We know that there are three basic forms of heat transfer:
conduction, radiation, and convection. . As long as there is a
temperature difference inside or between objects, heat energy must be
transferred from high temperature to low temperature in one or more of
the above three ways.
In broken bridge aluminum doors and windows, the "bridge" in the
name of "broken bridge aluminum" refers to the "cold and hot bridge" in
the sense of material science. The "cold and hot bridge" is disconnected
by using heat insulation strips with lower thermal conductivity, such as
PA66 nylon strips, so it is called "broken bridge". The thermal
conductivity of the thermal insulation aluminum alloy profile doors and
windows is 40-70% lower than that of the non-thermal insulation aluminum
alloy profile doors and windows.It should be noted that the insulation
strip here effectively prevents heat conduction.
With the continuous development of the door and window market, the
insulation strip is designed wider and wider, and the air contained in
the broken bridge is more and more, which brings a new problem-heat
convection transfer. In order to solve this problem, the foaming machine
manufacturer has given a solution, which uses the traction method to
pour the Yi-An-Neng foam with a thermal conductivity of ≤ 0.024 W/ (mK)
into the cavity of the heat insulation strip.There is no air in the heat
insulation cavity, and the transfer of heat convection is fundamentally
blocked. After the experiment, the insulation effect was further
improved by 28.6%.