Civil Engineering Reference
In-Depth Information
Fig. 14 Illustration of
representative elementary
volume
Fig. 15 Contributions of the
three main heat transfer
modes for mineral wool
5.2.1 Heat Transport
Over the decades, significant process has been made in understanding the energy
transport properties of fibrous materials (Daryabeigi
2000
; Lee and Cunnington
2000
; Verschoor et al.
1952
; Hager and Steere
1967
; Larkin and Churchill
1959
).
Heat transport through fibrous insulation involves multiple heat transfer mecha-
nisms of conduction, natural convection and radiation. The relative contributions
of the various modes of heat transfer vary during re-entry. In high temperature,
radiation dominates which is complicated because of the complex structures of the
fibres and the inherent complexities associated with the transport mechanism itself
(Zhang et al.
2008
). Figure
15
illustrates the contributions from all three major
heat transfer modes for mineral wool (RIL 155,
1984
).
