Insulation material refers to a material or material composite used for building envelopes or thermal equipment, impedance heat transfer, including insulation materials and cold insulation materials. Insulation materials on the one hand meet the thermal environment of the building space or thermal equipment, on the other hand also save energy. Therefore, some countries regard thermal insulation materials as the “fifth largest energy source†after coal, oil, natural gas and nuclear energy.
Selection point
The common application types and design choices of thermal insulation materials in construction should meet the requirements of GB/T 17369-1998 "Application Types and Basic Requirements for Building Thermal Insulation Materials".
In addition to considering the thermal conductivity of the material (thermal conductivity is not greater than 0.175W / (m · K)), the water absorption, combustion performance, strength and other indicators of the material should also be considered. The performance characteristics of different insulation materials can be found in the corresponding classification guidelines.
Fine products in thermal insulation products: Naki insulation soft felt, Naki insulation board, Ruiji insulation soft felt
Insulation products that can be arbitrarily shaped: RFC shaped parts
Insulation performance of thermal insulation materials: thermal insulation performance is mainly reflected by thermal conductivity
Thermal conductivity λ = W / (m · k)
The thermal conductivity characterizes the thermal conductivity of the material under stable heat transfer conditions. The smaller the thermal conductivity value, the better.
The value of λ is 0.20 w/(mk) as the boundary value between the insulating material and the non-insulating material. Materials with λ > 0.20 w / (mk) should generally not be used as insulation materials.
Initial thermal conductivity values ​​for common materials:
Air - 0.026w / (mk)
Water - 0.552 w/(mk)
Ice - 2.2 w/(mk)
Iron - 350 w / (mk)
Ultra-fine glass wool - 0.041 w / (mk)
Polyethylene foam plastic - 0.038 w / (mk)
As the thermal insulation material grows with age, its thermal conductivity λ value also increases because any thermal insulation material absorbs moisture under normal use conditions. The thermal conductivity of water is much higher than the initial thermal conductivity of the insulating material, so the moisture in the body of the insulating material enters the water vapor (or water), which tends to increase the thermal conductivity of the material and eventually lose its thermal insulation function.
The moisture permeability coefficient δ g / (ms pa) and the moisture resistance factor u determine the service life of the insulating material.
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