[Equest-users] The DES Dilemma

[Kelsey VanTassel]

I don't understand. Why can't you follow Option 1?
Without DES, your baseline system would normally be System 3-PSZ w/furnace and DX, right? Since your proposed design uses district heating and cooling, the baseline System 3 is changed to 4-pipe CV AHU. The DES procedure does not change your proposed systems.
Kelsey Van Tassel
Mechanical Engineer | kvantassel at sustaineng.com<mailto:kvantassel at sustaineng.com>
608.836.4488 ext. 20 | Fax: 608.836.4477

Sustainable Engineering Group
901 Deming Way, Suite 201
Madison, WI 53717
www.sustaineng.com<http://www.sustaineng.com/>


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Arpan Bakshi
Sent: Friday, April 22, 2011 4:01 PM
To: equest-users
Subject: [Equest-users] The DES Dilemma

PROJECT BACKGROUND
Building Area
Less than 25,000 SF

Proposed Design
TDV, DOAS, Supplemental Radiant Heating/Cooling

Heating and Cooling Generation
University District Heating and Cooling


THE DES DILEMMA
Reference - Treatment of District or Campus Thermal Energy in LEED V2 and LEED 2009 - Design & Construction


Option 1 (Building stand-alone scenario)

The downstream equipment of both baseline and proposed models cannot be easily isolated by tying chilled and heating hot water loops to meters since the baseline building is System 3, and does not use water-side systems. Neither can proposed model systems be replaced by "4-pipe CV AHU" per DES Table 3 (is that a typo?) since the downstream radiant systems need a water-side source of heating and cooling in the model.


Option 2 (Model for Aggregate Building / DES Scenario)

This option has a points floor of 6 for LEED NC v2009. We do not anticipate a maximum of 1-3 points due to envelope design inefficiencies. Therefore this project would not qualify for Option 2.

ANY THOUGHTS?

I'm tempted to model System 7 heating and cooling plants for both baseline and proposed models and call it even, cost-neutral. What would you suggest?
--



Arpan Bakshi  LEED AP BD+C

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