Heat Loss Calculator Canada

Heat Loss Formula (Canadian Codes):

\[ Q = UA \Delta T + \text{ventilation} \]

U-value (Heat Transfer Coefficient):

W/m²K

Surface Area:

m²

Temperature Difference (ΔT):

Ventilation Heat Loss:

Total Heat Loss (Q):

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1. What is a Heat Loss Calculator for Canada?

Definition: This calculator estimates heat loss in buildings according to Canadian codes and standards, accounting for conduction and ventilation losses.

Purpose: It helps architects, engineers, and homeowners determine heating requirements for buildings in Canada's climate.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q = UA \Delta T + \text{ventilation} \]

Where:

\( Q \) — Total heat loss (Watts)
\( U \) — U-value/heat transfer coefficient (W/m²K)
\( A \) — Surface area (m²)
\( \Delta T \) — Temperature difference between inside and outside (Kelvin)
ventilation — Additional heat loss from air exchange (Watts)

Explanation: The formula calculates conductive heat loss through building elements plus any additional ventilation losses.

3. Importance of Heat Loss Calculation

Details: Accurate heat loss calculations are essential for proper HVAC system sizing, energy efficiency, and compliance with Canadian building codes.

4. Using the Calculator

Tips: Enter the U-value of your building element, its surface area, the design temperature difference, and any known ventilation losses. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical U-values for Canadian homes?
A: Modern homes typically have U-values between 0.15-0.35 W/m²K for walls, depending on insulation levels and local code requirements.

Q2: How do I determine ΔT for my location?
A: Use the design outdoor temperature from your local building code (often -15°C to -30°C in Canada) minus your desired indoor temperature (typically 20°C).

Q3: What's included in ventilation heat loss?
A: This accounts for heat lost through air infiltration and mechanical ventilation. It can be calculated separately using air exchange rates.

Q4: Are there Canadian standards for this calculation?
A: Yes, refer to the National Building Code of Canada (NBC) and CSA standards for official calculation methods.

Q5: Should I add a safety factor?
A: Canadian practice often includes a 10-15% safety factor to account for uncertainties in the calculation.