A critical evaluation and refinement of the performance prediction of wet-cooling towers

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dc.contributor.advisorKroger, D. G.
dc.contributor.authorKloppers, Johannes Christiaanen_ZA
dc.contributor.otherUniversity of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering.
dc.date.accessioned2008-07-21T09:46:33Zen_ZA
dc.date.accessioned2010-06-01T08:22:39Z
dc.date.available2008-07-21T09:46:33Zen_ZA
dc.date.available2010-06-01T08:22:39Z
dc.date.issued2003-12
dc.descriptionThesis (PhD (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2003.
dc.description.abstractThe thermal performance prediction of wet-cooling towers is critically analyzed and refined. Natural draft counterflow towers and mechanical draft counterflow and crossflow towers are considered. The Merkel, Poppe and e-NTU heat and mass transfer methods of analysis are derived from first principles, as these methods form the cornerstone of wet-cooling tower performance evaluation. The critical differences between these methods, when applied to fill performance analyses and cooling tower performance evaluations, are highlighted. The reasons for these differences are discussed with the aid of psychrometric charts. A new extended empirical relation for the loss coefficient of fills is proposed where the viscous and form drag effects are accounted for as well as the buoyancy, momentum and fill height effects. The empirical equation for the transfer characteristic of fills is extended to include the effects of fill height and the inlet water temperature. Empirical equations to predict the temperature inversion profile, height of the temperature inversion and the height from which air is drawn into the cooling tower are developed. The influence of temperature and humidity inversions on the performance of wet-cooling towers is subsequently investigated. A comprehensive analytical computer program is developed to predict and optimize the performance of wet-cooling towers. Computer programs are also developed to generate cooling tower performance curves, analyze fill performance test data and plot psychrometric charts.en_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/1476
dc.language.isoenen_ZA
dc.publisherStellenbosch : University of Stellenbosch
dc.rights.holderUniversity of Stellenbosch
dc.subjectWet-cooling toweren_ZA
dc.subjectMerkelen_ZA
dc.subjectPoppeen_ZA
dc.subjecte-NTUen_ZA
dc.subjectNatural draften_ZA
dc.subjectMechanical draften_ZA
dc.subjectFillen_ZA
dc.subjectTemperature inversionen_ZA
dc.subjectCooling towers
dc.subjectDissertations -- Mechanical engineering
dc.subjectTheses -- Mechanical engineering
dc.subject.otherMechanical and Mechatronic Engineeringen_ZA
dc.titleA critical evaluation and refinement of the performance prediction of wet-cooling towersen_ZA
dc.typeThesisen_ZA
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