Understanding Cycles of Concentration


Cycles of concentration, or often stated as just cycles, is a core concept when controlling boiler or cooling tower water systems. Running cycles too high can lead scale and corrosion. Running cycles too low can lead to wasted water.

But what is really meant by the phrase “cycles of concentration?” Basically, it is telling us how many times the water in the boiler or cooling tower has been concentrated compared to the makeup water.

The next logical question may be “What do you mean by the water being concentrated in boilers or cooling towers?”

Both boilers and cooling towers function by evaporating water. In a boiler, fuel is burned to turn water into steam. In a cooling tower, evaporation occurs as air is blown across the water to remove the heat picked up from air conditioning a building or cooling a manufacturing process.

As water is evaporated in both the boiler and cooling tower systems, primarily only pure water leaves the system. Other impurities, such as calcium, sodium, and chlorides, are left behind and concentrate in the remaining liquid water. Imagine boiling a pot of water on the stove until only a fraction of the water is left. This remaining water will start to look cloudy as impurities are concentrated.

Also, as water evaporates, fresh makeup water must be added to the boiler or cooling tower system to maintain water levels so they do not run dry. As you may imagine, the makeup water brings more impurities into the system to be left behind as water evaporates.
You now may be wondering, “Why do I care about cycles of concentration?”

First, if certain impurities concentrate too much in water, they can precipitate out of solution and form insulating scale, which can lead to greater fuel consumption, higher energy costs, plugged piping, corrosion, and more. Second, there is an upper limit on where a boiler or cooling tower can be operated without forming scale. Third, operating too far below this limit only wastes water and increases the total cost of operation.

“How are cycles of concentration controlled?” Cycles are controlled by wasting or blowing down a portion of the concentrated boiler or cooling tower water and replacing it with fresh makeup water diluting the impurities.

Typically, this process is automated with controllers and monitored by periodic analytical testing.

Optimizing your cycles of concentration can help reduce wasted water, minimize scale and corrosion potential, and more.

To maximize your savings, contact Chem-Aqua today.

For the latest news, videos, and podcasts in the Building Management Industry, be sure to subscribe to our industry publication.

Follow us on social media for the latest updates in B2B!

Twitter – @MarketScale
Facebook – facebook.com/marketscale
LinkedIn – linkedin.com/company/marketscale

Follow us on social media for the latest updates in B2B!



Listen Carefully, Respond Creatively
April 12, 2024

In this captivating episode of the Fans First series, Jesse Cole, the mastermind behind the Savannah Bananas, delves into the transformative business philosophy of “listen carefully, respond creatively.” This approach has not only skyrocketed the Savannah Bananas to fame but also serves as a universal blueprint for revolutionizing customer service and engagement across all sectors. […]

Read More
Stacey Childress, Senior Advisor at McKinsey and Company, discusses higher ed
Bold Measures are Needed to Improve Investment in Higher Education
April 12, 2024

The stakes for higher education have never been higher as the educational landscape sees rapid evolution. As universities and colleges grapple with the dual challenges of technological disruption and increasing demands for accessible, quality education, the question of how best to implement investment in higher education becomes a priority. This debate has been ignited […]

Read More
wake up healthy
Hey, it’s 9 am… Wake up Healthy with 9amHealth!
April 12, 2024

Healthcare Rethink host Brian Urban explores ways to wake up healthy and stay healthy with his guest, Dr. Avantika Waring, MD, the Chief Medical Officer, at 9amHealth. This episode delves into the transformative approach to healthcare delivery championed by 9amHealth. Dr. Waring’s journey from a humanities student with a love for French to a […]

Read More
public safety and security
Strengthen Public Safety and Security: Modernize Radio Communication for Better Field Response
April 11, 2024

The importance of radio communication within public safety and security operations remains unbeaten in an era dominated by digital transformation. This medium, essential for over a century, continues to be the lifeline for responders on the front lines. From ensuring the safety of field agents to facilitating real-time critical information flow and enhancing situational […]

Read More