Evaluation of different discharging methods on HVAC electret filter media
Electret filters with electrostatic charges added on fibers are widely used in HVAC system of residential and commercial buildings to mitigate PM2.5 exposure in indoor environments. Filtration applications require the knowledge of minimum filtration efficiency of electret filters under worst conditi...
Gespeichert in:
| Veröffentlicht in: | Building and environment 2018-08, Vol.141, p.206-214 |
|---|---|
| Hauptverfasser: | , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 214 |
|---|---|
| container_issue | |
| container_start_page | 206 |
| container_title | Building and environment |
| container_volume | 141 |
| creator | Tang, Min Thompson, Drew Chen, Sheng-Chieh Liang, Yun Pui, David Y.H. |
| description | Electret filters with electrostatic charges added on fibers are widely used in HVAC system of residential and commercial buildings to mitigate PM2.5 exposure in indoor environments. Filtration applications require the knowledge of minimum filtration efficiency of electret filters under worst condition. To determine the minimum efficiency, different electret discharging methods are used in test standards to eliminate electrostatic effects. This study evaluated the isopropanol (IPA) liquid discharging method in EN 779 and the IPA saturated vapor treatment in ISO 16890. It was found that although both IPA liquid immersion and saturated vapor treatment can significantly remove fiber charge, saturated vapor treatment showed better discharging performance. The charge density of media discharged by IPA liquid immersion and saturated vapor treatment were 2 μC/m2 and 0 μC/m2, respectively. It demonstrated that IPA saturated vapor treatment can completely remove fiber charge, while undesirable fiber charge occurred after being treated by IPA liquid due to interface electrification. The test results of unsaturated vapor treatment indicated that IPA in the phase of vapor was not capable of removing fiber charges. The fact that saturated vapor treatment was more effective than liquid immersion was due to the different discharging process. For saturated vapor treatment, vapor condensed on fiber surface and formed a liquid layer with thickness of 15 nm. This ultra-thin layer of IPA liquid can discharge the fiber charge completely without inducing extra charge after liquid evaporation. This study concluded that discharging method in ISO 16890 should be used in electret filter test.
•Saturated IPA vapor treatment showed better discharging performance than liquid.•Undesirable fiber charge occurred after being treated by IPA liquid.•Condensed IPA vapor formed an ultra-thin layer to remove fiber charge completely.•Discharging method in ISO 16890 should be used in electret filter test. |
| doi_str_mv | 10.1016/j.buildenv.2018.05.048 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_journals_2099049442</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0360132318303147</els_id><sourcerecordid>2099049442</sourcerecordid><originalsourceid>FETCH-LOGICAL-c491t-7446f2c36f34bc457e73034cd2f3a4fc68a56d9f6e1e84a2beee5b2fc3e013f53</originalsourceid><addsrcrecordid>eNqFkF9LwzAUxYMoOKdfQQo-t-Zf0_bNMaYbDHxR8S2k6c2W0rUzSQd-ezOqzz7dC_ecczk_hO4Jzggm4rHN6tF2DfSnjGJSZjjPMC8v0IyUBUtFyT8v0QwzgVPCKLtGN963OBorxmdoszqpblTBDn0ymKSxxoCDPsTN671yO9vvkgOE_dD4JGrWH4tlAh3o4CAkxnYBXLw3Vt2iK6M6D3e_c47en1dvy3W6fX3ZLBfbVPOKhLTgXBiqmTCM15rnBRQMM64bapjiRotS5aKpjAACJVe0BoC8pkYzwISZnM3Rw5R7dMPXCD7IdhhdH19KiqsK84pzGlViUmk3eO_AyKOzB-W-JcHyjE228g-bPGOTOJcRWzQ-TUaIHU4WnPTaQq9jRRdby2aw_0X8AOaLeiE</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2099049442</pqid></control><display><type>article</type><title>Evaluation of different discharging methods on HVAC electret filter media</title><source>Elsevier ScienceDirect Journals Complete</source><creator>Tang, Min ; Thompson, Drew ; Chen, Sheng-Chieh ; Liang, Yun ; Pui, David Y.H.</creator><creatorcontrib>Tang, Min ; Thompson, Drew ; Chen, Sheng-Chieh ; Liang, Yun ; Pui, David Y.H.