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Re: [EnergyPlus_Support] Weather Converter
At 12:59 PM 5/12/2005, Clarice Bleil de Souza wrote:
>1) I couldn't find anything for missing dewpoint temperature values in the
>documentation. There is only a value for it in the Missing Weather File
>Data Section (assigned as 3) but I suppose I cannot use it because the csv
>section ends with the following statement " Each data item field obeys the
>same
Missing Weather file data -- as described in the section is the values used
until it finds an actual valid value on the weather file input file.
If you look at Auxiliary programs, Data Field descriptions, you will find
the descriptions of each field. (page 47 in the PDF, ff/ page #
37ff) Just prior to that is the "IDD" (input data dictionary) for the data
record field -- bolded field names are the ones that EnergyPlus actually uses.
Actually, I see that it doesn't have a missing data field value. And, I'm
really not sure that CSV input format will accept missing values in certain
fields, but I imagine a 999. would be a safe guess.
>
>2) Yes I do have rainfal data, so do I assign 9 for the Present Weather
>Observation field anyway?
>
>I will check my csv file using an example epw file converted using the
>weather converter - I suppose this will be fine, do you agree?
>
>One more question just to finish, I'm inputing data for every 30 min. but
>I know ESP-r and Ecotect need hourly data, would it be possible to use the
>weather Converter to transform this input file into an hourly weather
>file? Or I can only do this inside E+? Just to check because if it's the
>case I'll transform my file into an hourly file before using the weather
>converter.
Use your data. Your Data Periods record should show 2 records per
hour. As I believe I described earlier, EnergyPlus will be able to use
both of those and then interpolate to your time step. The weather file
doesn't need to be an hourly data file -- just most of them are.
>
>Thank you again for the help.
>
>Best regards,
>
>Clarice
>
>
>Linda Lawrie <linda@xxxxxxxxxx> escreveu:
>At 12:17 PM 5/12/2005, Clarice Bleil de Souza wrote:
>
> >I have downloaded the E+ V1.2.2 and I've taken a look at the auxiliary
> >programs - weather converter. I noticed that there is a custom format but
> >as it uses a Fortran "Namelist" input field and I'm not familiarized with
> >this I decided to use the .csv, which I can build in an Excell spreadsheet.
>
>Too bad -- it requires no knowledge of the namelist input, I think, and I
>think it is pretty well described.
>
> >
> >Anyway, I have some missing data and I need to assign them some values,
> >I've taken a look at the documentation but I couldn't find a missing value
> >to assign to:
> >
> >1) Dew Point temperatures - I have Relative Humidity values and Dry Bulb
> >Temperatures do I calculate the DewPoint temperature from the values I
> >have or do I assign this field as missing, (in this case using which
> >value?), and the weather converter will calculate it?
>
>Assign it missing value. (look at the IDD description for the EPW format
>or whatever format you are using as an input format -- that will be the
>missing value you need to place there).
>
> >
> >2) Present weather Observation - I don't have data for this field and I
> >know that 9 is assumed as missing but as I have rainfall data and a
> >missing field will imply "no rain" I'm not sure about what to assign to
> >this field.
>
>Do you have hourly rainfall data? Personally, to get your values going, I
>would put in all 9's in the field.
>
> >
> >3) Present Weather Codes - Also I don't have data to this field and I'm
> >not sure if it will not interfere with rainfall data so I don't know
> >exactly how to fill it. What would be the missing value for it?
>
>These are described in the TMY2 manual -- I thought I had put them in the
>weather converter auxiliary programs description but perhaps for the
>interim release. (which will be soon)
>
> >
> >Apart from, that I would like to check if I specified the 3 following
> >field correctly:
> >
> >DESIGN CONDITIONS,0 (I want to use what is recomended by the ASHRAE
> >Handbook, but in a later stage not now)
> >TYPICAL/EXTREME PERIODS,0
> >GROUND TEMPERATURES,0 (I may use the Ground Heat Transfer tool in a later
> >stage)
> >HOLIDAYS/DAYLIGHT SAVINGS,No,0,0,0
>
>Those inputs are fine. If you put in the correct WMO for your station
>(LOCATION header record/value record), the program will try to find it in
>the ASHRAE locations.
>
>Remember that the CSV format is very specific and needs extra headers to
>describe the next lines. If nothing else, start from an existing CSV file
>for a different location.
>
>
>Linda
>
>EnergyPlus WebSite: http://www.energyplus.gov
>Owner: EnergyPlus_Support list
>Member: EnergyPlus Development Team
>
>
>
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>
>
>
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>
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>
>
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>
>
>
>The primary EnergyPlus web site is found at:
>http://www.energyplus.gov
>
>The group web site is:
>http://groups.yahoo.com/group/EnergyPlus_Support/
>
>Attachments are not allowed -- please post any files to the appropriate
>folder in the Files area of the Support Web Site.
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>Yahoo! Groups Links
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Linda
EnergyPlus WebSite: http://www.energyplus.gov
Owner: EnergyPlus_Support list
Member: EnergyPlus Development Team
[Non-text portions of this message have been removed]
The primary EnergyPlus web site is found at:
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