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</o:shapelayout></xml><![endif]--></head><body lang=FR link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Verdana","sans-serif"'>Hi <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Verdana","sans-serif"'>I recently performed a comparison between a simplified approach (as specified in ISO 13370 annex D) and a detailed one (as implemented in Type49 from Trnsys standard library, simulation over 3 years) for ground heat transfer calculation.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Verdana","sans-serif"'>The case study is a 2 storeys office building, floor area nearing 1500 m2, slab on grade with 2 m horizontal peripheral insulation (R=1.7 m2.K/W). <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Verdana","sans-serif"'>I get the results shown in attachment:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-GB style='font-size:8.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-GB style='font-size:8.0pt;font-family:"Verdana","sans-serif"'>TAirInocc.pdf: air temperature during the first week-ends of the year (numbered from 7 to 18, building unoccupied, HVAC systems off) for the ground floor thermal zones (numbered 2, 3, 6 and 8): discrepancy around 2°C between the simplified calculation ('0Ref') and the detailed one ('1Sol').<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-GB style='font-size:8.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-GB style='font-size:8.0pt;font-family:"Verdana","sans-serif"'>PuisMoy0.pdf: mean heating power during a typical day of the week (negative as a convention) for the two water loops heating the ground floor premises: discrepancy between 20% and 50%, the main impact being observed during morning restart.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-GB style='font-size:8.0pt;font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-GB style='font-size:8.0pt;font-family:"Verdana","sans-serif"'>Another comparison has been performed with continuous insulation under the slab (R=1.7 m2.K/W) and leads to similar discrepancies.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Verdana","sans-serif"'>Has anyone amid you ever noticed such a gap between these two kinds of calculation. Or perhaps somebody has further information regarding the qualification of the simplified approach presented in the international standard ISO 13370 or the detailed one implemented in Type49?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Verdana","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Verdana","sans-serif";mso-fareast-language:FR'>Thanks a lot for any insight regarding this issue.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;font-family:"Verdana","sans-serif";mso-fareast-language:FR'>Best<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:#404040;mso-fareast-language:FR'>--<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:#404040;mso-fareast-language:FR'>Antoine Gautier<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:#404040;mso-fareast-language:FR'>Solamen<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:#404040;mso-fareast-language:FR'>+33 6 58 24 02 60<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Verdana","sans-serif";color:#404040;mso-fareast-language:FR'>antoine.gautier@solamen.fr<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>