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



Good solution! Depending on the building, it is sometimes wise to add 
extra "solar"
design days. People even add a high solar winter design day sometimes to 
capture the effects
of low sun angle on south exposures.

Fred

noelcrrl wrote:
> 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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>
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>  
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>
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>
>   


[Non-text portions of this message have been removed]



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