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Can DM water be used in Cooling Tower?

Q. Is DM water a suitable utility for cooling in equipment? Let's say we have a cooling tower running with DM water, so does DM water have properties which creates less heat transfer as compared to other types of water?

Aditya Nagori
Employee - Himachal Pradesh, India
September 1, 2023

A. Hi Aditya
I have personally never heard of including the quality or conductivity of the water into any heat transfer calculations. However, DM water should have less of a tendency to form scale over time, so in the long term it may be better for heat transfer.
Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha - Pine Beach, New Jersey

⇩ Related postings, oldest first ⇩

Q. Hi,

I am arul kumar, working as design engineer in Chennai. I am designing a cooling tower. I have to use the DM water for that as the water is going into precision equipment. I know that DM water in contact with air will generate carbonic acid. I am going to add pH booster. will it enough or any special precautions should I take. Will pH will develop rapidly or gradually in the circuit.


Arul Kumar K.
product designer - Chennai, Tamil Nadu, India
May 19, 2008

A. Hi, Arul. pH change and carbonic acid are only the beginning of your problems! Cooling towers are open to the atmosphere and will collect garbage of all sorts unsuited to 'precision equipment' from pollen to acorns to bird droppings to acid rain :-(

But there is a special type of cooling tower that may suit your needs, called an "atmospheric cooler" or "evaporative condenser" or such (the name probably varies by geography, but every cooling tower manufacturer will be familiar with it).

In this device, there are two circuits, one exposed to the atmosphere and one not exposed. It functions like a combination cooling tower and heat exchanger but is much cheaper & simpler than two separate units, and costs little more than a standard cooling tower.


Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey
May 19, 2008

Reuse regenerated water in Cooling tower as a makeup

Q. Is there any possibility to reuse to the regenerated water generated and used as a makeup in Cooling tower. this is reduced the effluent generation and save the raw water.
DM water technique: Ion Exchange with (Raw water tank to Pump-- Sand Filter--SAC--Degasser--WBA--SBA---MB--DM Water)..

ASHISH kumar
September 4, 2018

A. Apologies Ashish, but I have little idea what you're talking about :-(
Are you saying you want to collect the backwash water after regeneration of these ion exchange columns and use it in your cooling tower? That sounds like a questionable idea because even when clean water is used you must have a 'blow-down' rate to keep the contaminants in the cooling tower water from getting too concentrated.
Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha - Pine Beach, New Jersey

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