Vacuum boiling of water in a steam jet refrigeration system

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dc.contributor.authorMitchley, Stephen Ronald
dc.date.accessioned2014-05-30T12:21:33Z
dc.date.available2014-05-30T12:21:33Z
dc.date.issued2014-05-30
dc.description.abstractThis experim ental project aims to describe the influencing factors in the vacuum boiling o f w ater in w ater vapour refrigeration system s Testing was conducted using a 2 kW three-stage steam je t ejector system, w ith barom etric condensers, as the com pression device. Three direct-contact evaporators were used to investigate the boiling phenom ena. T hese were : a through-flow evaporator w here heal and mass transfer rates were established for boiling m echanism s at various positions within the evaporator; a vertical cylinder where small quantities o f w ater were subjected to rapid decom pression and the effects m easured, and a sim ple channel for photographic studies o f the process. Boiling in direct-contact water vapour systems is described herein The vacuum boiling proo ss was found to be controlled by a com bination o f the w ater surface tem perature and the hydrostatic pressure gradient, these being governed by the w ater vapour flow geometry between the w ater surface and ejector suction and convective heat transfer below the boiling region. The contributions o f the various boiling regim es to the total heat transfer are discussed. Heat and mass transfer coefficients and their applicability to evaporator design are presenteden_ZA
dc.identifier.urihttp://hdl.handle.net10539/14725
dc.language.isoenen_ZA
dc.subject.lcshEjector pumps
dc.subject.lcshSteam--Thermal properties
dc.subject.lcshRefrigeration and refrigerating machinery
dc.subject.lcshThermodynamics
dc.titleVacuum boiling of water in a steam jet refrigeration systemen_ZA
dc.typeThesisen_ZA
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