[TRNSYS-users] European & American Collector Test Data

Diego A. Arias daarias at wisc.edu
Thu Apr 12 14:53:46 PDT 2007


Dear Jose Luis,

The program CODEPRO may be useful to you 
(http://sel.me.wisc.edu/codepro/new_codepro.html).  It allows you to 
play with different collector designs and get the collector efficiency 
terms, based on the two temperature differences.
Best regards,

Diego

barbate d. wrote:
>
> Dear TRNSYS Users:
>
> I would like to compare the performance of some american solar 
> collectors with some european ones. So far I understand, the thermal 
> performance coefficients test for collectors used in Europe and the US 
> are based on diifferent temperature differences ((Ti - Ta) in the US 
> and (Tm - Ta) in Europe).
>
> I would like to convert one type of equation into the other and 
> compare the coefficents. So I Read the TRNSYS Manual, and they convert 
> the equation with the coefficients aM, aN and a2 into an equivalent 
> one with cR(taualpha)n and cRr as coefficients. Then they use some 
> correction factors to change between a function of (Ti - Ta) and a 
> function of (Tm - Ta). But they have still the efficiency equation in 
> terms of  cR(taualpha)n/ cavg(taualpha)n and cRr / cavgr.
>
> How can I obtain from these coefficients again the coeffcients  aM, aN 
> and a2. It is possible to do that? In other words, it is possible from 
> the coefficients aM, aN and a2 from test based on the temp. difference 
> Ti - Ta) obtain the three coefficients aM, aN and a2  for the 
> efficiency equation based on the temp. difference  Tm - Ta
>
> I dont know if I have explained my problem clearly. Thank you in 
> advance for any possible help or comment.
>
> Best Regards
>
> José Luis Corrales Ciganda
>
>  
>
>
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-- 
Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706



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