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Inlaatverliese by koeltorings
Thesis (MEng)--Stellenbosch University, 1993.
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| Format: | Thesis |
| Language: | af_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613756783067136 |
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| access_status_str | Open Access |
| author | Terblanche, Jan Ernst |
| author2 | Kruger, D. G. |
| author_browse | Kruger, D. G. Terblanche, Jan Ernst |
| author_facet | Kruger, D. G. Terblanche, Jan Ernst |
| author_sort | Terblanche, Jan Ernst |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 1993. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/58014 |
| institution | Stellenbosch University (South Africa) |
| language | af_ZA |
| last_indexed | 2026-06-10T12:41:12.661Z |
| 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:10019.1/58014 Inlaatverliese by koeltorings Terblanche, Jan Ernst Kruger, D. G. Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. Cooling towers Cooling towers -- Design and construction Dissertations -- Mechanical engineering Inlets Thesis (MEng)--Stellenbosch University, 1993. ENGLISH ABSTRACT: The purpose of this thesis is to determine the parameters which have an influence on the inlet losses to both dry and wet cooling towers. Empirical correlations that describe these losses are derived according to experimental, analytical and numerical work. Practical ways to reduce these losses are also investigated. It is found that the inlet loss in cylindrical dry cooling towers is dependant on the inlet height to inlet diameter ratio of the cooling mwer as well as the heat exchanger pressure loss coefficient. In rectangular cooling towers the inlet loss is dependent on the inlet height to inlet width ratio of the cooling tower as well as the heat exchanger pressure loss coefficient. The heat exchanger arrangement is an important parameter when predicting the inlet loss. The necessity of taking the kinetic energy coefficient of the velocity profile into consideration when calculating the inlet losses is confirmed. The pressure loss in the rainzone of a wet cooling tower is found to be dependent on seven dimensionless groups. The important parameters in these groups are the geometry of the tower, the mean drop diamete,, the mean air velocity through the tower and the mean water velocity through the rainzone. Other factors of imponaoce are the air and water densities, the surface tension of water and the gravitational acceleration. It is found that when determining the drag coefficient cf the water drop in air the effects of drop distortion and acceleration effects have to be taken into account. Correlations which describe the pressure loss in the rainzone are found. AFRIKAANSE OPSOMMING: Die doel van hierdie tesis is om die parameters wat die inlaatverliese van droe en nat koeltorings beinvloed te identifiseer en te kwantifiseer. EMpirirese koreelasies wat hierdie verliese beskryf is afgelei na aanleiding van eksperimentele, analitiese en numeriese werk. Praktiese metodes om hierdie verliese te minimeer word ook ondersoek. Daar is gevind dat die inlaatverliese by silindriese droe koeltorings afhanklik is van die inlaathoogte tot inlaatdiameter verhouding en die warmte-uitruilerdrukverlieskoeffisient. By reghoekige droe koeltorings is die inlaatverlies afhanklik van die inlaathoogte tot inlaatwydte verhouding en die warmte-uitruilerdrukverlieskoeffisient. Die rangskikking van die warmteuitruilers is in al die koeltorings van kardinale belang. Die noodsaaklikheid om die kinetiese energiekoeffisient van die snelheidsprofiel in ag te neem in die bepaling van die inlaatverliese word bewys. In die ondersoek na die drukverlies oor die reensone van 'n nat koeltoring, word bewys dat die verlies deur sewe dimensielose groepe beinvloed word. Die belangrikste parameters in die groepe is die geometrie van die toring, die gemiddelde druppeldiameter, die gemiddelde lugsnelheid deur die toring en die gemiddelde watersnelheid deur die reensone. Ander faktore van belang is die lug- en waterdigthede, die oppervlakspanning van water en die gravitasiekonstante. Daar word gevind dat druppelvervorming en versnellingseffekte op die sleurkragkoeffisient van die vallende druppels van belang is in die bepaling van die verliese. Korrelasie wat die drukverlies oor die reensone beskryf is bepaal. Masters 2012-08-27T11:38:46Z 2012-08-27T11:38:46Z 1993 Thesis http://hdl.handle.net/10019.1/58014 af_ZA Stellenbosch University 246 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Cooling towers Cooling towers -- Design and construction Dissertations -- Mechanical engineering Inlets Terblanche, Jan Ernst Inlaatverliese by koeltorings |
| title | Inlaatverliese by koeltorings |
| title_full | Inlaatverliese by koeltorings |
| title_fullStr | Inlaatverliese by koeltorings |
| title_full_unstemmed | Inlaatverliese by koeltorings |
| title_short | Inlaatverliese by koeltorings |
| title_sort | inlaatverliese by koeltorings |
| topic | Cooling towers Cooling towers -- Design and construction Dissertations -- Mechanical engineering Inlets |
| url | http://hdl.handle.net/10019.1/58014 |
| work_keys_str_mv | AT terblanchejanernst inlaatverliesebykoeltorings |