1. What is HVAC Load Calculation?

HVAC load calculation is the process of determining the heating and cooling requirements for a building. It involves calculating the sensible load (temperature-related), latent load (humidity-related), and ventilation load (fresh air requirements) to properly size HVAC equipment.

2. How Does the Calculator Work?

The calculator uses the fundamental HVAC load equation:

Where:

• \( Sensible Load \) — Heat gain/loss that changes air temperature (BTU/h)
• \( Latent Load \) — Heat gain/loss from moisture addition/removal (BTU/h)
• \( Ventilation Load \) — Heat gain/loss from outdoor air requirements (BTU/h)

Explanation: This equation provides the total HVAC system capacity needed to maintain comfortable indoor conditions.

3. Importance of HVAC Load Estimation

Details: Accurate load calculation is essential for proper HVAC system sizing, energy efficiency, occupant comfort, and preventing equipment failure due to undersizing or oversizing.

4. Using the Calculator

Tips: Enter sensible, latent, and ventilation loads in BTU/h. All values must be non-negative. The calculator will sum the components to provide total HVAC load requirements.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between sensible and latent load?
A: Sensible load affects dry-bulb temperature, while latent load affects humidity levels and involves phase changes of moisture.

Q2: How do I determine individual load components?
A: Load components are calculated based on building characteristics, occupancy, equipment, and climate conditions using manual J or similar methods.

Q3: Why is proper load calculation important?
A: Oversized systems short-cycle reducing efficiency and comfort; undersized systems cannot maintain temperature and humidity levels.

Q4: What factors affect ventilation load?
A: Outdoor air requirements, building occupancy, infiltration rates, and local building codes all influence ventilation load calculations.

Q5: Can this calculator be used for commercial buildings?
A: Yes, but commercial calculations often require more detailed analysis including internal loads, building orientation, and specific occupancy patterns.