1. What is a Central Heating Radiators BTU Calculator?

Definition: This calculator estimates the heat output (in BTUs) of central heating radiators based on temperature difference, heat transfer coefficient, and surface area.

Purpose: It helps HVAC professionals and homeowners determine the heating capacity needed for rooms or buildings.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat output (BTU/h)
• \( \Delta T \) — Temperature difference between radiator and room (°F)
• \( K \) — Heat transfer coefficient (BTU/h·ft²·°F)
• \( A \) — Radiator surface area (ft²)

Explanation: The temperature difference multiplied by the radiator's efficiency and size determines its heat output.

3. Importance of BTU Calculation

Details: Proper BTU estimation ensures adequate heating, energy efficiency, and correct radiator sizing for spaces.

4. Using the Calculator

Tips: Enter the temperature difference, heat transfer coefficient (default 5.0), and radiator surface area. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical ΔT value?
A: Standard calculations use ΔT=50°F (180°F water temp - 70°F room temp), but actual values vary by system.

Q2: How do I find the K value for my radiator?
A: Check manufacturer specifications - typical values range from 4-6 BTU/h·ft²·°F for standard radiators.

Q3: What if my radiator has multiple panels?
A: Multiply the single panel area by the number of panels for total surface area (A).

Q4: How does radiator material affect results?
A: Material affects K value - cast iron radiators typically have lower K values than aluminum ones.

Q5: Should I include a safety factor?
A: Yes, consider adding 10-20% to the calculated BTU for heat loss through windows and walls.