1. What is Underfloor Heating Design Calculation?

Definition: This calculator estimates the heat output (in BTU/h) required for an underfloor heating system based on floor area, heat requirements, and correction factors.

Purpose: It helps HVAC professionals and homeowners properly size underfloor heating systems for optimal comfort and efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat output (BTU/h)
• \( A \) — Floor area (square feet)
• \( BTU/ft² \) — Heat requirement per square foot (BTU/h·ft²)
• \( F_f \) — Correction factor for floor covering and insulation

Explanation: The floor area is multiplied by the heat requirement and adjusted with a correction factor to account for different floor coverings and insulation levels.

3. Importance of Accurate Calculations

Details: Proper heat output estimation ensures comfortable room temperatures, energy efficiency, and prevents system overloading.

4. Using the Calculator

Tips: Enter the floor area in square feet, heat requirement (default 25 BTU/h·ft²), and correction factor (default 1.2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BTU/ft² value?
A: For residential spaces, 20-30 BTU/h·ft² is common, but this varies by climate and room type.

Q2: How do I determine the correction factor?
A: Use 1.0-1.2 for tile/stone, 1.2-1.4 for wood, and 1.4-1.6 for carpeted floors.

Q3: Does this include heat loss calculations?
A: No, this is a basic calculation. For precise design, consider room insulation and heat loss.

Q4: How do I measure floor area accurately?
A: Measure length × width of each zone, subtracting fixed cabinets or fixtures.

Q5: Should I add a safety margin?
A: Yes, consider adding 10-15% to the calculated value for optimal performance.