7.6 HEAT CONDUCTION IN A THREE-LAYERED WALL
 
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·
 System description
·
 Introduction
·
 Model
·
 View
   
 
   
Fig. 7.5: View of the virtual-lab.
    
 
System description
 
The one-dimensional, steady-state heat flow through a three-layered wall is modeled. The schematic representation of the system and the model (i.e., the series thermal resistors) are shown in Fig. 7.30.
 
Fig. 7.30: Schematic representation and model of the system.
 
The mathematical model is composed of the following equations:
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Introduction
 
The virtual-lab introduction is shown in Fig. 7.31.
 
Fig. 7.31: Introduction panel.
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Model
 
The inner () and outer () temperatures are known variables (i.e., the boundary conditions). The model equations, sorted and solved, are the following:
 
As the model mimics the steady-state temperature profile for certain boundary conditions, it is static (i.e., time does not play a role in it). Therefore, the model equations are included in the Constraints panel.
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View
 
A part of the tree of elements is shown in Fig. 7.32. Open the virtual-lab and look at the properties of the tree elements.
 
Fig. 7.32: Tree of elements.
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