1. What is a Radiator BTU Output Calculator?

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

Purpose: It helps HVAC professionals and homeowners determine appropriate radiator sizes for heating requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The heat output increases with greater temperature difference, better heat transfer materials, and larger radiator surfaces.

3. Importance of Radiator Sizing

Details: Proper radiator sizing ensures efficient heating, energy savings, and comfortable room temperatures.

4. Using the Calculator

Tips: Enter the temperature difference (typically 50-70°F), heat transfer coefficient (default 1.5 for standard radiators), and radiator surface area. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical ΔT value?
A: Usually 50-70°F (average water temp of 180°F minus room temp of 70°F = 110°F ΔT).

Q2: How do I find the K factor?
A: Check manufacturer specs - typical values range from 1.2-2.0 BTU/h·ft²·°F.

Q3: What affects radiator surface area?
A: Number/size of fins, pipe diameter, and radiator length/height.

Q4: How does this relate to room size?
A: Generally, you need 20-30 BTU per square foot of room space.

Q5: Can I use this for baseboard heaters?
A: Yes, but K factors differ (typically 0.8-1.2 for baseboard units).