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  1. #1
    Join Date
    May 2019
    Posts
    1
    Post Likes

    No Cooling From Chilled Water System

    Dear Experts,

    We have a running district cooling system with plate heat exchangers just commissioned.

    Primary Side Water In Temp- 5 C
    Primary Side Water Out Temp - 8 C
    water Flow : 230 GPM
    Pumps running at Discharge: 6 Bars
    Suction : 4 Bars
    Design Pump Head is 100 feet at 185 gpm

    At Pumps Running Condition- Condensation observed in Main Chilled water supply and return headers when exposed to atm. However, we are not able to observe cooling at FCUs and AHU. Please advise.

    Also please let me know the operating pressures for pumps as no design data is given except that max operating pressure of 10 bars (calculated FLow is 185 gpm at 100 feet head). Moreover, expansion tanks are not pressurized ( what should be the pressure at Expansion tanks?)

    Thanks!

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    21,488
    Post Likes
    Quote Originally Posted by Mohammed53 View Post
    Dear Experts,

    We have a running district cooling system with plate heat exchangers just commissioned.

    Primary Side Water In Temp- 5 C 41°F
    Primary Side Water Out Temp - 8 C 46°F
    water Flow : 230 GPM
    Pumps running at Discharge: 6 Bars 87#'s
    Suction : 4 Bars 58#'s
    Design Pump Head is 100 feet at 185 gpm

    At Pumps Running Condition- Condensation observed in Main Chilled water supply and return headers when exposed to atm. However, we are not able to observe cooling at FCUs and AHU. Please advise.

    Also please let me know the operating pressures for pumps as no design data is given except that max operating pressure of 10 bars (145#'s) (calculated FLow is 185 gpm at 100 feet head). Moreover, expansion tanks are not pressurized ( what should be the pressure at Expansion tanks?)

    Thanks!
    Converted!

  3. #3
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    21,488
    Post Likes
    From here it looks like the pumps aren't moving water.

    Any readings of normal operating pressures?

  4. #4
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
    Posts
    3,446
    Post Likes
    Expansion tanks not pressurized. They should have a positive pressure on them. I would start with the water make-up station. Verify proper operation of it.
    In honor of RichardL: "Ain't 'None' of us as smart as 'All' of us".

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