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
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d.bradley@tess-inc.com
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