<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Venti 9won't try the rest);</DIV>
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<DIV>With increased fan efficiency, less HP is required to move the air. Less HP means less motor heat. That is made up in gas heating.</DIV>
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<DIV>Make sense?</DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Venkataramakrishna P <venkataramakrishna.p@tcs.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> equest-users@lists.onebuilding.org<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Fri, March 25, 2011 2:12:20 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Equest-users] increased fan eff-increased gas consumption - problem.<BR></FONT><BR><BR><FONT size=2 face=sans-serif>Dear colleagues,</FONT> <BR><BR><FONT size=2 face=sans-serif>I wanted to see how Total Electricity and Total Natural Gas Consumption (furnace) vary with various hvac system parameters. 9 parameters both on cooling side and heating side were considered and I have varied each of these parameters individually keeping others constant and observed how Tot-Elec and Tot-Nat-Gas consumptions vary with them. The system under study was a simple packaged single zone system with DX coils and a furnace fueled by
natural gas for Abbotsford (Canada) climate. </FONT><BR><BR><FONT size=2 face=sans-serif>Surprisingly, when the supply fan efficiency alone was varied, increase in efficiency resulted in increased consumption of total natural gas. Total electricity variation was normal with fan efficiency. Also, increased CFM resulted in reduced total natural gas, while I believe these results are supposed to be in the other way.</FONT> <BR><BR><FONT size=2 face=sans-serif>Even after a lot of brainstorming, I could not figure out what is happening and what is that I am missing.</FONT> <BR><BR><FONT size=2 face=sans-serif>I am attaching the excel file containing these data herewith. Sheet1 has Total Natural Gas vs. Supply fan eff. data; and Sheet-2 has Tot-Nat vs. CFM.</FONT> <BR><BR><FONT size=2 face=sans-serif>Please suggest/correct me on what I was missing here.</FONT> <BR><BR><FONT size=2 face=sans-serif>Thanks a lot in advance!</FONT> <BR><BR><BR><BR><BR><BR><FONT
size=2 face=sans-serif>Venkata Ramakrishna P<BR>Tata Consultancy Services<BR>Chennai - 600113.<BR>Phone : +91 44 66160010<BR>e-mail: venkataramakrishna.p@tcs.com<BR>Website: </FONT><A href="http://www.tcs.com/" rel=nofollow target=_blank><FONT size=2 face=sans-serif>http://www.tcs.com</FONT></A><FONT size=2 face=sans-serif><BR>__________________________________________<BR>Experience certainty.<BR>IT Services, Business Solutions, Outsourcing<BR>__________________________________________</FONT><PRE style="WHITE-SPACE: normal">=====-----=====-----=====<BR>Notice: The information contained in this e-mail<BR>message and/or attachments to it may contain <BR>confidential or privileged information. If you are <BR>not the intended recipient, any dissemination, use, <BR>review, distribution, printing or copying of the <BR>information contained in this e-mail message <BR>and/or attachments to it are strictly prohibited. If <BR>you have received this
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