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Re: [EnergyPlus_Support] jEPlus & Window-to-wall ratio



Amer, 
For the decrease in cooling energy consumption when increasing window area- 

Are your windows oriented towards south (northern hemisphere?) if so I suspect that the issue may be chiller part load values; something I am not sure if E+/Design Builder default curves handle like a real chiller would.Check for a warning about part load values- also try with ideal loads system to see if your cooling loads still decrease with added window area.  The chiller objects in Energy Plus are remnants of DOE2, from what I understand have not been updated. They can cause the cooling system to use more energy when decreeing the load due to the system running less efficiently under less load. This would make since if the system size and the curve where locked in place, but not so if the system is autosized.
It may be worth the effort to submit this to the help desk to see what they think..


Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
 

  






On Thu, Aug 30, 2012 at 9:36 AM, Amir <amirhosein_ghoreishi@xxxxxxxxx> wrote:
 

You guys are great. Jeremiah, you were right. The problem was with the lighting control, which when was unchecked in the Design Builder model, the jEPlus worked for all WWR(s) just fine. Now, for all hot and cold locations, as the WWR(s) increase, the cooling energy seems to decrease, which is a bit odd. I thought it might have sth to do with the lack of daylight control but not sure yet.

About the partitions, I have three different layouts, with central and split circulation cores, which is basically a re-arrangement of interior partitions. In other word, the change of geometry. You had some comments on this before and how the change of geometry could be accounted for as a variable using jEPlus. I would be grateful If you could explain a bit further,

Niraj, I'd thoroughly review your example and probably get back to you with some questions :-)

Thanks again fellows,




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