Re: [EnergyPlus_Support] how to make a real time weather file in EPW formate

["Michael J. Witte" <mjwitte@xxxxxxxx>]

The process of changing to csv, editing some values, and changing back should 
work fine.  The problem may be with the editing and saving of the csv file.  
Save a copy of the original csv file converted directly from a working epw.  
Then edit just one temperature and save the csv.  Now compare the two files in 
a text editor.  Is everything identical except the changed value?  If not, you 
may need to change some system settings or Excel settings.

I see signficant problems with using a typical year weater file and changing 
only the outdoory dry bulb temperatures.  Depending on the type of climate this 
may result in strange solar radiation patterns relative to the temperatures.  
And you should at least make sure that the dew point and relative humidity 
values entered are reasonable for the outdoor dry bulb temperature.  In 
general, you need at least dry bulb, humidity, wind speed, and solar data to 
form a good basis for simulation.

Mike


On 18 Dec 2007 at 12:19, Rongxin Yin wrote:

> hi everyone,
> 
> i met a quention in transfering real time weather CSV file into EPW file. when i
> use the weather convert.exe, but it terminate with no result. If i only change
> the outside temperature of the EPW.file, is it right? because i didn't get other
> weather data except outside tempearture. So i use the weather converter to
> change the original epw into csv.file, then change the Dry-Bulb Temperature in
> the csv file, finaly i use the weather converter again to change the csv into
> epw, but it terminate. i am not sure if it is right to change the Dry-Bulb
> Temperature only. So i test it again using following method.
> 
> If i change the temperature of EPW.file one by one with NotePad, and the EP runs
> normal. but it takes so long time to change the temperature one by one.
> 
> how can i use the real weather file? or solve this problem?
> 
> thanks in advance,
> 
> Rongxin
> 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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