Theory For my Heat Project

This is a heat project, so please I need a theory for my project. I already wrote an Abstract, introduction, and a Nomenclature.
I have attached the following:
1- Figure 1 & Figure 2 I guess should be used in Theory so basically I solved the nodes and scanned them for you.
2- three different samples that are for different projects but the same procedure and so. The only difference is the shape. you can read search and so and understand to write it.But please this is really important do not copy this because if you do so I will be dismissed from university I already have a plagrisim warning. Be careful not to copy anything from any of the samples (becaue they are already uploaded in turnitin) and do not copy from outer sources. You only can read, understand, and write from scratch.
3- My project is attached. you will see a picture of the shape that I should solve and write about in this project.
4- Finally, I have attached the abstract, intro, and nomenclature that I already did for my project.

Please write it in a good and understandable way.

Thanks,