Heat Loss Perimeter Calculator

Heat Loss Formula:

\[ Q = Perimeter \times Height \times U \times \Delta T \]

Perimeter:

Height:

U Value:

W/m²K

ΔT (Temperature Difference):

Heat Loss (Q):

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1. What Is Heat Loss From Perimeter Walls?

Heat loss from perimeter walls refers to the thermal energy that escapes through the external walls of a building. This calculation is essential for determining heating requirements, energy efficiency, and insulation needs in building design and analysis.

2. How Does The Calculator Work?

The calculator uses the heat loss formula:

\[ Q = Perimeter \times Height \times U \times \Delta T \]

Where:

\( Q \) — Heat loss (Watts)
\( Perimeter \) — Total length of external walls (meters)
\( Height \) — Wall height (meters)
\( U \) — Thermal transmittance coefficient (W/m²K)
\( \Delta T \) — Temperature difference between inside and outside (Kelvin)

Explanation: This formula calculates the rate of heat transfer through perimeter walls based on wall area, insulation properties, and temperature gradient.

3. Importance Of Heat Loss Calculation

Details: Accurate heat loss calculation is crucial for proper HVAC system sizing, energy efficiency assessments, building code compliance, and determining insulation requirements to minimize energy consumption.

4. Using The Calculator

Tips: Enter perimeter in meters, height in meters, U value in W/m²K, and temperature difference in Kelvin. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the U value in heat loss calculations?
A: The U value (thermal transmittance) measures how well a building element conducts heat. Lower U values indicate better insulation properties.

Q2: How do I determine the temperature difference (ΔT)?
A: ΔT is the difference between indoor design temperature and outdoor design temperature. Typical values range from 20-30K depending on climate and building use.

Q3: What are typical U values for different wall types?
A: Uninsulated brick walls: 1.5-2.0 W/m²K, insulated cavity walls: 0.3-0.6 W/m²K, well-insulated modern walls: 0.1-0.3 W/m²K.

Q4: Does this calculation include all heat losses?
A: No, this calculates only perimeter wall losses. Total building heat loss includes windows, doors, roof, floor, and infiltration losses.

Q5: How can I reduce perimeter heat loss?
A: Improve insulation, reduce thermal bridging, use double/triple glazing, seal air leaks, and consider thermal mass strategies.