1、 WORLDWIDE ENGINEERING STANDARDS General Specification GMW14787 HVAC Hybrid Filter, Particle and Odor Copyright 2011 General Motors Company All Rights Reserved December 2011 Originating Department: North American Engineering Standards Page 1 of 11 1 Introduction Note: Nothing in this standard superc
2、edes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Scope. For all vehicle interior hybrid filters. The requirements indicated in this specification are coordinated for flowed through filter a
3、reas 5 dm2. Filter areas of 3 95 95 95 Condition: New Any After Aging Loading: unloaded/+50 Pa +200 Pa unloaded/+50 Pa 165 110 55 0 0 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from I
4、HS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14787 Copyright 2011 General Motors Company All Rights Reserved December 2011 Page 5 of 11 Table 3: Limiting Curves of Fractional Collection Rates for Small Particles Particle Diameter Mobility Diameter in m Limiting Curve F1 in % Limiting Curve F2 in % L
5、imiting Curve F3 in % 0.05 55 55 35 0.1 45 45 25 0.2 to 0.3 30 40 20 Condition: New Any After Aging Loading: unloaded/+50 Pa +200 Pa unloaded/+50 Pa 4.3.1 Immediate Break-Through. The immediate break-through is defined as the percentage rate of the concentrations before and after the filter, immedia
6、tely 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 1st measured value may be 20 seconds (maximum). Dead times caused by
7、 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 with DIN 71460-2 under the following test conditions: Volume
8、tric flow: 50 L/s Relative humidity (RH): (50 3)% Temperature: (+23 3) C 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. Table 4: Immediate Break-Through Limit Va
9、lues Test Gas Immediate Break-Through n-Butane 12% maximum toluene 10% maximum SO2 10% maximum NOx 9% maximum NO2 5% maximum 4.3.2 Storage Capacity (Adsorption Capacity). The storage capacity refers to the maximum quantity of the test gas in grams which can be adsorbed by a filter element. Determina
10、tion in accordance with DIN 71460-2. Calculate from concentrations subject to the following test conditions: Volumetric flow: 50 L/s Relative humidity: (50 3)% Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permit
11、ted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14787 Copyright 2011 General Motors Company All Rights Reserved December 2011 Page 6 of 11 Temperature: (+23 2) C Application concentration, n-Butane or toluene: (80 2) ppm Application concentration SO2: (30 3) ppm Application co
12、ncentration 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 Test Gas Storage Capacity g/Filter Element n-Butane 4 toluene 28 SO2 5 within 60 minutes NOx 4 within 60 minutes NO2 7 within 60 minutes 4.3.
13、3 Break-Through Behavior. Without prejudice to the requirements regarding immediate break-through (paragraph 4.3.1) and the requirements regarding storage capacity (paragraph 4.3.2), the efficiency described below shall be proved over the test period in the first 15 minutes of the test. Determinatio
14、n similar to DIN 71460-2 under the following test conditions: Volumetric flow: 50 L/s Relative humidity: (50 3)% Temperature: (23 3) C Application concentration, n-Butane or toluene: (80 2) ppm Application concentration SO2: (30 2) ppm Application concentration NOx and NO2: (30 3) ppm 4.3.3.1 Requir
15、ements. The break-through graph determined for the respective test gas may not exceed the values in Table 6. Table 6: Maximum Permissible Limit Values for the Break-Through Graphs in the First 15 Minutes Test Gas Break-Through in % After 300 seconds After 600 seconds After 900 seconds n-Butane 50 80
16、 90% toluene 16% 25% 30% SO2 32% 45% 50% NOx 27% 35% 43% NO2 7% 11% 15% Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14787 Copyright 2
17、011 General Motors Company All Rights Reserved December 2011 Page 7 of 11 Figure 2: Maximum Permissible Limit Values for the Break-Through Graphs in the First 15 Minutes 4.4 Aging Test. To evaluate the reduction in the effectiveness of the filter caused by temperature and humidity, the filters are s
18、ubjected to the aging test below. The filters shall pass through the test cycle described in paragraph 4.4.1 three times. See Table 7. After completion, the filters are deemed to be “aged“ within the meaning of this specification. After the aging test, the filters shall pass the tests according to A
