Test process of dust filtration test of automobile air conditioner filter

This section specifies a number of test methods for testing air conditioner filters for filtration of contaminants (including dust and pollen, etc.) entering the cabin air. This section is used to evaluate or compare the performance of cabin air filters and filter elements in the laboratory. Through the test, the following information of the filter can be given: pressure drop, classification filtration efficiency and ash storage capacity. Normative references The following documents contain provisions which, through reference in this standard, become provisions of this part. For dated references, all subsequent amendments (excluding errata content) or revisions do not apply to this section, however, parties to agreements based on this section are encouraged to study whether the latest versions of these documents can be used . For undated references, the latest edition applies 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: Grading, performance testing, marking. Test conditions 1. The temperature of the air inhaled in the air condition must be 23°C±2°C, 50% relative humidity±3%. The above temperature and humidity conditions must be maintained throughout the experiment for testing the ash storage G of the filter. A summary of the test conditions is shown in Table C.2. 2. The air in the air cleaning device must be filtered by a high-efficiency filter of at least H12 level defined by EN 1822-1, and the pre-stage of the high-efficiency filter must be configured according to EN 779 Defined medium filter at F7 or F8 level. Due to air purification requirements and protection of the test equipment, it is recommended that a similar device be installed on the exhaust side to capture dust penetrating the test specimen. 3. Test object ①, test dust The test dust uses A2 ash (fine ash) or A4 ash (coarse ash) as defined in ISO 12103-1. Before the test, the test dust should be at 105°C±5°It was used after drying for 4h under the condition of C. 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 shall be agreed between the filter manufacturer and the user. Test equipment 1. Basic structure An example of the structural arrangement of the test equipment required to complete the test is shown in Figures A.1 to A.5. The specific dimensions of the main parts are given in Figure A.2. This device, at least from the dusting part to the sampling port on the air outlet side, should be 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 Air supply should be prepared according to 4.1.2. It is required to install a flow adjustment device in the pipeline at the rear end of the airflow suction device, and the adjustment range is 150m3/h～680m3/h. The flow regulation is independent of the amount of test dust added to the filter and is required to be accurate to±2%. Requires seals from the airflow delivery ducts after the flow conditioning device. When the pressure difference inside and outside the pipeline reaches 500 Pa, the leaked flow rate should be less than 100 l/min. The size of the airflow guide components can be selected according to the actual situation. 3. Test channel The test channel is required to be arranged vertically. By suitable measures, such as adding guide plates, ensure that the airflow is evenly distributed across the transverse section. As shown in Figure A.2. 4. Test ash-adding device ①. The ash-adding device should be selected as an ash-adding device, so that the test dust selected according to Section 4.2 can be supplied evenly. During the test, it is required that the ash adding device will not change the original particle distribution of the test dust. ②. When the particle distribution density dilution device measures the classification and filtration efficiency, it may be mistakenly counted as large particles due to the possibility of small particles sticking together. A special dilution device is used to reduce the distribution density of dust particles. The device is installed on the dust supply pipe after the metering equipment, and can replace the dilution equipment before the particle counter. During the ash storage test, the dilution device should be closed. 5. The dust in the ash test should be introduced in the opposite direction of the airflow as shown in Figure A.2. It must be ensured that the test ash is evenly distributed in the test channel. The test channel must be of conductive material, and the intake air must be dry and free of oil. Once significant sampling errors have been ruled out through the tests of 5.6 to 5.9, the suitability of the test system can be verified, given that the test dust is uniform in the three-dimensional space. 6. Sampling tube The sampling tube is installed facing the air flow direction. Sampling tubes can be installed upstream and downstream of the test sample respectively; or only one sampling tube can be installed at the downstream position of the sample, respectively, to measure the two cases with and without the test sample installed. When sampling, the airflow velocity in the sampling tube is required to be as consistent as possible with the airflow around the sampling tube (isokinetic sampling). The deviation should be controlled at±within 20%. If a sampling tube is used in the upstream and downstream of the test sample, the two sampling tubes are required to be of the same specification and model, especially the requirements in Section 5.9.
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