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We have modelled similar systems by using traditional simulation to get the off-coil and on-coil conditions. We dump these to an hourly spreadsheet and model the psychrometrics there. We use the ASHRAE toolkit if wel feel necessary to model wet coils robustly etc. Many simulation programs assume a constant bypass (or contact) factor when in fact this is dynamic. I believe this is significnt to take into account with the types of systems decribed in humid climates. I haven't seen a simulation programe that can model your systems correctly but then I have only been exposed to EQuest (DOE-2.2), IES VE, TAS, HAP. I suspect TRNSYS may allow you to model it, but if you aren't already using it would you not be better off spending the time on a robust spreadsheet template ... good luck.<BR>
Regards,<BR>
Graham<BR>
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<B>On Tue Jan 4 5:24 , "Adam Niederloh" <ADAMN@TWGI.COM>sent:<BR>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial">All,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000080; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial">Happy New Year!<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial">I know that I recently asked the question shown below; however I did not receive any replies so I thought I would try again seeing as how it’s a brand new year. The question as previously asked: <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial">I am curious to know what programs/methodologies people have used to effectively model the following types of energy recovery systems:<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo2"><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial"><SPAN style="mso-list: Ignore">1.)<SPAN style="FONT: 8pt Times New Roman"> </SPAN></SPAN></SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial">Dual Wheel Heat Recovery with a Cooling Coil between the wheels. This system is similar to the SEMCO Pinnacle system. As the outdoor air travels through the air handler it passes first through a total energy wheel, then through a cooling coil and then through a passive dehumidification wheel. The exhaust air, as it leaves the building, travels through the passive dehumidification wheel and then the total energy wheel.<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.25in"><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo2"><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Calibri"><SPAN style="mso-list: Ignore">2.)<SPAN style="FONT: 8pt Times New Roman"> </SPAN></SPAN></SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial">Twice through Heat Recovery with a Cooling Coil in between the first and second pass. This system is similar to a DesertAire system. The outside air passes through the heat recovery device</SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: #000080; FONT-FAMILY: Arial">, </SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">through a cooling coil</SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: #000080; FONT-FAMILY: Arial">,</SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> and then </SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial">through the other side of the same</SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> heat recovery device thus pre-cooling the outdoor air and reheating the supply air.</SPAN><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Calibri"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Calibri"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial">Please see the attached PDF for very simple schematic sketches of each option.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial">Thanks,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000080; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial">Adam</SPAN><o:p></o:p></P></DIV></DIV></BLOCKQUOTE></HTML>
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