What is the difference between air conditioning box body test and complete machine performance test?

The air conditioning box body test mainly evaluates the sealing, strength or thermal characteristics of the corresponding structure and boundary, while the overall machine performance test focuses on agreed results such as air volume, pressure, and hot and cold treatment. The two types of evidence objects are different. The box test results cannot automatically prove the cooling capacity of the whole machine, and the fan sample cannot replace the whole machine test.

Read first subjects and coverage

The report should describe the prototype structure, size range, operating or applied conditions and usage. Whether the data of a certain representative box covers this unit needs to be checked for applicable boundaries; for complete machine testing, the functional sections, air volume, and cold and heat source conditions need to be confirmed. It is easy to overlook the actual testing part by just looking at the product name on the cover of the report.

The cabinet evidence should write down the object structure, pressure or temperature difference conditions and applicable scope; the whole machine evidence should write down the configuration, working conditions, measurement items and results; the component evidence should write down the specific component performance and its relationship with the whole machine results. The three types of evidence correspond to different objects and cannot be substituted for each other. Under what pressure conditions should the air leakage rate of air conditioning boxes be compared? Please refer toUnder what pressure conditions should the air leakage rate of air conditioning boxes be compared?。

The box test evaluates the structural characteristics

Enclosure testing typically focuses on structural properties such as enclosure sealing, strength, insulation, or thermal bridging. The air leakage test measures the amount of air leakage under an agreed pressure difference, the strength test checks the deformation of the box under pressure, and the thermal test evaluates the insulation performance. These tests answer 'how the box structure performs under agreed conditions', rather than 'whether the whole machine can achieve the designed air volume and cooling capacity.'

How to determine the thickness and structure of the box board, 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? . The box test report should indicate the prototype structure and applicable size range.

The overall machine performance test evaluates the operating results.

The complete machine performance test measures operating results such as air volume, pressure, cooling heat, input power, etc. under agreed working conditions. What it answers is 'Can this configured unit achieve the agreed performance under specified conditions?' The whole machine test requires actual functional sections, fans, coils and cold and heat source conditions, and cannot be extrapolated from box tests or component samples.

How the fan performance affects the overall machine results, please refer toWhy should we check the efficiency range when selecting air-conditioning box fans? . How the pressure caliber affects the test results, please refer toWhat is the difference between static pressure, total pressure and static pressure outside the air conditioner box? . How to select the type of surface cooler according to the air inlet and outlet conditions, please refer toHow to select the type of air conditioner cooler according to the air inlet and outlet conditions?。

Component samples cannot replace complete machine testing

Fan samples, coil calculations, and filter test reports are all component-level evidence. They can help understand overall machine performance, but they do not automatically prove how the complete machine will actually perform under installed conditions. Box resistance, airflow distribution, fan installation and interface sealing will all cause the overall machine results to deviate from the component sample values.

How the functional segment sequence and internal resistance affect the entire machine can be referred toOn what basis should the sequence of functional sections of the air conditioning box be determined? andWhat functional segments should be included in the internal resistance of the air conditioning box? . How to establish the pressure budget of the whole machine, please refer toHow is the total pressure of the air conditioning box fan determined by the internal resistance and external demand?。

How to make reasonable evidence requirements in a contract

Correspond each result that requires acceptance to an appropriate evidence, and clarify the differences between sample data, factory inspection and special testing. If third-party witnessing or on-site testing is required, the plan and cost should be confirmed in advance. Projects that have not been carried out cannot be written as passed, and the certification mark cannot be extended to products or configurations that are not covered.

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? . How to unify the evidence requirements for inquiry forms, please refer toHow to write an inquiry form for air conditioning boxes so that different quotes can be compared? . Verification boundaries for pharmaceutical projects, please refer toHow to define the boundaries of equipment and verification work in the air-conditioning box of pharmaceutical clean workshop?。

On-site acceptance belongs to the third type of evidence

On-site acceptance is carried out on the actual system after installation, involving actual operating results such as air volume balance, pressure difference, temperature, humidity, and cleanliness. It is different from both the box test and the factory complete machine test. Site conditions, air duct installation and terminal distribution will all affect the results, and the factory test data cannot be directly regarded as on-site acceptance conclusions.

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? . How to change the debugging sequence from stand-alone to system linkage, please refer toHow to change the debugging sequence of air conditioning box from stand-alone unit to system linkage? . The on-site acceptance record should be able to correspond to the equipment number and test conditions.

Aili industrial supporting equipment

When checking the technical information with Aili Industrial, the test objects and applicable scope can be confirmed one by one, so that the report can be matched with the actual procurement configuration. 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, complete machine configuration and component data can be corresponded in the same set of technical documents; non-standard configurations can indicate the test coverage and the parts that require supplementary verification.

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 test scope, evidence requirements and delivery materials still need to be confirmed based on the project contract, applicable standards and on-site conditions.

Submit project parameters:https://ailigy.com/contactus.html

Related questions and answers

If the box test passes, can it prove that the air volume and cooling capacity of the whole machine meet the standards?
cannot. The box test evaluates the structural characteristics, and the air volume and cooling capacity of the whole machine require corresponding performance data or tests of the whole machine.

Can fan sample data replace the complete machine performance test?
cannot. Fan samples are component-level evidence, and overall machine results are also affected by box resistance, airflow distribution, and installation conditions.

What test data can Aili Industry provide?
Information related to the cabinet, components and complete machine can be provided according to the agreed scope. The specific test scope needs to be confirmed based on the project technical documents and product configuration.

Related articles

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

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

3. What is the difference between static pressure, total pressure and static pressure outside the air conditioner box?

4. How to change the debugging sequence of air conditioning box from stand-alone unit to system linkage?

Key points for selection and acceptance inspection