[Equest-users] EEM vs. new model

[Nick Caton]

By context, I gather by 'baseline' you mean something other than your proposed design, such as an 90.1 Appendix G baseline or similar.

If that's the case, my general advice is that you should much more heavily weight the comparative results using your "actual/proposed" model.  A baseline per above inherently diverges from the actual building materials, lighting power densities, solar load shading, and so forth.  It's not the same building.

Best to choose systems that most efficiently handle your actual project.  Don't get too hung up what works best for an imaginary building ;).

~Nick

[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Matt Clough
Sent: Monday, April 23, 2012 1:59 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] EEM vs. new model

Salutations eQuesters,

I'm doing a simple comparison between a chilled water and DX system.  It would seem that this is a great opportunity to use the EEM, and the simulation predicted that the CHW configuration would be more energy efficient than the DX system.  To be conservative, I also made a copy of the baseline model and changed the system from chilled water to DX.  Using this method, the simulation predicts that the DX system would be more efficient (although not by much).  Which result is most accurate?  The building is a car dealership with a large showroom and an air-conditioned parts storage area.

The geometry and building envelope are not exact, but I made this decision because we are doing this for comparison purposes, so the geometry and construction will be the same.
I have let eQuest autosize both systems.

Sincerely,
Matt Clough
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