[EnergyPlus_Support] Re: I add a window, but the temperature inside the building doen't change

[Daniel Solís <danielsolis79@xxxxxxxxxxxx>]

How do I decouple the floor from the ground? 

Physically, would it make sense to decouple them? (I ask because in 
the documentation says the temperatures obtained by the Slab and 
Ground Temperature Programs are so that E+ already partially 
decouples the ground and the slab, so that it fixes some problems).

I still don't get one thing. You say the temperature inside the 
shoebox doesn't change because the ground temperatures under the slab 
are characteristic of a conditioned space, so they drive the 
simulation and the window has a U-value similar to the one in walls. 

But, most of the energy (in the day) entering the shoebox through the 
window is via radiation, not convection. 

And, the ground 'conditions' the room so quickly that the radiation 
entering through the window has no time to change the inside 
temperature?


Thanks

Daniel

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@...> wrote:
>
> The shoebox is unconditioned, but the ground temperatures under the 
slab are 17-
> 21C which is representative of a conditioned space.  So, the ground 
> temperatures are driving the entire simulation for this model.  The 
window is 
> small and it has similar thermal properties to the exterior walls 
(window u-
> value=6, wall u-value=4).  To see the impact you expect, either 
change the 
> ground temperatures, or decouple the floor from the ground.
> 
> Mike
> 
> 
> On 2 Oct 2007 at 19:45, Daniel Solís wrote:
> 
> > I'm newbie in e+, so I started simulating a shoebox-shaped room. 
Then, 
> > I added a window (single 6mm clear glass, 1m2) facing to the 
south. 
> > When I compare the temperature in the inside with and w/o the 
window, 
> > it's almost the same (few hundreths of difference), which doesn't 
make 
> > sense.
> > 
> > I uploaded the file, it's Odon3.idf
> > 
> > 
> > Thanks
> > 
> > Daniel Solís
> > 
> > 
> > 
> > 
> > 
> > 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@...
>




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