In recent years, reflective building insulation coatings have been widely used as a new type of energy-saving materials. Experiments have shown that the use of thermal insulation coatings on the roof and exterior walls can effectively reduce the internal surface temperature during the summer, improve indoor comfort and reduce the power consumption of air conditioners, thus playing an important role in environmental protection and energy conservation.
Reflective thermal insulation coating is based on synthetic resin, combined with multi-functional pigments, fillers (such as hollow microspheres, high oxidation resistance, corrosion-resistant metal particles, etc.) and additives. It is applied to the surface of buildings with reflection barrier. The hot-functional coating has the advantages of good heat insulation effect, light coating quality and good durability. According to GB/T25261-2010 reflective heat-insulating coating for building, the equivalent thermal resistance of reflective thermal insulation coatings, the value of which is affected by the air conditioning (heating) time and temperature difference in summer and winter, so the equivalent thermal resistance in different regions The values ​​are also different. In this paper, through the energy efficiency measurement of reflective insulation coatings for high-rise, multi-layer and low-rise building types with body shape coefficients ranging from 0.34 to 0.44, the recommendations for the equivalent thermal resistance of reflective insulation coatings in Chongqing are proposed.
Fo—the average compressive strength of the specimen after carbonization (MPa); the average compressive strength of the fcc-comparative specimen (MPa).
At the same time, the surface of the test piece is free from cracks, delamination and falling layers, and the advantages and disadvantages of carbonation resistance are measured.
2.5.2 Thermal storage coefficient St thermal storage coefficient indicates the thermal inertia of the foam insulation board material, which refers to the property of the material against the temperature change under the action of periodic heat. Materials with large heat storage coefficients have poor resistance to temperature changes. The heat storage coefficient is an important criterion for measuring the function of the insulation board.
The heat storage coefficient can be carried out according to the GB/T17146 standard. The test piece size is: 300x100x100mm and can also be calculated by the measured thermal conductivity. According to the heat cycle of a cycle (24h), the heat storage coefficient is: Act—the thermal conductivity of the insulation board material.
The heat storage coefficient of foamed cement and foamed magnesium cement insulation board should be less than 1.2.
3 Conclusion Inorganic thermal insulation materials are the most promising materials under the premise of building insulation and fire protection materials, but both material performance and application technology need to be improved and improved. Mixin is guiding the building energy conservation policy. Under the unremitting efforts of the vast number of engineering and technical personnel, the development prospects of inorganic thermal insulation materials will be colorful.
2012.7 Wall material innovation and building energy saving 49
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