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Thread: indoor farming

  1. #1
    Join Date
    Nov 2006
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    california
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    indoor farming

    the requirement i was told is a 5 ton ac system. assuming that the grower did all the calculations and this room need a 5 ton ac system. cool=68-70, humidity 60 or less. i wanted to set it up as walking cooler styler so i try 2 9000btu walking evaporator coils with a 5 ton condenser, btw running r-407a. temper was easily achieve but my humidity is at 71 which too much. thermostat set at 68 when it is on cool the humidity drop to 71, when cooling is off, humidity goes up to 86.
    what can i do to lower the humidity? i thought about increasing the size of the coil but the would increase the cost. its cheaper to use a 5 ton air handler. anyone done this way?

  2. #2
    Join Date
    Sep 2007
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    edmonds wa
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    Why would money be an issue on a commodity like that. Ruin a crop because of mold and you paid for the correct system many times over.
    UA Local 32

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  4. #3
    Join Date
    Mar 2013
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    It sounds like you're oversized for at least this time of the year.

    Since you've already got the equipment in place, I would TEE the common suction line downstream of the evaporators, with one line having a suction stop solenoid and the other having an EPR valve.

    The suction stop will be open with a call for cooling from the thermostat. You'll also need a dehumidistat to control the LL solenoid (which will no longer be controlled by the thermostat)

    you'll need to play with the EPR to dial in the pressure setting that dehumidifies without over cooling the space, but I believe you can be 100 percent successful.

    Sent from my SCH-I545 using Tapatalk

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  6. #4
    Join Date
    Sep 2003
    Location
    WV
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    indoor farming

    It sounds like you need a stand alone dehumidifer

  7. #5
    Join Date
    Jan 2010
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    It sounds like someones calculations are WRONG.

  8. #6
    Join Date
    Mar 2013
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    Port St. Lucie, Fl
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    Quote Originally Posted by VTP99 View Post
    It sounds like someones calculations are WRONG.
    Keep in mind, it's January and not design conditions. He has temperature AND humidity requirements that simply can't be achieved by ANY single-staged equipment

    Sent from my SCH-I545 using Tapatalk

  9. #7
    Join Date
    Dec 2016
    Location
    Central Ohio
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    Check into their watering practices too... You have a terrarium there.

    Might install a portable dehumidifier to get the humidity down first and then see what happens to maintain.
    What about ventilation?


    Sent from my SM-N915T using Tapatalk

  10. #8
    Join Date
    Sep 2007
    Location
    edmonds wa
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    Or a home built econo setup.
    UA Local 32

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