Re: [EnergyPlus_Support] Weather Converter

[Linda Lawrie <linda@xxxxxxxxxx>]

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
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Member: EnergyPlus Development Team



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