Re: [EnergyPlus_Support] load problem

["Michael J. Witte" <mjwitte@xxxxxxxx>]

What you have done should be working.  The outside air option in Purchased Air 
is only useful for a peak load calculation, otherwise for what you are doing, 
INFILTRATION is the best approach to add an outside air load.  The purchased 
air cooling load should increase when there is additional heat gain introduced 
by infiltration.

Turn on the report variables for infiltration heat gain and heat loss to 
determine where the problem is.  If these are zero during the cooling seaon, 
then check the schedule and the coefficients on the infiltration object.

When modeling a full system, such as a VAV system, then outside air should be 
introduced through an outside air system component with a mixing box and 
outside air controller (see 5ZoneAuto.idf example file, and others).

Mike


On 23 Aug 2005, at 11:16, eplus2005 wrote:

> Dear all,
>    I want to gain the load of building model.I divided the building 
> load to three parts as follows:
>    1.load produced by outside environment;
>    2.load produced by space gains(people,lights,electric equipment);
>    3.load produeed by outside air.
> 
>    According to the load parts,i created three models.The first case 
> has only building informationg.The second adds the space gains and 
> the third adds the outside air.
> 
>    But i found that whether or not add  outside air,the cooling load 
> did't change,it just adds the heating load.(Why?)
> 
>    All cases use the purchased air.Otherwise,i'm puzzled for the load 
> produced by outside air.i don't know where to define the outside 
> air,so i use the infiltration instead(Is it reasonable?).In Each 
> case,I use the variable values Purchased Air Cooling Rate as load 
> values(is it reasonable?)
> 
>    If i don't want to use infiltration or ventilation,then how can i 
> get the load produced by outside air and how to define?If i use a 
> real system(e.g VAV),how should i define the outside air volume and 
> get the load it produced?
> 
>    Thanks in advance! 
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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