HVAC – Is Water Treatment Necessary?

Drum-Kickers, Soap Salesmen…they have been called many things. Water Treatment specialists (probably the name they prefer) are everywhere. As a mechanical contractor, we have had many knock on our door. With most large commercial buildings and industrial facilities in Memphis employing water cooling/heating mechanical equipment, this industry is highly competitive, but is water treatment really necessary? In this edition of Mechanical Matters® I am going to answer that very question and discuss several other important facts about water treatment sets.

In this edition I want to answer three questions regarding water treatment:

Exactly what is water treatment and is it necessary?

How does improper water treatment service effect mechanical equipment?

Are there energy savings with water treatment?

1. Exactly what is water treatment and is it necessary?

Water treatment describes a course of action used to make water more permissible for a desired end-use. These can include use as drinking water, industrial processes, medical and many other uses.

The goal of all water treatment course of action is to remove existing elements in the water, improving it for later utilization. (Wikipedia.org)

In the mechanical industry water treatment is a method used to optimize most water-based mechanical and industrial processes, such as: heating, cooling, processing, cleaning, and rinsing, so that operating costs and risks are reduced.

Most water treatment programs include water softeners, inhibitors and other chemicals needed to ‘treat’ the water in order to reach the desired conditions for mechanical use and heat move. Products used to continue proper water conditions are often fed automatically by complex equipment directly into a chiller or boiler’s water. Water is used for both cooling and heating in large commercial building applications. In most industrial environments water is used for cooling production equipment or an ingredient to making a product. How the water is used will determine what kind of treatment is necessary.

Most water treatment companies use test kits and chemical dispensing systems which have made the use of water treatment chemicals in chiller, boiler and cooling-tower systems much easier. But attention to details, such as how often systems are tested, is basic to system performance. The correct water treatment chemistry at the correct time is extraordinarily important because already minor problems can create major costs.

Last week I sat down to breakfast with Gary Reynolds and Bob Schubert of Garratt Callahan. They are water treatment ‘specialists’. Gary and I have worked together with several mutual customers. Their attention to detail, customer service and great knowledge of water treatment is why many buildings in the Mid-South are in good hands with Garratt Callahan. In our meeting they provided me with some great information about the importance of water treatment, the effects of poor service and things to look for in choosing a service provider

2. How does poor or no service effect mechanical equipment?

Improper Water Treatment or no treatment at all will increase your energy consumption and operating cost while decreasing your mechanical equipment’s efficiencies and life expectancy. A well designed and implemented water treatment program is highly important to the operation of any steam boiler, centrifugal chiller and cooling tower. All three of the systems shown below utilize water for cooling and heating.

Poor water treatment lets water interact with the surfaces of pipes and vessels which contain it. Steam boilers can extent up or corrode, and these deposits will average more fuel is needed to heat the same amount of water. Cooling towers can extent up and corrode, but left untreated, the warm, dirty water they can contain will encourage bacteria to grow, and Legionnaires’ Disease can be the fatal consequence. The condenser tubes within a chiller and other water cooling equipment can also extent up and corrode consequently preventing good heat move. Increased energy consumption and poor cooling performance is shared consequence in inefficient water treatment.

Water treatment can often be categorized as ‘low-tech’ and unglamorous. However, the right chemicals, proper chemical satisfy equipment, and a dedicated service provider is basic to your mechanical equipment and should be ‘treated’ with top priority.

3. Are there energy savings with water treatment?

Treatment Value: Expert water treatment can cut your water, energy, and maintenance costs significantly. Perhaps most important of all, it can save you the cost of fixing or replacing equipment that’s been damaged by inadequate water treatment – including the downtime and lost revenue usually associated with solving such problems.

The examples of water treatment ROI (Return of Investment) shown below show how very thin layers of deposited material from poorly treated water can excursion up energy costs.

extent

System: 1,000 ton chiller

Operation: 12 hours/day, 365 days/year

Cost of electricity: $0.10/kWh

extent thickness: 1/32 inch

Elimination of 1/32 inch of extent saved $15,018 per year.

Biological Fouling

System: 1,000 ton chiller

Operation: 12 hours/day, 365 days/year

Cost of electricity: $0.10/kWh

Bio-film thickness: 1/1000 inch

Elimination of 1/1000 inch of bio-film saved $26,834 per year.

“As little as 3/16-inch of extent can cause a boiler system to use 38 percent more fuel. The most tiny amount of dissolved oxygen in the water also method a system could be headed for corrosion problems. And already a thin inner of bacterial slime in chiller tubes can considerably affect heat-move efficiency.”

Wrap Up:

As mechanical contractors we are no strangers to the importance of water treatment. However, after researching and writing this article I can assure you that I am much more informed about the necessity and advantage to having a good water treatment program.

In this edition Mechanical Matters®, I discussed three important facts about chemical water treatment. First we learned the definition of water treatment and its use in the mechanical industry. Second, we learned that water treatment is definitely necessary, and without it your mechanical equipment will suffer. Last we learned how proper water treatment will save energy, and ultimately increase your bottom line.

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