[Bldg-sim] Energy consumption difference in E+ and Equest

[Chandan Sharma]

Not sure how much this would be of help but the following link provides 
comparison of EnergyPlus results with analytical results and also 
comparison with the results of other simulation tools.

http://apps1.eere.energy.gov/buildings/energyplus/energyplus_testing.cfm

Don't know much about it but it may give you some idea about what the 
energy simulation results are with different simulation engines and also 
as compare to analytical results.

Regards,

Chandan

On 2/16/2011 7:14 AM, David Eldridge wrote:
> If you haven't done this already, I would suggest comparing the other 
> annual end-uses for the models as well.
>
> If cooling is the only one varying then you have some questions about 
> specific inputs.  (equip efficiency, infiltration, etc.)
>
> However, if all of the end-uses are varying between the two models 
> then you'll have a wider group of inputs to consider. (internal gains, 
> occupancy, envelope construction, etc., plus those above.)
>
> -DSE
>
> Sent from my iPhone
>
> On Feb 16, 2011, at 5:07 AM, Chris Yates 
> <chris.malcolm.yates at gmail.com <mailto:chris.malcolm.yates at gmail.com>> 
> wrote:
>
>> Vaibhav
>>
>> Sorry to nit pick... don't you mean kWh/sq.m/year?
>>
>> It's difficult to say what you're discrepancy comes from without 
>> having the models.
>> All I can recommend is reviewing both model's results at successively 
>> deeper levels detail. You've already covered the first level of 
>> detail - the cooling consumption doesn't match.
>> Your next courses of action may be:
>>
>>    1. Review monthly consumption
>>    2. I haven't used equest but assume you can review *hourly *air
>>       temps and loads, so compare these next.
>>    3. Solar gain
>>
>> Are your figures based on zone demand or plant? You've got quite a 
>> few layers to compare.
>>
>> Cheers
>>
>> Chris
>>
>> On 16/02/2011 06:49, Vaibhav Jain wrote:
>>> Hello,
>>>
>>> We are trying to compare cooling energy consumption of a typical 
>>> office building model in EnergyPlus and eQUEST. Simulation model is 
>>> a simple 5 zone model with PTAC system. Climate is New Delhi. 
>>> Heating consumption is near zero in both the models. We tried our 
>>> best to closely match models in these two software. The result says, 
>>> cooling electricity consumption/sq.m./year is about- 35 
>>> KW/sq.m./year (in Energyplus) and 100 KW/sq.m./year (in Equest). 
>>> Some of the guidelines says that cooling consumption should be 
>>> around 100-120KW/sq.m./year. Is this correct? Does any one has come 
>>> across this phenomenon.
>>>
>>> Why EnergyPlus is giving very less consumption as compared to Equest 
>>> or references?
>>>
>>> Thanks & regards,
>>> Vaibhav Jain
>>>
>>>
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>>
>> -- 
>>
>> Chris Yates C Eng MCIBSE
>>
>> /Building Physics Consultant/
>>
>> Tel:+447960731576
>>
>> Email: chris.malcolm.yates at gmail.com 
>> <mailto:chris.malcolm.yates at gmail.com>
>>
>> Skype: christopher.m.yates
>>
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-- 
Chandan Sharma
Assistant Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703

Phone :  (321) 633-2205
Fax   :  (321) 638-1439
e-mail:  mailto:csharma at fsec.ucf.edu
Visit our web site at: http://www.fsec.ucf.edu

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