1. What is a Radiator BTU Calculator?

Definition: This calculator estimates the heat output (in BTUs) of a radiator based on its dimensions, heat transfer factor, and temperature difference.

Purpose: It helps HVAC professionals and homeowners determine the heating capacity of radiators for proper room heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( BTU \) — Heat output (British Thermal Units per hour)
• \( Length \) — Length of radiator (feet)
• \( Width \) — Width of radiator (feet)
• \( Factor \) — Heat transfer coefficient (BTU/ft² K)
• \( \Delta T \) — Temperature difference between radiator and room (Kelvin)

Explanation: The radiator's surface area (length × width) multiplied by its heat transfer efficiency and the temperature difference gives its heat output.

3. Importance of Radiator BTU Calculation

Details: Proper BTU calculation ensures adequate room heating, energy efficiency, and correct radiator sizing for the space.

4. Using the Calculator

Tips: Enter the radiator dimensions in feet, heat transfer factor (default 150 BTU/ft² K), and temperature difference (default 50K). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is ΔT (Delta T)?
A: It's the temperature difference between the radiator surface and the room air temperature, measured in Kelvin.

Q2: What's a typical heat transfer factor?
A: Standard radiators typically have a factor of 150 BTU/ft² K, but this varies by material and design.

Q3: How do I determine the right ΔT?
A: Subtract room temperature from radiator surface temperature. For example, 180°F radiator in 70°F room = 110°F difference ≈ 61K.

Q4: Can I use this for baseboard heaters?
A: Yes, but the factor may be different (typically 200-250 BTU/ft² K for finned tube baseboard).

Q5: How many BTUs do I need per square foot?
A: Typically 20-30 BTU/sq.ft for average insulation, but this varies by climate and building characteristics.