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Central air-conditioning insulation

Release time：2019-08-20 | Source：HUA LI JI DIAN.

At present, the central air-conditioning system, which uses advanced equipment and corresponding supporting equipment in various types of buildings, has become one of the important symbols of modern building technology, and is an indispensable and important infrastructure for modern buildings to create a comfortable and efficient working and living environment.

1, the central air conditioning system needs to consume energy

Central air conditioning system needs to consume a lot of energy, its energy consumption accounts for about 60% of the total energy consumption of the building, so the air conditioning system needs to save energy, save operating input. The reasonable choice of insulation material thickness and products, as well as strict insulation construction control is an effective way to save energy in the central air conditioning system.

In addition, the installation of central air-conditioning buildings for office buildings, hotels, hotels, large and medium-sized shopping malls, such as higher requirements. Air conditioning insulation is directly related to daily use, fire protection performance and initial investment, so it is necessary to pay enough attention to the choice and construction of insulation. For example, if the air-conditioning system if the insulation problems, in operation may be exposed, resulting in smallpox drips, wall seepage mold and other phenomena, seriously affectthes the perception and use of functions, and cause certain economic losses.

2,Choice of insulation materials

The performance of insulation material directly affects the energy consumption, weight, fire resistance, construction and installation conditions and engineering cost of HVAC system, so it is necessary to analyze the performance of air conditioning insulation material and make a reasonable choice.

With the increase of the demand for insulation materials, there are many domestic manufacturers from abroad to introduce technical equipment for insulation material production. A wide variety of insulation materials, insulation performance is different, the range of optional is also greatly increased.

3,Central air-conditioning insulation material classification

The following is a brief analysis of the performance of several air-conditioning insulation materials commonly used at present, in order to refer to the central air-conditioning engineering insulation material selection.

Glass cotton

Glass cotton belongs to a category of fiberglass, is an artificial inorganic fiber. The use of quartz sand, limestone, dolomite and other natural ore as the main raw materials, with some soda, borax and other chemical raw materials meltinto into glass. In the melting state, with the help of external force blow-up-type floc-shaped fine fibers, fibers and fibers are three-dimensional cross, wrapped together, showing many small gaps. This gap can be thought of as a pore. Therefore, glass cotton can be regarded as porous material, with good insulation, sound absorption performance.

Rock cotton

Non-combustible materials, its fire, anti-aging and anti-chemical properties are good, the disadvantage is poor water resistance, construction must pay attention to good moisture treatment. Rock cotton because of its moderate insulation performance, low price, for the general standard and cost of limited projects, there is still a certain degree of competitiveness, it is not appropriate to exclude it.

Polyphenyl Eco-FoamPhenol

Products for closed porpoise phenolic solid insulation material, with flammable, fire-free, surface only carbonized phenomenon, no melting no drops, no cracking, unchanged type, no obvious contraction, no toxic and harmful gases; Easy to cut, installation, outer layer such as the use of clamping reinforced aluminum foil and other surface, can be no need to add a metal hard shell, saving overall cost investment.

Self-extinguishing polystyrene foam

The insulation performance of the material is still good, the main problem is that the maximum use temperature is 70 degrees C, and the winter air conditioning water supply design temperature (60 to 65 degrees C) has been quite close. After engineering investigation, it was found that the central air-conditioning pipe using self-extinguishing polystyrene foam tile insulation, after a period of time, insulation tile deformation and separation from the pipe phenomenon. The reason for this is that its heat resistance is poor, and the air-conditioned water supply sometimes exceeds 70 degrees C. Therefore, it is not suitable for use in heating and heating dual-use central air-conditioning water system insulation.

Flame retardant polyethylene foam (PEF)

Flame retardant polyethylene foam is light in weight, has a small thermal conductivity, stable size and good water resistance. Its product profile thickness of 6-40mm, easy to choose.

Rubber sponge insulation

Rubber sponge with soft, anti-bending, cold, heat-resistant, flame retardant performance (B1 grade refractory material), low thermal resistance, shock absorption, sound absorption and other excellent performance. At the same time, the construction is convenient, clean and beautiful appearance, no pollution, is a high-quality new insulation material.

Selection in the actual construction

Air conditioning system insulation should be selected low thermal conductivity, good fire resistance, water absorption and moisture absorption coefficient is small, construction is convenient and can meet the use of temperature requirements of insulation materials. At the same time, we should take into account the cost of the project and other factors. However, by many years of construction experience and related information, our domestic insulation materials overall performance and Alois and other foreign products have a certain gap, even the performance of the various domestic insulation materials manufacturers their own products are not the same. When choosing insulation materials, if the use of too high-grade, it is difficult to control the cost of engineering;

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