Infiltration Heat Loss Formula

Infiltration Heat Loss Formula:

\[ Q = C \times A \times \Delta T \]

Heat Loss (Q):

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1. What is the Infiltration Heat Loss Formula?

The Infiltration Heat Loss Formula calculates heat loss due to air infiltration in buildings. It estimates the amount of heat energy lost when outside air enters a building through cracks, openings, and other leakage points.

2. How Does the Calculator Work?

The calculator uses the infiltration heat loss formula:

\[ Q = C \times A \times \Delta T \]

Where:

\( Q \) — Heat loss due to infiltration (BTU/hr)
\( C \) — Infiltration coefficient (CFM/ft²)
\( A \) — Area through which infiltration occurs (ft²)
\( \Delta T \) — Temperature difference between inside and outside (°F)

Explanation: The formula accounts for the volume of air infiltrating through building envelope and the temperature difference driving the heat transfer.

3. Importance of Infiltration Heat Loss Calculation

Details: Accurate infiltration heat loss calculation is crucial for proper HVAC system sizing, energy efficiency analysis, building envelope design, and determining heating load requirements for buildings.

4. Using the Calculator

Tips: Enter infiltration coefficient in CFM/ft², area in square feet, and temperature difference in °F. All values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical infiltration coefficient value?
A: Infiltration coefficients vary by building type and construction quality, typically ranging from 0.1 to 1.0 CFM/ft² for standard buildings.

Q2: How does building tightness affect infiltration?
A: Tighter buildings have lower infiltration coefficients, resulting in less heat loss and better energy efficiency.

Q3: When is infiltration heat loss most significant?
A: Infiltration heat loss is most significant in older buildings, during windy conditions, and in climates with large temperature differences.

Q4: How can infiltration be reduced?
A: Infiltration can be reduced through weather stripping, caulking, improved window and door seals, and better building envelope construction.

Q5: What's the difference between infiltration and ventilation?
A: Infiltration is uncontrolled air leakage, while ventilation is intentional, controlled air exchange for indoor air quality purposes.