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RE: [EnergyPlus_Support] Precipitation data

The precipitation data in the weather files are not really all that
useful.  

 

We use precipitation data sets as long schedules.  Examples of these are
included with the V 1.4 release in
DataSets\PrecipitationSchedulesUSA.idf.  These were modeled from NOAA
monthly average rainfall totals with rates and timing adjusted to match
the integer codes you are seeing.  See the TMY2 weather documentation.
(The file was too big to include all of them but most US locations are
available on request). 

 

 

________________________________

From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Simon Rees
Sent: Thursday, March 22, 2007 10:03 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Precipitation data

 

I have been wanting to examine precipitation at a number of sites and
hope to use data in some of the epw files. I am puzzled by some of the
numbers in the data column corresponding to precipitation. The
documentation says the data has units mm over the hour in question.
However, when looking at the data series for both Phoenix and Seattle
the numbers are in the range 5 - 25 and there are no zeros i.e.
suggesting there is continual rain. If this were mm of precipitation the
would amount to a huge rainfall over the year. Can somebody clarify
please?
Thanks, Simon

 



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