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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear Forums,<o:p></o:p></p><p class=MsoNormal>A recent discussion with a colleague has made me question my understanding of the proper way to model an HVAC system when humidity control is a project criteria. Imagine a building in South Florida that requires the <u>space humidity not to exceed 55% RH</u>. <o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo3'><![if !supportLists]><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>The building might use Baseline system #4 (heat pump with electric supplemental heating). I have modeled that in the past simply as a normal heat pump with sub-cool + electric reheat for humidity control.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo3'><![if !supportLists]><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Another possibility is a System #5 or #6 (VAV fan with VAV or PFP boxes and reheat). <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='font-size:14.0pt'>The question is this:<o:p></o:p></span></b></p><p class=MsoNormal>90.1 has restrictions on the amount of air that may be reheated (It’s the greater of 0.4 cfm / sq.ft. or 30% of the peak airflow rate plus a few other items). These are noted in <u>Section 6.5</u>.<o:p></o:p></p><p class=MsoNormal>Appendix G, however, does not reference the requirements of Section 6.5 anywhere (that I can see). <b><span style='color:red'>Do they apply to a Baseline energy model?</span></b><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks for your input!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><img width=336 height=192 id="Picture_x0020_1" src="cid:image003.jpg@01CD2202.6682F5B0" alt="Description: BPT BizCard JVDII Updated"><o:p></o:p></p><p class=MsoNormal style='margin-top:6.0pt'><b><i><span style='font-size:10.0pt'>Making me think….<o:p></o:p></span></i></b></p><p class=MsoNormal style='margin-top:6.0pt'><span style='font-size:10.0pt'>Seek truth while you are young, for if you do not, it will later escape your grasp</span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>