[Equest-users] Water-side Economizers NOT on Airside System?

[Aaron Powers]

Cassie,

We have a similar design with water cooled IT racks, and I've had no issue with a dummy system and 0 bhp.  The datacenter space is essentially unconditioned other than the CHW racks, so we don't have the issue with 2 systems serving one zone.

On a side note, I've been able to use the system level module WS-ECONO successfully in a VAVS, which I've never been able to do in previous versions of DOE.  My understanding was this was only available to PSZ and PVAVS  types.  I'm not getting any bdl errors or overwrites, and I'm getting the savings expected from an integrated WSE system.  Is this a new feature in DOE2.2, yet they didn't update the manual?

>From the DOE2.2 Basics Manual
[cid:image003.jpg at 01CB04CA.FE953F90]



Aaron Powers
Project Engineer
_________________________________
Rumsey Engineers | Integral Group

99 Linden Street, Oakland CA 94607
510 663 2070 x 207

apowers at rumseyengineers.com
<mailto:apowers at rumseyengineers.com>www.rumseyengineers.com<http://www.rumseyengineers.com/>
www.integralgroup.com<http://www.integralgroup.com/>
_________________________________

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Cassie Waddell
Sent: Thursday, May 13, 2010 1:47 PM
To: equest-users at lists.onebuilding.org
Cc: Amit Khanna
Subject: [Equest-users] Water-side Economizers NOT on Airside System?

We are designing an integrated water-side plant to serve cold water directly to IT racks (No air). We're projecting that at 65F water temperature, we should get more than 65% compressor-free cooling.

The current modeling approach it to build a dedicated cooling system (chiller, cooling tower, associated loops) with a direct load placed on the loop. We are having difficulty in determining whether or not we can model a water-side economizer using this approach because the water-side economizer is specified within the air system (which we have none). The issue in eQuest is how to introduce water-side economizer in a secondary loop that only serves process loads and no zones? Is the correct way to build a dummy zone and system and zero-out the fan power?

Any ideas?
________________________________
Cassie Waddell
Mechanical Engineer, LEED(r) AP
Arup
560 Mission St, Seventh Floor
San Francisco CA 94105
tel: 1 415 946 1660
fax: 1 415 957 9096
cassie.waddell at arup.com<mailto:cassie.waddell at arup.com>
www.arup.com


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