[TRNSYS-users] Questions to Type 12

[David Bradley]

Michael,

>1.)     Why does the model ignore the initial room temperature set 
>as parameter 4?

there appears to be a bug in the code. I have fixed it and can send 
you the new Fortran directly if you are comfortable recompiling code 
yourself. If not, the fix will be in the next release. Please let me 
know which you would prefer.

>2.)     For the purpose of the deck I am currently creating, I need 
>to read in the parameter 2 (overall conductance U*A) by an external 
>file even though they remain to be constant. I set the parameter 2 
>to string and defined a new variable by equation to read in the 
>value from the external file. But in this case the results are not 
>the same as in the case of setting the value of U*A directly in type 
>12c. I also compared the result of the equation with the value 
>supposed to be the right one. Could that be a problem of first time 
>step manipulations?

I am not sure how you are reading the external file (Type9 perhaps) 
but if so, then by the time the outputs of Type9 are set, the 
parameter values for Type12 and all of the other components have 
already been read in from the deck. You might instead use Type70 
(Utility: Parameter Replacement) which is designed to read an 
external file containing replacement parameter information and 
replace it before Types have processed it. The one potentially 
confusing thing about Type70 is that it identifies the components 
whose parameters you want to replace by that component's UNIT number. 
You can find a component's UNIT number by looking at the "Control 
Cards" tool (where you set the simulation start and stop time) and 
checking the "Component Order" tab.

Cheers,
  David

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