Thermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storage

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dc.contributor.authorDirker, J.
dc.contributor.authorJuggurnath, D.
dc.contributor.authorKaya, A.
dc.contributor.authorOsowade, E.A.
dc.contributor.authorSimpson, M.
dc.contributor.authorLecompte, S.
dc.contributor.authorNoori Rahim Abadi, S.M.A.
dc.contributor.authorVoulgaropoulos, V.
dc.contributor.authorAdelaja, A.O.
dc.contributor.authorDauhoo, M.Z.
dc.contributor.authorKhoodaruth, A.
dc.contributor.authorObayopo, S.O.
dc.contributor.authorOlakoyejo, O.T.
dc.contributor.authorElahee, M.K.
dc.contributor.authorDe Paepe, M.
dc.contributor.authorMeyer, J.P.
dc.contributor.authorMarkides, C.N.
dc.date.accessioned2022-09-23T11:59:23Z
dc.date.available2022-09-23T11:59:23Z
dc.date.issued2019
dc.descriptionScholarly articleen_US
dc.description.abstractDirect steam generation coupled is a promising solar-energy technology, which can reduce the growing dependency on fossil fuels. It has the potential to impact the power-generation sector as well as industrial sectors where significant quantities of process steam are required. Compared to conventional concentrated solar power systems, which use synthetic oils or molten salts as the heat transfer fluid, direct steam generation offers an opportunity to achieve higher steam temperatures in the Rankine power cycle and to reduce parasitic losses, thereby enabling improved thermal efficiencies. However, its practical implementation is associated with non-trivial challenges, which need to be addressed before such systems can become more economically competitive. Specifically, important thermal-energy processes take place during flow boiling, flow condensation and thermal-energy storage, which are highly complex, multi-scale and multi-physics in nature, and which involve phase-change, unsteady and turbulent multiphase flows in the presence of conjugate heat transfer. This paper reviews our current understanding and ability to predict these processes, and the knowledge that has been gained from experimental and computational efforts in the literature. In addition to conventional steam-Rankine cycles, the possibility of implementing organic Rankine cycle power blocks, which are relevant to lower operating temperature conditions, are also considered. This expands the focus beyond water as the working fluid, to include refrigerants also. In general, significant progress has been achieved in this space, yet there remain challenges in our capability to design and to operate high-performance and low-cost systems effectively and with confidence. Of interest are the flow regimes, heat transfer coefficients and pressure drops that are experienced during the thermal processes present in direct steam generation systems, including those occurring in the solar collectors, evaporators, condensers and relevant energy storage schemes during thermal charging and discharging. A brief overview of some energy storage options are also presented to motivate the inclusion of thermal energy storage into direct steam generation systems.en_US
dc.identifier.citationJ. Dirker, D. Juggurnath, A. Kaya, E.A. Osowade, M. Simpson, S. Lecompte, S. M. A. Noori Rahim Abadi, V. Voulgaropoulos, A. O. Adelaja, M. Z. Dauhoo, A. Khoodaruth, S. O. Obayopo, O. T. Olakoyejo, M. K. Elahee, M. De Paepe, J. P. Meyer and C. N. Markides, (2019). Thermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storage, Frontiers in Energy Research, 6(147), 1-35en_US
dc.identifier.urihttps://ir.unilag.edu.ng/handle/123456789/11536
dc.language.isoenen_US
dc.publisherFrontiersen_US
dc.subjectconcentrated solar poweren_US
dc.subjectdirect steam generationen_US
dc.subjectflow boilingen_US
dc.subjectflow condensationen_US
dc.subjectenergy storageen_US
dc.subjectResearch Subject Categories::TECHNOLOGY::Engineering mechanicsen_US
dc.titleThermal Energy Processes in Direct Steam Generation Solar Systems: Boiling, Condensation and Energy Storageen_US
dc.typeArticleen_US
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