Re: [EnergyPlus_Support] The wierd results of cooling load rate.

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

Thermal mass effects could result in a higher cooling rate for the entire 
occupied period.  Compare the sum of the cooling load across the entire 24 hour 
period.  You should see that the 24-hr cooling load is less in the night 
setback case.

Other factors to consider in such a comparison:  does the HVAC system have an 
outside air inlet?  If so, it the fan continuous or cycling?  Are you comparing 
"Zone/Sys Sensible Cooling . . ." or the coil load?

If you are not able to explain this, please upload the two input files to the 
files area in the yahoo group or send as a zipped attachment to energyplus-
support@xxxxxxxx

Mike


On 23 Apr 2007 at 22:15, xjtu.guowei wrote:

> Dear All:
> 
> I have run the simulation for two models. The only difference between
> them is the thermostat schedule. 
> The first one is 75F(Cooling) for the all time during the day; the
> other one is 75F(6:00AM-5:00PM)and 80F (the rest time of the day),
> which is sort of like nightsetback. People is in the zone from 7AM-5PM.
> From my analysis, for the second model,the cooling load rate will be
> going up around 7Am and go back to almost the same values as the first
> model. 
> 
> But from the results I got, during the period of 7AM-5PM, the second
> model's cooling load rate is about 20%-15% highter than the first
> model, which didn't make any sense to me. I am wondering if there is
> anything wrong with E+ or my model? Please help me to figure it out.
> By the way, I checked the heating load rate which made sense to me.
> 
> Thank you in advance.
> 
> Wei
> 
> 
> 
> 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.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


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





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