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  1. #1
    Join Date
    May 2008
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    Japan
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    Air Handling Unit(AHU) Efficiency


    We use an Air Handling Unit(AHU) to supply heating & cooling to our office. The current temperature/humidity setting of the unit is 22degrees/50%RH.

    I would like to increase the temperature to 27/28 degrees with reduction of chilled water usage in mind which would result in reduction of costs.

    What I am trying to find out is: If the Temperature is increased to 27/28 degrees, will the AHU be running efficiently trying to maintain the relative humidity at 50%RH or will power usage be increased for this setting. (For this example take the outside temperature to be at 25 degrees)

    Any advice on this would be much appreciated.



  2. #2
    Join Date
    Aug 2007
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    Russia
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    Re: Air Handling Unit(AHU) Efficiency

    What method of the humidification do you use?

  3. #3
    Join Date
    Feb 2007
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    SIDE OF THE ROAD
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    Re: Air Handling Unit(AHU) Efficiency

    hi,

    a good ddc engineer is what you need, check if you are controlling off the return air or local stat watch out for solar gain on the florrs!!! check if your entalpy control,mixing box etc.. are all in order...if you are increasing setpoint i would raise chilled water set point and look to decreasing fan when dehum required and dew point for 26/27 degrees

    rgrds phil

  4. #4
    Join Date
    Oct 2001
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    Nottingham UK
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    Re: Air Handling Unit(AHU) Efficiency

    With an outdoor temperature of 25 and an indoor target temperature of 27/28 you don't need chilled water cooling, you need heating!
    I'm back on the Pale

  5. #5
    Join Date
    Feb 2007
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    Bedford
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    Re: Air Handling Unit(AHU) Efficiency

    Temperature and humidity are in relationship higher the temperature the lower the humidity.

    Freecool

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