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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'>Michael,<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'>The weather file is representative of the area, and I did run an auto sized load, which calculated heating and airflow capacities much higher than what was specified (about 3x higher on average off the top of my head).<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'>You raise a good point regarding de-stratification – reduced stratification is another claim the company boasts, as the building is pressurized. The claim to cut ACH due to infiltration in half. I believe the team is looking into reducing the # of de-stratification fans in response to this. I searched the forums for how to model de-stratification about 2 weeks ago and came up with a few threads basically hinting that it can’t be accurately done. Does anyone have a different opinion, or know if a way where this can at least be approximated? I want to avoid playing with the infiltration rates as I do not believe that is acceptable for a LEED model (at least here in Canada it isn’t). As of now I have not modeled this effect.<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'>The combustion problem is somehow managed through some limited venting, though I can’t remember exactly what is going on, which is why I called them ‘direct’ fired units.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><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'>, 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'>Sustainability 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 | <a href="mailto:abarker@pemi.com">abarker@pemi.com</a> </span><span style='color:#1F497D'><o:p></o:p></span></p></div><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"'> Busman, Michael R [mailto:MBusman@chevron.com] <br><b>Sent:</b> Thursday, August 09, 2012 4:40 PM<br><b>To:</b> Adam Barker; 'equest-users'<br><b>Subject:</b> RE: Cambridge direct fired units in warehouse space<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Adam,<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 haven’t had any experience with the Cambridge unit, nor am I able to answer your question about the unmet heating hours. Have you tried auto-sizing just for a cfm and Btuh capacity comparison with the mech engineer’s load calc? Also, is the weather file representative of the warehouse location?<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'>Because the building is a warehouse, it triggered a question in my mind that somebody else might be able to answer. That is if eQUEST models thermal stratification in high bay areas such as warehouses or hangars? If so, it may calculate unmet hours on the coldest days near floor level and a nice warm temperature at ceiling/roof level. Just a wild thought.<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'>Mike Busman<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>Michael R. Busman, CEM</span></b><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>Lead Project Engineer II</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'> <o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>Chevron Energy Solutions</span></b><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>A Division of Chevron U.S.A., Inc.</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>145 S. State College Blvd.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>Brea, CA 92821 </span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>Direct 714-671-3561</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>Fax 714-671-3438</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>eFax 866-420-0335 (Include my Full Name followed by "CAI:MHTZ" on Cover Sheet)</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>Mobile 310-387-2083</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'><a href="mailto:mbusman@chevron.com">mbusman@chevron.com</a></span><span style='color:#1F497D'><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'><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"'> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> <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, August 09, 2012 1:07 PM<br><b>To:</b> 'equest-users'<br><b>Subject:</b> [Equest-users] Cambridge direct fired units in warehouse space<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hello everyone,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I was recently asked to model the impact of Cambridge ‘direct’ fried air handling units for a warehouse building compared to a conventional MUA with supply and exhaust. Has anyone had experience with these units?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>They boast a very low fan power consumption (5 hp for 8565 cfm of air), 92% thermal efficiency, and a temperature rise and max discharge temp of 160 F.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Most of the inputs are straightforward however I am not sure I am modeling the 160 F temperature rise properly. As of now I have Packaged Single Zone systems and have entered 160 F as both the ‘zone entering max supply temp’ and ‘hot deck max leaving temp’. Would this fully capture that temperature rise? I ask as I am getting about 150-200 unmet heating hours in these zones, even though all other inputs are as per the mechanical engineer. Is this significant, or likely just the difference between how eQuest and the mechanical engineer size their loads? The building is a cold climate (southern Ontario, Canada) LEED building, so I want to make sure I am modeling as much benefit as possible.<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'>, 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'>Sustainability 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 | <a href="mailto:abarker@pemi.com">abarker@pemi.com</a> </span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>