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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink="#606420"><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Omar<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Based on ASHRAE Std 62.1, the total outside air must be calculated at the system level. If you then take the fraction of outside air supplied to the system and multiply it by your system flow to each zone, you will get the total outside air <b>supplied</b> to the zone. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>However, if you are trying to calculate the outside air <b>requirements</b> of the zone, you need to calculate the space and occupancy requirements based on the zone type (IE [# of occupants] * [cfm/occupant] + [square footage] * [cfm / sq ft]), and then divide them by the ventilation effectiveness (IE 0.8 when supplying hot air from ceiling diffusers).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Please note that the total outside air required at system level is <b>not</b> the sum of the individual zone requirements.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If you wish to get more information on this calculation, you can use the following link:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.ashrae.org/technology/page/132">http://www.ashrae.org/technology/page/132</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>and click on the standard 62.1-2001 addenda link. Then download addendum “n”.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>This addendum has a good explanation of how the calculations should be done. (Some of the occupancy tables have been updated since the addendum was published, but the calculation method is still valid).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I hope I have clarified this issue somewhat.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>MaryAnne Mason<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Omar Katanani<br><b>Sent:</b> Wednesday, December 01, 2010 2:51 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] LEED Question: Outdoor air intake flow for a VAV system..<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Dear all,</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>I have a LEED related question and I’d appreciate it if someone could help!</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>The LEED Reference guides show the method to calculate the outdoor air intake flow (V<sub>ot</sub>) for the multiple-zone system (VAV). This V<sub>ot</sub> is for the whole <a href="http://www.leeduser.com/glossary/14#term4654"><span style='color:navy'>AHU</span></a>. How can I find the V<sub>ot</sub> for each zone separately?</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Many thanks!</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Omar</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>___________________________</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Omar Katanani<br>Sustainable Design Engineer</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Email: <a href="mailto:omar@ecoconsulting.net">omar@ecoconsulting.net</a></span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:navy'>EcoConsulting (Lebanon)</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:navy'>Nahas Building, 4<sup>th</sup> floor</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:navy'>4 St-Maron Street / Georges Haddad Avenue</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:navy'>Postal Code: 2028 5806 SAIFI</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:navy'>Beirut, Lebanon</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:navy'>Tel: </span><span lang=EN-GB style='font-size:7.5pt;font-family:"Arial","sans-serif";color:navy'>+961 (0) 1 971 266<br>Mobile: +961 (0) 3 045 045</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:7.5pt;font-family:"Arial","sans-serif";color:navy'>EcoConsulting (UK) Ltd<br>28 Marshalsea Road<br>London, SE1 1HF<br>Tel: +44 (0) 207 939 0989<br>Fax: +44 (0) 207 939 0981</span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:7.5pt;font-family:"Arial","sans-serif";color:navy'>Website: <a href="http://www.ecoconsulting.net/">www.ecoconsulting.net</a></span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB> <o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> <img border=0 width=870 height=102 id="_x0000_i1025" src="cid:image001.jpg@01CB9153.097D49B0"></span><span lang=EN-GB><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB> <o:p></o:p></span></p></div></body></html>