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  1. #27
    Join Date
    May 2004
    Location
    Los Angeles, CA
    Posts
    1,560

    Thank You.......

    Dear Jayguy,

    Sorry my fingers got ahead of my brain, my statement should have read:

    “Circuits with resistance loads only do not have any induction and capacitance influencing their PF, therefore their PF would remain at 1.0.”

    Thank you for your gentle correction my friend…………….

    Respectfully Submitted,
    John J. Dalton CM

  2. #28
    Join Date
    May 2004
    Location
    Los Angeles, CA
    Posts
    1,560
    Dear HVACR Man,

    Well, let’s see what we can find my friend. Let’s start with the basic formula:

    BTU/Hr = CFM x Delta T x 1.08

    You have furnished two, of the three values needed to use this formula, namely the 10 kw and the 1227 CFM. Let’s use the formula to determine the Delta T. First we have to manipulate the formula as follows:

    BTU/Hr / CFM x 1.08 = Delta T

    Then we have to convert our kw to BTU like this:

    10kw x 3.41 BTU/Hr/watt = 34,100 BTU/Hr.

    Next we’ll plug our BTU rating into our manipulated formula like so:

    34,100 BTU/Hr / 1227 CFM x 1.08 = 25.7 degrees F

    Does this help???????????

    Respectfully Submitted,
    John J. Dalton CM

  3. #29
    Join Date
    Nov 2006
    Location
    Iowa
    Posts
    86
    John
    I see what i am doing wrong. I forgot the order in which you need to multiple and divide the equation. is there a book out there that has all of these and other formulas that would aid a guy in the hvac world?? I cant remember them because i dont use them enough.
    thanks
    Bring back rotary phones so we dont have to press 1 to proceed in ENGLISH!!!!

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