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

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Ariana Parrish

February 10, 2020 00:21

Hello all, If I am given a wall with the exterior and interior temperature and I'm asked to determine the temperature let's say at the midpoint of the insulation....how do I calculate this? 

 

Thanks!

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  Erin Cooper February 10, 2020 01:27

  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 February 10, 2020 02:58

  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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