Re: [EnergyPlus_Support] Help

[Niraj Poudel <nirajpdl@xxxxxxxxx>]

The view factor for the roof probably assumes an infinite plane. Hence a 0.5 value. Is what my guess would be.
Niraj

On Wed, Feb 19, 2014 at 3:04 PM, Jeremiah Crossett <<mailto:jcrossett@xxxxxxxxxxxxxxx>jcrossett@xxxxxxxxxxxxxxx> wrote:
>  
> Possibly, but the very quick tests I did showed no noticeable difference when adding a zone with walls and a floor, compared to a roof surface and zone area x height. 
The benefit is a quick model of a roof, and it seems alright, but may look further given your opinion..
> 
> 
> Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203 
 | Mobile 503-688-8951
<http://www.phasechange.com/>www.phasechange.com 
  <http://i.imgur.com/Sldxf.jpg>
> 
> 
> 
> 
> On Wed, Feb 19, 2014 at 12:42 PM, Joe Huang <<mailto:YJHuang@xxxxxxxxxxxxxxxxxxxxxxxx>YJHuang@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>  
>> Wouldn't that foul up the zone heat balance that depends on knowing the view factor or at least the area of each surface ?
>> 
>> Joe
>> 
>> On 2/19/2014 12:37 PM, Jeremiah Crossett wrote:
>>>  
Depending on what you are doing, you might just as well ignore it-- for example if you want the surface to be fully adiabatic then you could remove it, and would get this warning. 
I have some models that are just roofs with zone area, ceiling height and internal loads per square foot-- and it seems to work as expected, but also produces this warning-  
>>> 
>>> 
>>> Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203 
 | Mobile 503-688-8951
<http://www.phasechange.com/>www.phasechange.com 

>>> 
>>> 
>>> 
>>> 
>>> On Wed, Feb 19, 2014 at 12:33 PM, Joe Huang <<mailto:YJHuang@xxxxxxxxxxxxxxxxxxxxxxxx>YJHuang@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>>>  
>>>> "Degenerate surfaces"  sound terrible!  Maybe you should go see a psychologist (just joking :-) )
>>>> 
>>>> Seriously, I suggest you search through your IDF, find the  seven surfaces with less than two vertices (which only define a line and not a surface), and add the missing vertices.
>>>> 
>>>> Joe
>>>> 
>>>> 
>>>> 
>>>> On 2/19/2014 11:58 AM, Oswaldo alonso Guzmán villalobos wrote:
>>>>>  
Hellow, I try to simulate a building, when I simulate it, the energy plus gives the following message,
>>>>> GetSurfaceData: There are 7 degenerate surfaces; Degenerate surfaces are those with number of sides < 3.
>>>>> How fix this error?
Thanks.
>>>>>  
Att. Oswaldo Alonso Guzmán Villalobos
>>>> 
>>> 
>> 
>> 
> 
> 




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