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Thread: K and U

  1. 01-08-2008, 07:42 AM #1
    ramana1574
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    K and U

    Hello friends,

    what is the differece between U Factor and K factor


    Ramana
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  2. 01-08-2008, 05:11 PM #2
    hvacker
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    Last edited by hvacker; 01-08-2008 at 05:27 PM.
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  3. 01-08-2008, 06:32 PM #3
    dandyme
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  4. 01-08-2008, 07:46 PM #4
    powell
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    Quote Originally Posted by ramana1574 View Post
    Hello friends,
    what is the differece between U Factor and K factor
    Ramana
    The answer is alot of formulas etc....a Google search would show these.

    Quick answer:

    K factor: Thermal Conductivity, defined as the rate of heat transfer through a homogeneous material in BTU per hour per square foot of area per F temperature differential per inch of thickness.

    U factor: Thermal Resistance, defined as the resistance of a material to heat flow and is, by definition, the reciprocal of a given heat transfer coefficient.

    Don't I sound smart?

    Actually this information came from the Krack refrigeration manual.
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  5. 01-08-2008, 08:21 PM #5
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    hvaccolo
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    K factor is straight with three angles. U factor is very curvy.
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  6. 01-09-2008, 01:51 AM #6
    ramana1574
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    Because

    Till now i am calculating cooling loads manually with know concepts and by taking U factor in to consideration.

    Now i have started using a software called 4M Fine HVAC which is an integrated environment with drawing for cooling load calculation, psychrometry calculations and air duct network design.

    This s/w is using SI units and they are considering K factor for all walls, openings etc..

    I am getting the results almost similar if i consisder the same ufactor as kfactor.


    ramana
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