1. What is a Room Heat Loss Calculator?

Definition: This calculator estimates the heat loss from a room to determine the required radiator output for central heating systems.

Purpose: It helps homeowners and heating professionals properly size radiators for efficient room heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Heat loss (Watts)
• \( U \) — U-value of surfaces (W/m²K)
• \( A \) — Surface area (m²)
• \( \Delta T \) — Temperature difference between inside and outside (°C)

Explanation: The calculator multiplies the U-value (thermal transmittance) by the surface area and temperature difference to determine heat loss.

3. Importance of Heat Loss Calculation

Details: Accurate heat loss calculations ensure properly sized heating systems that are energy efficient and provide adequate comfort.

4. Using the Calculator

Tips: Enter the U-value of your room surfaces, total surface area, and the desired temperature difference between inside and outside.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U-value for walls?
A: Modern insulated walls typically have U-values of 0.3 W/m²K, while older walls might be 1.5 W/m²K or higher.

Q2: How do I calculate total surface area?
A: Measure all external walls, windows, doors, floor and ceiling areas that lose heat to the outside.

Q3: What temperature difference should I use?
A: Use the difference between your desired room temperature and the lowest expected outside temperature.

Q4: Should I add a safety factor?
A: It's common to add 10-20% to the calculated heat loss to account for unusual weather conditions.

Q5: How do I convert this to radiator size?
A: Radiators are typically rated in BTU/hr or Watts - use the calculated heat loss value to select appropriately sized radiators.