Air-conditioning insulation air duct, as the name implies, is a special spare part that is used in conjunction with ordinary vertical air conditioners or hanging air conditioners. On the one hand, the material selection requirements of this product are relatively strict, and an extra layer is often packaged on the outer surface Composite film, so it can achieve the purpose of heat preservation and heat insulation. Secondly, compared with ordinary plastic hard pipes, this air-conditioning heat preservation air duct can be bent freely, so it can be adjusted according to the actual structure and area. , then let’s learn about various aspects of air-conditioning insulation air ducts from the following sections.
1. How to choose air conditioning insulation air duct
Reasonable selection of suitable insulation materials and strict control of insulation construction are important ways to save energy in central air-conditioning systems. The main performance indicators of thermal insulation materials are as follows: thermal conductivity, density, moisture resistance factor, fire resistance, installation performance, etc.
1. Thermal conductivity
Thermal conductivity is the basic index to measure the quality of thermal insulation materials, and determines the thermal insulation performance of materials. Generally, materials lower than 0.2W/(m·K) can be used as thermal insulation materials. GB/T 17794 clearly stipulates that: at 40°C, thermal The thermal conductivity of the insulation material is not greater than 0.041W/(m·K); at 0°C, the thermal conductivity of the insulation material is not greater than 0.036W/(m·K); at -20°C, the thermal conductivity of the insulation material is not greater than 0.034W/(m·K). At the same time, the thermal conductivity is also an important parameter to determine the thickness of the insulation layer. When the insulation thickness of the pipe is not selected properly, condensation water will be generated on the outer surface of the insulation layer, resulting in water dripping on the surface of the air duct, water seepage and mold on the ceiling, etc., which seriously affect the indoor air supply environment.
2. Humidity resistance factor
The moisture resistance factor is a key indicator to measure the ability of thermal insulation materials to resist water vapor penetration, and determines the service life of materials. GB/T 17794 clearly stipulates that the moisture resistance factor μ of thermal insulation materials should not be less than 1500. As the number of years of use increases, materials with a small moisture resistance factor are more likely to infiltrate water vapor, resulting in a sharp increase in the thermal conductivity of the insulation material, thus losing the insulation effect. Therefore, open-cell insulation materials such as glass wool need to be laid with a moisture-proof layer to prolong the service life of the material.
3. Fire performance
Up to the fire performance standard is the basic requirement for the safe use of insulation materials, and the fire protection requirements of pipeline insulation materials must reach the flame retardant B1 level. The selection of thermal insulation materials with poor fireproof performance may leave a safety hazard for the entire central air-conditioning system. Once a fire occurs, the fire may spread rapidly and cause huge economic losses.
4. Installation performance
Installation performance is an important factor that determines construction efficiency and construction quality. Improper selection of insulation materials will seriously affect construction progress and construction quality. Improper installation may also cause condensation in the system. Therefore, it is very important to choose a suitable and easy-to-install insulation material.
2. How to choose the thickness of the insulation material used in the air-conditioning pipeline?
The key to investigating whether the quality of the project reaches the qualified (excellent) standard depends on whether the quality of the insulation reaches the qualified (excellent) standard. The quality of the insulation depends not only on the construction level of the insulation, but also on the selected insulation material. Air-conditioning insulation should be Choose thermal insulation materials with low density, small thermal conductivity, good waterproof and fireproof performance, meet the requirements of operating temperature range, and convenient construction. The specific selection should be comprehensively considered according to the project grade and cost, and the actual performance and quality of the product should be paid attention to.
Generally, the water pipe of Φ20-32mm is 2.5 cm thick. The water pipe of Φ40-80mm is 3 cm. The water pipe above Φ100mm is 4 cm. The specific regulations are calculated by taking the most economical value of thermal insulation and anti-condensation. Generally, the insulation of chilled water pipes in the computer room is about 30-40mm, and it will be thicker outdoors, and the environment can be thinner if there is an air conditioner.
1. The thickness of the insulation is related to the material used for insulation and the temperature of the fluid in the pipeline to be insulated.
2. There are a lot of thermal insulation materials now, some of which are good and expensive, and inferior ones are relatively cheap, but there is one purpose: it is better not to produce condensation on the surface of the thermal insulation material.
Post time: Feb-28-2023