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....
Tuesday, June 11, 2013
Clothing of Thermal insulation
Clothing can help control the temperature of the human body. To offset high ambient temperature insulation,
clothing can enable sweat to evaporate (thus permitting cooling by
evaporation). The billowing of fabric during movement can create air
currents that increase evaporation and cooling. A layer of fabric then
insulates slightly and can help keep skin temperatures to a cooler
level.
To
combat low ambient temperatures, a thick insulation is desirable to
reduce conductive heat loss. Other things...
Mechanical systems
Thermal insulation applied to exhaust component by means of plasma spraying
Space
heating and cooling systems distribute heat throughout buildings by
means of pipe or ductwork. Insulating these pipes using pipe
insulationreduces energy into unoccupied rooms and prevents condensation
from occurring on cold and chilled pipework.
Pipe insulation is also used on water supply pipework to help delay pipe freezing...
Factors influencing performance
Insulation performance is influenced by many factors the most prominent of which include:
Thermal conductivity ("k" or "λ" value)
Surface emissivity ("ε" value)
Insulation thickness
Density
Specific heat capacity
Thermal bridging
It
is important to note that the factors influencing performance may vary
over time as material ages or environmental conditions change.
Calculating
requirements Industry standards are often rules of thumb, developed
over many years, that offset many conflicting goals: what people...
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