Thanks, Joe
I shall look up some of those references.
Mr. Ooi's test lab is in UNIMAS, Kuching, which is near the equator. I believe, the estimation formula is not so accurate, as shown in the graphs for Singapore.
Dr. Li
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: YJHuang@xxxxxxxxxxxxxxxxxxxxxxxx
> Date: Mon, 1 Feb 2010 16:16:07 -0800
> Subject: Re: [EnergyPlus_Support] diffuse solar
>
> There are a number of empirical models for splitting the total global
> horizontal radiation into direct and diffuse components. A good place to
> start looking is the book, "Solar Radiation and Daylight Models for the
> Energy Efficient Design of Buildings (second edition)", by Tariq Muneer
> in the UK.
>
> In the US, there are models by Liu and Jordan (1960), Erbs et al.
> (1982), Reindel et al. (1990), and Perez et al. (1990), all described in
> various issues of Solar Energy. In Japan, there are models by Watanabe
> et al. (1983) and Udagawa and Kimura (1990). These are described in the
> Transactions of the AIJ (Arch. Inst. of
> Japan). Recently, a colleague of mine, ZHANG Qingyuan, and two other
> Chinese researchers developed another model and tested it for various
> Chinese locations
> with good results. I have a copy of the paper, but don't know the
> publication offhand.
>
> In my work, I'm most familiar with the Watanabe model, although I have
> written code and tested several of the others.
>
> Joe Huang
>
> Joe Huang
> White Box Technologies, Inc.
> 346 Rheem Blvd. Suite 108D
> Moraga CA 94556
> (o) +925 388 0265
> (c) +510 928 2683
> yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx
> www.whiteboxtechnologies.com
>
>
> YuanLu Li wrote:
> >
> > Hi, HuJia
> >
> > I have been following those mails.
> >
> > What Mr. Ooi wanted to do was to generate a special local weather file
> > which matches the days when he conducted temperature and other
> > measurements on his test building.
> >
> > He mdified the ODT of the IWEC weather file, with his measured ODT,
> > the matching of the simulated temperatures in the room and the
> > measured values are quite good, when the sun is not shining through
> > the windows.
> >
> > We will try using the formulae in the weather converter and see what
> > happens.
> >
> >
> >
> > Dr. Li
> >
> >
> > To: EnergyPlus_Support@ yahoogroups. com
> > From: hujia06@gmail. com
> > Date: Mon, 1 Feb 2010 15:17:21 -0500
> > Subject: Re: [EnergyPlus_ Support] diffuse solar
> >
> > Hi, Dr Li,
> > I am also curious about how to get Direct Normal and Diffuse from
> > Global and other variables. In EPlus, Direct Normal and Diffuse are
> > used as input to calculate some other variable, including Direct and
> > Diffuse illuminance from sun and sky, sky brightness and clearness.
> > There are some experts in this field, as you can find from the email
> > (subject:"weather file") I sent to this group on Jan 20.
> > Thanks,
> >
> >
> > On Mon, Feb 1, 2010 at 1:17 PM, YuanLu Li <yli006@hotmail. com
> > <mailto:yli006@xxxxxxxxxxx>> wrote:
> >
> > Hi, HuJia
> >
> > I noticed that you are very interested in finding the various
> > fields in the weather file.
> >
> > My former student Mr. Ooi KB, in a PhD program now, is very
> > interested in findint out how to use:
> >
> > *Global horizontal, HIR, Cloud cover, ODT and RH, *to get the
> > Direct Normal and Diffused Horizontal fields in the EPW.
> >
> > He can get those five sets of data from the Kuching Met. Station
> > for his work in East Malaysia. However, he does not know how to
> > divide the Global into the Direct Normal and Diffused horizontal,
> > which the EPlus use for simulation..
> >
> > Dr. Li
> >
> > P.S. for Linda. Do you have any sub-routine in Fortran or any
> > programming language, to generate these two missing fields in EPW.
> > (Direct normal and Diffused Horizontal from *Global horizontal,
> > HIR, Cloud cover, ODT and RH*)
> >
> > He passed on the sub-routine from ticket #2013 for me to solve his
> > ground surface temperature calculation. [EnergyPlus #2013]:
> > Basement outside surface temperatures. I am studying it and see
> > whether all the data are available, to run it as a C++ program.
> >
> > What he really nead is the correct solar radiation level through
> > the windows, so that the simulated and the measured room
> > temperature can match.
> >
> > He tried measring the DIrect Normal using a Pyranometer. Because
> > the spectrum of this device is wider, the measured value was about
> > 30% higher.
> >
> >
> >
> > Dr. Li
> >
> >
> > Windows® phone-your Windows stuff, on the go. See more.
> > <http://go.microsoft.com/?linkid=9708119>
> >
>
>
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