{"id":974,"date":"2022-10-05T04:33:57","date_gmt":"2022-10-05T04:33:57","guid":{"rendered":"https:\/\/nanoflex.com.vn\/?p=974"},"modified":"2022-10-05T04:34:01","modified_gmt":"2022-10-05T04:34:01","slug":"glass-wool-used-in-insulation","status":"publish","type":"post","link":"https:\/\/nanoflex.com.vn\/en\/glass-wool-used-in-insulation\/","title":{"rendered":"GLASS WOOL USED IN INSULATION"},"content":{"rendered":"

\"\"GLASS WOOL<\/a> USED IN INSULATION<\/p>\n

Glass wool (originally also known as fiberglass<\/a>) is an insulating material made from fiberglass arranged using adhesives into a texture similar to wool.Glass wool and stone wool are produced from mineral fibers and are therefore often referred to as “mineral wool”.\u00a0Mineral wool is the common name for fiber materials formed by spinning or drawing molten minerals.\u00a0Glass wool is a molten glass furnace product at a temperature of about 1450 \u00b0 C. From molten glass, fibers are spun into fibers.<\/span><\/p>\n

 <\/p>\n

\"\"<\/span><\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Nanoflex<\/a> sheet glass wool<\/span><\/p>\n

The process is based on spinning molten glass fiber in a high-speed spinning head just like the process used to produce cotton candy.\u00a0During fiberglass spinning, a bonding agent is injected.\u00a0Glass wool is then produced in rolls or sheets, with different mechanical and thermal properties.\u00a0It can also be produced as a material that can be sprayed or applied topically, on insulated surfaces.<\/span><\/p>\n

Applications of glass wool include structural insulation, pipe insulation, filtration and sound insulation.\u00a0Glass wool is a versatile material that can be used to insulate walls, roofs and floors.\u00a0It can be a liquid filling material, blown into the attic, or, together with an active adhesive is sprayed on the underside of the structures.\u00a0During the installation of glass wool, it needs to be kept dry at all times, since an increase in humidity causes a significant increase in thermal conductivity.<\/span><\/p>\n

Thermal conductivity of glass wool.<\/a><\/span><\/p>\n

Thermal conductivity is defined as the amount of heat (in watts) that is transmitted over an area of a material of a certain thickness (in meters) due to temperature differences .\u00a0The lower the thermal conductivity of the material, the greater the resistance to heat transfer of the material and therefore the greater the efficiency of the insulation.\u00a0<\/span><\/p>\n

The characteristic thermal conductivity value for glass wool fibers is between 0.023 and 0.040W\/m \u2219 K.<\/span><\/p>\n

\u00a0In general, insulation is mainly based on the very low thermal conductivity of gases .\u00a0Gases have poor thermal conductivity properties compared to liquids and solids, and therefore produce good insulation if they can be trapped (for example in a foam-like structure).\u00a0Air and other gases are generally good insulators.\u00a0But the main benefit is in the absence of convection.\u00a0<\/span>
\n\u00a0Therefore, many insulating materials (e.g. glass wool) work simply by having a large number of gas-filled bags, preventing large-scale convection.<\/span><\/p>\n

\u00a0The alternation of airbags and solid materials causes heat to be transmitted through multiple interfaces, causing the heat transfer coefficient to drop rapidly. <\/span><\/p>\n

\u00a0Example – Glass insulation:<\/span><\/p>\n

\u00a0A major source of heat loss from a house is through walls.\u00a0Calculate the speed from thermal passage through a wall with an area of 3 mx 10 m (A = 30 m 2 ).\u00a0The wall is 15 cm (L 1 ) thick and it is made of bricks with thermal conductivity of k 1 = 1.0 W \/ mK (poor heat insulator).\u00a0Suppose that, indoor and outdoor temperatures are 22 \u00b0 C and -8 \u00b0 C, and the coefficients of convective heat transfer inside and outside are h 1 = 10 W \/ m 2 K and h 2 = 30 W \/ m 2K, respectively. \u00a0\u00a0Note that, these convection coefficients are highly dependent on ambient and internal conditions (wind, humidity, etc.).<\/span><\/p>\n

