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It is never too soon to begin making things better.
Originally Posted by
Jimmy111
Why would it make it the perfect time??
PHM
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The conventional view serves to protect us from the painful job of Thinking
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Post Likes - 2 Likes, 0 Dislikes
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Originally Posted by
Scoobie
I’d say you can’t 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 that’s all about how much air per ton.
Dan, what do you dislike about this post? Just curious.
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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 70’S they were tiny but ran a low sst. Today we find them in the 50* range.
Maybe I’ll get a hair up my behind and hook up to my unit. 16seer 3 t with 4 or 5t coil can’t remember at the moment
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Originally Posted by
Scoobie
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
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Originally Posted by
dan sw fl
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. 
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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.
Membership Chair/ARP Committee / Professional Member*
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