<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div><span><font class="Apple-style-span" face="arial, helvetica, sans-serif" size="3">I am simulating single zone by Trnbuild and Trnsys 17, I define the floor as <b>boundary </b>and select boundary as <span><b>identical </b></span>when I read the energy from inside surf. of floor conv. to air and longwave </font><font class="Apple-style-span" face="arial, helvetica, sans-serif">radiation</font><font class="Apple-style-span" face="arial, helvetica, sans-serif" size="3"> to other surfaces = NTYPE19 the QCOMI of floor, and Temp. of inside floor, I note that, </font></span></div><div><span><font class="Apple-style-span" face="arial, helvetica, sans-serif" size="3">for all cases when I define the ground Temp i.e Input of type 56 by type 77 (ground temp ) or by const value , the QCOMI always keeps
+ve while T sur_in < T zone, i.e the energy transfer from air zone to floor , but </font></span><span class="Apple-style-span" style="font-family: arial, helvetica, sans-serif; ">QCOMI</span><span class="Apple-style-span" style="font-family: arial, helvetica, sans-serif; "> must be -ve, </span><span class="Apple-style-span" style="font-family: arial, helvetica, sans-serif; "><b>Why </b>?</span></div><div><span class="Apple-style-span" style="font-family: arial, helvetica, sans-serif; ">Any one can help me to Know what is happen ?</span></div><div><span class="Apple-style-span" style="font-family: arial, helvetica, sans-serif; ">thanks</span></div><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; "><span class="Apple-style-span" style="font-family: tahoma, 'new york', times, serif; ">------</span><br></div><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; "><font face="tahoma, 'new
york', times, serif">Best Regadrs</font></div><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; "><font face="tahoma, 'new york', times, serif">Eng. Ayman Mohamed</font></div><div style="font-size: 12pt; "><font class="Apple-style-span" face="tahoma, 'new york', times, serif"><br></font></div></div></body></html>