[TRNSYS-users] Angle of Incidence with Type16g

[José María Roca]

Hi Jeff, thanks for your reply.

I think I have everything correctly setup, and the GHI from the file is the same as the GHI output from the type 16. For testing purposes I’m using a horizontal surface without tracking.

I have tested the following, adding 0.000001 W/m2 to the GHI in the file just after the last value different from zero (aprox. time of day 20:00) and the angle of incidence works perfectly! 

I only did this on the first day to compare, the second day of simulation still has the problem (i’m attaching a screenshot), it seems that the type16 needs some data on that particular time…

My thesis director told me that the University has purchased the version 18 of TRNSYS, so today i’m updating from my version 17.00, hopefully it may resolve some of this…

I’ll try with the new version and let you know if I had any luck.

Best,
José María Roca



> 
> From: Jeff Thornton <thornton at tess-inc.com>
> Subject: Re: [TRNSYS-users] Angle of Incidence with Type16g
> Date: 8 de agosto de 2018, 9:23:46 p.m. UYT
> To: "TRNSYS users mailing list at OneBuilding.org" <trnsys-users at lists.onebuilding.org>
> Reply-To: thornton at tess-inc.com
> 
> 
> Jose,
> 
> Carefully check that the data reader and radiation processor are both configured correctly.  Pay special attention to the following items:
> 
> Type 9: Have you selected the correct mode such that time of TRNSYS corresponds to the time of the measured data?  Have you set the correct tracking mode?  Make sure that Type 9 does not interpolate the data.
> 
> Type 16: Make sure you have the correct starting day set and that you have the "Time of Last" and "Time of Next" connections made.  Also check the "shift in Hour Angle" parameter.
> 
>  
> Use the online plotter to make sure that the radiation from Type 9 alone makes sense and then compare to the radiation from Type 16.
> 
>  
> Jeff
> 
>  
> ---
> Jeff Thornton
> President - TESS LLC
> 22 N. Carroll Street, Madison WI USA 53703
> Office: (608) 274-2577  Fax: (608) 278-1475
> www.tess-inc.com
> E-Mail: thornton at tess-inc.com
> On 08/08/2018 11:15 am, José María Roca via TRNSYS-users wrote:
> 
>> Hi everyone, first time here and it seems like a nice place!
>>  
>> I will cut to the chase (that’s why I’m here) [should I make some kind of introduction of myself?], I’m having some issues with the angle of incidence calculated by the type16g.
>>  
>> I’m using a CSV file with some kind of TMY data for Uruguay developed here, where I have among other data, the hourly global incident radiation on horizontal and the hourly DNI. I’m using type9e to read the file and to pass it to the radiation processor. 
>>  
>> Testing with a flat surface, the issue is that the angle of incidence drops to zero just as the radiation does, instead of increasing to 90º as it should…(i’m attaching at the end a graph capture).
>>  
>> If I disconnect the GHI from the reader on to the processor, and instead type as input for the processor a GHI of 1000 W/m2 the angle of incidence is OK (the radiation as expected isn’t). The DNI doesn’t seem to have an effect on the angle of incidence, only the GHI.
>>  
>> Has anyone encountered this issue before? 
>>  
>> How can I deal with it?
>>  
>> Thanks for any response.
>>  
>> Best,
>> José María Roca
>>  
>>  
>> <GHI 1000.jpeg><Output Type16g-GHI data reader.jpeg>
>> 
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>> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org <http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org>
> 
> 
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