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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>This one is for all the TRNFLOW experts
out there!<br>
<br>
</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>We are modeling a large continuous (14000
m3!) air space shaped like a big spiral, and were hoping to use TRNFLOW to
investigate the stratification and resulting air flows. There are three
additional areas of the building with completely independent air handling
units. First question is how best to model each of the three separate AHU’s
in TRNFLOW, since it requires only </span></font><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>ONE</span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> network. To connect them all together we made a “crack”
type connection with negligible size (flow coefficient) between each zone and a
single auxiliary node with fixed to a constant pressure. Is this a good way to
link independent networks? </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Additionally, in each air handling unit,
there is a mixing or return air path, so a large percentage of the conditioned
air is recycled as is typical. Because we had problems, we were looking for a “duct”
type that would add storage to the loop and maybe help it converge? </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Generally we had big simulation problems
with our approach, with temperatures beyond the dewpoint, humidities that were unphysically
large, and errors such as “PANE TEMPERATURE CALCULATION IS </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>DIVERGING”. We were not able to
track down the bug (getting at the data is a big challenge). We have since
changed the approach and disabled TRNFLOW, connecting the air handlers through the
“ventilation” input in Type 56, but we are still worried about the
stratification. </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Best regards,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Marcus</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p style='margin:0cm;margin-bottom:.0001pt'><b><font size=2 color=navy
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:navy;font-weight:bold'>MARCUS JONES, MSc</span></font></b></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=3 color="#788386"
face=Arial><span lang=EN-GB style='font-size:12.0pt;font-family:Arial;
color:#788386'>Energy Department</span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=3 color="#788386"
face=Arial><span lang=EN-GB style='font-size:12.0pt;font-family:Arial;
color:#788386'>Sustainable Building Technologies </span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=1 color=navy face=Arial><span
lang=EN-GB style='font-size:9.0pt;font-family:Arial;color:navy'> </span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><b><font size=3 color="#788386"
face=Arial><span lang=DE style='font-size:12.0pt;font-family:Arial;color:#788386;
font-weight:bold'>AIT</span></font></b></u1:stockticker><b><font
color="#788386" face=Arial><span lang=DE style='font-family:Arial;color:#788386;
font-weight:bold'> Austrian Institute of Technology </span></font></b></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=3 color="#788386"
face=Arial><span lang=DE style='font-size:12.0pt;font-family:Arial;color:#788386'>Österreichisches
Forschungs- und Prüfzentrum Arsenal Ges.m.b.H. </span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=3 color="#788386"
face=Arial><span lang=IT style='font-size:12.0pt;font-family:Arial;color:#788386'>Giefinggasse
2 | 1210 Vienna | Austria </span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=3 color="#788386"
face=Arial><span lang=IT style='font-size:12.0pt;font-family:Arial;color:#788386'>T
+43(0) 50 550-6387 | M +43(0) 664 210 24 15 | F +43(0) 50550-6598</span></font></p>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=3 color=blue face=Arial><span
lang=EN-GB style='font-size:12.0pt;font-family:Arial;color:blue'><a
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