Central Heating Room Calculator

Heat Loss Formula:

\[ Q_{room} = U \times A \times \Delta T \]

Heat Loss (Q_room):

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1. What is a Central Heating Room Calculator?

Definition: This calculator estimates the heat loss (Q_room) for a room based on U-value, surface area, and temperature difference.

Purpose: It helps HVAC professionals and homeowners determine heating requirements for individual rooms.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q_{room} = U \times A \times \Delta T \]

Where:

\( Q_{room} \) — Heat loss (Watts)
\( U \) — U-value (W/m²K)
\( A \) — Surface area (m²)
\( \Delta T \) — Temperature difference (Kelvin)

Explanation: The U-value represents thermal transmittance, multiplied by area and temperature difference to calculate heat loss.

3. Importance of Heat Loss Calculation

Details: Proper heat loss estimation ensures adequate heating system sizing, energy efficiency, and comfort.

4. Using the Calculator

Tips: Enter the U-value (thermal transmittance), surface area of the room, and temperature difference between inside and outside. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U-value for walls?
A: Modern insulated walls typically have U-values between 0.15-0.35 W/m²K, while older walls may be 1.0-2.0 W/m²K.

Q2: How do I determine ΔT?
A: Subtract the outside design temperature from your desired indoor temperature (e.g., 20°C inside - (-5°C outside) = 25K).

Q3: Should I calculate for each surface separately?
A: For accuracy, calculate walls, windows, roof, and floor separately (with their own U-values) and sum the results.

Q4: Does this include ventilation losses?
A: No, this calculates only transmission losses. Add ventilation losses separately for complete heat load.

Q5: How do I convert the result to BTU/hr?
A: Multiply Watts by 3.412 to get BTU/hr (e.g., 1000W × 3.412 = 3412 BTU/hr).