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Cooling Tower - Marriott Koolina » pdf file

 

Case Study - Hotel Cooling Tower
Scale and Bio

Updated on January 7, 2014

 

Installer: Nano Tek--On, LLC. (HydroFLOW distributor in Hawaii).

Customer: MarrioL Koolina Beach Club, Oahu, Hawaii, USA.

Application: 500 Ton Cooling Tower.

Installed unit: HydroFLOW Custom 14" water conditioner on a cast iron pipe feeding the chillers.

Water source: Calcium Carbonate hardness of roughly 200 ppm and Silica hardness of roughly 50 ppm.

Installation date: September 10, 2013.

 

Success factors:• Reduce chemical usage by up to 75% while keeping the cooling tower readings within acceptable parameters.

• Significantly reduce maintenance costs.

• Reduce blow down water usage by up to 75%.

 

System diagram and installation point: 

 

HydroFLOW Water Conditioner

 

Installed HydroFLOW water condi2oner:

 

One of the 3 chillers:

 

Total bacteria count in the tower's recirculating water:

 

 

Baseline measurement with 100% biocide
(under 1,000 CFU)

 

Biocide chemicals kept CFU levels at a minimum

 

 

After 1.5 months with 50% less biocide

(between 1,000 to 5,000 CFU)

 

Slight raise in CFU count as HydroFLOW began to remove biofilm from the cooling tower

 

 

After 3 months with 75% less biocide

(under 1,000 CFU)

 

CFU count reduced back to under 1,000 CFU 

 

Blow down water consumption: 

 

* Prior to the installation of HydroFLOW, the conductivity of the cooling tower was maintained at roughly 1,500 S via constant blow down (opened drain valve). The goal was to maintain conductivity between 1,500 to 1,800 S while reducing water usage by up to 50% and keeping the cooling tower free of scale accumulation.

 

Note: Since the automatic blow down mechanism was not opera;onal, blow down was reduced by slightly closing the valve every 1-2 weeks. 

 

Other readings:

Iron - Fluctuated between 0.00 to 0.07.

Alkalinity - Started at 240. One week after HydroFLOW was installed it reduced to 180 and remained at that value.

Nitrate - Fluctuated between 560 to 640.

 

Results:

1. Lime scale accumulaVon stopped as soon as HydroFLOW was installed.

2. Anti-scalant and Anti-corrosive were completely discontinued after 1.5 months.

3. ExisVng scale and biofilm deposits were gradually removed.

4. After reducing the biocide by 75%, the total bacteria counts conVnued to be minimal.

5. Blow down was reduced by 75%. Note: Blow down can be reduced further with 10% side stream filtration.

6. Efficiency of chillers was maintained (no scale and biofilm accumulaVon in chiller tubes).

7. Under one year Return on Investment (ROI).