</creatorcontrib><description>Electret filters with electrostatic charges added on fibers are widely used in HVAC system of residential and commercial buildings to mitigate PM2.5 exposure in indoor environments. Filtration applications require the knowledge of minimum filtration efficiency of electret filters under worst condition. To determine the minimum efficiency, different electret discharging methods are used in test standards to eliminate electrostatic effects. This study evaluated the isopropanol (IPA) liquid discharging method in EN 779 and the IPA saturated vapor treatment in ISO 16890. It was found that although both IPA liquid immersion and saturated vapor treatment can significantly remove fiber charge, saturated vapor treatment showed better discharging performance. The charge density of media discharged by IPA liquid immersion and saturated vapor treatment were 2 μC/m2 and 0 μC/m2, respectively. It demonstrated that IPA saturated vapor treatment can completely remove fiber charge, while undesirable fiber charge occurred after being treated by IPA liquid due to interface electrification. The test results of unsaturated vapor treatment indicated that IPA in the phase of vapor was not capable of removing fiber charges. The fact that saturated vapor treatment was more effective than liquid immersion was due to the different discharging process. For saturated vapor treatment, vapor condensed on fiber surface and formed a liquid layer with thickness of 15 nm. This ultra-thin layer of IPA liquid can discharge the fiber charge completely without inducing extra charge after liquid evaporation. This study concluded that discharging method in ISO 16890 should be used in electret filter test.
•Saturated IPA vapor treatment showed better discharging performance than liquid.•Undesirable fiber charge occurred after being treated by IPA liquid.•Condensed IPA vapor formed an ultra-thin layer to remove fiber charge completely.•Discharging method in ISO 16890 should be used in electret filter test.</description><identifier>ISSN: 0360-1323</identifier><identifier>EISSN: 1873-684X</identifier><identifier>DOI: 10.1016/j.buildenv.2018.05.048</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Charge density ; Commercial buildings ; Commercial real estate ; Discharge ; Discharging ; Electret filter ; Electrification ; Electrostatic discharges ; Evaporation ; Filter media ; Filters ; Filtration ; HVAC ; HVAC equipment ; Immersion ; Indoor environments ; Isopropanol ; Particle ; Particulate matter ; Residential buildings ; Residential density ; Submerging ; Thickness ; Vapors</subject><ispartof>Building and environment, 2018-08, Vol.141, p.206-214</ispartof><rights>2018 Elsevier Ltd</rights><rights>Copyright Elsevier BV Aug 15, 2018</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c491t-7446f2c36f34bc457e73034cd2f3a4fc68a56d9f6e1e84a2beee5b2fc3e013f53</citedby><cites>FETCH-LOGICAL-c491t-7446f2c36f34bc457e73034cd2f3a4fc68a56d9f6e1e84a2beee5b2fc3e013f53</cites><orcidid>0000-0003-4011-3619 ; 0000-0002-1612-2673</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.buildenv.2018.05.048$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Tang, Min</creatorcontrib><creatorcontrib>Thompson, Drew</creatorcontrib><creatorcontrib>Chen, Sheng-Chieh</creatorcontrib><creatorcontrib>Liang, Yun</creatorcontrib><creatorcontrib>Pui, David Y.H.</creatorcontrib><title>Evaluation of different discharging methods on HVAC electret filter media</title><title>Building and environment</title><description>Electret filters with electrostatic charges added on fibers are widely used in HVAC system of residential and commercial buildings to mitigate PM2.5 exposure in indoor environments. Filtration applications require the knowledge of minimum filtration efficiency of electret filters under worst condition. To determine the minimum efficiency, different electret discharging methods are used in test standards to eliminate electrostatic effects. This study evaluated the isopropanol (IPA) liquid discharging method in EN 779 and the IPA saturated vapor treatment in ISO 16890. It was found that although both IPA liquid immersion and saturated vapor treatment can significantly remove fiber charge, saturated vapor treatment showed better discharging performance. The charge density of media discharged by IPA liquid immersion and saturated vapor treatment were 2 μC/m2 and 0 μC/m2, respectively. It demonstrated that IPA saturated vapor treatment can completely remove fiber charge, while undesirable fiber charge occurred after being treated by IPA liquid due to interface electrification. The test results of unsaturated vapor treatment indicated that IPA in the phase of vapor was not capable of removing fiber charges. The fact that saturated vapor treatment was more effective than liquid immersion was due to the different discharging process. For saturated vapor treatment, vapor condensed on fiber surface and formed a liquid layer with thickness of 15 nm. This ultra-thin layer of IPA liquid can discharge the fiber charge completely without inducing extra charge after liquid evaporation. This study concluded that discharging method in ISO 16890 should be used in electret filter test.
