Hydronic Systems: Cooling Tower Operation

SKU: RVI-11502Duration: 20 Minutes

This course has been created with the practical user of water based (hydronic) heating and cooling systems in mind. The goal is to introduce and understand the operation of one of the most basic elements in a hydronic cooling system, the cooling tower. Here, we will convey the fundamentals of the means of heat rejection so that you can responsibly and confidently manage and operate buildings that utilize such systems.

Course Details


Training Time: 20 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Learning Objectives

  • Define key terms and describe their impact on cooling tower operations
  • Describe how to control scale, corrosion, and microbiological growth
  • Understand the typical inspection tasks and frequencies required for cooling towers

Key Questions

The following key questions are answered in this module:

What does hardness refer to?
Hardness refers to the amount of hard calcium and magnesium carbonate scales, such as those found in improperly treated cooling-water systems.

What is alkalinity?
Alkalinity is a measure of the capacity of water to neutralize strong acids.

What is pH?
pH is a measure of the concentration of hydrogen ions, or the acid strength, of a solution.

What is Total Suspended Solids (TSS)?
TSS is the quantity of insoluble material in water that can be removed by filtration.

Which key factors influence whether scale forms?
Key factors that influence whether scale forms include temperature, pH, alkalinity, hardness, and TDS.

Sample Video Transcript

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

Cooling tower water systems provide almost ideal conditions for the growth and proliferation of microorganisms. The nutrients include inorganic and organic compounds introduced via the air that is constantly being induced by the tower fans. According to ASHRAE, more cooling water treatment programs fail because of lack of microbiological control than from any other treatment problem. Scale, corrosion, and fouling are often just symptoms of poor micro-biological control. Makeup water and wind can carry microorganisms into a cooling tower system. Uncontrolled microbiological fouling can lead to problems throughout the cooling water system. Corrosion can occur under the bacterial slime layer. The effects of uncontrolled microbiological activity and fouling may negate the effectiveness of even the best programs for scale prevention and corrosion inhibition. That is why effective microbiological control is an absolute necessity for a cooling-water program to be successful. An effective program to control the growth of microorganisms should include the following: • Proper biocides based on system design, discharge restrictions, and types of microorganisms. • Proper application, dosage, and control of the selected biocides. • And seasonal disinfection cleanings.
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