[Trace-users] Cooling Only (Design) Schedules and LEED Energy Modeling

[Jason Dietterick]

Ben,

I don't think there is necessarily a problem using this schedule as far as LEED goes, but I think you are hurting yourself by doing so.  By making all loads 100% 24/7 you will drive energy consumption way up and dilute potential savings with high annual costs.  LEED requires that systems cycle with occupancy and using this schedule indicates that all spaces are occupied all the time, therefore systems will run all the time.  This schedule is ideal for load calculations as it presents you with a worst case scenario... 100% of loads for cooling and 0% for heating, however this will likely never be the case during actual operation.  Personally, I like to create my own schedules that still include 100% 24/7 for cooling design, but weekday/weekend schedules that reflect actual occupancy.  Keep in mind that heating design should always be zero, as you don't want people/light/receptacle loads to help heat the space when designing for worst case scenario.  Ventilation schedules however should be set to 100% for heating design however, as this needs to be factored in for your heating worst case scenario.

Hope that helps!

Best,
Jay

Jason Dietterick
Associate, Energy Modeler
The Stone House Group
DIRECT DIAL 484.548.4007


301 Broadway Ave
Bethlehem, PA 18015
Tel 610.868.9600
Fax 610.868.2272

From: trace-users-bounces at lists.onebuilding.org [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Ben
Sent: Monday, September 16, 2013 11:16 AM
To: trace-users at lists.onebuilding.org
Subject: [Trace-users] Cooling Only (Design) Schedules and LEED Energy Modeling

I am working on an energy model for a LEED project using Trace, it's my first one, and I was going through the error comments Trace generates and I saw a warning about using the Cooling Only (Design) schedule. Essentially the warning was that ASHRAE requires schedules to be reflective of actual occupant uses, and cooling only schedules wouldn't be realistic.

I use this schedule all the time when using Trace for HVAC loads but I'm nervous now using it from energy modeling. Will this get me a review comment if a reviewer see's that I used this schedule, or is this schedule pretty typically used in an energy model?

Thanks.

[cid:image001.png at 01CEB2CF.65618F70]
Ben Hollon, EIT, LEED(r) AP BD+C, MBA
email:  bhollon at antella-inc.com<mailto:xxxxxx at antella-inc.com>
Cell (816) 536-3434 * Tele:  (816) 421-0950 ext. 104


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