Re: [TRNSYS-users] TYPE 73

["Diego A. Arias" <daarias@wisc.edu>]

Hi Guillaume,

Thanks for point out this problem. During the initialization call, the 
initial temperature TM is not defined, therefore it starts with 0°C, 
which then may fall in the conditional IF (TM < TA) TM = TA + 1.
Therefore, although unintended, the effective initial temperature TM is 
around ambient temperature.
If you think that this initial value is affecting your results, you may 
want to try running 13 months, and checking if your results for the last 
month is different from the first one.
Best regards,

Diego


Guillaume Faye wrote:
> Hi,
> I am working on a project aiming at simulating the effect on the urban 
> microclimate of thermal flat plate collector integrated in the 
> building' s frontages.
> I am developping a model based on the TYPE 73.
> This model uses Klein's equation to determine the top loss coefficient 
> UL. To determine this coefficient, we need to know the mean absorber 
> plate temperature TM, which is not a parameter and not an input. A new 
> value of TM is calculated once UL as been determined. But we need to 
> have an initial value of TM to determine a first value of UL. I didn't 
> find which initial value was used. So can you tell me which value is 
> used?
> Thanks
> Guillaume Faye
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--
Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706