Thermal and fluid dynamic analysis of Direct Steam Generation Parabolic Trough Collectors

Ferchichi, Souha; Kessentini, Hamdi; Morales-Ruiz, S.; Rigola, Joaquim; Bouden, Chiheb; Oliva, A.

doi:10.1016/j.enconman.2019.05.107

Cited by 20 publications

(1 citation statement)

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“…Owing to variations in cloud coverage, ambient conditions and diurnal irradiance, there will be variations in the flow as well as unsteadiness in the heat transfer (and steam generation rate) in the solar field [17,18]. While research has been dedicated to understanding DSG collectors under steady-state operation [19,20], the operation of these plants under unsteady conditions remains relatively unexplored, with a lack of knowledge on performance during transient operation.…”

Section: Introduction and Project Motivationmentioning

confidence: 99%

RS–DFID Africa capacity-building initiative programme grant: harnessing unsteady phase-change heat exchange in high-performance concentrated solar power systems

Winchester,

Maghrabi,

Markides

2024

Interface Focus.

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The Royal Society and UK Department for International Development supported a consortium of three universities across sub-Saharan Africa and Imperial College London with the aim of developing new knowledge on direct-steam-generation concentrated solar power (CSP) plants and supporting relevant capacity building across the Universities of Lagos, Mauritius and Pretoria. Key research findings from the programme include an improved flow-classification scheme for two-phase, liquid–liquid flows; testing of advanced surfaces with much-improved steady-state heat transfer performance—the commercial nanoFLUX surface showed up to 200% higher heat-transfer coefficients (HTCs) in pool boiling compared with other surfaces with R-134a/R-245fa; first-of-a-kind measurements of transient flow boiling HTCs, which were up to 30% lower in step perturbations than quasi-steady-state expectations in horizontal pipes with R-245fa; error estimation and corrections for laser-induced fluorescence (LIF) measurements, leading to the development of an adapted planar LIF technique with uncertainty <10% for local, instantaneous film thickness measurements in annular flows, and the application of such diagnostic methods to pool, falling-film and flow boiling in pipes; and predictions of an ~80% increase in the net present value of a case-study CSP plant when integrated with solid storage media.

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