What indicators should be used to determine the thickness of air conditioning box panels?

The thickness of the air conditioning box board should be determined based on the box size, operating pressure, mechanical strength, thermal insulation and installation environment. The thickness of the outer steel plate, the thickness of the inner steel plate and the total thickness of the entire sandwich panel are different parameters. It is easy to make it impossible to compare different plans by only writing 'box plate thickness' when making an inquiry.

First explain what needs to be met, and then compare the thickness

When the box panel span is large or the pressure is high, the strength is also affected by the frame, reinforcing structure and connection method. Insulation performance also depends on the insulation material, thickness, seams and thermal bridging. It cannot be directly inferred that the thermal insulation, sound insulation or deformation resistance of the entire machine will be improved simultaneously by increasing the thickness of a certain layer of steel plate.

Structural parameters include internal and external panel materials and thickness, frame and maximum board width; insulation parameters include core material, total thickness and design corresponding to environmental conditions; verification conditions must state deformation, sealing and corresponding inspection data under agreed pressure. The three types of parameters correspond to different performances, and you cannot just give a total thickness number. For the structural differences between double-layer and single-layer box panels, please refer toWhat are the differences between double-layer box boards and single-layer box boards used in air-conditioning boxes?。

Mechanical strength is not just determined by panel thickness

The box needs to maintain shape stability under operating pressure. The span of the panel, frame spacing, stiffeners and connection methods will all affect the deformation. If a large-size unit only increases the thickness of the panel without adjusting the frame, local areas may still bulge or dent. The force directions of the negative pressure section and the positive pressure section are different, and the box structure needs to be checked separately.

The air leakage rate of the box is related to the sealing structure, please refer toUnder what pressure conditions should the air leakage rate of air conditioning boxes be compared? . The sealing status of the access door and panel joints also affects the actual air tightness performance. Please refer toWhen a horizontal air conditioning box is placed against a wall, which side should be left for inspection?。

The insulation thickness should be combined with the operating conditions and environment

The function of the insulation layer is to reduce heat exchange inside and outside the box and prevent condensation on the outer surface. The insulation thickness needs to be determined based on the supply air temperature, ambient temperature and humidity and the thermal conductivity of the core material. In low-temperature air supply or high-humidity environments, the outer surface temperature may be lower than the dew point, requiring thicker insulation or better thermal bridge treatment.

Insulation that gets damp will reduce its effectiveness and may cause internal corrosion. Please refer toHow to judge whether the retained box is suitable before rebuilding the old air-conditioning box? . If the thermal bridges at joints and frames are not treated, local condensation may still occur even if the overall thickness of the panel is sufficient.

Core materials and fire protection requirements must be confirmed separately

Different core materials have different thermal insulation properties, densities, fire protection ratings and moisture behavior. When making an inquiry, the core material type and performance requirements should be stated, not just the thickness. Whether the fire protection information corresponds to materials or finished products needs to be checked, please refer toThe chemical filter has fire protection materials. Is it suitable for on-site use conditions?。

Core material density affects panel strength and weight, as well as transportation and lifting. When the density is insufficient, the panels may deform during use or their insulation performance may decrease.

Installation environment changes thickness requirements

Indoor computer rooms, outdoor open air, roofs and corrosive environments have different requirements for box boards. The outdoor unit needs to be evaluated for rain, sunlight, temperature differences and corrosion, and ordinary indoor conditions cannot be directly applied. Coastal or chemical environments also require consideration of material and coating corrosion resistance.

The installation space and transportation conditions will also affect the box segmentation and panel size. Please refer toHow to choose between combined and integrated air conditioning boxes? andHow to identify the assembly sequence for segmented transportation of combined air-conditioning boxes?。

Write a complete description of the purchasing document

The panel structure, operating pressure range, insulation requirements and surface usage environment can be listed into four items, and then it is clear what kind of test or calculation data to use for confirmation. The outdoor unit also needs to evaluate the rain, sunlight and corrosive environment, and cannot directly copy the material configuration under the conditions of the indoor computer room.

How to list applicable standards in procurement technical documents, please refer toWhat applicable standards should be listed in the technical documents for purchasing air-conditioning boxes? . For the difference between box test and complete machine performance test, please refer toWhat is the difference between the air conditioning box body test and the complete machine performance test?。

Aili industrial supporting equipment

Aili Industrial has sheet metal and complete machine supporting links. Technical communication can be carried out from the plate, frame and connection details, with actual drawings and agreed performance as the basis for confirmation. Aili's industrial manufacturing end covers the independent research and development and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly. The panel structure, frame form and sealing method can be checked in the same package; non-standard boxes can be adjusted according to the transportation size and on-site environment.

Product form can be viewedAir handling unit andFan box page; clean air supply package can be combinedFFU fan filter unit andEFU equipment end fan filter unit verification; terminal particle filtration can be combinedHEPA/ULPA filter confirmation; when it comes to gaseous pollution control, you can communicate separatelyChemical filter solutions. The specific cabinet performance, applicable environment and delivery scope still need to be verified based on the corresponding configuration data and on-site working conditions. Actual results are subject to on-site inspection and performance test results.

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Related questions and answers

The thicker the box board, the better the insulation?
Not quite. The insulation effect also depends on the core material, seams and thermal bridge treatment. Thickness is only one factor and cannot just look at the total thickness.

Are the thickness of the outer steel plate and the thickness of the inner steel plate the same thing?
no. The inner and outer steel plates play different roles, and the structural strength, corrosion resistance and cleaning requirements may correspond to different materials and thicknesses respectively.

Can Aili Industrial help check the box panel configuration?
The panel, frame and sealing scheme can be checked based on the operating conditions, installation environment and structural requirements. The specific configuration needs to be confirmed according to the project conditions.

Related articles

1. What are the differences between double-layer box boards and single-layer box boards used in air-conditioning boxes?

2. Under what pressure conditions should the air leakage rate of air conditioning boxes be compared?

3. How to judge whether the retained box is suitable before rebuilding the old air-conditioning box?

4. What applicable standards should be listed in the technical documents for purchasing air-conditioning boxes?

Key points for selection and acceptance inspection