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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>I don’t necessarily see a problem from the info presented, but the complete/correct answer requires more knowledge about your design conditions and system configuration. From what was explained, it sounds like your 50% RH set point can be maintained with whatever you specified for the cooling LAT. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I would only expect summer reheat if you had to cool below your desired LAT to achieve sufficient dehumidification (or if you had a multi-zone VAV with reheat and had interior zones being overcooled in the summer, but that does not sound like what you’re modeling). If you’re trying to supply at 55 F but have to cool to a lower temperature to dehumidify, there should be reheat. Otherwise, coming off the coil at or near 55 F & 90%+ RH is often sufficient for maintaining 50% RH and a dry bulb temperature in the low to mid 70’s. Note that the reheat does nothing for moisture removal, it simply heats the airstream back up to avoid over cooling the zone. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Plot your design conditions on a psychometric chart and see if they make sense – I’d be happy to help in this regard. Just send me your supply air, exterior design conditions, and interior design conditions.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thanks,</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f">
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</v:shape><![endif]--><![if !vml]><span style='mso-ignore:vglayout;position:absolute;z-index:251659264;margin-left:-10px;margin-top:12px;width:82px;height:94px'><img width=82 height=94 src="cid:image004.png@01CBFEB0.1D2CB700" alt=" " v:shapes="_x0000_s1026"></span><![endif]><span style='color:black'> <o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in;text-indent:27.0pt'><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'>DAKOTA KELLEY </span></b><b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></b></p><p class=MsoNormal style='margin-left:.5in;text-indent:27.0pt'><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'>Project Designer | Energy Analyst<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'> </span><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'>Office: 214.744.6199 <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'> Cell: 214.280.3825<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'> Fax: 214.744.0770</span><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'> </span><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'><a href="http://www.teliospc.com/">http://www.teliospc.com </a> 3535 Travis St. Suite 115<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'><a href="mailto:dakotak@teliospc.com">dakotak@teliospc.com</a></span><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'> </span><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'>Dallas, TX 75204</span><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:#3333FF'>| MEP ENGINEERING · ENERGY MODELING · LEED CONSULTATION · COMMISSIONING |</span><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:#3333FF'><o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:FranklinGothic-BookCnd;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal style='text-align:justify'><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:gray'>CONFIDENTIALITY NOTICE: This email is intended only for the use of the individual or entity to which it is addressed, <o:p></o:p></span></p><p class=MsoNormal style='text-align:justify'><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:gray'>And may contain information that is privileged, confidential and exempt from disclosure under applicable law. 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Copyright © 2011 Telios Corporation.<o:p></o:p></span></p><p class=MsoNormal style='text-align:justify'><span style='font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";color:gray'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'> <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Sami, Vikram [mailto:Vikram.Sami@perkinswill.com] <br><b>Sent:</b> Tuesday, April 19, 2011 1:37 PM<br><b>To:</b> Equest Users Mailing List<br><b>Subject:</b> [Equest-users] Humidity control question<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>So I have an HVAC system setup with a preheat coil, a cooling coil and a heating coil. The humidistat is set to 50%, and it’s a 100% OA system. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I assumed you set the LAT for the cooling coil with the cold deck min leaving temp and then the LAT for the heating coil with the Zone entering min supply temp. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m getting curious results though – I get no heating loads in the summer months – which I should get for humidity control. I setup some hourly reports to track the temperature of the air leaving the heating & cooling coils and the dehumidification reheat heat as well as the moisture added or removed from the air for dehumidification. I notice that while the cooling coil & heating coil temps seem to be ok and there is moisture removal reported, there seems to be no energy reported for reheat for humidity control. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>What am I missing?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'><o:p> </o:p></span></b></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Vikram Sami</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>, LEED AP BD+C<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Sustainable Design Analyst<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>1315 Peachtree St. NE, Atlanta, GA 30309<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>t: 404-443-7462 f: </span><span lang=ES style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>404.892.5823 </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> e: <a href="mailto:vikram.sami@perkinswill.com">vikram.sami@perkinswill.com</a> </span><a href="http://www.perkinswill.com/"><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray;text-decoration:none'>www.perkinswill.com</span></a><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'><o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:3.0pt;text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Perkins+Will.</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#ADD425'>Ideas + buildings that honor the broader goals of society</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:green'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#2CA2C4'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#2CA2C4'>Perkins+Will is carbon neutral.</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#96BC0D'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Learn more about our </span><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#2CA2C4'><a href="http://2030e2.perkinswill.com/"><span style='color:#2CA2C4'>2030 Challenge Estimating + Evaluation</span></a></span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> tool for fossil fuel free buildings <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>This email and any files transmitted with it are confidential and intended solely for the addressee. 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