\u00a0\u00a0\u00a0Calculate the heat flux (heat loss) through this non-insulated wall.<\/span><\/p>\n

Now suppose insulation on the outer side of this wall.\u00a0Use 10 cm thick insulated glass wool (L2 ) with a thermal conductivity of k2 = 0.023 W \/ mK and calculate the heat flux ( heat loss ) through this composite wall.<\/span><\/p>\n

\u00a0\u00a0\u00a0Solution:<\/span><\/p>\n

As has already been written, many heat transfer processes involve mixed systems and even involve a combination of both conduction and convection .\u00a0With composite systems, it is usually convenient to work with an overall heat transfer coefficient, called a U-factor.\u00a0The element U is defined by an expression similar to Newton’s law of cooling:\u00a0<\/span><\/p>\n

\u00a0\u00a0\u00a0The overall heat transfer coefficients are related to the total heat resistance and depend on the shape of the problem.<\/span><\/p>\n

Ceiling wall:<\/span><\/p>\n

Assuming one-way heat transfer through a flat wall and ignoring radiation, the overall heat transfer coefficient can be calculated as follows:\u00a0<\/span><\/p>\n

\u00a0\u00a0The overall heat transfer coefficients are then:<\/span><\/p>\n

U = 1 \/ (1\/10 + 0.15 \/ 1 + 1\/30) = 3.53 W \/ m 2 K<\/span><\/p>\n

Thermal flux can be calculated simply as follows:<\/span><\/p>\n

q = 3.53 [W\/m2 K] x 30 [K] = 105.9 W\/m2<\/span><\/p>\n

The total heat loss through this wall will be:<\/span><\/p>\n

q loss = q.\u00a0A = 105.9 [W\/m2 ] x 30 [m2 ] = 3177W<\/span><\/p>\n

\u00a0\u00a0Composite walls with insulation<\/span><\/p>\n

Assuming one-way heat transfer through a composite wall, without thermal contact resistance and disregard for radiation, the overall heat transfer coefficient can be calculated as follows:<\/span><\/p>\n

The overall heat transfer coefficients are then:<\/span><\/p>\n

U = 1 \/ (1\/10 + 0.15 \/ 1 + 0.1 \/ 0.023 + 1\/30) = 0.216 W \/ m 2 K<\/span><\/p>\n

\u00a0\u00a0Thermal flux<\/a> can be calculated simply as follows:<\/span><\/p>\n

q = 0.216 [W\/m2 K] x 30 [K] = 6.48 W\/m2<\/span><\/p>\n

The total heat loss through this wall will be:<\/span><\/p>\n

q loss = q.\u00a0A = 6.48 [W\/m2 ] x 30 [m2 ] = 194 W<\/span><\/p>\n

\u00a0\u00a0As can be seen, the addition of thermal insulators significantly reduces heat loss.\u00a0It must be added, the subsequent addition of insulation does not cause such high savings.\u00a0This can be seen more clearly from the heat resistance method, which can be used to calculate the heat transfer through composite walls.\u00a0The steady rate of heat transfer between two surfaces is equal to the temperature difference divided by the total thermal resistance between those two surfaces.<\/span><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

GLASS WOOL USED IN INSULATION Glass wool (originally also known as fiberglass) is an insulating material made from fiberglass arranged using adhesives into a texture similar to wool.Glass wool and stone wool are produced from mineral fibers and are therefore often referred to as “mineral wool”.\u00a0Mineral wool is the common name for fiber materials formed […]<\/p>\n","protected":false},"author":1,"featured_media":972,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,17,12],"tags":[91,92,53],"class_list":["post-974","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-internal-news","category-general-news","category-news","tag-glass-wool","tag-thermal-conductivity-of-glass-wool-thermal-conductivity-is-defined-as-the-amount-of","tag-nanoflex-en"],"acf":[],"yoast_head":"\nGLASS WOOL USED IN INSULATION - Nanoflex High Quality Insulation<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nanoflex.com.vn\/en\/glass-wool-used-in-insulation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GLASS WOOL USED IN INSULATION - 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