Heat Loss Calculator for House

Heat Loss Formula:

\[ Q = \sum (U \times A \times \Delta T) + \text{losses} \]

U-Value:

W/m²K

Surface Area:

m²

Temperature Difference:

Additional Losses:

Heat Loss (W):

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1. What is a Heat Loss Calculator for House?

Definition: This calculator estimates the heat loss of a house based on U-values, surface areas, temperature differences, and additional losses.

Purpose: It helps homeowners and builders determine heating requirements and improve energy efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = \sum (U \times A \times \Delta T) + \text{losses} \]

Where:

\( Q \) — Total heat loss (Watts)
\( U \) — U-value (W/m²K)
\( A \) — Surface area (m²)
\( \Delta T \) — Temperature difference (Kelvin)
\( \text{losses} \) — Additional heat losses (W)

Explanation: The calculator multiplies U-value by surface area and temperature difference, then adds any additional losses.

3. Importance of Heat Loss Calculation

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

4. Using the Calculator

Tips: Enter the U-value (thermal transmittance), surface area, temperature difference between inside and outside, and any additional losses.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical U-value for walls?
A: Modern insulated walls typically have U-values between 0.15-0.30 W/m²K.

Q2: How do I calculate temperature difference?
A: Subtract the outside temperature from the desired inside temperature (both in °C or K).

Q3: What counts as additional losses?
A: This includes ventilation losses, air infiltration, and thermal bridging effects.

Q4: Should I calculate for each surface separately?
A: For accurate results, calculate walls, windows, roof, and floors separately then sum the results.

Q5: How does this relate to heating system sizing?
A: Your heating system should have slightly more capacity than your calculated heat loss.