[EnergyPlus_Support] Re: Surface outside tempearture vs solar radiation.

["Jose Benitez" <joseb@xxxxxxxxxxxx>]

I have done these types of simulations, generally I have problems with
surfaces with more than 6 vertices's. The problem lies with the
calculation of direct solar radiation incident on these surfaces.
Further description of the problem can be found on post 11936. For a
tropical climate I have found outdoor temps to reach 150F on a 6"
concrete roof, a simple way to check is to calculate the sol-air temp.
I am still waiting on a reply from Linda on this problem.

Jose R. Benitez PE
Energy Affairs Administration
Puerto Rico 

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "finadz82" <finadz82@...>
wrote:
>
> Mr Justin,
> 
> I'm using weather data in E+ but i've modified the data on dry bulb 
> temperature, dew point,rel. humidity, atmos. pressure, direct 
> radiation, wind speed and direction according to the field 
> mesaurement during experimental work.
> 
> > Hi,
> > 
> > What weather file are you using? If you use typical weather file, 
> it may 
> > not be representative with actual field measurement
> > 
> > Justin
> > 
> > finadz82 wrote:
> > >
> > > Hi..
> > >
> > > I tried to simulate a small office building in a hot humid 
> country
> > > Malaysia with intense solar radiation. The longitudinal/glass 
> area of
> > > the building is facing east. To validate the result from E+ i 
> compared
> > > the data with field measurement. When i simulate the building, i 
> found
> > > that E+ gave much smaller surface outside temperature (roof and
> > > window) reading compare to the field measurement result. Eg: Roof
> > > surface outside temperature at 12 pm measured was 58 C but 
> simulated
> > > was only 35 C. It seems like the solar radiation did not give 
> impact
> > > to the roof/window temperature in my simulation but the result 
> of wall
> > > outside surface temperature is resaonable with my field 
> measurement.
> > > Could anyone explain the heat transfer and temperature of the
> > > roof/window? Material of the roof is metal roofing and window is 
> 6mm
> > > single clear glass.
> > >
> > >  
> > 
> > -- 
> > Justin Wong
> >    PhD Candidate
> >    Faculty of the Built Environment
> >    University of New South Wales
> >    UNSW SYDNEY, NSW  2052  Australia
> >    Room 6007, West Wing, Red Centre
> > (T)+61 2 9385 6373 - (M)+61 424 036 249
> > justinw@
> >
>



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