[Equest-users] DOE-2.3 Water Side Economizers - We still need "Non-Integrated"

[Kathryn Kerns via Equest-users]

This is just a thought, but in the past I have used the water side economizer function that appears in the HVAC menus instead of using the water side economizer chiller. I view this function as working the same way as adding a separate DOA for OSA control to each AHU when I really have only one DOA serving many AHUs. You have to be careful to turn some items off, like eliminating the pressure drop for an extra AHU coil, etc., but there are a number of menu selections available to tailor the economizer to your needs.

You might try that.

Kathryn Kerns, LEED AP
Systems Specialist

BCE Engineers, Inc.
P 253.922.0446  |  W bceengineers.com<http://www.bceengineers.com/>
6021 12th Street E, Suite 200, Fife, WA 98424

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Porter, Frederick NOR via Equest-users
Sent: Wednesday, November 23, 2016 10:11 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] DOE-2.3 Water Side Economizers - We still need "Non-Integrated"

All,
It appears that the WSE "chiller" was changed in the beta of DOE-2.3 included with eQ build 7173. It can/will now operate to augment the other chillers ("integrated", "series"), instead of turning off when its capacity is inadequate to meet the loads ("non-integrated", "parallel").

However, the world is full of non-integrated WSEs, and despite certain prescriptive codes, there is still a need to evaluate them for new construction. I tried some Equip Ctrls and Load Mgmts, but these attempts resulted in either simulation errors (inadequate capacity) or the attempted "non-integrated" WSE operating when I didn't want it to. In any case, there may be periods when operators disable WSE operation, so if a CHW EC list does not include the WSE, it should not come on.

There needs to be:

*         clear documentation of how to model the new component with Load Mgmt and Equip Ctrls to perform that way

*         and/or some keywords in the WSE definition to simulate non-integrated operation

*         and/or a separate "non-integrated" WSE "chiller" type

Fred

Fred Porter, BEMP, LEED(c) AP
Principal Engineer
Sustainability Services
NORESCO
fporter at noresco.com<mailto:fporter at noresco.com>
www.noresco.com<http://www.noresco.com/>



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