[TRNSYS-users] Weather generator T54

[argia galduta <recicleds@yahoo.es>]

Dear simulators,

 

I'm trying to use the weather generator T54 with version 15.3, and i'm getting confusing results.
For example, using the data in nrel.dat for Orcata, CAL (#11), and integrating daily, i get this:

  RADIATION
TIME            GLOBAL      DIRECT      DIFFUSE  
[HR]                                             

+4.05400E+03 +2.89376E+04 +2.89096E+04 +7.45607E+03 -> SUNNY DAY, SUMMER
+4.16800E+03 +6.36239E+03 +1.91064E+02 +6.22575E+03 -> CLOUDY DAY, SUMMER
+4.90000E+01 +8.42967E+03 +1.47342E+04 +2.42320E+03 -> SUNNY DAY, WINTER
+1.68000E+02 +1.77229E+03 +6.80880E+01 +1.74991E+03 -> CLOUDY DAY, WINTER

The sum of direct and diffuse is much superior to global radiation, only gets close when direct is small.
In winter, sunny days, direct radiation is much greater than global (almost double).

Should i ignore direct radiations and use global and diffuse? Am i missing something?

 

Thanks for your help

 

Gabriel Colomer
Industrial Engineer

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