Tower Inspections, Evaporation & Fan Speed

Sponsored by

• The following are questions and answers submitted to the “Ask the Expert” column at the Cooling Water Institute's CTI Journal — used by permission here:

Q: How often do we need to inspect cooling towers and what do we use as a code reference?

A: CTI has recommendations associated with maintenance of cooling towers. Please see our website for referenced standards. The institute has specific recommendations for control of Legionella, so please download the “Legionella Paper” for more details.

Q: I need a paper that compares water evaporation levels based on the fan speed. It must focus on how a user can reduce the water cost of Mechanical Draft Cooling Towers by use of motors with frequency changer or adjustable speed drivers.

A: A quick calculation can be made by assuming that the factor is equal to 0.1% or .001. This assumes the correct Liquid to Air Ratio so air leaving the cooling tower has reached saturation and has risen to approximate the inlet water temperature. The change in air flow will reduce the amount of air so the amount of heat removed will be directly proportional to air flow. The evaporation factor will drop proportionally. A 50% reduction in air flow will reduce evaporation by a factor of 50%.

Q: Do you have any guidelines or practical applications for smoke/fire detection in wooden cooling towers?

A: There have been two technical papers on fire protection that have been given at CTI that you may want to purchase, specifically TP62-07 “Fire Protection of Water Cooling Towers” and TP71-03 “Fire Protection and Cooling Towers” which are available at www.cti.org/tech_papers.html.

Q: Why is ammonia not used in residential applications as a refrigerant, but so prevalent in industrial applications?

A: Ammonia is a very toxic gas. It's not used in residential applications because of potential for leakage into homes. Industrial complexes use ammonia refrigeration but under very stringent monitoring requirements. In reality, the typical homeowner would be at great risk from gaseous ammonia vs. standard refrigerant. The liability to the HVAC industry would be huge.


Cooling FAQs are provided by the Houston-based Cooling Technology Institute (CTI), a non-profit organization dedicated to improvement in technology, design, performance and maintenance of cooling towers and evaporative heat transfer systems (EHTS). They're from the “Ask the Expert” column of CTI Journal. Contact: 281-583-4087 or www.cti.org

Sponsored by

TODAY'S HEADLINES

VIDEO: Desalination global news round-up

Join WWi Chief Editor Tom Freyberg for a round-up of the latest desalination industry news from the last two weeks. Watch the video for the full stories…

Maryland WWTP's new solar array to serve as state's largest municipally-owned system

Standard Solar is set to install a 2.1-megawatt ground-mount solar system in Pocomoke City, Md., at the city's wastewater treatment facility. Once completed this December, it will be the largest municipally-owned system in the state.

Major Texas company to pay $1.6M civil penalty for CWA oil spill violations

The Department of Justice and the EPA have announced that Superior Crude Gathering has agreed to pay a civil penalty for alleged violations of the Clean Water Act stemming from a crude oil spill in 2010 from tanks at the company's oil storage facility in the town of Ingleside, Texas.

Bureau of Reclamation makes WaterSMART grants available to improve water, energy conservation

The Bureau of Reclamation is inviting states, tribes, water and irrigation districts, and other water- and power-related organizations to apply for funding to cost-share on projects that conserve and use water more efficiently, increase renewable energy use and improve energy efficiency.

FOLLOW US ON SOCIAL MEDIA