1. What is a Heat Load Calculator?

Definition: This calculator estimates the heat load of a room based on U-value, surface area, temperature difference, and infiltration heat loss.

Purpose: It helps HVAC professionals and engineers determine heating requirements for buildings and rooms.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HL \) — Heat load (Watts)
• \( U \) — U-value (W/m²K)
• \( A \) — Surface area (m²)
• \( \Delta T \) — Temperature difference (Kelvin)
• \( I \) — Infiltration heat loss (Watts)

Explanation: The formula calculates conductive heat loss through surfaces plus additional heat loss from air infiltration.

3. Importance of Heat Load Calculation

Details: Accurate heat load calculations ensure proper HVAC system sizing, energy efficiency, and occupant comfort.

4. Using the Calculator

Tips: Enter the U-value, surface area, temperature difference, and any infiltration heat loss. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is U-value?
A: U-value measures how well a building element conducts heat (lower values mean better insulation).

Q2: How do I determine temperature difference?
A: Subtract the desired indoor temperature from the outdoor design temperature (both in °C or K).

Q3: What's included in infiltration heat loss?
A: Heat loss from air leaks, typically calculated separately based on air changes per hour.

Q4: Should I include internal heat gains?
A: This calculator focuses on heat loss. For complete load analysis, subtract internal gains (people, equipment, etc.).

Q5: How accurate is this calculation?
A: It provides a basic estimate. Professional calculations consider more factors like orientation, thermal mass, etc.