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

[David Eldridge]

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> 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: 
> Review monthly consumption
> I haven't used equest but assume you can review hourly air temps and loads, so compare these next.
> 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
>> 
>> 
>> _______________________________________________
>> Bldg-sim mailing list
>> http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
>> To unsubscribe from this mailing list send  a blank message to BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG
> 
> -- 
> Chris Yates C Eng MCIBSE
> 
> Building Physics Consultant
> 
> Tel:   +447960731576
> 
> Email: chris.malcolm.yates at gmail.com
> 
> Skype: christopher.m.yates
> 
> _______________________________________________
> Bldg-sim mailing list
> http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20110216/d87ad244/attachment-0001.htm>