[TRNSYS-users] Solar PV System Analysis

Sat May 28 03:44:49 PDT 2016

Dear David,

How to import (Type 551) in the TESS Electrical library. 
Do we want to purchase it separately. I am unable to find 
it here. Is it an add-on to Trnsys 17?

Thank You,

Chaminda

On Fri, 27 May 2016 13:41:49 -0500
  David BRADLEY <d.bradley at tess-inc.com> wrote:
> Chaminda,
> 
>  I did not have a chance to look deeply into why you are 
>getting different results if you split up your two PV 
>simulations into two projects. However, I did notice a 
>few things about your project in looking at it.
> 
>  First, I do not think it is adviseable to have two 
>instances of Type99 that are both reading from the same 
>file. This might be the cause of the different results 
>when you move one of the PVs to its own project. Either 
>make a copy of the weather file and give it a different 
>name or just use one instance of Type99 that feeds its 
>outputs to both of your PV simulations.
> 
>  Second, there are errors and inconsistencies in the 
>solar radiation that is passed to the PV. In all cases 
>the total radiation input is connected. However, in some 
>case the beam radiation is connected from another 
>component's output and in other cases it is not. The 
>diffuse radiation input is not connected. This means that 
>the PVs think that there is 0 diffuse radiation at all 
>times. It is very important to be consistent about the 
>radiation inputs to the PV and to make sure that all 
>three (total, diffuse, and beam are all being passed to 
>the PV from another Type.
> 
>  Third, while you can use Type30 as an approximation for 
>shading on a PV it assumes that the impact of shading a 
>PV is linear (i.e. if you shade half the PV you will get 
>half the power output that you would from an unshaded 
>PV). This linear shading impact is often not the case 
>with PVs. There is an alternative model (Type551) in the 
>TESS Electrical library that offers a somewhat improved 
>model for shading PVs.
> 
> kind regards,
> 
>  David
> 
> 
> 
> On 05/27/2016 04:41, Chaminda Ranaweera via TRNSYS-users 
>wrote:
>> Hello,
>>
>> I made analysis for two surfaces. South and West. When I 
>>run both West and South programs run in same Trnsys file, 
>>then I get wrong result (Different result). But when I 
>>run it in two different files, then I get another result. 
>>Can anyone explain me the reason for this? Please help 
>>me. Trnsys Hotline is no longer helping to me.  I think 
>>this problem is due to inherent problem of Trnsys. Before 
>>sselling the product, they were replying to university. 
>>Now they are silent.
>>
>> Can anyone help me. Actually I am doing my final 
>>modelling for thesis. Nobody will give money to me to go 
>>for training on Trnsys and nobody knows whether it is 
>>useful or not.
>>
>> (I hereby attach Program File and results)
>>
>> Thank You,
>>
>> Chaminda Ranaweera
>>
>>
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> 
> -- 
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI  53703 USA
> 
> P:+1.608.274.2577
>F:+1.608.278.1475
> d.bradley at tess-inc.com
> 
> http://www.tess-inc.com
> http://www.trnsys.com
> 