Thermal insulation
From Wikipedia, the free encyclopedia
Mineral wool Insulation,
1600 dpi scan against the grain Thermal insulation is the reduction of
heat transfer (the transfer of thermal energy between objects of
differing temperature) between objects in thermal contact or in range of
radiative influence. Thermal insulation can be achieved with specially
engineered methods or processes, as well as with suitable object shapes
and materials.
Heat
flow is an inevitable consequence of contact between objects of
differing temperature. Thermal insulation provides a region of
insulation in which thermal conduction is reduced or thermal radiation
is reflected rather than absorbed by the lower-temperature body. The
insulating capability of a material is measured with thermal
conductivity (k).
Low
thermal conductivity is equivalent to high insulating capability
(R-value). In thermal engineering, other important properties of insulating materials are product density (ρ) and specific heat capacity (c).
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