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Abstract
Heat loss through tapered insulation is generally computed using an R-value based on average thickness of the tapered section. However, this misrepresents the actual performance of tapered insulation, which is always less efficient than an equal volume of untapered insulation. For commonly encountered slopes formed with one-way and four-way tapers, the true efficiency of tapered insulation (compared with an equal volume of untapered insulation) depends only on the ratio of high- and low-point R-values, and ranges from 100 to about 70 percent for R-value ratios that are between 1 and 10.
Heat loss through tapered insulation is generally computed using an R-value based on average thickness of the tapered section. However, this misrepresents the actual performance of tapered insulation, which is always less efficient than an equal volume of untapered insulation. For commonly encountered slopes formed with one-way and four-way tapers, the true efficiency of tapered insulation (compared with an equal volume of untapered insulation) depends only on the ratio of high- and low-point R-values, and ranges from 100 to about 70 percent for R-value ratios that are between 1 and 10.
Date
8/2011
8/2011
Author(s)
Jonathan Ochshorn
Jonathan Ochshorn
Page(s)
45-
45-
Keyword(s)
heat loss; tapered insulation; R-value; heat flux;
heat loss; tapered insulation; R-value; heat flux;