[BLDG-SIM] EPW file average hourly statistics for wet bulb temperatures

Jeff Hirsch Jeff.Hirsch at DOE2.com
Fri Aug 25 14:45:39 PDT 2006


You can use the eQUEST weather processor (eQ_WthProc)
   http://doe2.com/index_Wth.html
to read a EPW file and convert to DOE-2 compatible file (that
you can discard if not useful) but then you will have csv files
(orig and final - with doe-2 conversions) with the variables you
want (including headers) on the "final" csv if you uncheck the
"clear Interim Results on Exit" checkbox on the setup tab.

Here is an example original csv partial




     DryBulbT
     DewPtT
     Sol-GlobHor
     WindSpd
     WindDir
     Sol-DirNorm

      Month
     Day
     Hour
     F
     F
     w/m²
     mph
     degrees
     w/m²

      1
     1
     1
     18.86
     2.66
     0
     2.23
     110
     0

      1
     1
     2
     17.6
     5
     0
     0
     0
     0

      1
     1
     3
     17.06
     3.2
     0
     0.67
     0
     0

      1
     1
     4
     16.34
     1.4
     0
     1.56
     0
     0

      1
     1
     5
     15.8
     -0.4
     0
     2.23
     360
     0



Here is the example correcponding final

            DryBulbT WetBulbT DewPtT RelHum HumRatio Sol-GlobHor Sol-DirNorm WindSpd WindDir
      Month Day Hour F F F % lbmw/lbma w/m2 w/m2 mph degrees
      1 1 1 18.86 15.21 2.66 44.47 0.000907 0 0 2 110
      1 1 2 17.6 14.68 5 53.33 0.001024 0 0 0 0
      1 1 3 17.06 13.99 3.2 49.9 0.000933 0 0 1 0
      1 1 4 16.34 13.17 1.4 47.08 0.00085 0 0 2 0
      1 1 5 15.8 12.51 -0.4 44 0.000773 0 0 2 360


---
Jeff Hirsch
James J. Hirsch & Associates
Building Performance Analysis Software & Consulting
12185 Presilla Road
Camarillo, CA 93012-9243 USA
phone: (805) 553-9000
fax: (805) 532-2401
email: Jeff.Hirsch at DOE2.com
web: http://DOE2.com


----- Original Message ----- 
From: "Michael J. Witte" <mjwitte at gard.com>
To: <BLDG-SIM at GARD.COM>
Cc: <BLDG-SIM at gard.com>
Sent: Friday, August 25, 2006 9:56 AM
Subject: [BLDG-SIM] [EnergyPlus_Support] Average hourly statistics for wet bulb temperatures


My mistake!  You are correct that the epw-->csv conversion will only give DB,
RH, and Dew Point.  The alternate route is to run an annual simulation with
EnergyPlus using the weather file of interest, select "Outdoor Wet Bulb" as an
hourly REPORT VARIABLE, and then use the csv output file to generate
statistics.  One could even generate the averages with EnergyPlus by applying
schedules to the report variable and reporting the scheduled value as monthly
averages.

Mike


On 25 Aug 2006 at 6:20, Gerald Pde wrote:

> Energyplus weather files do not have wet-bulb
> temperatures, do they? I had the impression they only
> have DB , RH and Dew Point. You might have to manually
> convert to wetbulb which might be quite an exercise.
> Is there a simpler way of computing the data below?
>
> Thanks
> Gerald
>
> --- "Michael J. Witte" <mjwitte at gard.com> wrote:
>
> > If you are looking for long-term averages, you can
> > download the EnergyPlus IWEC
> > file for Brisbane (www.energyplus.gov --> Weather
> > Data) and use the EnergyPlus
> > weather converter to convert it from epw format to a
> > csv file which includes
> > column headings and can be opened in a spreadsheet
> > program.  Then you can
> > compute the averages from there.
> >
> > Mike
> >
> >
> > On 24 Aug 2006 at 17:55, Ashfaque Ahmed Chowdhury
> > wrote:
> >
> > > Hello All,
> > >
> > > I require average hourly statistics (Jan-Dec) for
> > wet bulb temperatures (°C
> > > or °F) of Brisbane, Australia. I tried to find
> > using Bureau of Meteorology,
> > > Australia website.But can't find any suitable
> > data. Can anyone give me any
> > > link to find it out?
> > >
> > > Thanks in advanced.
> > >
> > >
> > >
> > > --Ashfaque
> > >
> > > CQU, Australia
> > >
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> ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support
> > EnergyPlus-Support at gard.com
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