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  1. ksechler

    Primary-Secondary Loop vs. Primary only Loop (with VFD)

    All: First let me apologize if this has been addressed. I tried the search feature and didn't come up with anything so I figured I would just ask. I am working with an energy consultant to try to optimize the chiller plant at my facility which consists of 3 Trane 1500 ton chillers feeding a...
  2. ksechler

    Help with Differential Pressure Reference

    Ashereng and HVACctrl: Both of your replies were helpful, and are along the same lines I was thinking. The problem isn't so much conceptual. The header is intended to be a common reference for all of the DP's. The problem is the installation. This is a large scale multi-level manufacturing...
  3. ksechler

    Help with Differential Pressure Reference

    Actually, there really shouldn't be any flow in the header. That's why, theoretically, it should have a constant pressure. Of course, if it's leaking, then there's flow and a delta. At this point I'm getting pretty disgusted with it. I'm going to see if I can instrument it to take the header...
  4. ksechler

    Help with Differential Pressure Reference

    Ashereng: Actually we are seeing different pressures in different parts of the header. What causes that? My suspicion is that there is some leakage so air is flowing from higher pressure rooms to lower pressure rooms through the header. Obviously, this doesn't affect the room but it wreaks...
  5. ksechler

    Help with Differential Pressure Reference

    We are doing a startup of a new biotech facility. We are monitoring (but not controlling) differential pressure. This is done by installing a single DP instrument for each room of interest and referencing it back to a common header. Then interelationships can be figured arithmatically in the...
  6. ksechler

    Air make-up for lab area

    I have a room that our projects guys want to designate as an animal lab that I am concerned about. Right now it is slated to be cooled with a 3-ton split system with 100% recirc. I know recirc is no good so how much outside air is required? I have found a Guide for the Care and Use of...
  7. ksechler

    Opinions on Triple Duty Valves

    We are using 14" Triple Duty Valves on our condenser water system. There are three pumps and generally we use one with run times rotated to even wear. I noticed during commissioning that there was an excessive pressure drop across the triple duty valve when it was all the way open. The actual...
  8. ksechler

    Cost of water

    Anybody have an idea of water the cost of soft water vs. domestic water is? I need a benchmark figure to perform a cost benefit analysis of reclaiming chilled soft water vs. dumping it down the drain.
  9. ksechler

    Pipe cost per linear foot

    I'm trying to do some budgeting for next year and need to know what the cost per linear foot of the following is: 3" sch 40 steel 1.5" sch 40 steel 1.5" type L copper 3/4" type L copper Can anyone help me with a rough number or provide a resource that would provide a statistical model? Thanks!

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