Streszczenie: Low-emissivity coatings on glass surfaces, inert gas instead of air between glasses, and double-glazed
windows are usually used to reduce heat loss from a room through windows. This effect can also be achieved by
installing two double-chamber windows in one window opening at a certain distance from each other. This work uses
numerical modelling to study the characteristics of heat transfer through a system of two two-chamber windows. The
distributions of temperature and airflow velocity due to natural convection in the chambers of double-chamber windows
and the space between the windows are analyzed. The distributions of temperatures and heat fluxes over the surfaces
of windows are determined depending on the distance between the windows. The dependences on the distance between
the windows of radiation, convective, and total heat flow through a system of two double-chamber windows are studied.
It is shown that two double-chamber windows located at a certain distance from each other make it possible to increase
the heat transfer resistance compared to one two-chamber window without a low-emission coating by 2.6...2.8 times.
As the distance between windows increases, a given system's overall heat transfer resistance increases. However, this
increase becomes insignificant if this distance is greater than 80 mm
Abstract: Low-emissivity coatings on glass surfaces, inert gas instead of air between glasses, and double-glazed
windows are usually used to reduce heat loss from a room through windows. This effect can also be achieved by
installing two double-chamber windows in one window opening at a certain distance from each other. This work uses
numerical modelling to study the characteristics of heat transfer through a system of two two-chamber windows. The
distributions of temperature and airflow velocity due to natural convection in the chambers of double-chamber windows
and the space between the windows are analyzed. The distributions of temperatures and heat fluxes over the surfaces
of windows are determined depending on the distance between the windows. The dependences on the distance between
the windows of radiation, convective, and total heat flow through a system of two double-chamber windows are studied.
It is shown that two double-chamber windows located at a certain distance from each other make it possible to increase
the heat transfer resistance compared to one two-chamber window without a low-emission coating by 2.6...2.8 times.
As the distance between windows increases, a given system's overall heat transfer resistance increases. However, this
increase becomes insignificant if this distance is greater than 80 mm
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