Re: [EnergyPlus_Support] high surface temperature

[Hannah Yan <hannahyan@xxxxxxxxx>]

Rick,

Thank you for the offer. See the attached file.

Let me explain the situation a little bit. For the
west and east exterior walls, I used 4 inch brick
outside and 3 inch insulation inside. South, north
walls and floors are interior walls. Ceiling is
exposed to outside weather. 4 cooling design days are
simulated. For the hottest day (1st day), at the cool
night(25C outside), MRT in the room arrives 35C. At
the hottest time, the south wall and west wall are
about 2 C higher than the inside air temperature. 

It is true that there is not much ventilation. But I
still suspected about the initialization, and I want
to know how to eliminate the initialization effect for
design days. 



--- Rick Strand <rkstrand@xxxxxxxx> wrote:
> Hannah:
> 
> It is difficult to give you any advice about the
> validity of the surface 
> temperatures you are seeing because the text of your
> message is relatively 
> vague.  How much higher are the temperatures than
> you are 
> expecting?  EnergyPlus does have an initialization
> process that it goes 
> through, but it should iterate enough days during
> the warmup process to 
> eliminate the initial conditions.  If you like, you
> can send me your input 
> file and I will see if the temperatures seem
> unreasonable.  That would 
> allow me to look at your other concern as well.
> 
> Rick Strand
> 
> At 09:25 AM 7/17/2003 -0700, you wrote:
> >Hi,
> >
> >I am simulating a natural ventilation environment
> for
> >several cooling design days without wind. There are
> >some thermal mass on the floor but not too much for
> >walls. I think the air temperature looks good, but
> >surface temperature and MRT seem a little bit high
> >than I expected. I suspect this is because E+ has
> some
> >special initialization that may influence. What do
> you
> >think?
> >
> >Beside, I found air change rate in .csv output
> column
> >BM seems too high and not corresponds to the
> >infiltration volume in column BL. Is this a bug or
> >something else?
> >
> >Thanks,
> >
> >
> >
> >
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