19、ppendix A and fulfill the described requirements. 4.4.1 Aging Test (Dry-Humid-Wet-Frost). See Table 8. 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 3) C. Prevent st
20、orage of the filter for several days at (23 3) C in a thawed-wet condition (after the end of the third test 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 aging test, care shall be tak
21、en that the filter is not accidentally loaded with dust. Table 9 shows the pattern and the possible starting times for a complete cycle. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license fro
22、m IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14787 Copyright 2011 General Motors Company All Rights Reserved December 2011 Page 8 of 11 Table 7: Aging Cycle Part Cycle Test Conditioning Duration Intermediate Storage at (23 3) C 1 Temperature-Humidity-Storage At (100 3) C, 25% RH 20 hours 4 hours
23、2 Temperature-Humidity-Storage At (60 3) C, 98% RH 20 hours 4 hours 3a Moistening The filter is wetted with 600 mL distilled water using a suitable atomizer. After an exposure time of 2 hours, any water remaining on the filter is poured off. 2 hours 3b Freezing The filter is frozen in the wet condit
24、ion at (-30 3) C. After a frost time of 18 hours, the filter is thawed for 4 hours at (23 3) C and stored. 18 hours 4 hours 4 Drying The thawed filter is dried in an oven with circulating air at (50 3) C 20 hours 4 hours Table 8: Aging Test for Vehicle Interior Filters and Combi-filters Aging Cycle
25、1st Day 2nd Day 3rd Day 4th Day Note 1 20 hours 4 hours 20 hours 4 hours 2 hours 18 hours 4 hours 20 hours 4 hours 24 hours Storage at (100 3) C and 25% RH X Storage at (60 3) C and 98% RH X Moisten with 600 mL distilled water X Dry in circulating air at (+50 3) C X Storage at (-30 3) C X (23 3) C X
26、 X X X X Note 1: Compensation days inserted (e.g., weekends) Table 9: Examples of Starting Times Note 1 Starting time 12:00 12:00 08:00 12:00 08:00 12:00 14:00 08:00 12:00 08:00 12:00 Starting time 14:00 14:00 10:00 14:00 10:00 14:00 16:00 10:00 14:00 10:00 14:00 Note 1: If the starting time on the
27、first day is between 12:00 and 14:00, all the change-over times will be in the period between 08:00 and 16:00. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENG
28、INEERING STANDARDS GMW14787 Copyright 2011 General Motors Company All Rights Reserved December 2011 Page 9 of 11 4.5 Sealing of the Filter in its Housing. The sealing effect of the filter in its housing frame depends on the two sealing elements (filter and housing). The test can, therefore, only be
29、undertaken in connection with original housings or a suitable test stand. The test can also be carried out within the scope of tests on samples which are being tested according to GMW14323. However, it is absolutely essential to comply with the modified limit values for combi-filters. 4.5.1 The test
30、 of the sealing takes place in the steps described below. 4.5.1.1 The filter to be tested is installed in an original housing under production conditions. The housing is to be tested for its dimensional accuracy according to drawing before the test. As an alternative the test can also be performed o
31、n a test stand if it can be proved that the dimensional accuracy, the static/dynamic behavior and the installation of the filter element corresponds to the original installation. 4.5.1.2 The pressure loss is determined on this assembly (analogous to paragraph 4.2). The pressure loss values DP27.5 th
32、ru DP165 (in Pascals) relating to the volumetric flow 27.5 L/s to 165 L/s are determined. 4.5.1.3 The filter medium shall be sealed by suitable means without increasing the mechanical rigidity of the filter element and affecting the external dimensions. Preferably an air-impermeable tape shall be us
33、ed. 4.5.1.4 Now the leaking air, which is present because of leaks in the filter installation, is determined as a function of the ram pressure in front of the filter. The pressure loss values DP27.5 to DP165 in Pa determined in item 4.5.1.2 should be used as the pressure values. The measurement of t
