[EnergyPlus_Support] Re: Building Meets Design Day But Not Weather File?

["noelcrrl" <noelcrrl@xxxxxxxxx>]

Problem Solved.

It seems that this problem is caused by the fact that the design day 
(7/21) for the south zones does not have the same sun exposure to the 
zones as any day in the shoulder months.  In fact, it is far less.  
Therefore, when the building is exposed to the high solar heat gain 
on the south zones during September and October, the HVAC system 
cannot maintain temperature for these zones.  I have solved this 
problem by adding a second summer design day with a different date 
(10/31) that has a higher solar heat gain for the south zones.  This 
seemed to do the trick.  Now the south zones operate between the 
setpoints.



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "noelcrrl" <noelcrrl@...> 
wrote:
>
> All-
> 
> All-
> 
> I have created a building model representing an office.  The model 
> meets the heating and cooling temperature setpoints, 70F and 75F 
> respectively, for both the winter and summer design days, according 
> to the ESO.  However, when I run the weather file, the temperature 
of 
> the south zones cannot be maintained at setpoint and drift beyond 
75F 
> between 10am and 4pm during the shoulder months (i.e. September and 
> October) consistently (on a daily basis).  Has anyone ever 
> encountered this problem in the past?  What could be causing this?  
> Thanks in advance for your help.
> 
> Additional Info:
> Simulation takes place in Houston
> Occupancy (6am - 6pm)
> Fan Schedule (5am-6pm)
> Setback (6pm-5am) Temps: 55F (heating) and 90F (Cooling)
> Design Day-temps do not setback
> 
> Noel
>




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