[TRNSYS-users] help

[Sine Girm]

Dear Trnsys users

I was simulating a parabolic trough power plant. the model I used was
the SEGSVI power plant that has been built in the modjave desert of
California. the input for the solar radiation is the direct normal
insolation. when I simulate the DNI, beam radiation, total
radiation(global radiation), the simulation result shows the total
radiation is being maximum for summer seasons and minimum for winter
seasons. but normally what I know is, the total radiation is the sum
of beam radiation and diffused radiation and also the simulation
result shows that the DNI is a little bit higher than that of the beam
radiationof a surface (WHY). in doing all these, the weather data I
used was from Dagett, and the component for the weather data processor
was  (TRNSYS component) was Type-15-2. from the result I told you if
you tell me the reason for this. and what if I used the input for the
trough to be beam radiation instead of DNI.
I will attach you the figures for those I described,for  summer season
and winter season
-------------- next part --------------
A non-text attachment was scrubbed...
Name: summer season.jpg
Type: image/jpeg
Size: 128940 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20090128/f51edc2a/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: winter season.jpg
Type: image/jpeg
Size: 125836 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20090128/f51edc2a/attachment-0003.jpg>