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Re: [TRNSYS-users] solar time X local time
Pablo,
I am using hourly weather data generated by the Meteonorm program. As
far as I know, this data is given at intervals of SOLAR TIME.
(Can anybody in this list confirm this information ?)
If I use this Meteonorm data file, obviously the Type 56 outputs will
also be at intervals of Solar Time. But the schedules in Prebid are
defined using the LOCAL TIME. I also need the simulation results in
LOCAL TIME.
I believe that Meteonorm uses the time reference specified by the file
format you select when exporting data (importing data into Meteonorm is
another problem). E.g. if you export to TMY2 files (which is the
recommended way in TRNSYS 16), the file will be created in local
standard time. I am not sure about older versions of Meteonorm and
different file formats, but this is the case for Meteonorm V5.0 and TMY2
export format.
As always, it is easy to check which time reference is used in a data
file by plotting the global solar radiation from the file versus the
extraterrestrial horizontal radiation from Type 16 or Type 109. Just by
looking at both curves, you can easily spot any time shift. You can
configure Type 16 so it assumes the data is in solar time or not and
compare both results.
I hope this helps,
Michaël Kummert
--
_________________________________________________________
Michaël Kummert
Solar Energy Laboratory - University of Wisconsin-Madison
1303 Engr Res Bldg, 1500 Engineering Drive
Madison, WI 53706
Tel: +1 (608) 263-1589
Fax: +1 (608) 262-8464
E-mail: kummert@engr.wisc.edu
SEL Web Site: http://sel.me.wisc.edu
TRNSYS Web Site: http://sel.me.wisc.edu/trnsys