GMW-14787-2006.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS General Specification HVAC and Powertrain Cooling GMW14787 HVAC Hybrid Filter, Particle and Odor Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Originating Department: North American Engineering Standards Page 1 of 10 1 Introduction The requ
2、irements indicated in this specification are coordinated for flowed through filter areas 5 dm2. Filter areas of 3 95 95 95 Condition: New any after ageing Loading: unloaded/+50 Pa +200 Pa unloaded/+50 Pa Table 3: Limiting Curves of Fractional Collection Rates for Small Particles Particle diameter mo
3、bility diameter in m Limiting curve F1 in % Limiting curve F2 in % Limiting curve F3 in % 0.05 55 55 35 0.1 45 45 25 0.20.3 30 40 20 Condition: New any after ageing Loading: unloaded/+50 Pa +200 Pa unloaded/+50 Pa 4.3.1 Immediate Break-Through. The immediate break-through is defined as the percentag
4、e rate of the concentrations before and after the filter, immediately after the commencement of loading the filter with the test gas. The immediate break- though is calculated from the first measured values after beginning of the application of gas. The time between the application of gas and the 1s
5、t measured value may be 20 s maximum. Dead times caused by the test stand between the application of gas and arrival of the gas before the filter shall be proved by measurement in the individual case and taken into account mathematically in the evaluation if necessary. Determination in accordance wi
6、th DIN 71460-2 under the following test conditions: Volumetric flow: 50 L/s Relative humidity: 50 3% Temperature: +23 3C Application concentration, n-butane or toluene: 80 2 ppm Application concentration SO2: 30 2 ppm Application concentration NOx and NO2: 30 3 ppm 4.3.1.1 Requirements. See Table 4.
7、 -,-,- GM WORLDWIDE ENGINEERING STANDARDS GMW14787 Copyright 2006 General Motors Corporation All Rights Reserved March 2006 Page 5 of 10 Table 4: Immediate Break-Through Limit Values Test Gas Immediate Break-Through n-Butan 12% max Toluol 10% max SO2 10% max NOx 9% max NO2 5% max 4.3.2 Storage Capac
8、ity (Adsorption Capacity). The storage capacity refers to the maximum quantity of the test gas in g which can be adsorbed by a filter element. Determination in accordance with DIN 71460-2. Calculate from concentrations subject to the following test conditions: Volumetric flow: 50 L/s Relative humidi
9、ty: 50 3% Temperature: +23 2C Application concentration, n-butane or toluene: 80 2 ppm Application concentration SO2: 30 3 ppm Application concentration NOx and NO2: 30 3 ppm Criterion for stopping: Break-through 95% 4.3.2.1 Requirements. See Table 5. Table 5: Minimum Storage Capacity Requirement Te
10、st Gas Storage Capacity, g/Filter element n-Butan 4 Toluol 28 SO2 5 within 60 min NOx 4 within 60 min NO2 7 within 60 min 4.3.3 Break-Through Behavior. Without prejudice to the requirements regarding immediate break- through (paragraph 4.3.1) and the requirements regarding storage capacity (paragrap
11、h 4.3.2), the efficiency described below shall be proved over the test period in the first 15 min of the test. Determination similar to DIN 71460-2 under the following test conditions: Volumetric flow: 50 L/s Relative humidity: 50 3% Temperature: 23 3C Application concentration, n-butane or toluene:
12、 80 2 ppm Application concentration SO2: 30 2 ppm Application concentration NOx and NO2: 30 3 ppm 4.3.3.1 Requirements. The break-through graph determined for the respective test gas may not exceed the values in Table 6. GMW14787 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2006 General Motors Corpo
13、ration All Rights Reserved Page 6 of 10 March 2006 Table 6: Maximum Permissible Limit Values for the Break-Through Graphs in the first 15 min Break-Through in % Test Gas after 300 s after 600 s after 900 s n-Butan 50 80 90% Toluol 16% 25% 30% SO2 32% 45% 50% NOx 27% 35% 43% NO2 7% 11% 15% Figure 2:
14、Maximum Permissible Limit Values for the Break-Through Graphs in the first 15 min 4.4 Ageing Test. To evaluate the reduction in the effectiveness of the filter caused by temperature and humidity, the filters are subjected to the ageing test below. The filters shall pass through the test cycle descri
15、bed in paragraph 4.4.1 three times. After completion the filters are deemed to be “aged“ within the meaning of this specification. After the ageing test, the filters shall pass the tests according to Appendix A and fulfill the described requirements. 4.4.1 Ageing Test (Dry-Humid-Wet-Frost). See Tabl
16、e 7. The test points 1, 2, 3 a/b and 4 are each performed on one day. Work-free days falling within the test period (e.g., weekends or holidays) are to be filled in with storage at 23 3C. Prevent storage of the filter for several days at 23 3C in a thawed-wet condition (after the end of the third te
17、st day) in order not to falsify the results. In a normal 5 day week, Monday or Tuesday is therefore the best day for beginning of the test cycle. During the entire ageing test, care shall be taken that the filter is not accidentally loaded with dust. GM WORLDWIDE ENGINEERING STANDARDS GMW14787 Copyr
18、ight 2006 General Motors Corporation All Rights Reserved March 2006 Page 7 of 10 Table 8 shows the pattern and the possible starting times for a complete cycle. Table 7: Ageing Cycle Part Cycle Test Conditioning Duration Intermediate Storage at +23 3 C 1 Temperature-humidity-storage At 100 3C, 25% r
19、elative humidity 20 h 4 h 2 Temperature-humidity-storage At 60 3C, 98% relative humidity 20 h 4 h 3a Moistening The filter is wetted with 600 ml distilled water using a suitable atomizer. After an exposure time of 2 h any water remaining on the filter is poured off. 2 h 3b Freezing The filter is fro
20、zen in the wet condition at -30 3C. After a frost time of 18 h, the filter is thawed for 4 h at 23 3C and stored 18 h 4 h 4 Drying The thawed filter is dried in an oven with circulating air at 50 3C 20 h 4 h Table 8: Ageing Test for Vehicle Interior Filters and Combi-filters 1st Day 2nd Day 3rd Day
21、4th Day Note 1 Ageing Cycle 20 h 4 h 20 h 4 h2 h 18 h 4 h 20 h 4 h 24 h Storage at +100 3C and 25% RH X Storage at +60 3C and 98% RH X Moisten with 600 ml distilled water X Dry in circulating air at +50 3C X Storage at -30 3C X +23 3C X X X X X Note 1: Compensation days inserted (e.g., weekends) Tab
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