As facility managers are seeing an increase in responsibilities and tasks while navigating the global pandemic, Goodway Technologies wants to share a reminder that proper chiller maintenance and cleaning should still be a priority on their to-do lists.
A benefit of performing chiller cleaning and maintenance at the end of the cooling season is that any larger issues or concerns can be identified early. It provides more time to find a solution before the chiller will be back up and running.
“Facilities will see many benefits from properly cleaning the chiller system, with one of the largest being avoiding any unnecessary expenses from repairs or additional operating expenses,” said Tim Kane, president of Goodway Technologies. “Increased efficiency is a close second, and with many buildings and facilities having an eye on their costs, it’s more important than ever to clean large HVAC systems like chillers.”
Since chillers are one of the largest operational expenses for a facility’s HVAC system, deferred maintenance can lead to increased energy expenses due to inefficient operation, as well as further costs associated with additional repair and lost production time. After maintenance, it’s a good idea to measure efficiency gains, which can show facility managers important information, including costs saved as a result of regular maintenance. A proper operating log is vital to help identify areas that show improvement following chiller maintenance.
Four Steps To Improve Chiller Performance
Goodway recommends four steps to help ensure your chiller system sees optimal performance:
Step 1: Maintain a Daily Operating Log – The Federal Energy Management Program (FEMP) recommends updating the log four times a day to monitor key operating parameters that will help indicate if any problems are developing. If four times is too much, make sure it’s at least once a day. The data it shows you will be invaluable.
Step 2: Keep Tubes Clean – Fouling and scale can reduce efficiency. Goodway offers a chiller fouling calculator to estimate how much money is being expended due to the presence of scale in chillers. For example, a 500-ton chiller with a moderate amount of scale deposit (0.012”) can cost an additional $7,020. Regular monitoring can help recognize when cleaning should take place, however it is recommended at least once a year. Pressure loss can also indicate tube corrosion. Goodway has a selection of chemical descaling solutions, mechanical tube cleaning solutions and expert consulting services to find the proper cleaning approach.
Step 3: Ensure a Leak-Free Unit – Leaks can affect the efficiency and operation of the system while releasing hazardous refrigerants. Refrigerant levels should stay within the manufacturer’s recommended levels. An air-purge timer (increases in air-purge time may indicate a leak), checking the refrigerant sight-glass for bubbles and checking at all joints and connections with a gas analyzer are all ways to help track refrigerant levels.
Step 4: Sustain Proper Water Treatment – Between cleanings, it is important to implement a water treatment program. Water treatment helps to reduce – but not fully eliminate the buildup of contaminants on heat-transfer surfaces that can lead to loss of efficiency and also lead to the growth of harmful bacteria. Each facility is different, so it is important to speak with an expert resource to identify a proper water treatment program.
Don’t Forget About The Cooling Towers
If your chiller system has a cooling tower, keep in mind that the cooling tower can have a big impact on efficiency. It also poses a potential health risk if not maintained. When ignored, the warm water in cooling towers can promote algae growth, and flash evaporation can produce hard scale deposits or calcium fouling. Cooling tower fill acts like a massive air scrubber, coming into contact with dust, pollen and insects, which contribute to bacteria growth. This creates a breeding ground for bacteria such as Legionella. Like chillers, regularly cleaning cooling towers can decrease the chances of equipment corrosion or breakdowns and can increase plant efficiency.
Want to read more about facility management and HVAC?
Check out all the recent HVAC Factor columns from Facility Executive magazine.