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!

Image

Latest

the career game loop
Unity’s Jessica Lindl on Playing the Career Game Loop: Learning to Earn in the New Economy (Episode 2)
June 16, 2025

Today’s workforce is facing profound disruption, driven by automation, AI, and shrinking entry-level job opportunities. According to SignalFire’s 2025 State of Talent report, entry-level hiring in tech has dropped by 50% from pre-pandemic levels. In this shifting landscape, younger workers aren’t just seeking jobs—they’re demanding agency, feedback, and purpose. Game-based learning models like…

Read More
career game loop
Unity’s Jessica Lindl on Playing the Career Game Loop: Learning to Earn in the New Economy (Episode 1)
June 16, 2025

As traditional career paths break down, economic mobility is being redefined by adaptability, not academic credentials. Today, 52% of college graduates are underemployed a year after graduation, working in roles that don’t require a four-year degree. Meanwhile, networking strategies like informational interviews yield one job offer per 12 conversations—far more effective than the one-in-200…

Read More
Equipping FENs in the UK with Tools to Thrive | Annesha Archyangelio | EP#4 - Live from ICN
Equipping FENs in the UK with Tools to Thrive – Live from ICN
June 13, 2025

In this final ICN 2025 episode recorded on the floor of the International Council of Nurses Congress in Helsinki, host Lea Sims welcomes Annesha Archyangelio, Regional Director of Nursing for NHS England. A Jamaican-born, UK-based nursing leader, Annesha shares her powerful personal migration story and how it inspired her to create tools and guidance…

Read More
Advancing Global Competency Frameworks for the Nursing Profession - Live from ICN
Advancing Global Competency Frameworks for the Nursing Profession – Live from ICN
June 13, 2025

In this special episode recorded at the 2025 International Council of Nurses Congress in Helsinki, host Lea Sims sits down with Professor Sylvia Fung, President of the Hong Kong Academy of Nursing & Midwifery, and Professor Ying Zhou of Guangzhou Huashang College. Together, they discuss how the nursing profession is evolving in Asia and the…

Read More