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GSA OUTBRIEF 22
Continuous Monitoring and Partial Water Softening for Cooling Tower Water Treatment
If you missed our last webinar, “Continuous Monitoring and Partial Water Softening for Cooling Tower Water Treatment,” you can find a recording of it, and presentation slides below.
Many thanks to all the presenters and to the participants for their thoughtful questions, a few of which are answered here:
Q: $16.76/kgal seems high for the average GSA water rate. Do you have a sense of at what price point, AWT would make sense?
A: Water rates are the fastest rising utility cost for GSA. Since 2007, GSA water rates have increased by 137%. $16.76/kgal is the current weighted average. To calculate testbed payback with different water rates, refer to this summary table in the slide deck.
Q: Were there energy savings due to better heat transfer?
A: While energy savings are likely if scale is reduced, energy savings were not measured as part of this evaluation. Some AWT systems previously evaluated by GPG have been shown to reduce scale build-up. This technology limits scaling factors through partial-softening, and if scaling conditions are present, an alarm is generated, so the anti-scale chemical dosage can be checked or changed.
Q: Of the five systems that GPG has evaluated to date, which ones offer online monitoring?
A: Only one of the systems, Continuous Monitoring and Partial Water Softening has built-in monitoring that can be connected to a BAS. However, two of the systems, Salt-Based Ion Exchange and Chemical Scale Inhibition, use a common multifunctional water treatment controller that can be connected to a BAS. (This controller can also be used with other AWT systems.) None of the systems have been cleared by GSA for remote monitoring.
Webinar Links
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