[Bldg-sim] Two Questions for the esteemed members of this fine list

Jim Dirkes jim at buildingperformanceteam.com
Sat Sep 20 12:29:31 PDT 2014


1.       EnergyPlus can do this with one proverbial hand tied behind its back.  (You, however, will need both hands)

2.       I am unaware of a specialized tool.

James V Dirkes II, PE, BEMP, LEED AP


Energy Analysis, Commissioning & Training Services

1631 Acacia Drive, Grand Rapids, MI 49504 USA

616 450 8653

-----Original Message-----
From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of RobertWichert
Sent: Saturday, September 20, 2014 3:25 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Two Questions for the esteemed members of this fine list

I am working on modeling a small computer room.  The computers are the major load.  The space is served by a small water cooled chiller and an air handler, with economizer.  The questions are:

1)  Does EnergyPlus lend itself to such models, and are there specific tools that might be useful?  I am interested in accurately modeling the computer with varying loads over the year, and with the economizer enabled to show the difference in various supply air temperatures and cooling tower strategies (multiple versus one cooling tower, variable versus multiple fans) as well as various economizer strategies (return air versus supply air control and the resulting chiller loading).  I am also interested in detailed chiller modeling, as the load varies from full economizer to full chiller and the chiller part-load performance is a key attribute. The chiller supply temperature will be higher than typical for chilled water coil cooling, so that must be flexible as well.

2)    Is there any specialized modeling tool that anyone knows about

that is especially good for such modeling?  I would instinctively say EQuest is NOT good for that, but I may be mistaken.  I could make EnergyPro work, but I do not believe that the cooling tower / chiller interface is detailed enough using DOE.2.

Your thoughts are appreciated.



Robert Wichert P.Eng. LEED AP BD&C



+1 916 966 9060

FAX +1 916 966 9068



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