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

Greener future in HVAC
Scale Smarter in HVAC: Balancing Growth with Employee Engagement
May 27, 2025

The HVAC industry is undergoing significant growth, driven by increased suburban migration and a surge in home renovations requiring system upgrades. The U.S. HVAC market is projected to expand at a compound annual growth rate (CAGR) of 7.4% from 2025 to 2030. As businesses scale to meet this demand, balancing expansion with retaining strong…

Read More
educational choice
Educational Choice Isn’t Enough—Implementation Will Make or Break It
May 26, 2025

The U.S. education landscape is undergoing a seismic shift as more states adopt education savings accounts (ESAs), signaling a broader push toward personalized, parent-directed learning and broader educational choice. With over a dozen states now offering universal ESA programs, debates around school choice have reached a new level of urgency. Throughout 2024, enthusiasm for…

Read More
women in security
Breaking Barriers: Women Leading in the Security Industry
May 26, 2025

Despite growing gender diversity in many industries, the security field continues to be largely male-dominated. However, that landscape is evolving as more women in security step into leadership roles, challenge long-standing norms, and contribute to a more inclusive culture. Through mentorship, development programs, and increased visibility, this shift is not only empowering individuals but also…

Read More
risk intelligence
Securing the Future: AI, Risk Intelligence & The Protection of High-Value Assets
May 26, 2025

From AI-driven surveillance to dynamic mobile guarding, the way we secure commercial real estate, corporate campuses, and critical infrastructure is undergoing a major transformation. As high-value assets face increasingly complex threats, security is no longer just about cameras and guards—it’s about predictive insights, global awareness, and resilience planning. According to a Securitas discussion, real-time risk…

Read More