[Equest-users] Receptacle Energy

Fred Porter FPorter at archenergy.com
Wed Apr 22 06:11:50 PDT 2009

For lab plug load info, go to http://www.epa.gov/lab21gov/toolkit/bp_guide.htm and download the "Measured Peak ....pdf, and "Right Sizing....pdf." 
And at http://www.epa.gov/lab21gov/toolkit/index.htm see the "Benchmarking " link for end-use site energy, and the "Laboratory Equipment Efficiency Wiki," if you have any influence over purchasing the equipment.
If the building is half lab I would be very surprised if the non-receptacle TDV energy is only 170 Btu/sf even in balmy CA. (TDV is a type of power plant input energy for the non-CA reader.) 
Note that modeling lab airflow and exhaust fans is a bit tricky in DOE2 and its not hard to underpredict. There are a few different approaches and the appropriate one is dependent on the proposed and baseline designs.  
In particular, even if the lab exhaust airflow is VAV, these exhaust fans are usually CV/bypass which is not the DOE2/eQuest default. And the exhaust fan power should be derived from manufacturer's sheets or the fan hp on the mech schedules. Using static pressure and assumed typical fan efficiency may underpredict fan power in many cases because of the nozzle losses, particularly if "high plume dilution" fans is used. 
>>> steven rutter <stevenrutterjr at gmail.com> 4/21/2009 4:24 PM >>>
I am trying to model a 2-story college going for LEED. The building contains several differernt lab rooms which includes a lof of equipment (Approximately 26W/ft^2 for half of the building). After running the simulation, the preliminary report states that the annual TDV Energy Use Summary for the entire building is 847.95 TDV-kBtu/sqft-yr with 684.71 towards the receptacle energy. Trying to get the minimum 14% energy cost savings is almost impossible with this receptacle energy. What options do I have to reduce the Receptacle Energy in order to meet criteria for LEED points? Is there somewhere I can input this heat load so it does not have such a great impact on the energy use summary report and still have an accurate model of the building? 
-Steven Rutter
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