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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I have reviewed the list archives on this issue and found some conflicting opinions for residential buildings. To give some background, I am working on a model for a large adaptive reuse project that includes the conversion of a warehouse building to residential apartments. The proposed design includes split system heat pumps in the units (Electric Heat) and several RTUs (fossil fuel heat) serving as DOASs w/ energy recovery conditioning the corridor spaces and supplying/exhausting air from the residential apartment spaces. The corridor spaces exceed 25,000 square feet and 5 floors. I have the proposed design squared away, but I was hoping for an endorsement of my approach to the baseline before reconfiguring almost everything under my air-side HVAC tab.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For the baseline systems my strict reading of Table G3.1.1A along with the exceptions under G3.1.1 would indicate that for my baseline design I would do the following:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-Apartment spaces: System 2 PTHP.<o:p></o:p></p><p class=MsoNormal>-Corridor spaces: System 7 VAV w/ Reheat. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am hesitant to plunge forward, as System 7 seems an unrealistic baseline for this application. I am also a bit confused as to how I should model the outside air delivery in my baseline. I believe I should deliver outside air via the central systems as I did in the proposed design rather than directly at the PTHP in each unit. Since the building is in Climate Zone 3A, I would not include an economizer, but I might have to include exhaust air heat recovery for cooling if the design supply air capacity for these systems exceeds 5,000 CFM, per G3.1.2.10. Am I interpreting that correctly?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>To top it off, there was also a school of thought within the archives that one should model the whole baseline building with System 2 for this situation. It would certainly be less complicated, but create issues around fuel use type and fan power.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Any feedback is much appreciated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Robert Stephenson<o:p></o:p></p><p class=MsoNormal>Technical Energy Analyst<o:p></o:p></p><p class=MsoNormal>Evaluation, Measurement & Verification Services<o:p></o:p></p><p class=MsoNormal><b>Vermont Energy Investment Corporation<o:p></o:p></b></p><p class=MsoNormal>rstephenson@veic.org<o:p></o:p></p><p class=MsoNormal>(802) 540-7886<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>