Dust filtration test process of automobile air-conditioning filter

This section specifies several test methods for testing air-conditioning filters to filter dirt (including dust and pollen, etc.) in the air entering the cabin. This section evaluates or compares the performance of the cabin air filter and filter element in the laboratory. The following information of the filter can be given through the test: pressure drop, graded filtration efficiency and ash storage capacity, etc. Normative Reference Documents The clauses in the following documents have become clauses of this part after being quoted in this standard. For dated reference documents, all subsequent amendments (excluding errata content) or revisions do not apply to this section. However, all parties who have reached an agreement based on this section are encouraged to study whether the latest versions of these documents can be used . For undated reference documents, the latest version is applicable to this section. ISO 12103-1:1997 Road vehicles—Dust for filter evaluation—Part 1: Arizona test dust DIN EN 779:2002 Air filters for general ventilation—Determination of filtration performance DIN EN 1822-1:1998 High efficiency air filters (HEPA and ULPA)—Part 1: Classification, performance testing, and labeling. Test conditions 1. Air condition The temperature of the sucked air must be 23°C±2°C, and the relative humidity must be 50%±3%. During the entire experiment of testing the ash storage capacity G of the filter, the above-mentioned temperature and humidity conditions must be maintained. The test conditions are summarized in Table C.2. 2. The air in the clean air suction device must be filtered by a high-efficiency filter of at least H12 level defined in EN 1822-1, and the front stage of the high-efficiency filter must be configured according to EN 779 Defined F7 or F8 level middle-efficiency filter. In view of the air purification requirements and the protection of the test equipment, it is recommended to install a similar device at the exhaust end to capture the dust that penetrates the test sample. 3. Test object ①, test dust Test dust uses A2 ash (fine ash) or A4 ash (coarse ash) defined in ISO 12103-1. Before the test, the test dust should be dried at 105°C±5°C for 4 hours before use. ② Other test dusts For special requirements, other test dusts/aerosols can also be used, such as potassium chloride (KCl), mono- or polydisperse latex balls, plant pollen or other dusts. In this case, the test procedure and test conditions should be negotiated by the filter manufacturer and user. Test equipment 1. Basic structure A structural layout example of the test equipment required to complete the test is shown in Figure A.1 to Figure A.5. The specific dimensions of the main parts are given in Figure A.2. This device, at least from the ashing part to the sampling port on the air outlet, should be made of conductive material and grounded. The basic principle is to minimize the loss of dust particles. The test equipment that meets the specification must meet the requirements of Chapter 5 and Table C.1 and Table C.2. 2. Air supply The air supply needs to be prepared in accordance with 4.1.2. It is required to install a flow adjustment device in the pipeline at the back end of the air suction device, the adjustment range is 150m3/h～680 m3/h. The flow adjustment has nothing to do with the amount of test dust added to the filter, and requires an accuracy of ±2%. It is required to seal the air flow conveying pipe after the flow regulating device. When the pressure difference between the inside and outside of the pipeline reaches 500 Pa, the leaked flow rate should be less than 100 l/min. The size of the airflow guide component can be selected according to the actual situation. 3. Test channel The test channel shall be arranged vertically. Through appropriate measures, such as adding a guide plate, ensure that the air flow is evenly distributed in the transverse section. As shown in Figure A.2. 4. Test the ashing device ①, the ashing device is selected to be the ashing device, so that the test dust selected according to section 4.2 is uniformly supplied. During the test, the ash adding device is required to not change the original particle distribution of the test dust. ② When measuring the grading filtration efficiency with the dilution device of particle distribution density, small particles may stick together and be mistakenly counted as large particles. Therefore, it is equipped with a selection of particles of different sizes as shown in Figure A. A flexible dilution device to reduce the distribution density of dust particles. The device is installed on the dust supply pipe behind the metering equipment, and can replace the dilution equipment in front of the particle counter. When doing ash storage test, the dilution device should be closed.
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