Christoph,
The shift is defined as
SHIFT=LST-Lloc
Where
LST is the longitude of the standard meridian
Lloc is the longitude of the location
All longitude values are positive towards West (0=Greenwich)
In your case, LST = -15 and Lloc = -8.7
So SHIFt = -15-(-8.7) = -6.3
(A negative value in your case... But there is no restriction on the
sign of SHIFT, generally speaking)
Cheers,
Michaël
-----Original Message-----
From: owner-trnsys@relay.doit.wisc.edu
[mailto:owner-trnsys@relay.doit.wisc.edu] On Behalf Of Christoph Meyer
Sent: Friday, August 23, 2002 09:28
To: trnsys@relay.doit.wisc.edu
Subject: Solar Shift in Typr 16
Hi Users,
after a few years of not working with TRNSYS I picked it up again a few
months ago. From my earlier experience I remember that the value for
Solar
Shift has to be negative.
All the examples distributed with TRNSYS use negative values as well.
But
according to the documentation, it should be positive (or shouldn't
it?):
Shift=Lst - Lloc
Example Frankfurt: Lloc=8.7°; Lst(MEZ)°; Shift=6.3°
In the latest TRNSYS release, a negativ Solar Shift gives a much higher
irradiation and cooling load for rooms facing east than for those facing
west. Also, it leads to a lot of angle errors. Replacing it by a
positive
value, removes all those problems. Cooling loads are as expected on the
various orientations, and there aren't any angle errors.
I compared my results, created with postive Shift, with older versions.
They do seem to require negative values to produce the same results.
Very
confusing, the whole thing.
What's right for which TRNSYS-Release: Positive or negative?
Thanks,
Christoph Meyer
_________________________________________
Ing.-Büro für Bauklimatik Hausladen + Meyer GbR
Dr.-Ing. Christoph Meyer
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