1. What is Radiator BTU Output?

Definition: This calculator estimates the heat output of a radiator based on temperature difference, heat transfer coefficient, and surface area.

Purpose: It helps HVAC professionals and homeowners determine radiator performance for heating system design.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The temperature difference drives heat transfer, multiplied by the radiator's efficiency and size.

3. Importance of BTU Calculation

Details: Proper heat output estimation ensures adequate room heating, energy efficiency, and correct radiator sizing.

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's a typical ΔT for residential radiators?
A: Usually 30-50°F difference between radiator surface and room temperature.

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.

Q3: Does this work for all radiator types?
A: Yes, but K values vary between cast iron, steel panel, and finned-tube radiators.

Q4: How do I measure radiator surface area?
A: Calculate total exposed surface area including fins and multiply by 1.5 for finned radiators.

Q5: Why use BTU/hour units?
A: BTU/hour is the standard measurement for heating system capacity in the US.