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!


Rentex Ready! How Does the New Rentex RFID Inventory Benefit You, the Customer?
August 19, 2022
Rentex has been around since 1980. It's one of the business's biggest and most trusted audio, visual, and computer rentals. The business is transforming for the better after implementing a Read more
Transformational Trends in Energy and Data
August 19, 2022
Speaker of the House Nancy Pelosi’s recent visit to Taipei, Taiwan, sparked controversy when China issued warnings about consequences arising from her making the trip. What led to Speaker Pelosi’s Read more
Soaring Towards Sustainability with Blue Bird
August 19, 2022
Finding the cutting edge in transportation technology has always been the priority for Blue Bird. Founded in 1927, the company is a leading manufacturer of school buses and commercial trucks. To Read more