[TRNSYS-users] Temperature-control of surfaces

[via TRNSYS-users <trnsys-users@lists.onebuilding.org>]

Hello everyone,

I would like to set the inner temperature of a wall at a constant value. 
However it doens't work. Here are my steps in order to do that:
1. I create a room with SketchUP, defining the walls as "EXT WALL"
2. In TRNBUILD, I choose the "to be temperature-controled wall", and 
define the "surf-gain inside". In this cell, I create a new input: 
INPUT001. So the inner gain surface is : I=1*INPUT001
3. I put the inner surface temperature of the wall as an output
4. In TRNSYS, I create a type-23 module (PID control) and link it to the 
TYPE 56.
      from TYPE23 to TYPE56: Control signal = INPUT001
      from TYPE56 to TYPE23: TSI of the controlled wall = Controlled 
variable
5. The Setpoint of the TYP23 is set at 20.

However, you already understood that if I sent this message it's because 
it doesn't work. I thought that the TYPE23 would adjust the inner gain 
in the surface in order to get 20°C on it. But the results say that 
nothing seems to control the temperature of the inner wall (the 
temperature still reacts like the air temperature).

What I already tried:
- Change the Wall type and set it on "BND WALL" or "ADJ WALL" it doesn't 
work

A few years ago, I was able to temperature-control any wall but I 
definitely don't remember how. Any clue?

Thanks in advance

Wirich