[TRNSYS-users] some problems found with the type92 in Trnsys16

[Yujun TAO]

Hello,
I found some problems with the type92 in Trnsys16. I checked the program *.for
One problem is located here :
 
    PERFORM INITIAL TIMESTEP MANIPULATIONS
...
!check the parameters for problems and RETURN if any are found
...
IF((HTREFF.LT.0.).OR.(HTREFF.LT.1.)) CALL TYPECK(-4,INFO,0,4,0)
 
Well, the second comparison in the parentheses of IF is wrong, it should be H(TREFF.GT.1). 
 
The other problems are located below the ligne of nomber 20. For the calcul of QAUX and QLOSS. Firstly, let's look at them:
QAUX = (FLOW*CP*(TIN-TOUT)+UA*(TBAR-TAMB))/HTREFF, 
QLOSS = UA*(TBAR-TAMB) + (1.d0-HTREFF)*QAUX
 
Generaly, the environmental temperature is higher than the average temperature of a chilled fluide, so TBAR-TAMB is less than 0, so for a electrical compressed chiller, it should take more chaleur. There is an impression that the ambiante give the chaleur to the fluide. Finally, the two fomulas shoud be like this: 
QAUX = (FLOW*CP*(TIN-TOUT)+UA*(TAMB-TBAR))/HTREFF
QLOSS = (1.d0-HTREFF)*QAUX
 
That's all. 
 
Aleck (France)


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