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thermal resistance
   Discussion: thermal resistance
qzz10011 · 8 years, 5 months ago
Exterior insulation, thermal insulation system is placed on the outside walls, making the building construction methods to achieve thermal insulation. Since the outer insulation is placed outside the external how to install composite deck walls of thermal insulation system, so that the temperature difference between the role of the main structure suffered significant decline, reducing the temperature deformation, the structure of the wall and can play a protective role in effectively blocking the cold (hot) bridge It is conducive to extend the life of the structure.Therefore, from the stability of the structure, it is conducive to the outer insulation has obvious advantages, in the case of an optional external insulation should be preferred. However, since the outer insulation system is placed in the outer walls, various factors bear directly from nature, and thereforeheat release rate for plastic decking the external wall insulation system put forward higher requirements. To solar radiation and ambient temperature changes for its impact, as the insulation layer on the crack resistance of the protective layer is only 3mm ~ 20mm, and insulation material having a large thermal resistance, and therefore under the same conditions of heat, external insulation anti- The protective layer cracking temperature changes faster than the outer case without insulation body temperature changes faster pour 8 to 30 times.Therefore, the protective layer cracking flexibility and weatherability crack resistance of external thermal insulation system plays a key role. Polystyrene board thin touch insufficient gray outer insulation structural design exist: Such external insulation usually pasted outside of France when fixed in the wall, and then the insulation board and reinforcing mesh Mama mortar surface mortar shop presses, at present, such practices are common, however, cracks also very much. Factors protective layer from thermal stress cracking point of view, the system polystyrene board insulation layer is only 3mm cracking mortar composite mesh, the thermal conductivity of expanded polystyrene board is 0.042W (mK), while cracking mortar thermal conductivity of 0.932W (mK), thermal conductivity of the two perforated plastic decking Sri Lanka materials differ 22 times. Because polystyrene board insulation layer so that the heat resistance greatly protective layer easily by conduction diffusion, so that when the sun is directly affected by the heat accumulated in cracking mortar layer, its surface temperature will reach 50 ℃ (Dalian), the case Suddenly rain will warm the temperature dropped to around 15 ℃, temperature up to 35 ℃, such as temperature changes and is affected by diurnal and seasonal outdoor temperature of flexibility combined Mesh durability plaster mortar made considerable high requirements. Another factor to consider is that when the temperature of polystyrene board exceeds 70 ℃, polystyrene board will have irreversible thermal shrinkage deformation, resulting in more serious cracking deformation, the situation in hot, dry areas are quite obvious.
vynalori · 3 years, 6 months ago
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