Jump to content

Bi-facial Modules - View Factor for Rear Side

Rafael Santos

Recommended Posts


I recentrly ran a simulation using a bi-facial module, and I was trying to understand better the physics and results of it.

I came across a loss value of -78,82% for the parameter "View Factor for Rear Side" as shown in the loss diagram attached.

My question is how It came to this number, since my absolute results were:

- Global incident on ground: 1581 kWh/m²;

- Ground reflexion loss: 1265 kWh/m² (this value is ok, 80% loss due to an albedo of 0.2);

- View Factor for the rear side: 749 kWh/m² (this is strange, because I understand it is supposed to be (1581-1265)*0.7882)

Is it something I am doing wrong?

Best regards,



Loss Results


Loss Diagram

Link to comment
Share on other sites

  • 2 weeks later...


I did some reverse engineering, and found that with the loss value of 115.95 kWh/m² (36.36%) everything work fine, including all the other losses!

Maybe there is something wrong with the values on the "View Factor for Rear Side" losses presented on the table?



Link to comment
Share on other sites

  • 4 weeks later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...