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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have modeled a multifamily building for LEED which uses a variable refrigerant flow system. In the building each stack of apartment’s heating and cooling is provided by one unit, but the stack next door is provided by a different unit. The efficiency is determined by the outdoor unit and varies slightly by size, which is not the same for all apartment units. I have modeled several apartments as one thermal block and I had calculated an overall system efficiency by doing a weighted average based on system size. My reviewer has commented that per G3.1.10a I need to use the individual system size and efficiency for each system. I am wondering if they will accept a weighted average by thermal block instead of an overall system average. It seems quite clear under G3.1.9 that modeling multiple apartments on the same wall is perfectly acceptable. Do you need to have multiple systems serve each zone? I did not think this is possible.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Any thoughts/experience with this situation would be greatly appreciated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Michael<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif"'>____________________________<br>Michael Shields<br>Facility Strategies Group, LLC<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif"'>1012 Market Street, Suite 307<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif"'>Fort Mill, SC 29708<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif"'>Phone: 803-493-4507</span><span style='font-size:10.0pt;font-family:"Book Antiqua","serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Book Antiqua","serif"'>Fax: 803-548-2511<br>Email: <a href="mailto:mshields@fstrategies.com"><span style='color:blue'>mshields@fstrategies.com</span></a><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>