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Re: [EnergyPlus_Support] Unmet heating load in Design builder



There is a known issue in e+ that is hopefully going to dissappear in the next release that will solve a current issue where extra load from air introduced under zone heating setpoint from the AirLoop, does not count toward zone heating load during sizing. You can manually calculate the difference and insert an extra internal load scheduled only during sizing days.  

Mit freundlichen GrüÃ?en- Sent from my iPhone (excuse the brevity)
i. A.
Jean Marais
b.i.g. bechtold
Tel.   +49 30 6706662-23

On 04.02.2015, at 15:37, "'Edward G. Lyon' eglyon@xxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

We are having some issues with unmet hours also.  Our systems are autosized, so there must be some issue with the autosize routines.  We have to identify the offending zones and make some manual changes to get by.  But you should also check your controls, set points, and schedules for errors or ommisions.

 

Ned Lyon, P.E. (MA, WV)
Staff Consultant

SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct 
617.285.2162 mobile 
781.907.9009 fax
www.sgh.com

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Wednesday, February 04, 2015 8:47 AM
To: EnergyPlus_Support
Subject: [EnergyPlus_Support] Unmet heating load in Design builder [1 Attachment]

 

 

I observed large unmet heating load in designbuilder ~2000. The system is pretty standard VAV with reheat. I don't have this problem with Openstudio. So I don't know if anyone using designbuilder has this problem before. I attached the E+ file that was generated by DB.

Also, I don't know if there is a way to properly set a VAV to be 100% outdoor air in DB.

 

Your help is much appreciated.

 

HJ

 



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Posted by: "jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx>


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