1. What is a Radiator BTU Calculator?

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

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/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 heat output depends on how much hotter the radiator is than the room, the radiator's efficiency at transferring heat, and its physical size.

3. Importance of Radiator Heat Calculation

Details: Proper heat output estimation ensures comfortable room temperatures, 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 ΔT value?
A: Usually 50-70°F difference between radiator surface and room temperature.

Q2: How do I find the K value for my radiator?
A: Check manufacturer specs - typical values range from 1.2 to 1.8 BTU/h·ft²·°F.

Q3: How do I measure radiator surface area?
A: Calculate total exposed surface area including fins or convectors.

Q4: What affects heat transfer coefficient?
A: Material (cast iron vs. steel), fin design, and water flow rate.

Q5: How does this relate to room heating requirements?
A: Compare calculated BTU output to room heat loss calculations.