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  1. Replies
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    Not quite the correct description but close...

    Not quite the correct description but close enough. The portion of air contacting the coil, if it's dropping moisture, must be below its own dewpoint and therefore at 100% RH. Assuming perfect...
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    I hope so, I've had mine in a lot of ducts.

    I hope so, I've had mine in a lot of ducts.
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    It might be easier to just remove BF from the...

    It might be easier to just remove BF from the output screen. What is your average tech going to do with it anyway?
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    Yep.

    Yep.
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    Yes and yes.

    Yes and yes.
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    On Brent's Trane belt driven unit I calculated an...

    On Brent's Trane belt driven unit I calculated an ADP of 46.7. His return air temp was 70-ish. SST was probably what? 40 tops? FWIW I had to use an ADP of 34 to get a BF of 0.56 out of his air...
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    SST is lower than ADP. That seems to be the part...

    SST is lower than ADP. That seems to be the part you're missing. The difference ADP(coil surface temp) - SST (refrigerant saturation temp) can vary from 0 to probably 15, I don't really know the...
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    It's a mixed air problem and as such BF and ADP...

    It's a mixed air problem and as such BF and ADP are well defined numbers, and there are exact formulas available, not approximations. The exact formulas aren't that complicated, so you might as well...
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    They'd run me off by the end of the first day! :)

    They'd run me off by the end of the first day! :)
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    You can't use the evaporator saturation temp to...

    You can't use the evaporator saturation temp to get the ADP. You shouldn't believe something just because it's found in a Manual. ;)

    I've seen that done too, but that didn't make it right on...
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    I meant to get back to the BF issue sooner, but...

    I meant to get back to the BF issue sooner, but I've been busy. OK, on the Infinity system calc, Brent got a BF of 0.44. Using the same psychometric data I got a BF of 0.23, which is more inline with...
  12. Yep, I was thinking the same thing. The old...

    Yep, I was thinking the same thing. The old system may have had a dominant return duct leak pressurizing the house. That would not only explain the change in house behavior, but also the headaches...
  13. The only way for RH to rise as the unit runs is...

    The only way for RH to rise as the unit runs is for the unit to be performing essentially no dehumidification at all. In your example of RH dropping with rising temp the dewpoint was held constant,...
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    You forgot the incantation part.

    You forgot the incantation part.
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    Altitude can be found directly by GPS. It isn't...

    Altitude can be found directly by GPS. It isn't an estimation, it's a measurement. The pressure calculated from that altitude is however just an estimate, being the average pressure at that altitude....
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    Hilton Head...

    Hilton Head
    http://www.wunderground.com/history/airport/KHXD/2014/8/11/DailyHistory.html?req_city=NA&req_state=NA&req_statename=NA

    Same result though.

    FWIW, 14.961 converts to 30.46" hg,...
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    Thanks, you must have posted before reading...

    Thanks, you must have posted before reading mason's barometric report.
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    It's up to you how you go about it, I'm not sure...

    It's up to you how you go about it, I'm not sure it matters that much in the grand scheme of things. The pressure at the blower inlet is going to be different than the ambient pressure near the...
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    So the same or less than it is right now. OK, in...

    So the same or less than it is right now. OK, in defense of the tool, high accuracy barometers cost high dollars. We'll have to accept some error in order to keep the tool cost down to a reasonable...
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    The barometer in Savannah is 1018.2 at this...

    The barometer in Savannah is 1018.2 at this moment, the highest it has been over the last 7 days. The reading on the app was the equivalent of 1031, quite a bit higher. The all time record high in...
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    Yes of course, but normal variations from the...

    Yes of course, but normal variations from the standard just aren't that high. Maybe the pressure was close to being that high, I don't have barometric records for that area so I guess I'll have to...
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    If you weren't on a submarine the calc is way...

    If you weren't on a submarine the calc is way off. It's immaterial that you were on a beach. I'm at about 350 ft here, about 500 miles inland, and the manifold would have put me below sea level too....
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    Let us continue with some OT content. OK, I see...

    Let us continue with some OT content.
    OK, I see the problem with the SCFM calculation. The barometric pressure on the iManifold app screenshot is reading 14.961 psia at 0 ft altitude. The pressure...
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    Technically you're correct, but that wasn't done...

    Technically you're correct, but that wasn't done so my apologies. In hindsight I might have requested that the thread be split into two. I was the one who actually requested the edit after talking to...
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    Did you measure return static? Did you find out...

    Did you measure return static? Did you find out what was blocking the coil? Is there an air filter in the bottom of the air handler?
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