The difference between the external wall and the traditional heat preservation material

The essential difference between the reflection of the external wall of the external wall and the traditional thermal insulation material

Exterior wall reflective heat insulating coatings are mainly used in the south of China, which is mainly used to reflect the solar heat and prevent the building wall body to absorb and store a large amount of solar heat. As is known to all, the hot summer, the roof and the wall body by the sun, a thick roof plate and cement brick body will absorb and store a lot of heat, even though the sun set up, until late at night, these stored heat has not been distributed, causing the room is still very hot, waste a lot of energy. And the south building, the winter is not too cold, generally do not use heating, so the insulation is not important, there will not be a waste of energy. Vertical on the south building is more need to prevent the absorption of solar heat, will the external wall reflective thermal insulation coating can reflect more than 90% of the solar energy, is painted buildings almost do not absorb solar heat, so as to achieve the purpose of energy conservation. Its main heat insulation is the solar reflectance. Traditional heat preservation material is to absorb the solar energy, and its thermal conductivity is small to block the heat transfer, so the traditional thermal insulation material is the main heat conduction coefficient.

Two, functional control

First of all clear the south building energy saving is mainly to prevent the building of the absorption of solar heat in the summer.

1. will the external wall reflective paint can reflect more than 90% of the solar heat, buildings almost do not absorb the solar heat; this will be the use of external wall reflective heat insulation coating to achieve the purpose.

2. the traditional heat insulation material will absorb solar energy, and its thermal conductivity is small to prevent the heat transfer to the building; but this heat conduction coefficient of small thermal insulation material is not cost-effective products can be applied.

Three, the detection of heat insulation effect

1. South building thermal insulation material energy saving effect of the test should be in sunny days, the building surface and the use of thermal insulation materials for buildings with no heat insulation materials of the indoor and surface temperature difference, rather than the thermal conductivity, because the actual effect is more accurate than the detection coefficient.

2. will reflect heat insulation coating energy-saving effect detection should be in a sunny day, the building wall surface and reflective heat insulation coating of the wall surface and the wall is not coated with reflective heat insulation coating wall or wall surface temperature difference; do not have to test the sun reflection ratio, direct measurement of actual effect, only with digital temperature measuring instrument can detect the effect, simple and quick.

Four, the effect of the reflection heat insulation material testing, will produce the following misleading and difficult

1. although the invention and production of reflective thermal insulation coating has been ten years, but the exterior wall reflective heat insulation paint in 2006, and in 2008 introduced the industry standard, and now all exterior wall insulation measures in the design of traditional thinking using the traditional heat insulation material, but in fact it is the national non North and south, the main insulation material is the heat conduction coefficient. The smaller the thermal conductivity of the traditional thermal insulation material is, the better. Because the drawings according to the thermal conductivity coefficient to design, so the acceptance of the thermal conductivity coefficient to acceptance, resulting in the use of reflective thermal insulation coatings in the acceptance of the building, will be tested on the thermal conductivity does not meet the requirements. In fact, the main heat insulation performance index is the solar reflectance.

2. rainy days or cloudy days it is difficult to reflect or verify the actual effect of reflective heat insulating coatings.

3. the provincial level inspection agencies at present there is no instrument can test the sun reflection ratio.

Author: Nantou Town, Zhongshan City, will shun paint factory (copyright, without permission, shall not be reproduced)