1. What is a Heat Load Calculator HVAC?

Definition: This calculator determines the total heat load for HVAC systems by summing heat losses and gains in a space.

Purpose: It helps HVAC professionals and engineers properly size heating and cooling equipment for buildings.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Load \) — Total heat load (BTU/h)
• \( Losses \) — Heat lost through walls, windows, etc. (BTU/h)
• \( Gains \) — Heat gained from occupants, equipment, etc. (BTU/h)

Explanation: The total heat load is the sum of all heat losses (transmission, infiltration) and heat gains (solar, internal).

3. Importance of Heat Load Calculation

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

4. Using the Calculator

Tips: Enter the total heat losses and heat gains in BTU/h. Values must be ≥ 0. For detailed component calculations, use our advanced HVAC tools.

5. Frequently Asked Questions (FAQ)

Q1: What are typical heat loss sources?
A: Transmission through walls/roof (30-60%), infiltration (15-30%), and ventilation (10-25%).

Q2: What are common heat gain sources?
A: Solar radiation (25-40%), occupants (5-15%), lighting (10-20%), and equipment (15-30%).

Q3: How do I find my heat loss/gain values?
A: Use our detailed Heat Loss Calculator and Heat Gain Calculator tools for component-by-component analysis.

Q4: What's a good safety factor to add?
A: Typically add 10-20% to the calculated load for system capacity.

Q5: How does this relate to HVAC sizing?
A: The total load determines the required capacity of heating and cooling equipment.