[EnergyPlus_Support] Re: AMY-weather files for North Europe

["rokkas80" <lukas.rokka@xxxxxxxxx>]

So if you download real-time weather data from the E+ in IWEC format the weather converter tool should be able to model solar data from these files? I tried for few north European sites but I didn't get any solar data, even if the real-time weather data do appear to have cloud cover information for the sites I tested.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...> wrote:
>
> If global radiation is provided, the weather 
> converter uses the Perez split model for direct 
> and diffuse calculations.  If no global is 
> provided then it uses the Zhang-Huang model to 
> come up with Global and then Perez model to split.
> 
> I believe all this is described in the Auxiliary Programs document.
> 
> For design days, there are several solar models 
> available -- ASHRAE Clear Sky, ASHRAE Taub (2009 
> clear sky) and Zhang-Huang.  Along with you being 
> able to put in your actual beam and diffuse 
> values, if desired.  The methods are described in 
> the Input Output Reference and the Engineering Reference.
> 
> At 08:04 AM 11/8/2012, rokkas80 wrote:
> >Ok. Based on cloud information from the weather files, or?
> >
> >--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Dru Crawley <dbcrawley@> wrote:
> > >
> > > The EnergyPlus WeatherConverter now does calculate direct/diffuse solar
> > > radiation if it's missing.
> > >
> > >
> > > On Thu, Nov 8, 2012 at 9:47 AM, rokkas80 <lukas.rokka@> wrote:
> > >
> > > > **
> > > >
> > > >
> > > > E+ don't model the solar radiation by it self. You need to have weather
> > > > files with measured or/and modeled values. But E+ may have some simple
> > > > "sanity check" (like that there shouldn't be any solar radiation during
> > > > night time and min/max limits).
> > > >
> > > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@>
> > > > wrote:
> > > > >
> > > > > no. i mean from latidute and longitude and the equation of time, etc.
> > > > together with some assumptions about 
> > atmospheric conditions, the direct and
> > > > diffuse radiation can be calculated. It does not have to be measured, or?
> > > > If there was no weather data for this, or incorrect weather data...I was
> > > > under the impression that e+ runs a "sanity 
> > check" to see if the radiation
> > > > from weather files is okay. And if not, it uses it's calculated results?
> > > > I've made a excel spreadsheet once to do 
> > this as a check...and the results
> > > > are okay.
> > > > >
> > > > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "rokkas80" <lukas.rokka@>
> > > > wrote:
> > > > > >
> > > > > > I don't understand what you are asking for, could you please clarify?
> > > > > > Do you mean that e+ calculates the 
> > direct normal solar from global and
> > > > diffuse solar? Well, the Weather Converter 
> > program can calculate the direct
> > > > normal from global and diffuse solar according to the documentation.
> > > > > >
> > > > > >
> > > > > > --- In 
> > EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@>
> > > > wrote:
> > > > > > >
> > > > > > > "Even though the solar data from STR�NG varies in quality it's
> > > > still better, for most sites, than that 
> > provided in the ASHREAE IWEC files"
> > > > > > >
> > > > > > > Doesn't e+ calculate the direct solar?
> > > > > > >
> > > > > > > --- In 
> > EnergyPlus_Support@xxxxxxxxxxxxxxx, "rokkas80" <lukas.rokka@>
> > > > wrote:
> > > > > > > >
> > > > > > > > Hi all,
> > > > > > > >
> > > > > > > > I've updated my tool for creating 
> > Actual Meteorological Year (AMY)
> > > > files for North Europe. The tool can be downloaded at
> > > > http://rtwc.blob.core.windows.net/clickonce/publish.htm.
> > > > > > > >
> > > > > > > > News for this version, Real-Time Weather Converter 2.0:
> > > > > > > > - All data from ISD is available, also data marked as
> > > > "Additional". If you tried the tool before 
> > but didn't get any data for your
> > > > station, you should now be able to get usable data for most locations.
> > > > > > > > - A new server that maps data from the SMHI server. Now retrieval
> > > > time are just a few seconds for one year of 
