HVAC - Air Side: Air Balance Basics

SKU: RVI-11455Duration: 20 Minutes

A Heating, Ventilation and Air Conditioning system (HVAC system) is a group of components working together to "condition" the air in an enclosed space. The components ensure that the air in this space is clean and odor free, and that its temperature, humidity and circulation rate are maintained within desired ranges. This interactive online course focuses primarily on what an HVAC system air balance is, and how to achieve one.

Course Details


Training Time: 20 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Learning Objectives

  • Identify air balancing techniques
  • State two primary goals of an air balancing study
  • List some of the instruments used for air balancing
  • Describe the phenomena which complicates balancing multiple outlet airflows
  • Describe a TAB report

Key Questions

The following key questions are answered in this module:

What is the first law of thermodynamics?
The first law of thermodynamics, also called the law of conservation of energy, states that energy cannot be created or destroyed; it can only change form.

What is heat?
Heat is the amount of energy in matter.

What is sensible heat?
Sensible heat is heat that results in a temperature change only, with no change in phase.

What is enthalpy?
Enthalpy is a property of a substance that is equal to its total internal energy plus the product of it pressure and volume.

What is latent heat?
Latent heat is heat that is used to change the phase of a substance, for example, from a solid to a liquid, or a liquid to a gas.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

The objective of an air balance study is to restore a system to near its design conditions. All measured airflows should fall within 10% of design. This means that prior to starting an air balance, the design conditions should be known. The best source for these numbers is from the as-built HVAC drawings. Additionally, for optimal operation, there should be at least one path with fully open dampers between the supply fan and an air outlet. The purpose of a balancing damper is to meter the volume of air to a specific diffuser. Airflow adjustment is accomplished by changing the position of balance dampers within the ducts. Some systems have a damper at each outlet; some have a single damper at a VAV (variable air volume) box that feeds multiple outlets.
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