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Re: [EnergyPlus_Support] generating weather file
There are ways to generate approximate hourly data from limited weather
information. A study of weather records several years ago (Cash et al)
shows that temperatures can be estimated with about 10% accuracy using a
simple cyclodial function based on average temperature and daily
extremes. You could modify this a bit so that low temperatures occur
just before dawn.
Solar can be calculated from equations for your sire. The problem is
that we can reasonably calculate a clear day solar gain, but estimating
the effects of cloud cover is still a crap shoot.
Rain is not much of a problem because E+ uses just a rain indicator, not
a measured amount.
you need something for wind. Moisture (outside RH) is another matter.
I don't know of any studies that try to preict outdie dew point
temperature cycles.
Any wha, you have a lot of data to gather and put in a spreadsheet that
the weather generator coupd process.
Have you got enough time to record your own sit data?
Ned Lyon
Senior Project Manager
Simpson Gumpertz & Heger Inc.
41 Seyon Street
Building #1, Suite 500
Waltham, MA 02453
Phone: 781-907-9000
Fax: 781-907-9009
>>> teklay1979@xxxxxxxxx 03/13/04 3:38 AM >>>
Mike
last time i have comunicated with Drury Crawley from
DOE but he/she can't find the place that i need. so i
need to generate my self. so could you help me to work
this.
* can Energy Plus accept monthly data?
* what can i do if the data are not available ?
Tek
--- "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
> What specific location(s) do you need data for?
>
> Mike
>
>
> On 11 Mar 2004, at 7:47, teklay Weldeabzgi wrote:
>
> >
> > I am trying to simulate new buildings. but here
> in my
> > country the national meteorological service
> doesn't
> > have enough weather data for the place i need. but
> > they have only monthly average, and i need to
> > interpolate and generate an .epw data to use in my
> > simulation.
> > So is there any one help me how can i do this.
> > please tell me the steps and procuders to follow
> or is
> > there any method to work on this
> >
> > Tek.
> >
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========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
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