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Showing results for tags 'bifacial'.
How are thermal losses accounted for in bifacial modeling. With surfaces that have a high albedo, do thermal losses from the heat due to the reflected light become a factor? If not what is a appropriate way to use PVsyst to model that type of effect. I attached a screen shot from the PVsyst documentation for reference. Thanks in advance!
Hi, I've been comparing the rear irradiance model published by Marion et al. ("A Practical Irradiance Model for Bifacial PV Modules", 2017) to the PVsyst 2D bifacial model. There are some differences, such the fact that PVsyst doesn't include irradiance reflected from the front of a row to the rear of another row, and the fact that the Marion model considers 1-degree slices of surface (ground, sky, or module row) instead of discrete ground points when calculating view factor and IAM factors. One difference I'm trying to understand is the diffuse IAM correction factor as a function of ground point. Marion prescribes an IAM correction factor curve as a function of one degree surface slice, shown below. When using the values from this curve I obtain a view factor profile that is similar to, but noticeably different from, the profile shown in PVsyst. Below is a PVsyst view factor profile for a system with zero degree tilt, 0.5 GCR, and 1 m height (blue curve), overlaid with one calculated using the Marion correction factors from the curve above (red dashed line). The curves are similar but noticeably different. I was wondering how PVsyst is calculating the IAM correction factors that are used, as they appear to be different from what was derived from Marion et al.
In PVsyst, is it possible to model the east west bifacial PV systems? When I try to model the 3D scene and come to the bifacial tab, I see only possibility of unlimited sheds and trackerrs, but cannot use bifacial option for several orientations. So if I had to see the energy yield and performance of the system, I had to model the east and west side of the system separately and then correlate the results? Would be happy to know your feedback on this.
I cannot simulate tracker's 3D scenes built with AutoCAD and plugings like PVCase or VirtuoSolar. With fix structure I was able to solve it by changing the tolerance in the "shading scene construction > tools > orientation management". Most of the scenes I am building are placed in sites where irregular terrain characteristics having NS tilted trackers with tilt angles from -8Dgr to 8Dgr is very common. In my projects computing 3Dscenes under this scenarios is a must specially because I need to use bifacial modules. PVSyst 7.2.12 Screen shoots How can I process this type of 3D scenes ? What I am doing wrong ? Thanks and regards M