Number of views: 8754 Author: AILI Industrial Release time: 2027-02-09 Source: Ai Li Industrial
The air leakage rate of air conditioning boxes is suitable for comparison only when the test pressure, positive and negative pressure directions, prototype range, area or air volume standards and methods are consistent. A percentage without indicating conditions cannot explain the sealing performance of the unit under actual working conditions, nor can it be directly compared with the air leakage volume given by the box area.
Different tests may use different pressures and normalized benchmarks, and the test object may also be a single-section box or a complete machine including access doors and connecting seams. The technical confirmation should write down the positive pressure or negative pressure, measuring points, holding conditions, allowable values and calculation methods. Results obtained by testing only at low pressure cannot be extrapolated to guaranteed values at higher pressures.
The pressure conditions should be written in the test pressure difference, direction and corresponding operating interval; the object boundary should be written in the whole machine or a single section, and whether it includes doors, joints and accessories; the result caliber should be written in the air leakage unit, normalization benchmark and method used. Only when these three conditions are complete can the air leakage rate figures be meaningful. Please refer to the difference between static pressure, total pressure and static pressure outside the air conditioner box.What is the difference between static pressure, total pressure and static pressure outside the air conditioner box?。
During the positive pressure test, the air in the box leaks out; during the negative pressure test, the outside air is sucked into the box. The air leakage mechanisms in the two directions are similar, but the requirements for sealing structures and detection methods are different. Positive pressure air leakage is easier to observe with a smoke or anemometer, while negative pressure air leakage requires attention to the impact of external air inhalation on internal cleanliness and gas control.
For the difference in drainage between positive pressure section and negative pressure section, please refer toWhat is the difference between the positive pressure section drainage and the negative pressure section drainage of the air conditioning box? . For prevention and control of external air leakage in the negative pressure section, please refer toHow to prevent external air leakage when a chemical filter is installed in the negative pressure section?。
For units transported in sections, the test results of a single section cannot directly represent the air tightness of the entire unit after on-site connection. Joints, flange gaskets, and field openings can all become new air leakage points. The technical document should indicate whether the test object is a single section before leaving the factory, a complete machine before leaving the factory, or a complete machine after on-site installation, and who will perform the sealing inspection after on-site connection.
For the identification and assembly of segmented transportation of combined air-conditioning boxes, please refer toHow to identify the assembly sequence for segmented transportation of combined air-conditioning boxes? . For protection of air vents and pipe joints before transportation, please refer toHow should the air vents and pipe joints of air-conditioning boxes be protected before leaving the factory for transportation?。
Air leakage rates may be normalized by cabinet surface area, rated air volume, or other basis. The air leakage volume calculated by area and the air leakage rate calculated by air volume percentage have different numerical meanings and cannot be compared directly. When comparing, you should confirm that the two data use the same basis, or convert them to the same caliber before comparing.
The box size and panel structure will affect the air leakage performance, please refer toWhat indicators should be used to determine the thickness of air conditioning box panels? . For 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?。
For units transported in sections, it should be stated who will perform the sealing inspection after on-site connection; after drilling or modification, the impact on the sealing also needs to be evaluated. The acceptance document retains the test conditions and original records, which is easier to trace than writing a separate air leakage grade. Which standard and version to adopt should be specified in the project technical documents.
What applicable standards should be listed in the 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? . For condition checks before starting the machine for the first time, please refer toWhat conditions need to be checked before the air conditioner is turned on for the first time?。
When confirming the sealing requirements with Aili Industrial, the operating pressure and delivery method can be provided together, so that the box, access door and on-site connection conditions can be checked according to the same boundary. 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 box structure, door frame sealing and on-site connection seams can be checked in the same package; the sealing scheme for non-standard sections can be adjusted according to transportation and installation conditions.
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 air leakage indicators, test conditions 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 sealing inspection and performance test results.
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What is the air leakage rate? Can it be directly compared with other manufacturers?
uncertain. It depends on whether the test pressure, positive and negative pressure directions, test objects and normalized benchmarks are consistent. Different conditions cannot be compared directly.
If a single section passes the test, does the entire machine pass on site?
uncertain. On-site connection seams, flanges and openings may increase air leakage, and the air tightness of the entire machine needs to be confirmed separately after on-site connection.
Can Aili Industrial help confirm the air leakage test conditions?
The test boundary and sealing plan can be checked based on the operating pressure and delivery method. The specific conditions need to be confirmed according to the project technical documents.
Check items |
Confirm key points |
Check items |
Confirm key points |
|---|---|---|---|
stress conditions |
Test pressure difference, direction and operating range |
object bounds |
Complete machine or single section, whether including doors and joints |
Result caliber |
Air leakage units and normalization standards |
Live connection |
Responsibility for joint seal inspection |
Standard version |
Standards and versions adopted |
original record |
Test conditions and data traceable |
