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Thread: indoor farming

  1. #1
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    Nov 2006
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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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    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

  3. Likes VTP99, 4jime, kdean1 liked this post
  4. #3
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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
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    indoor farming

    It sounds like you need a stand alone dehumidifer

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  8. #5
    Join Date
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    It sounds like someones calculations are WRONG.

  9. #6
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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

  10. #7
    Join Date
    Dec 2016
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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

  11. #8
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    Sep 2007
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    Or a home built econo setup.
    UA Local 32

  12. #9
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    Jan 2017
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    I agree with buford!

  13. #10
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    I have a 2-stg 16 SEER HP with a VS AH and dehumidification tstat for drying my honey in July/Aug. It can maintain 40-45% rh in our humid climate.

  14. #11
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    Quote Originally Posted by RV10flyer View Post
    I have a 2-stg 16 SEER HP with a VS AH and dehumidification tstat for drying my honey in July/Aug. It can maintain 40-45% rh in our humid climate.
    Yep. But you are not constantly watering the honey at the same time.

    Sent from my SM-N915T using Tapatalk

  15. #12
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    Jan 2017
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    Quote Originally Posted by Sailfast View Post
    Yep. But you are not constantly watering the honey at the same time.

    Sent from my SM-N915T using Tapatalk
    I also grow plants in my shop earlier in the year and use a dehumidifier in addition to the hp. Set the 2nd stg cfm to 300/ton.

  16. #13
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    Jan 2015
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    In my expirience it's always best to use a separate dehumidifier along with a separate AC system to keep the room cool. I've never once seen a room that was properly cooled and dehumidified perfectly of of one appliance. Remember that if you don't maintain the humidity below 55% you'll get fungus.

  17. Likes HeatenCoolair, RV10flyer liked this post
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