Cold Link Africa July August 2025 | Page 17

Often overlooked, insulated panels are complex marvels of engineering, silently safeguarding everything from fresh produce to critical data.
INCORPORATING COLD CHAIN
FEATURE

Beyond the surface: the unseen world of insulated panels By Eamonn Ryan

Often overlooked, insulated panels are complex marvels of engineering, silently safeguarding everything from fresh produce to critical data.

Insulated panels, often called sandwich, composite or structural insulated panels, are far more complex than they

appear. While they might look similar
across suppliers, their configurations and
material compositions vary significantly.
Understanding these differences requires
specialised knowledge.
In the cold chain, insulated panels
are critical for maintaining temperature
separation, reducing the energy demands
on refrigeration systems. Imagine trying to
cool a steel shed exposed to the midday
growing environments, display fridges and transportation. Essentially, they ' re vital wherever controlled conditions are needed to prevent product decay and ensure hygiene.
South Africa has seen a boom in cold storage and distribution centres, attracting international investment and higher standards. This growth benefits local manufacturers who have embraced technology and global standards, pushing boundaries with facilities featuring walls up to 38m high in some cases. The
facings or‘ foam-in-place’ injection, where the core material expands to fill a cavity.
However, the devil is in the detail. Both core and skin materials come in various forms, directly impacting the final product ' s quality. Panel thicknesses range from 25mm to 300mm, but density is also crucial for thermal properties. Skins, from 0.25mm to several millimetres’ thick, can be composites of different metals. Lower quality can lead to premature corrosion or compromised structural integrity. Beyond protecting the insulation, skins offer weather protection
INSTALLATION AND JOINING TECHNIQUES
Wall panels can be freestanding or
interlocked using various joining techniques
or installed with full frame support.
They can also serve as wall cladding
on existing concrete structures. Ceiling
panels typically rely on wall panels for
support, supplemented by hangers or
steel cables. Both wall and ceiling panels
come in different span lengths, with local
production limited primarily only by transport
sun— panels make this far more efficient by
managing heat load.
While commonly associated with
produce storage, their applications extend
across the cold chain: cold and freezer
rooms, food production and preparation
facilities, abattoirs, medical rooms,
e-commerce surge has also boosted the transportation sector, driving demand for these panels in home delivery services.
At its core, an insulated panel is simple: a core material‘ sandwiched’ between two metal‘ skins’. In South Africa, production typically involves bonding pre-cut blocks to
( especially from the harsh South African sun), hygienic surfaces and fire resistance, thanks to various coatings.
Fire risk ratings and optimal panel thickness / core choice based on application and geography are extensively covered in industry resources and online studies.
At its core, an insulated panel is simple: a core material‘ sandwiched’ between two metal‘ skins’.

COLD LINK AFRICA • July / August 2025 www. coldlinkafrica. co. za 17