<p class="MsoNormal" style="text-align: justify; background: none repeat scroll 0% 0% white;"><span style="font-size: 12pt; line-height: 115%; font-family: "Times New Roman","serif";" lang="EN-US">Hello ESP-r
world,</span></p><p class="MsoNormal" style="text-align: justify; background: none repeat scroll 0% 0% white;"><span style="font-size: 12pt; line-height: 115%; font-family: "Times New Roman","serif";" lang="EN-US"><br>
</span></p>
<p class="MsoNormal" style="text-align: justify; background: none repeat scroll 0% 0% white;"><span style="font-size: 12pt; line-height: 115%; font-family: "Times New Roman","serif";" lang="EN-US">I Hope you can
help me,</span></p>
<p class="MsoNormal" style="text-align: justify; line-height: normal; background: none repeat scroll 0% 0% white;"><span style="font-size: 12pt; font-family: "Times New Roman","serif"; background: none repeat scroll 0% 0% white;" lang="EN-US">I am trying to
determine the amount of energy that passes through a wall. I have a fairly
simple model (square with 10x10 each side and 3m height). I have a basic control with 25
degrees the whole summer (June till September), there are no internal gains
from occupants or lights and I want to know the amount of gain/loss through the
walls</span><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">.</span></p>
<p class="MsoNormal" style="text-align: justify; line-height: normal; background: none repeat scroll 0% 0% white;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">Once simulated, if I go through <i>Enquire about/Zone Energy
Balance/Integrated over <span style="background: none repeat scroll 0% 0% white;">time/Gain-Loss</span></i><span style="background: none repeat scroll 0% 0% white;"> I have the following results,</span></span></p>
<p class="MsoPlainText"><span style="font-family: "Courier New";" lang="EN-US"> </span></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span><span style=""> </span>Gain<span style=""> </span>Loss</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Infiltration air load<span style=""> </span>0.000<span style=""> </span>0.000</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Ventilation air load<span style=""> </span>0.000<span style=""> </span>0.000</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Uncontr`d casual Occupt<span style=""> </span>0.000<span style=""> </span>0.000</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Uncontr`d casual Lights<span style=""> </span>0.000<span style=""> </span>0.000</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Uncontr`d casual Equipt<span style=""> </span>0.000<span style=""> </span>0.000</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Thermal bridge (linear)<span style=""> </span>0.000<span style=""> </span>0.000</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Storage at air point<span style=""> </span>0.925<span style=""> </span>-0.977</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Opaque surf convec: ext<span style=""> </span>233.485<span style=""> </span>-16.093</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Opaque surf convec: ptn<span style=""> </span>157.405<span style=""> </span>-33.853</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Transp surf convec: ext<span style=""> </span>0.000<span style=""> </span>0.000</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Transp surf convec: ptn<span style=""> </span>0.000<span style=""> </span>0.000</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Convec portion of plant<span style=""> </span>44.617<span style=""> </span>-385.509</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Totals<span style=""> </span>436.433<span style=""> </span>-436.433</span></b></p>
<p class="MsoNormal"><span style="" lang="EN-US"> </span></p>
<p class="MsoNormal" style="text-align: justify; line-height: normal;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">I suppose that the gains from
the walls would be 233.485+157.405= 390.989 Whrs, and losses 16.093+33.853 = 49.946
Whrs. (there’s no other source of internal gain in the model).</span></p>
<p class="MsoNormal" style="text-align: justify; line-height: normal;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">So far so good, nevertheless,
if I go through <i>Surface energy balance/Integrated over <span style="background: none repeat scroll 0% 0% white;">time/Gain-Loss/All
Items</span></i><span style="background: none repeat scroll 0% 0% white;">,
I get something like,</span></span></p>
<p class="MsoNormal"><span style="" lang="EN-US"> </span></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span><span style=""> </span>Facing Teste<span style=""> </span>Facing outside</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Gain<span style=""> </span>Loss<span style=""> </span>Gain<span style=""> </span>Loss</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Conductive flux<span style=""> </span>111853.23<span style="">
</span>-16240.70<span style=""> </span>1745485.50 -1842903.13</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Convective flux<span style=""> </span>3598.84<span style="">
</span>-53664.82<span style=""> </span>1333.83 -3128152.00</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Longwave rad int<span style=""> </span>15327.17<span style="">
</span>-60134.77<span style=""> </span>--<span style=""> </span>--</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>LW rad ext >bldg<span style=""> </span>--<span style=""> </span>--<span style="">
</span>476125.97<span style=""> </span>-244280.39</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>LW rad ext >sky<span style=""> </span>--<span style=""> </span>--<span style=""> </span>0.00 -2835801.50</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>LW rad ext >grnd<span style=""> </span>--<span style=""> </span>--<span style="">
</span>27968.51<span style=""> </span>-643154.69</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Shortwave rad.<span style=""> </span>0.00<span style=""> </span>0.00<span style="">
</span>6443323.00<span style=""> </span>0.00</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Occupt casual gn<span style=""> </span>0.00<span style=""> </span>0.00<span style=""> </span>--<span style=""> </span>--</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Lights casual gn<span style=""> </span>0.00<span style=""> </span>0.00<span style=""> </span>--<span style=""> </span>--</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Equipt casual gn<span style=""> </span>0.00<span style=""> </span>0.00<span style="">
</span><span style=""> </span>--<span style=""> </span>--</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Controled casual<span style=""> </span>0.00<span style=""> </span>0.00<span style=""> </span>--<span style=""> </span>--</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Heat stored<span style=""> </span>15333.66<span style=""> </span>-16072.75<span style="">
</span>720997.19<span style=""> </span>-720940.69</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Plant<span style=""> </span>0.00<span style=""> </span>0.00<span style=""> </span>0.00<span style=""> </span>0.00</span></b></p>
<p class="MsoPlainText"><b style=""><span style="font-family: "Courier New";" lang="EN-US"><span style=""> </span>Totals<span style=""> </span>146112.91<span style=""> </span>-146113.05<span style="">
</span>9415234.00 -9415233.00</span></b></p>
<p class="MsoNormal"><span style="" lang="EN-US"> </span></p>
<p class="MsoNormal" style="text-align: justify; line-height: normal;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">for each surface of the model
(4 walls, ceiling and pavement). </span></p>
<p class="MsoNormal" style="text-align: justify; line-height: normal;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">Having those values for each
surface, I sum the losses of the surface facing inside (<b style="">392043Whrs</b>), which would be the convective heat that is transferred
to the zone, i.e., gain and losses that comes from the <i>Zone energy balance</i>, as
referred <span style="background: none repeat scroll 0% 0% white;">to
initially (Gain <b style="">390,989 kWhrs</b>, and losses
49946 Whrs). The problem is that the</span> results are <b style="">very</b> different <b style="">(392043Whrs/390989kWhs)</b>,
and I don’t know why. My suppositions must be wrong.</span></p>
<p class="MsoNormal" style="text-align: justify; line-height: normal;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">How can I actually get the
amount of energy that passes through the walls (gains and losses)? <br></span></p><p class="MsoNormal" style="text-align: justify; line-height: normal;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US"><br>
</span></p>
<p class="MsoNormal" style="text-align: justify; line-height: normal;"><span style="font-size: 12pt; font-family: "Times New Roman","serif";" lang="EN-US">Thanks for your help</span></p>
-- <br>Eduardo Gonçalves<br>+ 351 913 310 390<br>