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Grammy and Nick,<BR>
<BR>
Thank you for your suggestions.<BR>
<BR>
The equation turned out to be very simple.<BR>
<BR>
For centrifugal chiller:<BR>
<BR>
Electrical power consumed (kW)= Operating capacity at current conditions x Corrected electric input ratio/3413 <BR>
<BR>
Best ,<BR>
<BR>
Ana<BR>
<BR> <BR>
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Date: Fri, 5 Nov 2010 19:17:18 +0800<BR>Subject: Re: [Equest-users] Electricity consumption by CHILLER<BR>From: grammy.hkust@gmail.com<BR>To: ananeddav@hotmail.com<BR>CC: equest-users@lists.onebuilding.org<BR><BR><FONT face="comic sans ms,sans-serif">I am also confusing this problem, and I strongly recommend you to read the DOE-2 engineering manual, verison 2.1A, and DOE-2.2 volume 4, which can be downloaded from eQuest web site.</FONT>
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<DIV><FONT face="comic sans ms,sans-serif"></FONT><FONT class=ecxApple-style-span face="'comic sans ms', sans-serif">On page V.35 - V.38, engineering manual, it introduces the electric calculation of chiller, and on page 265, volume4, it introduces the chiller variable list number, you can export the hourly data in eQuest and calculated by hand. I am lost at this step. As i know at this place, there is something you need to notice, the unit of assign loading (1) shall be BTU, and electric demand (12) may be kW, then I still can't get the right number, if you get it, please let me know how.<BR></FONT>
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<DIV class=ecxgmail_quote>On Fri, Nov 5, 2010 at 8:04 AM, Ana N. <SPAN dir=ltr><<A href="mailto:ananeddav@hotmail.com">ananeddav@hotmail.com</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=ecxgmail_quote style="PADDING-LEFT: 1ex; BORDER-LEFT: #ccc 1px solid">
<DIV> <BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">I am trying to calculate/estimate the electricity consumption by a chiller based on hourly outputs. </SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> </SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">First, I plugged the cooling coil load on loop and corrected EIR in the the equitation </SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> Elec= CAP hour* EIR*EIR(t1,t2)*EIR(PLR,dT)/3413 Btu/kW</SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> </SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">but the calculated annual electricity consumption was not even close to the numbers reported under Space Cooling Enduse.</SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> </SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Then, I used PLR and operating chiller capacity at current condition to calculate CAP hour (instead of using the cooling coil load on loop), but calculated numbers did not make any sense.</SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> </SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Has anyone done similar calculations? I am sure I am missing something very simple here, but what?</SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> </SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Any suggestions are very appreciated</SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> </SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> </SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Ana</SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> </SPAN><BR>
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