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  1. #14
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    9,671
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    Quote Originally Posted by 71CHOPS View Post
    a simple measurement of DB delta is meaningless!

    if you truly want to begin to understand the liquid we call air, get Psychrometrics without tears, by Eugene Silberstein, and read read read! it's a good, basic introduction to air. if you want to learn more, there's a whole other world of AC out there!
    Amen!!
    Regards Teddy Bear
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  2. #15
    Join Date
    Apr 2003
    Location
    St. Louis
    Posts
    1,269
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    Quote Originally Posted by 71CHOPS View Post
    a simple measurement of DB delta is meaningless!

    if you truly want to begin to understand the liquid we call air, get Psychrometrics without tears, by Eugene Silberstein, and read read read! it's a good, basic introduction to air. if you want to learn more, there's a whole other world of AC out there!
    So get your degree as a mechanical engineer i had the privilege of working with one that ran service. Took him 9 years of night school from washington university saint louis. As a serviceman if you don't get your butt kicked at least once or twice a year your not doing your job. In 40 years only needed wet bulb temp only a few times. It's so amazing that with a good set of test equipment and now a laptop with the correct program and cables what can be fixed.

  3. #16
    Join Date
    Apr 2007
    Location
    Tucson, Arizona
    Posts
    1,280
    Post Likes
    If the home you are dealing with is in Tucson, AZ. The A/C is probably set up for the majority of the year, as a desert system. This year in particular has been an unusual monsoon. High humidity with little rain, normally we get the rain to cool everything off also, this year not so much. The systems I design are running 450-500 cfm per ton, which works great for most of the year. Adding a dehumidification feature to the system which runs a much lower blower speed (325-350 cfm per ton) will wring the moisture out of the air during the monsoon season. Did the system you’re working on develop problems mid July? For any of you not familiar with a monsoon season, it’s where you get more than half your annual rainfall in about a month.
    There are two ways to do things, Right and Again.

  4. #17
    Join Date
    Jul 2011
    Location
    Tucson, AZ
    Posts
    177
    Post Likes
    Thread Starter
    It's not a house. 2 circuit York RTU in a supermarket kitchen. The big MUA was running dry, dumping 110* air into the kitchen. Since the water was turned on for it, the kitchen has been at 72*. The evaporator was recently replaced by another tech and I found air gaps around the coil. The saturation temps were 50/110 R410a with 7* SC and 20* compressor SH on each circuit. I was just curious if humidity can reduce a split that greatly. Punching numbers into the check and charge app appears to say yes. I do not have static pressure readings. There have been no further complaints since water was turned on to the MUA unit. Yes Tucson AZ.

  5. #18
    Join Date
    Apr 2003
    Location
    St. Louis
    Posts
    1,269
    Post Likes
    Quote Originally Posted by 71CHOPS View Post
    a simple measurement of DB delta is meaningless!

    if you truly want to begin to understand the liquid we call air, get Psychrometrics without tears, by Eugene Silberstein, and read read read! it's a good, basic introduction to air. if you want to learn more, there's a whole other world of AC out there!
    So tell me exactly where in a system your going take your wb temp on a built up system since right off the coil face is 100% RH. If coil temp is 40* how much more can you do equipment wise. I'm going to look at the building envelop and operation.
    Last edited by servicefitter; 08-18-2019 at 07:11 PM.

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