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    Home > Coatings News > Paints and Coatings Market > Wo niushan energy saving . . . Insulation material design thickness.

    Wo niushan energy saving . . . Insulation material design thickness.

    • Last Update: 2020-10-16
    • Source: Internet
    • Author: User
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    How exactly is the heat transmission coefficient calculated? What does the design thickness of the insulation have to do with it? Why is the same 65% energy-saving standard requirements, the North and the South insulation material design thickness is very different?
    the heat transmission coefficient of the peri-enclosed structure
    it is assumed that a peri-enclosed structure from the inside out in turn by material 1, material 2 ... Material n composition, if the thickness of each material is known to be δ and the thermal conductivity coefficient (and correction coefficient α), then the heat transmission coefficient K value of the enclosing structure can be calculated as follows:
    the above calculation process is ideal The calculation of the heat transmission coefficient K value of the enclosing structure composed of the homogeneity material is actually much more complex than this model, and the non-homogeneity composite enclosing structure is usually considered as the proportion of each area, correction, thermal bridge line heat transmission coefficient influence and other factors.
    Through the above ideal model, we can also note that if you want to reduce the final peri-enclosed structure of the heat transmission coefficient K value to achieve its standards, in the material selection design, one can choose a smaller thermal conductivity of the material, the other can increase the thickness of the material design.
    insulation material thickness calculation
    enclosing structure is usually composed of multi-layer material structure, non-insulation material thermal conductivity is generally larger, thickness is relatively fixed, adjustable range is not . Therefore, the main control objectives of energy-saving design are basically on insulation materials, generally through energy-saving design software simulation calculation, and then by adjusting the design type and thickness of insulation materials to meet the final result requirements.
    addition, when the design thickness of the insulation material of a project energy saving scheme is known, the design thickness of the insulation material to be replaced can also be obtained through a simple proportional conversion relationship (the principle is equivalent thermal resistance replacement).
    such as the original design using foaming cement slabs, design thickness of 1 x 50mm, material thermal conductivity of 1 x 0.065, correction coefficient alpha 1 x 1.20. If you want to replace the graphite polybenzene plate, the material thermal conductivity coefficient of 2 x 0.033, the correction coefficient alpha 2 x 1.05, then the replacement of the graphite polyphenyl plate design thickness of 2 should be:
    according to the product size specifications of insulation materials, as well as to ensure that the thermal coefficient of the enclosing meet the standard requirements, the design thickness of the graphite polyphenyl plate is 25mm.
    Three are regional differences in thickness
    The same is 50% or 65% energy-saving design standards, the north may have to use about 100mm molded polyphenyl plate, and the south as long as the use of 30-50mm molded polyphenyl plate is enough, why different regions of the insulation layer design thickness difference is so large?
    the knowledge points learned, it is not difficult to find that the main reason is that the climate conditions in different regions are different, for the local energy-saving design standards in the heat transmission coefficient requirements are not the same.
    the same low-rise buildings, Hebei may require a design heat transmission coefficient of less than 0.4, while Jiangsu may require less than 1.0. Since the target K values are so wide, it is not difficult to understand that the thickness of the insulation layer design is different. So in general, the design thickness of insulation materials or according to local conditions, in line with the specifications of the main.
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