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My client is using 4 positive displacement blowers with timer control in his wastewater treatment plant to provide oxygen to the process. Recently, he proposed to install VFD on these blowers to control the amount of air flow and reduce energy consumption. Since the blowers are supplying...

I am wondering if there are any relationships to descript pump motor Amp and actual pump flow. That is by measuring the pump motor Amp to eatimate the actual pump flow. Thanks!!

Hi there, I'm asked to work on a spreadsheet to calculate the savings on AC night setback during summer. What would be the best method I should use instead of "1% savings per 1F setback". Thanks in advance.

Hi, I would like to determine the new AHU supply fan speed by assuming the duct static pressure drop from 1.5" to 0.75". What equation I should use for a rough estimation? Thanks.

Currently, I’ve 100 4-lamps T8 fixture in our facility and given out very high footcandle. So I want to reduce the number of T8 lamp per fixture from 4-lamp to 3-lamp. In general, do I need to shop for new ballast if I do that? Thanks!!

Hi there, I'm evaluating the power consumption of a compressor. What I have on hand is only the logged Amp data from the machine. Are there any way that I can find out its p.f from the amp data so that I can get its power consumption? Thank you very much.

Hi all, Is that possible to apply VFD on 600HP centrifugal air comrpessor? It is 460V and using inlet and bypass valves as the control. Also, what would be the other methods to control and saving energy? Thanks in advance.

Hi, I'd like to know if any of you have experience on improving electricity usage in rotational molding industries? It is because I couldn't see a lot of electricity consumption on the molding process, the only big consumption I could see is the rotational arm of the mold. Please let me know if...

Hi all, I'd like to know if a motor installed VFD would improve or lower the power factor, and why? Thanks!!

What're the advantages or disadvantages to add filters in cooling towers? And why some cooling towers have no filters?

Can I use bottom or fly ash from the coal fire power plant to soften the cooling tower water in order to run high cycles of concentration and lower the cost of dispersant?

Hi there, I was just wondering if I need other chemicals such as: 1. calcium carbonate deposition control, calcium phosphate deposition control and mud/silt dispersion 2. carbon steel corrosion inhibition 3. bio-dispersant and oil/grease dispersant 4. dechlorination if I'm going to use either...

We are in the stage of deciding what biocide to use for our new cooling tower in the power plant. The rate of water is around 60,000GPM, and we are using groundwater and discharge directly to the river close by. Also, does any of you know this kind of device/treatment method...