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

[JRR <energy.wwind@xxxxxxx>]

John wrote:

How do you decouple the floor from the ground??? :-P
i-n-s-u-l-a-t-i-o-n.......   sorry just couldn''t help myself.......
I have a large pink panther in the cab of my truck and
"beware of panther" decals on the windows...................... :-)

Daniel Solís wrote:

>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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