1. What is a Radiator BTU Output Calculator?

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

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

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 drives heat transfer, multiplied by the radiator's efficiency and size.

3. Importance of Radiator Heat 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 (typically 50-70°F), heat transfer coefficient (default 1.5), and radiator surface area. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical temperature difference (ΔT)?
A: For steam radiators, ΔT is typically 150-170°F (steam) minus room temp (70°F) = 80-100°F difference.

Q2: How do I find the K value for my radiator?
A: Check manufacturer specs or use 1.5 for cast iron, 1.7 for aluminum, 1.3 for steel panel radiators.

Q3: How do I measure radiator surface area?
A: Calculate total exposed surface area including fins and multiply by a factor (typically 1.5) to account for increased surface area.

Q4: Does this include heat loss in pipes?
A: No, this calculates only the radiator output. Account for 10-15% heat loss in distribution pipes.

Q5: How does water temperature affect output?
A: Higher water temperature increases ΔT, which linearly increases heat output (Q).