1. What is a Radiator Heat Output Calculator?

Definition: This calculator estimates the actual heat output of a radiator based on its nominal output and the temperature difference between the radiator and surrounding air.

Purpose: It helps HVAC professionals and homeowners determine the effective heating capacity of radiators under different operating conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Output — Actual heat output (Watts)
• Nominal — Manufacturer's rated output at ΔT=50K (Watts)
• ΔT — Temperature difference between radiator and room (Kelvin)

Explanation: The formula accounts for the non-linear relationship between temperature difference and heat output, with the exponent 1.3 representing typical radiator characteristics.

3. Importance of Heat Output Calculation

Details: Accurate heat output calculation ensures proper radiator sizing for efficient room heating and energy savings.

4. Using the Calculator

Tips: Enter the nominal output (from radiator specifications) and the temperature difference between radiator surface and room air. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is ΔT (temperature difference)?
A: It's the difference between the average radiator temperature and the room air temperature (typically 50K for nominal ratings).

Q2: Why is the exponent 1.3 used?
A: This value accounts for the non-linear heat transfer characteristics of most radiators, combining convection and radiation effects.

Q3: How do I find the nominal output?
A: Check the radiator manufacturer's specifications, usually given for ΔT=50K (e.g., 70/55/20°C flow/return/room temperatures).

Q4: Can I use this for underfloor heating?
A: No, this formula is specific to radiators. Underfloor heating systems have different heat emission characteristics.

Q5: What if my radiator has multiple panels?
A: Use the nominal output for the complete radiator (all panels combined) in the calculation.