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  • Users: malz
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  1. malz

    Positive Pressure - How much is enough

    I maintain between 1' & 1.25 ' static in my facility & have no problems. All of my older static operated devices need at least 1" to function normally. Anything below an inch is trouble around here.
  2. malz

    Fuel pump noise

    Message to butelja: Please provide details regarding the quarterwavelength resonator. Is this an elecrically powered device? Where would one install it for greatest impact? The name indicates it limits frequency resonance, but we have no indication as to how this is accomplished. Would this be a...
  3. malz

    Fuel pump noise

    I will pose this suggestion to my team. Thank you very much.
  4. malz

    Fuel pump noise

    We have contracted a vendor, who will install a VFD module on the pump set in question temporarily, to see if this is a feasable idea. I will post result after testing (if interested.)
  5. malz

    Ventilation Blowers in Series

    It really depends on exactly how the fans are set up: Is the booster fan before the other 2 or after, and what are the respective sizes? Does blower 3 have any means of varying air volume (ie. axial vane pitch mechanism, etc.), or is it a straight shot centrifugal unit? Any changes to speeds of...
  6. malz

    Fuel pump noise

    The motor connection is greenfield, so it is flexible. My feeling about the rubber boots around the anchors (sound attenuation on the pipe riser) probably does not exist, & I think this is the problem. I have my doubts about a VFD, although it may work. I just think I am missing something...
  7. malz

    Variable flow vs. Constant flow through centrifugal chillers

    I use a Chilled water pump on VFD, to augment my chilled water system, and it seems to work pretty well. Over the years, systemic changes to the building have seen an increase of fan coil unit use (they are practically everywhere!), and this was putting our system out of specification (at some...
  8. malz

    Fuel pump noise

    I work in an office building, where we have a 2000KW power plant on the roof. The fuel pumps and cells are in the basement. Pumps are of a positive displacement variety. For a long time, whenever the pump set is on, one can walk literally anywhere in the building and hear the "whine&quot...
  9. malz

    Watts to BTU calculation

    Thanks!!
  10. malz

    open / closed transition

    Can someone give me the definition of an open transition or a closed transition in an office building high voltage application? If you can, thanks!
  11. malz

    Watts to BTU calculation

    Looking for the calculation which converts watts per sqare foot, to BTU then to refrigeration tonnage. Any help would appreciated.

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