> > solar data. A AMY-files can now
> > > > be made in under a minute.
> > > > > > > > - Missing data points are visualized graphically.
> > > > > > > >
> > > > > > > > The tool was made as part of my MSc degree project at
> > > > M�lardalens University, Sweden. It uses 
> > observed actual weather data from
> > > > the Integrated Surface Database (ISD),
> > > > http://www.ncdc.noaa.gov/oa/climate/isd, and modeled solar radiation data
> > > > from STR�NG, http://strang.smhi.se.
> > > > > > > >
> > > > > > > > Roughly, the tool covers most of Europe excluding south Europe.
> > > > Long-term coverage is from 1 of January 1999 to up to date for the
> > > > northernmost area, the southern area is covered from 1 of June 2006 (see
> > > > website for map).
> > > > > > > >
> > > > > > > > The quality of the solar radiation data from STR�NG varies in
> > > > the geographical dimension. Roughly the 
> > model gives good result for Sweden
> > > > and Central Europe, but underestimates for 
> > ocean coast near areas like UK,
> > > > Norway etc. The model do underestimate as well for the Baltics, northern
> > > > Finland and some high altitude sites. There's a validation figure (for
> > > > Google Earth) at the tools homepage in the help section. Even though the
> > > > solar data from STR�NG varies in quality it's still better, for most
> > > > sites, than that provided in the ASHREAE IWEC files (which underestimate
> > > > direct solar radiation in the range of 20 to 40 % for the area in
> > > > question). For model calibration these data are very useful.
> > > > > > > >
> > > > > > > > You are free to use the modeled solar radiation data from
> > > > STR�NG. Weather data from ISD may however have restrictions regarding
> > > > commercial usage, depending on country and what data is being used. Some
> > > > countries (UK, Norway, Netherlands, 
> > Slovenia and Sweden from next year(?))
> > > > have free weather data, other countries some restrictions and some
> > > > countries have most of their weather data 
> > restricted. There is a method in
> > > > the tool that excludes data marked as 
> > "Additional" by WMO, this should make
> > > > commercial use of resulting weather files possible for most countries (my
> > > > personal interpretation of WMO resolution 40 Annex I). But it's up to the
> > > > end user of the tool to read and interpret 
> > the WMO resolution 40 and check
> > > > with their National Weather Service for their data policy. If intentions
> > > > are non-commercial the data accessed and created by this tool can be used
> > > > freely for all countries in question.
> > > > > > > >
> > > > > > > > The ISD lack recent data for many of the German weather stations.
> > > > Observed weather data can still be acquired from other sources (i.e.
> > > > EnergyPlus real-time weather service, 
> > Wunderground) and by using copy/paste
> > > > inserted into the tool. The tool has 
> > methods for re-sampling, interpolating
> > > > and filling data gaps.
> > > > > > > >
> > > > > > > > This tool was developed to make AMY-files to be used for model
> > > > calibration. But it would be possible to use a similar approach to create
> > > > Typical Metrological Year (TMY) files as 
> > well, at least for the geographic
> > > > area where there soon exist 13 years of 
> > free solar radiation data available
> > > > free via STR�NG. Let me know if you think 
> > there's a demand for this kind
> > > > of weather files or if you know of any available tools or algorithms that
> > > > can make this kind of files.
> > > > > > > >
> > > > > > > > Best regards,
> > > > > > > > Lukas Lundstr�m
> > > > > > > > https://sites.google.com/site/weatherconverter
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
> >------------------------------------
> >
> >Primary EnergyPlus support is found at:
> >http://energyplus.helpserve.com or send a 
> >message to energyplus-support@...
> >
> >The primary EnergyPlus web site is found at:
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> >
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> >
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> >
> >
> >
>




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