[Bldg-sim] eQuest/DOE2 instantaneous loads

[Matthew Higgins]

Is it also safe to say that the eQuest Loads are not the same as the 
loads that would be calculated by a load calculation program (i.e. 
Trane, Carrier, etc.)? The primary differences laying in the way that 
eQuest calculates effective R-Values vs. nominal for assemblies and uses 
a 30-year average weather file rather than degree days. And if I'm not 
mistaken, coincident vs. non-coincident cooling-heating has a role in 
the loads as well.

Matthew Higgins, Associate
LEED AP + ASHRAE-HBDP

Environmental Dynamics, Inc.
Architecture and Sustainability Consulting Services
505.242.2851 x.103
web. edi-arch.com

Any data provided by the Consultant, verbal or written, are to be considered opinions of building energy and/or daylight performance. The Client understands that the Consultant has no control of occupant habits, equipment or material performance or characteristics, site or climate conditions or the Contractor's method of assembly, and that the Consultant's opinions regarding building energy/daylight performance are made on the basis of the Consultant's professional judgment and experience. The Consultant makes no warranty, express or implied, that the energy/daylight performance of the building will not vary from the Consultant's opinion of building energy/daylight performance.

Joe Huang wrote:

> James,
>
> There are two sets of loads in DOE-2, in both the LOADS and SYSTEMS 
> routines. Make sure you're looking at the SYSTEMS loads, not the LOADS
> loads.
>
> Joe Huang
> White Box Technologies, Inc.
> 346 Rheem Blvd. Suite 108D
> Moraga CA 94556
> YJHuang at whiteboxtechnologies.com
>
> James Lo wrote:
>
>> Hi there,
>>
>> Just joined the group and I am glad there are people out there as 
>> curious about building simulations.
>>
>> That said, I have a questions regarding getting instantaneous loads 
>> from DOE2 using eQuest. Here in the University of Texas we are 
>> currently trying to do a parametric study on effects of varying 
>> temperature set-point and occupancy. Pretty much we are changing the 
>> occupancy schedules and set points in the HVAC setup and see what 
>> happens (for a specific test building).
>>
>> While we are getting decent HVAC electricity consumption outputs 
>> (which somewhat fit our expectations), we were not able to get the 
>> simulated instantaneous loads for a zone... Say if I have a cooling 
>> zone with the set point changed from 75F to 80F, the increased indoor 
>> temperature should decrease the conduction load and ultimately reduce 
>> the energy used for cooling.
>>
>> We are seeing the energy reduction, but all the "loads" stay the same 
>> no matter which parameters we are looking at in the report.
>>
>> I believe I read it somewhere that all the "loads" in DOE2 are design 
>> loads for a specific building material/weather then they modified for 
>> the load for set points and occupancy, that's why when there is no 
>> material changes, the loads stay the same, is that true?
>>
>>
>> The bottom line is we will need to somehow figure out how much the 
>> external load reduction is when we adjust set point and occupancy.
>>
>> Thanks for the help!
>>
>> - James
>>
>>
>> L. James Lo, Doctoral Candidate
>> Center for Energy & Environmental Resources
>> University of Texas at Austin
>> 10100 Burnet Rd. Bldg. 133 Rm 1.302C
>> Austin, TX 78758
>> Phone: (512) 699-9480
>> ljameslo at gmail.com
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