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Effect of flow maldistrubution on performance of induced and forced draft air-cooled heat exchangers
Thesis (MEng)--Stellenbosch University, 1991.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867614093889765376 |
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| access_status_str | Open Access |
| author | Beiler, Michael Gottfried |
| author2 | Kroger, D. G. |
| author_browse | Beiler, Michael Gottfried Kroger, D. G. |
| author_facet | Kroger, D. G. Beiler, Michael Gottfried |
| author_sort | Beiler, Michael Gottfried |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 1991. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/69246 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:46:33.531Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/69246 Effect of flow maldistrubution on performance of induced and forced draft air-cooled heat exchangers Beiler, Michael Gottfried Kroger, D. G. Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. Fans (Machinery) -- Mathematical models Aerodynamics Heat exchangers -- Cooling Axial flow Thesis (MEng)--Stellenbosch University, 1991. ENGLISH ABSTRACT: Air-cooled heat exchangers of the forced and induced draft type have relative merits. Maldistribution is one of the important aspects that has to be considered when comparing the performance of these exchanger units and selecting the more suitable one for a particular application. This study is confined to air flow maldistribution and thermal maldistribution. An analysis, according to which the thermal performance of a cross-flow air-cooled heat exchanger can be evaluated, is presented. Both the experiment and the analysis reveal that the thermal performance deterioration due to maldistributed flow, as found in practical installations, is small. The axial flow fan used in induced draft is less efficient than in forced draft. Depending on a number of variables, the difference between the fan efficiencies can become greater. Also, the interaction between the fan and adjacent flow obstacles reduces the fan performance. The decline in performance that occurs, when flow resistances are added, is measured. The results are compared to available predictions regarding the deterioration of the fan performance under obstructed flow conditions. AFRIKAANSE OPSOMMING: Geforseerde en geïduseerde trek tipe lugverkoelde warmteuitruilers het onderskeie voordelige eienskappe. Die lugvloeiverdeling deur die warmteuitruiler bundels van die twee stelsels moet in ag geneem word wanneer die vermoë met mekaar vergelyk word om die mees geskikte een vir 'n sekere toepassing te kies. Hierdie studie word beperk tot versteurde lugvloei- en temperatuurverdelings deur die warmteuitruilers. 'n Analise waarmee die vermoë van 'n lugverkoelde warmteuitruiler vir dwarsvloei toestande bepaal kan word, is ingesluit, Beide die eksperimente en die analise toon dat, in praktiese instal lasies, die afname in termiese vermoë as gevolg van versteurde vloeiverdelings klein is. Aksiaalwaaiers wat in lugverkoelde warmteuitruilers gebruik word, is minder effektief in geforseerde trek tipes. Daar gelnduseerde trek tipes as in is 'n aantal faktore wat hierdie versKil in waaiereffektiewiteit kan laat toeneem. Verder Kan die waaiervermoe verlaag wanneer obstruksies die lugvloei deur die waaier belemmer. Hierdie afname word gemeet en die resultate met beskikbare voorspellings vergelyk. Masters 2012-08-27T12:26:59Z 2012-08-27T12:26:59Z 1991-03 Thesis http://hdl.handle.net/10019.1/69246 en_ZA Stellenbosch University 253 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Fans (Machinery) -- Mathematical models Aerodynamics Heat exchangers -- Cooling Axial flow Beiler, Michael Gottfried Effect of flow maldistrubution on performance of induced and forced draft air-cooled heat exchangers |
| title | Effect of flow maldistrubution on performance of induced and forced draft air-cooled heat exchangers |
| title_full | Effect of flow maldistrubution on performance of induced and forced draft air-cooled heat exchangers |
| title_fullStr | Effect of flow maldistrubution on performance of induced and forced draft air-cooled heat exchangers |
| title_full_unstemmed | Effect of flow maldistrubution on performance of induced and forced draft air-cooled heat exchangers |
| title_short | Effect of flow maldistrubution on performance of induced and forced draft air-cooled heat exchangers |
| title_sort | effect of flow maldistrubution on performance of induced and forced draft air cooled heat exchangers |
| topic | Fans (Machinery) -- Mathematical models Aerodynamics Heat exchangers -- Cooling Axial flow |
| url | http://hdl.handle.net/10019.1/69246 |
| work_keys_str_mv | AT beilermichaelgottfried effectofflowmaldistrubutiononperformanceofinducedandforceddraftaircooledheatexchangers |