Matter has its primary properties, which enable it to describe its strength, durability and utility. One of these features is heat conduction strokes, which are more indicative of the product to retain heat. The winter period is characterized by a significant drop in temperature, while indoors remains warm and comfortable. How is this possible? The main role here is the boiler that heats the room. However, generating heat is not enough to create a cozy environment - heat must also be stored. The implementation of this assumption is on the surface of the wall, floor and ceiling of the building. It is through this surface that heat penetrates and dissolves in the environment. As much as possible, this part prevents a similar process. Sometimes they make it quite successful. Based on the laws of physics, we know that the process of heat distribution is an uneven curve. The ability of a material to perceive thermal effects is characterized by a special term, called the coefficient of thermal conductivity. The lower this figure, the less the studied materials interact with heat. At the same time, the strength and reliability of building materials does not affect its thermal conductivity in any way. For example, the products used to insulate buildings have a relatively fragile structure. For example, mineral wool, one of the main thermal insulation materials in modern construction, has a thermal conductivity coefficient of only 0.045. This value determines the excellent heat retention quality of these materials The main surface of the walls has its own thermal conductivity. Its performance depends on many factors. Among them are the characteristics of the materials themselves, the method of their installation and many others. At the same time, the thermal conductivity of the masonry is a set of any products and other criteria that make up the wall. As the value of this factor, which is guaranteed by their products, they are also completely different. The abundance of different materials that saturate our market provides a wide field for choosing products. Each of them is different in its structure and methods of creation, which cannot affect their basic parameters thermal conductivity of refractory brick kis one of the most important indicators of the quality of the built structure. And this is not surprising: after all, not only the cost of space heating, but also the level of comfort in the house depends on this coefficient. Also, thermal resistance coefficient (resistance to heat transfer), reverse thermal conductivity (higher than the first, lower than the second and vice versa) often appear in construction calculations. The thermal conductivity of the structure depends on the indicators of the type of brick used, parameters of mortar, type of masonry, construction technologies and insulation materials.
thermal conductivity of alumina bricks
Thermal conductivity (thermal conductivity) of refractory bricks, that is, the ability to transfer heat, is usually expressed by thermal conductivity. Heat transfer coefficient refers to the amount of heat transferred during the energy transfer process per unit area per unit time under unit temperature gradient. In addition to temperature factors (such as high alumina bricks, magnesia bricks, etc.), the thermal conductivity of refractory bricks is closely related to its chemical composition and organizational structure. In the preparation of refractory bricks by crystallization, the crystallization performance has a significant effect on thermal conductivity. Thermal conductivity of heavy mullite bricks refers to the heat flow rate coefficient that passes through a unit of surface area through a unit of temperature gradient. The larger the porosity coefficient, the smaller the thermal conductivity. In the production of general heating equipment, heat loss after passing through refractory bricks should be considered and the insulation effect of insulating refractory bricks needs to be calculated. For some flame-resistant thermal furnaces, such as coke furnaces, firebricks should be considered. The thermal conductivity coefficient of the refractory brick partition plate is relatively high, so the thermal conductivity coefficient of the refractory brick partition plate is one of the main indicators in thermal design. The method of measuring the thermal conductivity of refractory bricks A pure platinum wire hot wire is applied between two refractory samples with constant strength, and the heating rate of the hot wire depends on the amount of heat flow from the hot wire to the constant temperature part of the test piece. The increase in platinum wire resistance and the corresponding time change between the test resistance in the middle of the test sample. Using this method, the exact heating rate of the hot wire can be obtained. Using the Fourier formula, the heat transfer coefficient is calculated from the heating rate of the heating wire and the input power. When the bulk density is the same, the thermal conductivity of mullite insulation bricks made of foam is lower than that of pressure or machine extrusion. Thermal conductivity is closely related to product porosity. The increase in porosity causes an increase in the surface area of solid gas and phonon scattering of solid phase thermal conductivity, and as a result, it reduces the thermal conductivity of the refractory. At the same time, thermal conductivity is closely related to porosity. At high temperature, the movement of gas molecules intensifies, the probability of collision increases and the mean free path decreases. thermal conductivity of glass wool It is white and yellow in samples. This material is produced by melting glass and turning it into fine fibers. These fibers are in the form of rolls or panels. Glass wool is fire resistant. Glass wool is easy to cut and install The thermal conductivity coefficient of glass wool is 0.055 times the thermal conductivity coefficient of brick and cement and 0.05 times the thermal conductivity coefficient of our three. thermal conductivity of kaolin brick Kaolin brick, the thermal conductivity of which has a relatively wide range of values, is the most popular and used material. Such popularity of this product is due to its utility and ease of use. In addition, prefabricated buildings made of similar materials have excellent characteristics of stability and strength. The thermal conductivity of brick in such conditions falls into the background. To create more comfortable conditions inside the building, additional insulation is produced using special insulation materials with the lowest coefficient value. Silicate brick (standard) cannot be used for furnaces and fireplaces, because its temperature is very resistant. The maximum heat it can withstand is 550 degrees (if analogues are improved), while the surface of the furnace heats up to 700 g. thermal conductivity of wood The wood texture depends on the anatomical structure of the wood. Coniferous wood, which has a simple structure, has a thin texture, hardwood, which has a more complex structure and has a varied texture. The use of wood depends on the cutting direction, the width of the rings, the difference in the color of the summer and spring forest, the rays and the direction of the fibers. The most brilliant texture is obtained by tangent cutting. Coniferous forests have a desirable texture of pine and pine and rosewood, hardwoods of porous wood with characteristic curved rays; Mezhventsovy jute insulation retains heat 3.5 times better than pine wood. In other words, the joints between the logs, provided they are filled with welding insulation, are the "hottest places" in the wall. Water that fills cell cavities, vascular capillaries and intercellular spaces is called capillary or loose. The water deposited in the cell membrane and in the extracellular spaces has hydroxy or is combined with water. Forests account for an average of about 30% of wetlands. The largest amount of free water depends on the type of wood. If the wood contains only moist water, this is the so-called fiber saturation point