[TRNSYS-users] Potential Bugs with Type94a

Amir Nashed nashed.amir at gmail.com
Fri Apr 25 23:07:55 PDT 2014


Hello Jeremy

Thank you for your reply.
That would be great. Just let me know at what time exactly we can meet.

I was actually trying to do that but it seems much more difficult than i
expected as what i know about compiling FORTRAN scripts is the same as what
i know about quantum physics i.e. almots nothing.
If you have time can you send me simple steps explaining how to compile the
FORTRAN script after modifying it? And are you aware of a free FORTRAN
compiler for windows 7?

I have actually tried to avoid type 194 as it is very complicated and it
needs some parameters that are not easy to get. But i will have a look.

Thank you
Regards,
Amir


On Sat, Apr 26, 2014 at 10:03 AM, Jeremy Osborne <
jeremy.osborne at solem-consulting.com> wrote:

> Hi Amir,
>
>
>
> To follow up on David’s email. I will be out on your campus next week
> (likely Friday) for a training session. Potentially go through it is in
> person.
>
>
>
> Interim solutions: Do you have a FORTRAN compiler? The developers are
> investigating  a fix however I have found that being able edit the FORTRAN
> behind the type to make them suit your needs is very useful. You could
> update the FORTRAN and recompile yourself. See the programmers guide user
> manual. We could run through this next week if you’re not familiar.
>
>
>
> Otherwise, have you looked at TYPE 194? Does this have the same errors?
>
>
>
> Cheers,
> Jeremy
>
>
>
>
>
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> *From:* David BRADLEY [mailto:d.bradley at tess-inc.com]
> *Sent:* Saturday, 26 April 2014 12:19 AM
> *To:* TRNSYS users mailing list at the Solar Energy Lab, UW-Madison;
> nashed.amir at gmail.com
> *Subject:* Re: [TRNSYS-users] Potential Bugs with Type94a
>
>
>
> Amir,
>   Thank you for the detailed email. We are looking into Type94 and will
> let you know what we discover.
> Best,
>   David
>
>
> On 4/25/2014 00:12, Amir Nashed wrote:
>
> Hello
>
>
>
> I previously sent 2 emails regarding potential bugs in Type94a (PV 4
> parameters model) and i can conclude the following:
>
>
>
> 1-      The equation used to calculate the IAM has a wrong sign in the
> third term (should be -6.26E-6 rather than +6.26E-6) (this error actually
> in some cases made the IAM to be larger than 1 which is incorrect as far as
> I know)
>
> 2-      The last term in the equation used to calculate the IAM in the
> manual is 1.4272E-8 while in the code is 1.472E-8
>
> 3-      Different equations than those indicated in the manual are used
> to calculate the effective angle of sky diffuse and ground diffuse radiation
>
> 4-      The variable SUNGND (surface ground diffuse radiation) is not
> calculated anywhere in the code and it is not one of the inputs
>
> 5-      The reference efficiency EFFREF does not account for the module
> surface area so I believe it should equal:  Vm*Im/SUNR*Area instead of
>  Vm*Im/SUNR
>
> 6-      Equation 5.2.5-21 used to calculate the cell temperature in the
> manual (page 74) I believe is incorrect [It should be
> UL*(Tc-Ta)=TAU_Alpha*Gt*(1-Eff/TAU_Alpha) thus Tc=Ta+
> TAU_Alpha*Gt*(1-Eff/TAU_Alpha)/UL ] (The equation is however applied
> correctly in Type94 code script)
>
> 7- Finally, I found out why Type94a overestimates the IAM losses (when the
> option is activated). This is because the SUN variable, (Effective global
> tilted irradiance) is calculated after multiplying each irradiance
> component IAM multiplier (i.e. TADIR, TAGND, TADIFF) by TAMAX (TAU-ALPHA at
> normal incidence), which i believe is incorrect as the IL at reference
> conditions already includes the effect of TAU-ALPHA at normal incidence.
> This error is however corrected when the IAM mode is disabled where the SUN
> variable is not multiplied by TAMAX
>
>
>
>  could someone confirm the aforementioned bugs?
>
>
>
> Thank you
>
> Regards,
>
> Amir
>
>
>
>
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>
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>
> David BRADLEY
>
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>
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