====== Wall Temperatures ======
FIXME  
While the general concept is correct, wall temperatures are no longer stored in the normal 3D files in post V4. \\
Needs rework

===== Storage of Wall Temperatures =====

As each grid cell can include up to 6 walls, the storage of the wall temperatures has to be different from the other variables, where only one value per grid is stored. \\
To store all walls in the Main File Atmosphere, 3 different temperature variables are used:

  * **X- Wall** is the wall parallel to the x-axis and to the front
  * **Y- Wall** is the wall parallel to y-axis and to the left 
  * **Z-Wall** is the wall parallel to the z-axis and on the bottom 

**The wall temperature values are always stored in the grid cell, to which the wall forms the left, front or bottom boundary.**

{{ ::walls.jpg?nolink |}}

The following sketch illustrates the allocation of X- and Y-walls in case of a simple building:

{{ ::walls_example.jpg?nolink |}}

This building covers 4 grid cells: (2,1) - (3,1) - (2,2) - (3,2). \\
The left corner of the building in (**2,1**) contains both the left **X-Wall** as well as the front **Y-Wall** of the corner. In contrast, cell (3,2) contains no walls although it is a part of the building. Following the rule given above, the walls to the right and to the rear in this grid cell are assigned to the cell (4,2) (right wall) and (3,3) (rear wall).
For the **Z-Wall**, the same principle applies. 

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