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HVS-DAS System

Automatic Micro-Adjustment & Optimisation of Chiller's
Set-Point to Extract Further Energy Savings of Chillers

ECA SYSTEM

HVS-ECA System for Cooling Tower

CHALLENGES IN LEGIONELLA WATER MANAGEMENT IN COOLING TOWERS:

Major cooling tower cleaning process including cold water basin, hot water basins and infills will dislodge and churn up stagnant biofilm, algae, organic mass – hence resulting in sudden slough of suspended solids in the water basins which is likely to result in a sudden release of legionella bacteria encapsulated in those stagnant biofilm, algae or organic mass. Obtaining water samples for legionella testing immediately after major cooling tower washings will yield results not reflecting the actual steady-state conditions of the circulating water. Hence, it is strongly recommended that no major/massive cleaning of cooling towers to be conducted at least 4 weeks prior to any scheduled quarterly mandatory water sample collection for legionella testing by accredited lab.

Legionella bacteria is naturally present in the environment. Due the operational nature whereby air is being such into the cooling towers continuously, legionella bacteria could and would infiltrate into the cooling tower water system via rainwater, dust particulates and from air sucked into the system from the environment or released from thick biofilm mass and biofoulings. Such external factors are not within the control of HVS, hence it is not possible to ensure a 100% legionella-free cooling tower water system at all times in all corners of the cooling tower system. The overall water quality management is solely the responsibility of the legal owner of cooling towers.

In the event of positive legionella bacteria detection exceeding the threshold of 10 cfu/ml, remedial procedure is activated and disinfection of affected cooling tower with slug dosing of disinfectants in accordance with industrial practices and protocols at cost to be advised to the Owner. HVS responsibility is limited to such remedial steps and shall have no further responsibility for any further consequential loss and damages whatsoever and howsoever arising.

ATC SYSTEM

HVS-ECA System Technology

HVS Engineering has developed a proprietary pulsed technology electrochemical activation with the primary function in rapid de-scaling of the condenser tubes and electrolytically precipitating Calcium and Magnesium hardness ions from bulk water. it also has on-site disinfectants production to provide water sanitization and pH manipulation capability, which helps to reduce bio-growth and bacteria.

Utilising electro-chemical activation technology, HVS-ECA System infuses circulating water (open loop & close loop) with on-site generated powerful hypochlorites, strong oxidizing agents and a slew of oxidants to replace the conventional harsh and toxic chemical usage in water treatment. The free chlorine is electrode-process generated and is not a harsh industrial manufactured chemical which can be environmentally damaging both for the cooling tower system as well as when discharge to the sewage.

HVS-ECA System is a novel dual function electrochemical activation system that promotes rapid removal of calcium, magnesium, carbonate and silicate scale-forming ions physically and generates a slew of mixed oxidants on-site during the process of electrochemical activation of water to replace the traditional standard chemicals and oxidizing agents.

Operation of HVS-ECA System also results in free chlorine production (with disinfection properties) onsite. HVS-ECA System is principally for the purpose of removing scale-formation ions from the water within the cooling tower, thereby retarding as well as dissolving the existing scale deposits within the walls and pipes of the chiller system which enables a much more efficient chiller system and lowering the energy consumption. Removal of scale formation ions enables the cooling tower to run at a higher cycle of concentration without frequent blowdown compared to existing industry practices thereby enables more water savings in the range of 10% to 20%.