•Saturated IPA vapor treatment showed better discharging performance than liquid.•Undesirable fiber charge occurred after being treated by IPA liquid.•Condensed IPA vapor formed an ultra-thin layer to remove fiber charge completely.•Discharging method in ISO 16890 should be used in electret filter test.</description><subject>Charge density</subject><subject>Commercial buildings</subject><subject>Commercial real estate</subject><subject>Discharge</subject><subject>Discharging</subject><subject>Electret filter</subject><subject>Electrification</subject><subject>Electrostatic discharges</subject><subject>Evaporation</subject><subject>Filter media</subject><subject>Filters</subject><subject>Filtration</subject><subject>HVAC</subject><subject>HVAC equipment</subject><subject>Immersion</subject><subject>Indoor environments</subject><subject>Isopropanol</subject><subject>Particle</subject><subject>Particulate matter</subject><subject>Residential buildings</subject><subject>Residential density</subject><subject>Submerging</subject><subject>Thickness</subject><subject>Vapors</subject><issn>0360-1323</issn><issn>1873-684X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqFkF9LwzAUxYMoOKdfQQo-t-Zf0_bNMaYbDHxR8S2k6c2W0rUzSQd-ezOqzz7dC_ecczk_hO4Jzggm4rHN6tF2DfSnjGJSZjjPMC8v0IyUBUtFyT8v0QwzgVPCKLtGN963OBorxmdoszqpblTBDn0ymKSxxoCDPsTN671yO9vvkgOE_dD4JGrWH4tlAh3o4CAkxnYBXLw3Vt2iK6M6D3e_c47en1dvy3W6fX3ZLBfbVPOKhLTgXBiqmTCM15rnBRQMM64bapjiRotS5aKpjAACJVe0BoC8pkYzwISZnM3Rw5R7dMPXCD7IdhhdH19KiqsK84pzGlViUmk3eO_AyKOzB-W-JcHyjE228g-bPGOTOJcRWzQ-TUaIHU4WnPTaQq9jRRdby2aw_0X8AOaLeiE</recordid><startdate>20180815</startdate><enddate>20180815</enddate><creator>Tang, Min</creator><creator>Thompson, Drew</creator><creator>Chen, Sheng-Chieh</creator><creator>Liang, Yun</creator><creator>Pui, David Y.H.</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>8FD</scope><scope>C1K</scope><scope>F28</scope><scope>FR3</scope><scope>KR7</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0003-4011-3619</orcidid><orcidid>https://orcid.org/0000-0002-1612-2673</orcidid></search><sort><creationdate>20180815</creationdate><title>Evaluation of different discharging methods on HVAC electret filter media</title><author>Tang, Min ; Thompson, Drew ; Chen, Sheng-Chieh ; Liang, Yun ; Pui, David Y.H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c491t-7446f2c36f34bc457e73034cd2f3a4fc68a56d9f6e1e84a2beee5b2fc3e013f53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Charge density</topic><topic>Commercial buildings</topic><topic>Commercial real estate</topic><topic>Discharge</topic><topic>Discharging</topic><topic>Electret filter</topic><topic>Electrification</topic><topic>Electrostatic discharges</topic><topic>Evaporation</topic><topic>Filter media</topic><topic>Filters</topic><topic>Filtration</topic><topic>HVAC</topic><topic>HVAC equipment</topic><topic>Immersion</topic><topic>Indoor environments</topic><topic>Isopropanol</topic><topic>Particle</topic><topic>Particulate matter</topic><topic>Residential buildings</topic><topic>Residential density</topic><topic>Submerging</topic><topic>Thickness</topic><topic>Vapors</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tang, Min</creatorcontrib><creatorcontrib>Thompson, Drew</creatorcontrib><creatorcontrib>Chen, Sheng-Chieh</creatorcontrib><creatorcontrib>Liang, Yun</creatorcontrib><creatorcontrib>Pui, David Y.H.