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Thread: Efficient Duct Design? I have concerns

  1. #81
    Poodle Head Mikey's Avatar
    Poodle Head Mikey is offline Membership Chair/ARP Committee / Professional Member*
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    It is never too soon to begin making things better.


    Quote Originally Posted by Jimmy111 View Post
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  3. #82
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    Quote Originally Posted by Scoobie View Post
    Id say you cant make the coil to big, within reason. But you can move to much air through a coil. Humidity control is all about how cold you get the air leaving the coil. And thats all about how much air per ton.
    Dan, what do you dislike about this post? Just curious.

  4. #83
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    Efficient Duct Design? I have concerns

    Even at 800 cfm with a 2t outdoor and 5t indoor your not going to dehu any better I reckon.

    Unless your going to run your sst at 35*

    There is so much surface area to that coil that your sst will likely be just a few degrees shy of DAT.

    Again looking at the super high seer units, they have massive indoor coils and higher SST when charged to the proper subcooling.

    Look at the coils from the 70S they were tiny but ran a low sst. Today we find them in the 50* range.

    Maybe Ill get a hair up my behind and hook up to my unit. 16seer 3 t with 4 or 5t coil cant remember at the moment


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  6. #84
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    Quote Originally Posted by Scoobie View Post

    Dan, what do you dislike about this post?

    Just curious.
    Follow the HVAC DESIGN PROCESS _ FIGURE 3

    Adhere to
    Building Codes ___ Extended Performance Data SHALL BE USED,
    ACCA Guidance,
    AHRI Selections.

    Use vendor selection software
    _____ after an accurate Manual J calculation is verified.
    Designer Dan __ It's Not Rocket Science, But It is SCIENCE with Some Art. _ _ KEEP IT SIMPLE & SINCERE ___ __ www.mysimplifiedhvac.com ___ __ Define the Building Envelope & Perform a Detailed Load Calc: It's ALL About Windows & Make-up Air Requirements. Know Your Equipment Capabilities

  7. #85
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    Quote Originally Posted by dan sw fl View Post
    Follow the HVAC DESIGN PROCESS _ FIGURE 3

    Adhere to
    Building Codes ___ Extended Performance Data SHALL BE USED,
    ACCA Guidance,
    AHRI Selections.

    Use vendor selection software
    _____ after an accurate Manual J calculation is verified.

    I was thinking more like an Aaon unit. A nominal 10 ton unit might have 1500cfm of air cooling it down to 48 deg or so. It still works okay. I was not suggesting mismatching stuff.

  8. #86
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    Interesting read.

    Been going over some of my old load calcs from 20 years ago. Boy, it really is a garbage in, garbage out method. In the last couple of decades I have learned that you need a balance between load calc, duct sizes, experience, and good old common sense.

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