In a water-cooled chiller plant, the cooling tower is where the heat finally leaves the building, and it is also the part of the plant most often neglected. In Saudi Arabia, high temperatures, dust, hard make-up water and long running hours make cooling tower maintenance and water treatment essential for efficiency, equipment life and health and safety.
Why Cooling Tower Condition Drives Chiller Energy Use
A cooling tower cools the condenser water that serves the chillers. If the tower is fouled, scaled or poorly balanced, the condenser water returns warmer, condensing pressure rises and the chiller compressors work harder to deliver the same cooling. Scale that builds up in the tower usually also builds up inside the chiller’s condenser tubes, cutting heat transfer further. Good tower maintenance is therefore one of the cheapest ways to lower a plant’s kW per ton.
Water Treatment: The Three Problems to Control
1. Scale
As water evaporates, dissolved minerals concentrate. Without control, they deposit as scale on fill, nozzles and condenser tubes. Treatment programs control this with blowdown (bleed-off) based on conductivity, plus scale inhibitors dosed to match the make-up water chemistry.
2. Corrosion
Warm, oxygen-rich water corrodes steel piping, tower basins and heat exchangers. Corrosion inhibitors, correct pH control and corrosion coupons to monitor results are standard parts of a program.
3. Biological growth and Legionella
Cooling towers create warm, wet conditions where algae, biofilm and bacteria such as Legionella can grow, and drift can carry droplets into the air. A sound program includes biocide dosing, regular microbiological testing, effective drift eliminators and a written water management plan with clear responsibilities.
Cooling Tower Maintenance Checklist
Weekly or monthly
- Check water treatment dosing equipment, chemical stock and controller readings (conductivity, pH).
- Inspect the basin for sludge, sand and debris; check make-up float valves and overflow.
- Check fan motor, belts or gearbox, vibration and unusual noise.
- Inspect spray nozzles and distribution for blockages and even flow.
- Review water test results with the treatment specialist.
Quarterly
- Clean strainers and inspect drift eliminators.
- Check gearbox oil level and condition; lubricate bearings.
- Inspect fill for scaling, sagging or damage.
- Verify VFD operation and fan staging in the BMS.
Annually (or as required)
- Drain, clean and disinfect the tower according to the water management plan.
- Inspect structure, casing and basin for corrosion and leaks; repair coatings.
- Replace damaged fill and drift eliminators.
- Balance water flow between cells and check approach temperature against design.
- Coordinate the tower service with chiller condenser tube cleaning, ideally before summer. See our chiller maintenance checklist.
Saudi Conditions That Change the Plan
Dust and sand
Open towers scrub dust from the air. In Riyadh and inland industrial cities, basins fill with sediment quickly, so side-stream filtration and more frequent basin cleaning are often worth it.
Coastal humidity in Jeddah and the Eastern Province
Higher wet-bulb temperatures reduce how cold the tower can make the water, so towers must be sized and maintained for real local design conditions. Salt-laden air also speeds up corrosion of steel components and fan motors.
Water cost and availability
Make-up water can be expensive or limited. Running at the highest safe cycles of concentration, fixing overflow and drift losses, and metering make-up and blowdown helps reduce consumption without risking scale.
When to Upgrade Instead of Repair
- Fill is heavily scaled or collapsed and the approach temperature cannot be recovered.
- The casing or basin is badly corroded and leaking.
- Fans run at fixed speed with no VFD, wasting energy at part load.
- The plant has been expanded and the towers are undersized.
Frequently Asked Questions
How often should a cooling tower be cleaned in Saudi Arabia?
Basins and strainers need checking monthly, with a full clean and disinfection at least once a year, more often for dusty sites or if water testing shows a problem.
Who should handle water treatment?
A specialist water treatment provider should design and monitor the chemistry, while the maintenance contractor keeps the mechanical side, dosing equipment and records in order. Saudi ProTech coordinates both under one maintenance contract.
Can a better-maintained tower reduce chiller power?
Yes. Lower condenser water temperature and clean condenser tubes reduce compressor lift, which reduces electricity use for the same cooling.
Cooling Tower and Chiller Plant Services
Saudi ProTech installs and maintains water-cooled chiller plants, cooling towers and condenser water systems for factories, hotels, hospitals and large commercial buildings. Learn about our chiller installation and maintenance, HVAC maintenance contracts and chilled water systems, or contact our team in Jeddah, Riyadh, Dammam or Khobar.
