Jump to content

Single Axis tracking simulation


Ahmad Elghobashy
 Share

Recommended Posts

I need help on how to simulate a single axis tracking system with a rotation angle +/- 52°

what would be the right parameters to simulate such system

Rotation axis incline: ?

Rotation angle of Opening: ?

Surface Usage Factor: ?

Also if the land has a natural tilt angle towards South, how can this be taking into consideration in the simulation ?

Link to comment
Share on other sites

Hi Ahmad,

there are three different kinds of single axis tracking:

  1. Rotation around one axis in the North-South plane (Single North-South Axis in PV*SOL)
  2. Rotation around the East-West axis (Single East-West Axis in PV*SOL)
  3. Rotation around the vertical axis (Single Vertical Rotation Axis in PV*SOL)

First you will have to decide what kind of tracking system you want to simulate. There are small images in PV*SOL that will help you to understand the differences. And here are some more explanations:

https://help.valentin-software.com/pvsol/2018/pages/pv-modules/#tracking

The Surface Usage Factor (space utilization factor) is explained as follows:

Quote

The space utilisation factor indicates the distance between successive module rows. A space utilisation factor of 1 means that the distance from one row of modules to the next is equal to the width or height of the module. If the space utilisation factor is 0, the next row of modules is infinitely far away. A space utilisation factor of 0.5 means that the distance is two module lengths or widths.

If the land itself is inclined, you will have to adapt the surface usage factor according to the trigonometry. If you need help with that, let us know.

Kind regards,

Martin

 

Link to comment
Share on other sites

ok, so are your modules mounted vertically on the tracking system? If not, you would have to enter the tilt angle at "Rotation Axis Incline". Your Rotational Angle of Opening would be 104° (2 x 52°). The surface usage factor really depends on how close you want to install the trackers, how high they are, the tilt angle of your land and so on. If you just want to simulate one tracking system, set it 0.

Kind regards,

Martin

Link to comment
Share on other sites

yes, you are right about the surface usage factor, given that your land is levelled.

The rotation axis incline is the angle around which your rotation axis is rotated :) It is hard to explain in words I guess...

  • If you set this value to 90°, the rotation axis is vertical, so your modules will rotate like a revolving door, around a vertical axis.
  • If you set this value to 0°, then the rotation axis is horizontal, from South to North, and the modules will rotate like a lid from trash can perhaps. Or like a seesaw, where one kid is sitting in the West and the other in the East.
  • Any value in between would be comparable to the rotation of a revolving door when the whole floor is tilted.

Does that help?

Kind regards,

Martin

 

 

Link to comment
Share on other sites

Hi Ahmad,

see this diagram here:

usage factor tracking.png

Your surface usage factor is (width or height of PV) / (distance of trackers). If row distance is 4 meters and your trackers are 2 meters high, the surfacce usage factor is 0.5. It is important that the dimension or axis in which you measure your module (width or height) is the same as the distance of your trackers.

Kind regards,

Martin

Link to comment
Share on other sites

the backtracking function ensures that there is no shadow from adjacent trackers on the module. To accomplish that, the trackers must stop following the sun at some point, so that the modules don't have the optimal angle towards the sun anymore. So the solar irradiation on the modules will always be a bit smaller with backtracking enabled compared to shading-free tracker rows with larger distance.

If the row distance increases, the backtracking can start later and the losses due to suboptimally oriented modules decrease.

Kind regards,

Martin

Link to comment
Share on other sites

  • 3 months later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...