1. What is a BTU Calculator for Radiators?

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/h)
• \( \Delta T \) — Temperature difference between radiator and room (°F)
• \( K \) — Heat transfer coefficient (BTU/h·ft²·°F)
• \( A \) — Radiator surface area (ft²)

Explanation: The temperature difference multiplied by the heat transfer coefficient and surface area gives the radiator's heat output.

3. Importance of BTU Calculation

Details: Proper heat output estimation ensures adequate heating for spaces and efficient radiator sizing.

4. Using the Calculator

Tips: Enter the temperature difference, heat transfer coefficient (default 5.0 BTU/h·ft²·°F), and radiator surface area. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value for radiators?
A: Most standard radiators have K values between 4.0-6.0 BTU/h·ft²·°F, with 5.0 being a common average.

Q2: How do I determine ΔT?
A: Subtract the desired room temperature from the radiator's average surface temperature.

Q3: What affects the heat transfer coefficient?
A: Material, design, and whether the radiator is finned or flat affect the K value.

Q4: How do I measure radiator surface area?
A: Calculate the total exposed surface area that contacts air (front + back + sides).

Q5: Does this account for heat loss?
A: No, this calculates ideal output. Actual heating needs should consider insulation and heat loss factors.