A numerical analysis for the dynamic performance of a multi-purpose solar thermal system for residential applications

dc.contributor.authorCoetzee, R.A.M.en
dc.contributor.authorMwesigye, A.en
dc.contributor.authorHuan, Z.en
dc.date.accessioned2017-09-19T12:48:31Z
dc.date.available2017-09-19T12:48:31Z
dc.date.issued2017en
dc.descriptionPapers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .en
dc.description.abstractThis paper presents results of a multi-purpose solar thermal system that provides hot service water, space heating and space cooling for residential use during all seasons in Pretoria, South Africa. A pressurized system using evacuated tube solar collectors with internal heat pipes to provide the required hot water and a micro single-effect LiBr -H2O absorption chiller to provide the required space heating and cooling was considered. For the solar field, collectors consisting of 25-tubes (3.266 m2 each) are connected in parallel in a 3, 4 and 5 array field. In this study, the focus was on determining the hourly performance trends of the considered system using typical meteorological year weather conditions. The performance of the system was obtained by developing the system’s mathematical model whose solution was obtained using Engineering Equation Solver (EES). The model was validated using available experimental data and good agreement was obtained. The absorption chiller model was validated using data from ASHRAE and was shown to be valid within ±2.2%. From the analysis, results show that the 25-tube collector with a 5 array field could operate without interruption throughout the seasons, yielding tank temperatures at 111.75°C and 95.18 °C for the summer and winter seasons, respectively. However, the recommended system, with the lowest scalding hazard risk, is that of the 25-tube collectors with a 4 array field. This system produced a cooling capacity of 5.94-7.3 kW at a cooling coefficient of performance (COP) of 0.78-0.8 in winter and 4.24-5.94 kW at a cooling COP of 0.77-0.73 in summer.en
dc.description.sponsorshipInternational centre for heat and mass transfer.en
dc.description.sponsorshipAmerican society of thermal and fluids engineers.en
dc.format.extent7 pagesen
dc.format.mediumPDFen
dc.identifier.urihttp://hdl.handle.net/2263/62376
dc.language.isoenen
dc.publisherHEFATen
dc.rightsUniversity of Pretoriaen
dc.subjectMultipurpose solar thermal systemen
dc.subjectResidential applicationsen
dc.titleA numerical analysis for the dynamic performance of a multi-purpose solar thermal system for residential applicationsen
dc.typePresentationen

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