Cooling Basics

SKU: RVI-11474Duration: 20 Minutes

Did you know there are two types of cooling systems used in HVAC applications? Cooling systems remove heat from air - sensible heat from the gases in air and latent heat from the water vapor in air - in order to produce the desired temperatures and humidity levels in enclosed spaces. This interactive online course covers sensible heat and latent heat, British thermal units, the three laws of thermodynamics, and the cooling equipment that is used in HVAC systems.

Course Details


Training Time: 20 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Learning Objectives

  • Define "British Thermal Unit," or "BTU"
  • Describe the difference between Sensible Heat and Latent Heat
  • Define "Enthalpy"
  • List the three Laws of Thermodynamics
  • Describe various types of cooling equipment

Key Questions

The following key questions are answered in this module:

What is the difference between sensible heat and latent heat?
Sensible heat is the heat that results in a temperature change only, with no change in state or phase, while latent heat is the heat energy that is used to change the phase of a substance - from solid to liquid, or liquid to gas.

What is a British Thermal Unit (BTU)?
One BTU is the amount of heat energy required to heat one pound of liquid water by one-degree Fahrenheit.

What is Thermodynamics?
Thermodynamics is a branch of science that deals with the movement of heat between objects or systems, and any related property changes.

How is energy transferred?
Energy can be transferred via conduction, convection, and radiation.

What are the types of cooling systems used in commercial and industrial HVAC applications?
The two types of cooling systems used in commercial and industrial HVAC applications are direct expansion or DX systems and chilled water or chiller systems.

Sample Video Transcript

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

The Second Law of Thermodynamics governs the direction of heat transfer, and makes heating, air conditioning, and refrigeration possible. It states that energy must flow from a higher state to a lower state. In other words, heat always moves from hot to cold. Also, heat stops moving when temperatures are equal. The Second Law governs how air is cooled in an AHU; heat is removed from the air by passing it through a coil that is cooler than the entering air.
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