1. What is a Radiator Heat Output Calculator?

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 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 increases with greater temperature difference, better heat transfer materials, and larger radiator surfaces.

3. Importance of Heat Output 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 1.5 BTU/h·ft²·°F for cast iron), and radiator surface area. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical ΔT for residential radiators?
A: Typically 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 or use 1.5 for cast iron, 2.0 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 1.5-2) to account for increased surface from fins.

Q4: Does this account for heat loss in pipes?
A: No, this calculates only the radiator output. Pipe losses should be calculated separately.

Q5: How does this relate to room size?
A: Generally, you need 20-30 BTU/h per square foot of room space, depending on insulation.