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Calculation of U-value of tyre-and-adobe walls?
If you are aware of any online resources where I would be able to calculate the U- and R-values of a wall built out of car tyres filled with adobe, please let me know! Thanks!
1 Answer
- RobertBLv 58 years agoFavorite Answer
No, I don't think you will find it online. However, I looked in my old ASHRAE fundamentals book and came up with these values. I think adobe is close to stucco and cement mortar which both have a k value of 5 and an R value of .2 for one inch of thickness. I also found a value for rubber goods of .92 for k the units on k are BTU/(hour, ft2, oF, ft of thickness).
Not sure how familiar you are with these calcs so here is some basics. Please do not forget the R inside and outside air film coefficient of .68 and .17 (15mph wind). Once you find the k value for each component take the inverse to get the R resistance. Add all of the resistance components. Take this total and invert it to get the U value.
Outside R + adobe R + rubber R + other components R + inside R = Total resistance
1/Total resistance = U value
