A thermo-economic comparison of the up-therm heat converter and an organic rankine cycle heat engine

dc.contributor.authorKirmse, C.J.W.en
dc.contributor.authorOyewunmi, O.A.en
dc.contributor.authorHaslam, A.J.en
dc.contributor.authorMarkides, C.N.en
dc.date.accessioned2017-08-28T07:07:42Z
dc.date.available2017-08-28T07:07:42Z
dc.date.issued2016en
dc.descriptionPapers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.en
dc.description.abstractIn this paper we compare a recently proposed two-phase thermofluidic oscillator device termed ‘Up-THERM’ to a basic (sub-critical, non-regenerative) equivalent organic Rankine cycle (ORC) engine. In the Up-THERM heat converter, a constant temperature difference imposed by an external heat source and sink leads to periodic evaporation and condensation of the working fluid, which gives rise to sustained oscillations of pressure and volumetric displacement. These oscillations are converted in a load arrangement into a unidirectional flow, which passes through a hydraulic motor that extracts useful work from the device. A pre-specified Up-THERM design is being considered in a selected application with two n-alkanes, n-hexane and n-heptane, as potential working fluids. One aim of this work is to evaluate the potential of this proposed design. The thermodynamic comparison shows that the ORC engine outperforms the Up-THERM heat converter in terms of power output and thermal efficiency, as expected. An economic comparison, however, reveals that the capital costs of the Up-THERM are lower than those of the ORC engine. Nevertheless, the specific costs (per unit power) favour the ORC engine due to its higher power output. Some aspects of the proposed Up-THERM design are identified for improvement.en
dc.format.extent6 pagesen
dc.format.mediumPDFen
dc.identifier.urihttp://hdl.handle.net/2263/61895
dc.language.isoenen
dc.publisherHEFATen
dc.rightsUniversity of Pretoriaen
dc.subjectThermo-economicen
dc.subjectUp-therm heat converteren
dc.subjectOrganic rankine cycle heat engineen
dc.titleA thermo-economic comparison of the up-therm heat converter and an organic rankine cycle heat engineen
dc.typePresentationen

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