</creatorcontrib><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Environment Abstracts</collection><jtitle>Building and environment</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tang, Min</au><au>Thompson, Drew</au><au>Chen, Sheng-Chieh</au><au>Liang, Yun</au><au>Pui, David Y.H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evaluation of different discharging methods on HVAC electret filter media</atitle><jtitle>Building and environment</jtitle><date>2018-08-15</date><risdate>2018</risdate><volume>141</volume><spage>206</spage><epage>214</epage><pages>206-214</pages><issn>0360-1323</issn><eissn>1873-684X</eissn><abstract>Electret filters with electrostatic charges added on fibers are widely used in HVAC system of residential and commercial buildings to mitigate PM2.5 exposure in indoor environments. Filtration applications require the knowledge of minimum filtration efficiency of electret filters under worst condition. To determine the minimum efficiency, different electret discharging methods are used in test standards to eliminate electrostatic effects. This study evaluated the isopropanol (IPA) liquid discharging method in EN 779 and the IPA saturated vapor treatment in ISO 16890. It was found that although both IPA liquid immersion and saturated vapor treatment can significantly remove fiber charge, saturated vapor treatment showed better discharging performance. The charge density of media discharged by IPA liquid immersion and saturated vapor treatment were 2 μC/m2 and 0 μC/m2, respectively. It demonstrated that IPA saturated vapor treatment can completely remove fiber charge, while undesirable fiber charge occurred after being treated by IPA liquid due to interface electrification. The test results of unsaturated vapor treatment indicated that IPA in the phase of vapor was not capable of removing fiber charges. The fact that saturated vapor treatment was more effective than liquid immersion was due to the different discharging process. For saturated vapor treatment, vapor condensed on fiber surface and formed a liquid layer with thickness of 15 nm. This ultra-thin layer of IPA liquid can discharge the fiber charge completely without inducing extra charge after liquid evaporation. This study concluded that discharging method in ISO 16890 should be used in electret filter test.
•Saturated IPA vapor treatment showed better discharging performance than liquid.•Undesirable fiber charge occurred after being treated by IPA liquid.•Condensed IPA vapor formed an ultra-thin layer to remove fiber charge completely.•Discharging method in ISO 16890 should be used in electret filter test.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.buildenv.2018.05.048</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0003-4011-3619</orcidid><orcidid>https://orcid.org/0000-0002-1612-2673</orcidid><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0360-1323 |
| ispartof | Building and environment, 2018-08, Vol.141, p.206-214 |
| issn | 0360-1323 1873-684X |
| language | eng |
| recordid | cdi_proquest_journals_2099049442 |
| source | Elsevier ScienceDirect Journals Complete |
| subjects | Charge density Commercial buildings Commercial real estate Discharge Discharging Electret filter Electrification Electrostatic discharges Evaporation Filter media Filters Filtration HVAC HVAC equipment Immersion Indoor environments Isopropanol Particle Particulate matter Residential buildings Residential density Submerging Thickness Vapors |
| title | Evaluation of different discharging methods on HVAC electret filter media |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-05T06%3A32%3A04IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Evaluation%20of%20different%20discharging%20methods%20on%20HVAC%20electret%20filter%20media&rft.jtitle=Building%20and%20environment&rft.au=Tang,%20Min&rft.date=2018-08-15&rft.volume=141&rft.spage=206&rft.epage=214&rft.pages=206-214&rft.issn=0360-1323&rft.eissn=1873-684X&rft_id=info:doi/10.1016/j.buildenv.2018.05.048&rft_dat=%3Cproquest_cross%3E2099049442%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2099049442&rft_id=info:pmid/&rft_els_id=S0360132318303147&rfr_iscdi=true |