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Re: [EnergyPlus_Support] Weather Data Converter





Yes, it should be reasonable to expect that.

If you send me (privately or submit the files to the helpdesk - energyplus-support@xxxxxxxx), I will try to look at it and see if the weather converter calculation is messed up or not.

It also could depend on which version of the weather converter/dll you are using, many problems have been fixed over the years.

At 12:22 PM 3/31/2010, doylend wrote:
Hi, I've just started trying to use the converter program to generate .EPW files from source data which includes dry bulb and wet bulb temperatures - is it reasonable to expect the converter to calculate both dew point and relative humidity values?  The documentation suggests so, but my results suggest otherwise.

The source data is comma separated and looks a little like this:

1,1,1,0,0,-3.5,-4,103720,250,3.6011108,0

The relevant part of the .def file looks like this:

DataElements=month,day,hour,glohorrad,difhorrad,drybulb,wetbulb,atmos_pressure,winddir,windspd,opaqskycvr
DataUnits=x,x,x,'Wh/m2','Wh/m2','C','C','Pa','deg','m/s','x'
DataConversionFactors=1,1,1,1,1,1,1,1,1,1,1

In this example I have -3.5 degC DB and -4 degC WB in the input, the resulting line in the output EPW file has -3.5 degC DB, -4.9 degC DP (which seems fine) and 138% RH (which is clearly wrong, and should be more like 89%).

Anyone have an idea what my obvious mistake might be?

Cheers,

Nick





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