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HVAC Load Equation:
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HVAC load calculation determines the amount of heating and cooling needed to maintain comfortable indoor conditions. It consists of sensible load (temperature-related) and latent load (humidity-related) components.
The calculator uses the HVAC load equation:
Where:
Explanation: The total HVAC load represents the combined energy required to control both temperature and humidity levels in a space.
Details: Accurate load calculation is essential for proper HVAC system sizing, energy efficiency, occupant comfort, and preventing system short-cycling or inadequate performance.
Tips: Enter sensible and latent load values in BTU. Both values must be valid (≥0). The calculator will sum them to provide the total HVAC load.
Q1: What is the difference between sensible and latent load?
A: Sensible load relates to temperature change (sensible heat), while latent load relates to moisture removal (latent heat of vaporization).
Q2: How are sensible and latent loads typically measured?
A: They are calculated based on building characteristics, occupancy, equipment, and environmental conditions using specialized software or manual calculations.
Q3: What is a typical ratio between sensible and latent loads?
A: The ratio varies by climate and application, but typically ranges from 60:40 to 80:20 (sensible:latent) for cooling applications.
Q4: Why is proper load calculation important for HVAC systems?
A: Oversized systems short-cycle, reducing efficiency and humidity control. Undersized systems cannot maintain comfort conditions.
Q5: Can this calculator be used for both heating and cooling loads?
A: While the basic principle applies to both, heating typically involves primarily sensible load with minimal latent component.