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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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