THERMAL INSULATION
dissipation, passive gains or seasonal 
heat release become more beneficial, as 
illustrated in Figure 2.
At a fundamental level, this adaptive 
behaviour is achieved by influencing 
the main modes of heat transfer within 
the envelope, primarily conduction and 
convection, and in some cases radia-
tion. Depending on the system, this 
may occur through switching between a 
high-resistance mode, where heat flow is 
minimized, and a low-resistance mode, 
where heat transfer is allowed more 
readily or through a more gradual varia-
tion in performance.
Another important aspect of dynamic 
insulation is control. Some systems 
rely largely on passive material behav-
iour, while others depend on active 
operation, such as moving components, 
airflow management or predefined 
switching logic. In both cases, the effec-
tiveness of the system depends  
not only on the mechanism itself, but 
also on when and how that  
mechanism responds.
REPRESENTATIVE DYNAMIC 
INSULATION MECHANISMS
Dynamic insulation has been explored 
through a wide range of mechanisms 
and can be classified in several ways, 
including by heat-transfer mode, energy 
input, control approach, climatic 
suitability or switching range. For the 
purposes of this article, however,  
three representative examples are 
sufficient to illustrate the broader idea: 
movable or reconfigurable systems, 
airflow-based systems and phase-change 
material systems.
•	 Movable or reconfigurable systems 
are among the most intuitive forms 
of dynamic insulation and have 
long appeared in buildings through 
adjustable elements such as  
shutters and other operable insu-
lating layers. Their thermal behav-
iour changes by physically reposi-
tioning part of the assembly so that  
it alternates between a more insu-
lating state and a more conductive 
one. As an example of these systems, 
Figure 3(a) shows a rotating mecha-
nism in which the elements align 
to restrict heat flow in the insulated 
mode, whereas rotation opens a 
more direct heat-transfer path in 
the conductive mode. Their main 
advantage is the clarity and strength 
of the switching concept; although 
practical performance depends on 
reliable operation, whether manual 
or automated, and on the durability 
of moving components.
•	 Airflow-based systems modify 
thermal performance by directing 
air through or along the wall 
assembly, allowing the envelope to 
act as both an insulating layer and 
a heat-exchange medium. In Figure 
3(b), two common approaches 
are illustrated: parietodynamic 
systems, where air moves through 
dedicated channels within the 
wall, and permeodynamic systems, 
where air passes through a porous 
or air-permeable layer. In both 
cases, controlled airflow changes 
the convective heat exchange within 
the envelope and therefore alters its 
effective thermal resistance. Their 
appeal lies in the ability to integrate 
insulation and thermal regulation 
within the same assembly, though 
performance depends on airflow 
control, operating energy, airtight-
ness and careful enclosure design.
•	 Phase-change material systems, 
shown in Figure 3(c), rely on latent 
heat storage rather than mechanical 
movement or airflow. As the mate-
rial changes phase between solid 
and liquid states, it absorbs and 
FIGURE 2: CONCEPTUAL ILLUSTRATION OF DYNAMIC INSULATION, SHOWING HOW THE BUILDING ENVELOPE CAN OPERATE AT DIFFERENT R-VALUES ACROSS WINTER, HOT 
SUMMER CONDITIONS AND COOLER NIGHT PERIODS.
SPRING/SUMMER 2026 17

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