> I'm not sure I understand what you mean about relative parameters. The sign > of the parameters is typically built into the model so you provide positive > values and the model knows that the form of the equation is > > n0 - a1*(Ti-Ta)/Gt - a2*(Ti-Ta)^2/Gt. > > The one thing you must be careful about is that standards for the efficiency > equation differ. Sometimes efficiency is based on T inlet minus T ambient. > In other countries it is T average minus T ambient. Check the "More" button > next to each parameter and you'll get additional information about > specifically what the parameter is intended to do and what assumptions are > being made. Dear David, Ok, this is clear... The "relative" was probably a traduction error from my italian to your english; probably I should replace "relative" with "corresponding" :) So now I know these two different standard, and if I look to the standard used in my datasheet, it is the "wrong" one, namely the one not used by trnsys. I should have a look to other datasheets to find these values in the right standard. The other question was about the best configuration for my 12 m^2 array... Are you saying that I should use a single type 1 and set the total collector area to 12 m^2? Now I'm using the solution provided in the attached image... Each type has a total collector area of 4 m^2, so the total is still 12... Which is the best solution? Thanks again, Matteo.
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collectors.jpg
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