heat Layout Calculator

Radiant Heat Formula:

\[ Q = A \times \frac{BTU}{ft^2} \times F_f \]

Heat Output (Q): BTU/h

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1. What is a Radiant Heat Layout Calculator?

Definition: This calculator estimates the heat output (in BTUs) required for radiant heating systems based on area, heat load, and adjustment factors.

Purpose: It helps HVAC professionals and designers properly size radiant heating systems for floors, walls, or ceilings.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = A \times \frac{BTU}{ft^2} \times F_f \]

Where:

\( Q \) — Heat output (BTU/hour)
\( A \) — Area to be heated (square feet)
\( \frac{BTU}{ft^2} \) — Heat load per square foot
\( F_f \) — Adjustment factor for system type and conditions

Explanation: The area is multiplied by the required heat load and adjusted for specific installation factors.

3. Importance of Radiant Heat Calculation

Details: Accurate calculations ensure comfortable heating, energy efficiency, and proper system sizing to avoid under- or over-heating.

4. Using the Calculator

Tips: Enter the area in square feet, heat load (default 30 BTU/h·ft²), and adjustment factor (default 1.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU/ft² value?
A: Residential spaces typically need 25-35 BTU/h·ft², while bathrooms may need 40-50 BTU/h·ft².

Q2: When would I adjust the factor (F_f)?
A: Adjust for high ceilings (1.1-1.3), well-insulated spaces (0.8-0.9), or commercial applications (1.2-1.5).

Q3: Does this work for all radiant systems?
A: Yes, for hydronic (water) and electric systems, though factors may differ.

Q4: How do I determine the heat load?
A: Use a heat loss calculation or consult local building codes for requirements.

Q5: Does this include safety margins?
A: No, consider adding 10-15% to the calculated value for design safety margins.