[Equest-users] Electricity consumption by CHILLER

[Ana N.]

Grammy and Nick,
 
Thank you for your suggestions.
 
The equation turned out to be very simple.
 
For centrifugal chiller:
 
Electrical power consumed (kW)= Operating capacity at current conditions x Corrected electric input ratio/3413   
 
Best ,
 
Ana

 


Date: Fri, 5 Nov 2010 19:17:18 +0800
Subject: Re: [Equest-users] Electricity consumption by CHILLER
From: grammy.hkust at gmail.com
To: ananeddav at hotmail.com
CC: equest-users at lists.onebuilding.org

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.


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.




On Fri, Nov 5, 2010 at 8:04 AM, Ana N. <ananeddav at hotmail.com> wrote:


 
I am trying to calculate/estimate the electricity consumption by a chiller based on hourly outputs. 
 
First, I plugged the cooling coil load on loop and corrected EIR in the the equitation 
 Elec= CAP hour* EIR*EIR(t1,t2)*EIR(PLR,dT)/3413 Btu/kW
 
but the calculated annual electricity consumption was not  even close to the numbers reported under Space Cooling Enduse.
 
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.
 
Has anyone done similar calculations? I am sure I am missing something very simple here, but what?
 
Any suggestions are very appreciated
 
 
Ana
 

  

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