1. What is BTU Calculation for Radiators?

The BTU (British Thermal Unit) calculation estimates heat output from cast iron radiators based on surface area, heat transfer factor, and temperature difference. This helps in proper heating system design and radiator sizing.

2. How Does the Calculator Work?

The calculator uses the BTU calculation formula:

Where:

• \( \text{Surface Area} \) — Radiator surface area in square feet (ft²)
• \( \text{Factor} \) — Heat transfer factor in BTU per hour per square foot per °F
• \( \Delta T \) — Temperature difference between radiator and room in °F

Explanation: The formula calculates the heat output based on the radiator's physical characteristics and operating conditions.

3. Importance of BTU Calculation

Details: Accurate BTU calculation is essential for proper heating system design, ensuring adequate heat output for room size, and optimizing energy efficiency.

4. Using the Calculator

Tips: Enter surface area in square feet, heat transfer factor in BTU/hr ft² °F, and temperature difference in °F. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical heat transfer factor for cast iron radiators?
A: Typical factors range from 1.0 to 2.5 BTU/hr ft² °F depending on radiator design and finish.

Q2: How do I measure radiator surface area?
A: Calculate the total exposed surface area including fins and front/back surfaces. Manufacturer specifications are most accurate.

Q3: What temperature difference should I use?
A: Use the difference between average radiator surface temperature and desired room temperature, typically 100-150°F for steam systems.

Q4: Can this calculator be used for other radiator types?
A: While designed for cast iron, it can be adapted for other materials by adjusting the heat transfer factor appropriately.

Q5: How accurate are these calculations?
A: Calculations provide good estimates but actual performance may vary based on installation, airflow, and maintenance conditions.