Re: [EnergyPlus_Support] internal heat gain and building material

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

Certainly the level of internal gains will alter what fraction of the 
total cooling load is impacted by changes in the building envelope 
materials.  I would have expected a smaller change in cooling load 
for the commercial building, but you show a larger change.  Are there 
differences in the amount of glass in these two buildings?

Mike


On 24 Jul 2003, at 23:03, HSIEH Chun-Ming wrote:

> Hello, 
> 
> I have a question about how the energyplus calculate the heat
> mechanism between internal heat gain and building material. 
> 
> There are two bulidings here, in which one is commercial building with
> heavy internal heat gain (people, lights and equipment), and the other
> one is residential building with much lower internal heat gain as
> compared to the commercail case. Except the internal heat gain
> setting, other settings were almost the same, including the material,
> air system type and so on.
> 
> In order to reduce the heat rejection from air conditioners during the
> daytime, I tried to change the wall and roof material to the material
> with lower thermal transmittance (U value)in both cases. 
> 
> But, the simulation results showed that the mitigation improvement (
> the reduced heat rejection ) was about 3% and 7% during the daytime (
> 06:00-18:00)in residential and commercial buildings respectively. 
> 
> I wonder what is the actual reason that caused the 4% difference. The
> internal heat gain? if it is the reason, how the energyplus calculate
> it? The temperature setting was set to 25C and Timestep in hour was
> set to be 6 in both cases.
> 
> Thank you very much. 
> 
> Chunming 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> ------------------------ Yahoo! Groups Sponsor
> ---------------------~--> Free shipping on all inkjet cartridge &
> refill kit orders to US & Canada. Low prices up to 80% off. We have
> your brand: HP, Epson, Lexmark & more.
> http://www.c1tracking.com/l.asp?cid=5510
> http://us.click.yahoo.com/GHXcIA/n.WGAA/ySSFAA/dkFolB/TM
> ---------------------------------------------------------------------~
> ->
> 
> To unsubscribe from this group, send an email to:
> EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> 
> 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 are of the Support Web Site.
> 
> 
> 
> 
> 
> 
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/ 
> 



========================================================
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx


------------------------ Yahoo! Groups Sponsor ---------------------~-->
Free shipping on all inkjet cartridge & refill kit orders to US & Canada. Low prices up to 80% off. We have your brand: HP, Epson, Lexmark & more.
http://www.c1tracking.com/l.asp?cid=5510
http://us.click.yahoo.com/GHXcIA/n.WGAA/ySSFAA/dkFolB/TM
---------------------------------------------------------------------~->

To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

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 are of the Support Web Site.




 

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/