top of page

Background

Cooling towers are vital components in building air conditioning systems, offering greater energy efficiency than air-cooled condensers. However, Singapore's hot and humid climate fosters algae growth in these systems, often leading to microbial-induced corrosion beneath deposits. This not only results in increased Condenser Approach Temperature (CAT)—a key fouling indicator—but also forces chillers to expend more energy to maintain the required chilled water supply.

Challenges Presented

During a trial at a local university's largest cooling tower system, which operates continuously at a capacity of approximately 6,000 RT, the estate management outlined four critical challenges:

  • Improve algae control compared to current methods.

  • Match or exceed existing corrosion control measures.

  • Achieve water savings of at least 60 m³/d, totaling 21,900 m³/year.

  • Maintain CAT at the same level or with minimal increases.

Results Achieved

The outcomes of the trial were significantly positive:

  • Algae Control: Algae growth was substantially reduced, with no algae present on the fill. This led to shorter washing intervals and extended fill lifespan.

  • Corrosion Control: The corrosion rate for mild steel decreased dramatically from 12.36 mpy to 1.93 mpy, prolonging the life of condenser piping and chillers.

  • Water Savings: Actual water savings reached approximately 26,000 m³/year, surpassing the projected savings of 21,900 m³/year.

  • CAT Maintenance: CAT remained stable at around 0 to 0.2°C since treatment commenced in January 2017, ensuring no additional operational costs due to fouling and maintaining consistent electrical consumption.

This successful intervention demonstrates our commitment to enhancing cooling tower performance, improving energy efficiency, and promoting sustainability in water management

bottom of page