1. What Is An HVAC Load Calculation?

An HVAC load calculation determines the total heating or cooling demand for a building by considering all heat gain and loss components. It ensures proper sizing of HVAC equipment for optimal performance and energy efficiency.

2. How Does The Calculator Work?

The calculator uses the HVAC load formula:

Where:

• \( Sensible Heat \) — Heat that causes temperature change (BTU/hr)
• \( Latent Heat \) — Heat associated with moisture/humidity changes (BTU/hr)
• \( Infiltration \) — Heat gain/loss from air leakage (BTU/hr)
• \( Ventilation \) — Heat gain/loss from outdoor air intake (BTU/hr)

Explanation: The equation combines all thermal loads to determine the total capacity required from the HVAC system to maintain comfortable indoor conditions.

3. Importance Of HVAC Load Calculation

Details: Proper HVAC load calculation is essential for selecting correctly sized equipment, preventing energy waste, ensuring comfort, extending equipment lifespan, and meeting building code requirements.

4. Using The Calculator

Tips: Enter all heat components in BTU/hr. Sensible heat includes solar gain, equipment heat, and occupant heat. Latent heat accounts for humidity control. Infiltration and ventilation consider air exchange rates.

5. Frequently Asked Questions (FAQ)

Q1: Why is accurate HVAC load calculation important?
A: Oversized systems short cycle, reducing efficiency and comfort. Undersized systems cannot maintain temperature, leading to discomfort and excessive runtime.

Q2: What factors affect sensible heat load?
A: Building orientation, insulation, windows, internal loads (people, equipment, lighting), and outdoor temperature differences.

Q3: How does latent heat differ from sensible heat?
A: Sensible heat changes air temperature, while latent heat changes moisture content (humidity) without changing temperature.

Q4: What is the difference between infiltration and ventilation?
A: Infiltration is uncontrolled air leakage, while ventilation is intentional outdoor air introduction for indoor air quality.

Q5: When should HVAC load calculations be performed?
A: For new construction, major renovations, equipment replacement, or when experiencing comfort issues in existing buildings.