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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'>HI Glenn,<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 had not. After looking at this for a long time, my suspicion is that I am misinterpreting the reports somehow. So that is good know.<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"'> Haynes, Glenn [mailto:Glenn.Haynes@dnvgl.com] <br><b>Sent:</b> Thursday, May 28, 2015 2:39 PM<br><b>To:</b> Adam Barker<br><b>Subject:</b> RE: Heat recovery working too well?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Have you considered that the LS-D loads are calculated with the LOADS space conditions and not the SYSTEM space conditions? So usually a direct comparison of results is not that meaningful.<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"'> Equest-users <a href="mailto:[mailto:equest-users-bounces@lists.onebuilding.org]">[mailto:equest-users-bounces@lists.onebuilding.org]</a> <b>On Behalf Of </b>Adam Barker<br><b>Sent:</b> Thursday, May 28, 2015 1:22 PM<br><b>To:</b> 'equest-users'<br><b>Subject:</b> [Equest-users] Heat recovery working too well?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Has anyone else come across heat recovery giving <i>very </i>good results in their model that are higher than expected. In a heating dominated climate, we have a PSZ system serving 5 zones, with baseboards used to meet heating loads in the slave zones (they’ve been hard sized to just get the unmet hours in an acceptable range). <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have broken down an analysis of building heating energy by month, from LS-D and SS-D. Assuming the SS-D account for all ‘building’ loads (envelope, infiltration, lights, etc), and SS-D is all that, plus the OA load. For a 50% effective ERV (and no additional fan heat), I get the following for winter months:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=624 style='width:6.5in;border-collapse:collapse'><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td><td width=302 nowrap colspan=3 valign=bottom style='width:226.45pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><b><span style='color:black'>Monthly Heating Energy Used (MBTU)<o:p></o:p></span></b></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td></tr><tr style='height:60.0pt'><td width=64 valign=bottom style='width:48.35pt;border:none;border-bottom:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;height:60.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'> <o:p></o:p></span></p></td><td width=98 valign=bottom style='width:73.35pt;border:none;border-bottom:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;height:60.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>Envelope Loads (LS-D) no ERV<o:p></o:p></span></p></td><td width=106 valign=bottom style='width:79.15pt;border:none;border-bottom:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;height:60.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>Envelope and OA energy (SS-D) no ERV<o:p></o:p></span></p></td><td width=99 valign=bottom style='width:73.95pt;border:none;border-bottom:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;height:60.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>Envelope and OA energy (SS-D) <b>with ERV</b><o:p></o:p></span></p></td><td width=129 valign=bottom style='width:96.6pt;border:none;border-bottom:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;height:60.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>Envelope energy as % of total (LS-D/SS-D) no ERV<o:p></o:p></span></p></td><td width=129 valign=bottom style='width:96.6pt;border:none;border-bottom:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt;height:60.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>Reduction of energy in SS-D due to ERV (at 50% eff)<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>J<o:p></o:p></span></p></td><td width=98 nowrap valign=bottom style='width:73.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>126<o:p></o:p></span></p></td><td width=106 nowrap valign=bottom style='width:79.15pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>222<o:p></o:p></span></p></td><td width=99 nowrap valign=bottom style='width:73.95pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>154<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0.5676<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>0.306<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>F<o:p></o:p></span></p></td><td width=98 nowrap valign=bottom style='width:73.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>112<o:p></o:p></span></p></td><td width=106 nowrap valign=bottom style='width:79.15pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>196<o:p></o:p></span></p></td><td width=99 nowrap valign=bottom style='width:73.95pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>135<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0.5714<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>0.311<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>M<o:p></o:p></span></p></td><td width=98 nowrap valign=bottom style='width:73.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>90<o:p></o:p></span></p></td><td width=106 nowrap valign=bottom style='width:79.15pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>157<o:p></o:p></span></p></td><td width=99 nowrap valign=bottom style='width:73.95pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>101<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0.5732<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>0.357<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>A<o:p></o:p></span></p></td><td width=98 nowrap valign=bottom style='width:73.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>54<o:p></o:p></span></p></td><td width=106 nowrap valign=bottom style='width:79.15pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>82<o:p></o:p></span></p></td><td width=99 nowrap valign=bottom style='width:73.95pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>47<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0.6585<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>0.427<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td><td width=98 nowrap valign=bottom style='width:73.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td><td width=106 nowrap valign=bottom style='width:79.15pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td><td width=99 nowrap valign=bottom style='width:73.95pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>O<o:p></o:p></span></p></td><td width=98 nowrap valign=bottom style='width:73.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>37<o:p></o:p></span></p></td><td width=106 nowrap valign=bottom style='width:79.15pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>52<o:p></o:p></span></p></td><td width=99 nowrap valign=bottom style='width:73.95pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>27<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0.7115<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>0.481<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>N<o:p></o:p></span></p></td><td width=98 nowrap valign=bottom style='width:73.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>67<o:p></o:p></span></p></td><td width=106 nowrap valign=bottom style='width:79.15pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>112<o:p></o:p></span></p></td><td width=99 nowrap valign=bottom style='width:73.95pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>70<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0.5982<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>0.375<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>D<o:p></o:p></span></p></td><td width=98 nowrap valign=bottom style='width:73.35pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>108<o:p></o:p></span></p></td><td width=106 nowrap valign=bottom style='width:79.15pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>187<o:p></o:p></span></p></td><td width=99 nowrap valign=bottom style='width:73.95pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>127<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0.5775<o:p></o:p></span></p></td><td width=129 nowrap valign=bottom style='width:96.6pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=center style='text-align:center'><span style='color:black'>0.321<o:p></o:p></span></p></td></tr></table><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>E.g. in January a 50% eff ERV gives a 30% reduction in heating energy, even though the ‘building’ pre-OA accounts for 55% of the total energy. My gut feeling is that the 55% is not accurate and it is actually lower, but I can’t convince myself using the reports.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Fiddling with the heat recovery control schemes doesn’t seem to change the heating results by much either, however changing the effectiveness has a big impact to the results. In comparison, improving the wall performance has a relatively small impact.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I should say that this is a preliminary model so no design drawings available, and it a retail space with about 0.18 cfm OA/sqft.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:green'>Adam Barker</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:green'>, MBSc, C.E.T., LEED AP BD+C</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:navy'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:green'>Energy Project Manager</span><span style='color:navy'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>Provident Energy Management Inc.</span><span style='color:navy'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>T: 416-736-0630 x 1874 | </span><a href="mailto:abarker@pemi.com"><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>abarker@pemi.com</span></a><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'> </span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-size:7.0pt;font-family:"Verdana","sans-serif";color:#666666'><br>**************************************************************************************<br>This e-mail and any attachments thereto may contain confidential information and/or information protected by intellectual property rights for the exclusive attention of the intended addressees named above. 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