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  1. #1
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    calculating the kw's my unit is doing.



    hey everyone I need help calcualating how my kw's of refrigeration the new pakage unit I just installed is doing. The tradesman I work with has set it as my home work but I have lost one of my main tafe books and cant find any formulas. Can anyone please help me. All im after is the formula so I can work it out on my own. But we had 19.2 air on the coil 27.7 air off the coil with an air flow rate of 2350L/s. on heating of course. Sorry if this is in the wrong section im a newbie. Thanks for all your help
    chris.



  2. #2
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    Re: calculating the kw's my unit is doing.

    I have yet to know this forum policy about homework questions. Most of the professional forums on the net either don't allow it or have separate forums. Till the time I know it, here is the formula for you.

    Take pains to remember this forever if you continue to be in HVAC. The sensible heat can be calculated by Q = 1.1xcfmxdT, where Q is rate of heat flow in btu/hr, dT is temperature difference in F.

    Go and get an excellent and free unit conversion software called Uconeer from www.katmarsoftware.com

    Good luck,

  3. #3
    Join Date
    Feb 2005
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    Re: calculating the kw's my unit is doing.

    Quote Originally Posted by theapprentice View Post
    hey everyone I need help calcualating how my kw's of refrigeration the new pakage unit I just installed is doing. The tradesman I work with has set it as my home work but I have lost one of my main tafe books and cant find any formulas. Can anyone please help me. All im after is the formula so I can work it out on my own. But we had 19.2 air on the coil 27.7 air off the coil with an air flow rate of 2350L/s. on heating of course. Sorry if this is in the wrong section im a newbie. Thanks for all your help
    chris.
    Watch out as one of your tafe teachers may be lurking here!!
    Q=M x C x ∆T
    where Q= amount of heat produced
    M=mass of air flowing
    C= specific heat of air
    ∆T=delta T or temp difference
    google for more info there is lots around.

    Go search the secondhand bookshops library for a copy of "Princinples of Refrigeration SI edition" by RJ Dossat it is indispensable.

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