How do I calculate the temperature of the wall from exterior to interior

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    Erin Cooper

    There are two methods, ratio method and a formula.

    Ratio Method: At the point in question, if 80% of the R value is on the inside of the wall, the temp at that point is 20% less than the outside temp.

    Formula: Temp @ point = Temp Outside + [ (R outside / R total) x delta T ]

    I struggled with this one too and delved a lot into it, but the ratio method is what I think is the best because questions on the test will likely be in a simplistic format. 

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    Robin Tannenbaum

    Wow I never know the ratio method but it makes so much sense.  Thanks!  FYI, I believe the Amber videos has a good explanation of the Formula method but really just knowing and practicing the formula above is good. 

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    Ransolina Sawyerr

    Thanks Erin and Robin!

    In the formula method, what is delta T? How do you find the temp at a point on the wall if delta T is not given?  For example, if a question may give just outside temperature and R-value. Any suggestions are appreciated.

     

     

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