<p><p class="MsoNormal" style="margin-bottom: 0.0001pt; "><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222;
mso-ansi-language:EN-US">If I know the dimensions of the building, the thermal conductivity
of the soil, thickness and thermal conductivities of the layers composing the slab-on-grade
floor, how can I calculate the U-factor (or Reff or the F-factor) of the floor in contact with ground?<o:p></o:p></span></p>

<p class="MsoNormal" style="margin-bottom: 0.0001pt; "><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222;
mso-ansi-language:EN-US">I would like to calculate the U-factor (or Reff or the
F-factor) before I create the dynamic model in order to compare that value with
the limits of ASHRAE 90.1 Table 5.5. I know the method of the European
technical standard EN ISO 13370, but I think it is not compatible with ASHRAE
90.1, which was written in the United States.<o:p></o:p></span></p>

<p class="MsoNormal" style="margin-bottom: 0.0001pt; "><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222;
mso-ansi-language:EN-US">Best Regards<o:p></o:p></span></p>

<p class="MsoNormal" style="margin-bottom: 0.0001pt; "><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222;
mso-ansi-language:EN-US">Francesco Passerini<o:p></o:p></span></p></p><div id="_mcePaste" style="position: absolute; left: -10000px; top: 0px; width: 1px; height: 1px; overflow: hidden; "> </div>