34、he leaking air can take place in a test stand according to DIN 71460-1 if the volumetric flow regulation is sufficiently accurate and has a high resolution or in a different, suitable test setup. 4.5.1.5 The leaking air rates determined in item 4.5.1.4 may not exceed the limit values in Table 10. Th
35、e definition of the limit values assumes that the maximum leaking air, which occurs because of the installation of the filter in the housing, does not exceed 1.0% of the normal volumetric flow in as-new condition. Table 10: Maximum Permissible Leaking Air Rates Volumetric Flow in L/s Pressure Loss i
36、n Pa Maximum Permissible Leaking Air in L/s 27.5 DP27.5 0.3 55 DP55 0.6 82.5 DP82.5 0.9 110 DP110 1.1 137.5 DP137.5 1.4 165 DP165 1.7 4.6 Vibration Test. The filter may not release filter own particles under the influence of the vibration load occurring in the vehicle either in as-delivered conditio
37、n or after a long period of use. The filters are subjected to the vibration tests below to test this characteristic. 4.6.1 Continuous Vibration Test. The continuous vibration test takes place according to GMW3172. The filter is only to be exposed to vibration load without simultaneous airflow. 4.6.2
38、 Characteristics of Separation of Particles. 4.6.2.1 Test Preparation. The filter to be tested shall be covered in the discharge side with a white dust fleece (e.g., smooth F6 medium) over the entire filter surface. The filter shall then be flown through with airflow of 195 L/s for 15 minutes. 4.6.2
39、.2 Vibration Load to Measure the Separation Characteristics. Frequency: 10 Hz to 200 Hz Acceleration: 5G in each direction of the compartment Test Time: 30 minutes Excitation Direction: Parallel to filter level (housing) Copyright General Motors Company Provided by IHS under license with General Mot
40、ors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14787 Copyright 2011 General Motors Company All Rights Reserved December 2011 Page 10 of 11 4.6.2.3 Requirement. After the test, neither in state of rest nor after the
41、vibrational load according to paragraph 4.6.2.2, residual fine dust shall be detectable visually. Increase of weight shall be 0.01 g (maximum). 5 Provisions for Shipping Not applicable. 6 Notes 6.1 Glossary. Aged: The filter has been subjected to the aging test described in paragraph 4.4. As-new Con
42、dition/New: The filter has not been exposed to any aging tests (corresponds to the suppliers as-received condition). FIATEC GmbH: A specialized laboratory for air filter performance testing. Loaded/Gas: The filter has been loaded with the test gases and has reached its final capacity. Unloaded/Gas:
43、The filter has not been in contact with test gases. If there is corresponding proof of their effectiveness, it is also possible to use filters tested with n-Butane and sufficiently desorbed for further tests as unloaded/gas. 6.2 Acronyms, Abbreviations, and Symbols. NO2 Nitrous Oxide NOx Oxides of N
44、itrogen RH Relative Humidity SO2 Sulfur Dioxide 7 Additional Paragraphs 7.1 All parts or systems supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 8 Coding System This standard shall be referenced in other documents, drawings, etc
45、., as follows: GMW14787 9 Release and Revisions This standard was originated in November 2005. It was first approved by the HVAC Module Global Subsystem Leadership Team in March 2006. It was first published in March 2006. Issue Publication Date Description (Organization) 1 MAR 2006 Initial publicati
46、on. 2 DEC 2011 Update content for 5 Year Refresh. (HVAC Module GSSLT) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14787 Copyright 201
47、1 General Motors Company All Rights Reserved December 2011 Page 11 of 11 Appendix A Table A1: Test Sequence Paragraph Test Filter Number 1 2 3 4 5 6 7 8 9 10 11 12 4.6.2 Particle Separation/As New Condition X 4.2 Pressure Loss Measurements X X X X X X X X X 4.4 Aging X X X 4.2 Pressure Loss Measurem
48、ents X X X 4.6.2 Particle Separation after Aging X 4.6.1 Continuous Vibration Test X 4.6.2 Particle Separation after Continuous Test X 4.3.1 Immediate Break-Through n-Butane X X X 4.3.3 Break-Through Behavior n-Butane X X X 4.3.2 Storage Capacity n-Butane X X X 4.3.1 Immediate Break-Through Toluene X X X 4.3.3 Efficiency Over Time Toluene X X 4.3.2 Storage Capacity Toluene Immediate Break-Through SO2 X X 4.3.3 Break-Through Behavior SO2 X X 4.3.2 Storage Capa
