<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><p class="MsoNormal" style="text-align:justify;margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><b><i><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif">Dear TRNSYS users,</span></i></b></p>

<p class="MsoNormal" style="text-align:justify;margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><b><i><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif">I am using TRNSYS
to model air conditioning system with DOAS and compare it with radiant chilled ceiling (see fig1 in  attached file).</span></i></b></p>

<p class="MsoNormal" style="text-align:justify;margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><b><i><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif"> </span></i></b><b style="font-size:11pt"><i><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif">In this process I have
used BALANCE 4 <span lang="TH">- </span>ENERGY BALANCE FOR ZONES <span lang="TH">(</span>NTYPE
904<span lang="TH">)</span></span></i></b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif"> for finding the energy
gain in the zone.</span></p>

<p class="gmail-Default" align="center" style="text-align:center;margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:Arial,sans-serif;color:black"><span style="font-family:"Times New Roman",serif">B4_QBAL <span lang="TH">=- </span>B4_DQAIRdt <span lang="TH">+ </span>B4_QHEAT <span lang="TH">- </span>B4_QCOOL <span lang="TH">+ </span>B4_QINF</span></p>

<p class="gmail-Default" align="center" style="text-align:center;margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:Arial,sans-serif;color:black"><span lang="TH" style="font-family:"Times New Roman",serif">+ </span><span style="font-family:"Times New Roman",serif">B4_QVENT <span lang="TH">+ </span>B4_QCOUP <span lang="TH">+ </span>B4_QTRANS</span></p>

<p class="gmail-Default" align="center" style="text-align:center;margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:Arial,sans-serif;color:black"><span lang="TH" style="font-family:"Times New Roman",serif">+ </span><span style="font-family:"Times New Roman",serif">B4_QGINT <span lang="TH">+ </span>B4_QWGAIN <span lang="TH">+ </span>B4_QSOL</span></p>

<p class="gmail-Default" align="center" style="text-align:center;margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:Arial,sans-serif;color:black"><span lang="TH" style="font-family:"Times New Roman",serif">+ </span><span style="font-family:"Times New Roman",serif">B4_QSOLAIR<span lang="TH">                     [</span>kJ<span lang="TH">/</span>hr<span lang="TH">]
</span></span></p>

<p class="MsoNormal" align="center" style="text-align:center;margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif"> </span></p>

<p class="MsoNormal" style="text-align:justify;margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif">From this I have <b>generated
B4_QTRANS which “is transmission into the surface from inner surface node <span lang="TH">(</span>might be stored in the wall, going to a slab cooling or
directly transmitted<span lang="TH">)</span>”</b> as per TRNSYS manual. I printed
“B4_QTRANS”, which is the heat flux in the zone via the building envelope as
per my understanding. </span></p><p class="MsoNormal" style="text-align:justify;margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif">And</span></p>

<p class="MsoNormal" style="text-align:justify;margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif"> I also used <b><i>BALANCE 6 <span lang="TH">- </span>ENERGY
BALANCE FOR SURFACES <span lang="TH">(</span>NTYPE 906<span lang="TH">) </span></i></b>for
finding heat flux in the room via the surface. </span></p>

<p class="gmail-Default" align="center" style="text-align:center;margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:Arial,sans-serif;color:black"><span style="font-family:"Times New Roman",serif">B6_BAL <span lang="TH">= - </span>B6_DQWALLdt – B6_QCOMI
<span lang="TH">+ </span>B6_QCOMO <span lang="TH">+ </span>B6_QRADGI</span></p>

<p class="gmail-Default" align="center" style="text-align:center;margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:Arial,sans-serif;color:black"><span lang="TH" style="font-family:"Times New Roman",serif">+ </span><span style="font-family:"Times New Roman",serif">B6_QRADGO <span lang="TH">- </span>B6_QALG           <span lang="TH">[</span>kJ<span lang="TH">/</span>hr<span lang="TH">] </span></span></p>

<p class="MsoNormal" align="center" style="text-align:center;margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black"> ;</span></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black">B6_QCOMI combined heat flux to
inside <span lang="TH">(</span>going into zone<span lang="TH">+</span>; going into
wall <span lang="TH">-)</span></span></b></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black">I generated the heat flux inside the room
from all the surface (6 surfaces) and summed them up and let this be <b>Total_wall_in</b>.</span></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black">Now, from this I have some questions.</span></p>

<p class="gmail-MsoListParagraphCxSpFirst" style="margin:0cm 0cm 0.0001pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black">My first question is </span></p>

<p class="gmail-MsoListParagraphCxSpLast" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black">(1) “<b>what is the difference between </b></span><b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif">B4_QTRANS
and the sum of – B6_QCOMI<span style="color:black"> from all the surfaces
(Total _wall_in)?”</span></span></b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black"> Shouldn’t they be same? (plot as fig 2 in attached file)</span></p>

<p class="MsoNormal" style="text-indent:36pt;margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black">I tried to
see the difference between the heat flux from the zone balance </span><b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif">B4_QTRANS</span></b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black"> and <b>Total_wall_in</b>(sum of B6_comin from all the surfaces)
and got the following plot.</span></p>

<p class="MsoNormal" align="center" style="text-align:center;margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black"> </span></b></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black"> </span></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black">My second question is</span></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black">2)  
For the surface balance I plotted </span><b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif">B6_QCOMI</span></b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black"> , </span><b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif">B6_QRADGI</span></b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black">, inside and outside temperature of the surface. I calculated the
heat flux via Q = U(TD) and plotted it as well. The plot is shown in fig 3 of attached files.</span></p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"> </p>

<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-size:11pt;font-family:Calibri,sans-serif"><b><span style="font-size:12pt;line-height:107%;font-family:"Times New Roman",serif;color:black"> Should b6_comin_1 and Q_N be equal or not. What
are the factors that make them different?</span></b></p></div></div></div></div></div>