BTU Calculator for Radiators

Radiator Heat Output Formula:

\[ Q = \Delta T \times K \times A \]

Temperature Difference (ΔT):

°F

Material Constant (K):

BTU/h·ft²·°F

Surface Area (A):

ft²

Heat Output (Q): BTU/h

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is a BTU Calculator for Radiators?

Definition: This calculator estimates the heat output of radiators based on temperature difference, material constant, 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:

\[ Q = \Delta T \times K \times A \]

Where:

\( Q \) — Heat output (BTU/hour)
\( \Delta T \) — Temperature difference between radiator and room (°F)
\( K \) — Material constant (BTU/hour·ft²·°F)
\( A \) — Radiator surface area (ft²)

Explanation: The temperature difference multiplied by material constant and surface area gives the heat output.

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, material constant (default 5.0), and surface area. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value for radiators?
A: Cast iron radiators typically have K values around 5.0, while steel panel radiators may range from 3.5 to 6.0.

Q2: How do I measure temperature difference?
A: Subtract room temperature from average radiator surface temperature.

Q3: What affects the K value?
A: Material type, radiator design, and surface finish all influence the K value.

Q4: How do I find radiator surface area?
A: Check manufacturer specifications or calculate based on radiator dimensions.

Q5: Does this include heat loss factors?
A: No, consider adding 10-20% to account for pipe heat loss and other factors.