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  1. lurch17

    Atmospheric expansion tank

    Am a mechanical engineer specializing in large chilled and condenser water cooled AC systems in high rises. I have seen them, but for the life of me cannot find a manufacturer of an open atmospheric expansion tank or reservoir with float-valve for placement at the top of a large system. I have...
  2. lurch17

    Water valve noise

    Thanks for the valuable info folks - I understand the causes much better and now think I am on a solution path. Will post more details when I have the solution (or not).
  3. lurch17

    Designing Water Cooled Chiller w/ Heat Recovery

    I do this all the time in Hawaii by building up a hybrid heat-pump/chiller combination. They work great. I have not ever found an off-the-shelf York/carrier/trane that does a satisfactory job - the machine must be sized and designed for the chilled/hot water load. If water is cheap use an...
  4. lurch17

    Maintaining Minimim Chiller Flow using a Cla-Val

    I always eliminate ClaValves. They are hard to adjust and keep repeatable. There are too many unknown variables here to respond with precision so I will shoot anyway. Determine which units run the most until you get around 120 GpM worth. Outfit each of those with a correctly sized Hays...
  5. lurch17

    Typical CHW heat gain in distribution loop

    I have measured a couple of high-rise condo chilled water systems with typical fiberglass or composite insulation and found negligible loss, less than 1/2 Deg F from the chiller outlet to the end of the supply riser 400 feet above. Usually, if you have significant parasitic losses through the...
  6. lurch17

    Pumps in Parallel

    No problem Remp, as long as both pumps are actually pumping at all system operating points - I do it all the time with pumps in the 20 to 75 HP range. One system I designed has a 10Hp, 20HP, and 40HP in parallel - works great. Some considerations: Each pump's motor must handle the pump over...
  7. lurch17

    Water valve noise

    Suffering extreme noise when closing a 2" ball valve in clean water - 12 psi differential and approximately 15 psig static at the valve inlet. Crazy, it only make noise closing, not opening. So I replaced it with another brand of ball valve (Griswold Soft-touch) - no difference! The flow is...

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