1. What is an Existing Radiator BTU Calculator?

Definition: This calculator determines the actual BTU output of an existing radiator based on its nominal output and the current temperature difference.

Purpose: It helps HVAC professionals and homeowners accurately assess radiator performance under different operating conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( BTU \) — Adjusted heat output (BTU/h)
• \( \text{Nominal Output} \) — Manufacturer's rated output at ΔT=50K (BTU/h)
• \( \Delta T \) — Actual temperature difference between radiator and room (K)

Explanation: The formula accounts for the non-linear relationship between temperature difference and heat output.

3. Importance of Accurate BTU Calculation

Details: Proper calculation ensures efficient heating system operation, prevents under/over heating, and helps with system balancing.

4. Using the Calculator

Tips: Enter the radiator's nominal output (found on manufacturer's label) and your actual temperature difference. All 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 room temperature (in Kelvin).

Q2: Where do I find nominal output?
A: Check the radiator's specification plate, manufacturer documentation, or product website.

Q3: Why is the exponent 1.3 used?
A: This accounts for the non-linear heat transfer characteristics of radiators (varies slightly by type).

Q4: Does this work for all radiator types?
A: Yes, but panel radiators may use slightly different exponents (1.28-1.33).

Q5: How do I measure ΔT in practice?
A: Measure flow/return temperatures, average them, and subtract room temperature.