A review on recent advancements in performance enhancement techniques for low-temperature solar collectors

Gorjian, Shiva; Ebadi, Hossein; Calise, Francesco; Shukla, Ashish; Ingrao, Carlo

doi:10.1016/j.enconman.2020.113246

Cited by 128 publications

(31 citation statements)

References 228 publications

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“…Substituting Eqs. ( 1), ( 4), (5), and ( 6) into (7) and considering the relation between the extinction coefficient and spectral absorbance, the final expression for the spectral absorbance is derived:…”

Section: Model Descriptionmentioning

confidence: 99%

“…The disadvantage of such systems is an overheated outer surface, which loses a significant part of the received energy into the environment. New designs of such devices and different ways to enhance the efficiency of existing technical solutions are proposed [5][6][7][8]. One such solution uses a nanofluid (a stable suspension consisting of a base fluid and nano-sized solid particles dispersed in it) or fine-dispersed suspensions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Particle Size Distribution on the Optical Properties of Fine-Dispersed Suspensions

Kuzmenkov¹,

Struchalin²,

Litvintsova³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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Section: Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Particle Size Distribution on the Optical Properties of Fine-Dispersed Suspensions

Kuzmenkov¹,

Struchalin²,

Litvintsova³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

View full text Add to dashboard Cite

“…The most widely-used solar thermal collectors include flat-plate collectors, evacuated tube collectors, and compound parabolic concentrators (Gorjian et al, 2020a). This section mainly discusses solar collectors made of metal, glass, ceramic, and plastic in the form of plates or tubes.…”

Section: Solar Collector Categoriesmentioning

confidence: 99%

Integration of Active Solar Thermal Technologies in Greenhouses: A Mini Review

Ding

2021

Front. Energy Res.

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Traditional agricultural greenhouses have been used to grow vegetables in the winter without any auxiliary heating. However, crop production is highly influenced by soil and air temperatures, humidity, and solar radiation. The aim of this paper is to review the recent active solar thermal technologies that help reduce the energy demand for greenhouse climate control and achieve intensive crop production. The review is categorized into the following topics: 1) locations for collector installation; 2) discussion on the different types of solar collectors, which include metal-based, glass-based, ceramic-based, plastic-based, and hybrid photovoltaic/thermal types for greenhouse applications; 3) heat release systems in active greenhouses in terms of basal heating, backwall heating, and air heating systems; and 4) short-term and long-term heat storage systems for greenhouses. Future studies on active solar greenhouses might focus on microclimate prediction, long-term heat storage, and system optimization.

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“…In contrast to the base fluid, nanofluids have advantageous optical properties and higher extinction and absorption levels. Optimizing the solar absorption of these fluids is an area of active research 1,2 …”

Section: Introductionmentioning

confidence: 99%

Computational single‐phase comparative study of a Williamson nanofluid in a parabolic trough solar collector via the Keller box method

2021

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Summary A solar thermal collector collects heat by absorbing sunlight and converting this incoming radiation into useful thermal energy. The parabolic trough solar sollector (PTSC) is widely installed in concentrated solar power technology with a temperature range of 325‐700 K. The thermodynamic efficiency of the PTSC can be intensified by using nanofluids owing to their enhanced thermophysical properties. In this paper, the two‐dimensional flow over a stretched sheet in PTSC under Williamson nanofluid effects is explored. With the help of useful transformations, the partial differential equations arising from boundary layer equations of the Williamson nanofluid model are changed into nonlinear ordinary differential equations. The Keller box numerical scheme is then used to find the solution of the resulting nonlinear ordinary differential equations. Two nanofluids, copper‐engine oil (Cu‐EO) and alumina‐engine oil (Al2O3‐EO) are considered to address the performance analysis of PTSC in this study. It is observed that the parameters of the porous media reduced the heat transfer rate but increased the velocity gradient. In order to examine the effect on various performance parameters of the device, the nanoparticle concentration is also varied. With the increase in the Reynolds and Brinkman numbers, the entropy is found to increase. The thermodynamic performance of the Cu‐EO nanofluid is remarkably better than that of the Al2O3‐EO nanofluid under the same conditions. The thermal efficiency of Cu‐EO over Al2O3‐EO is seen with a minimum of 1.5% and a maximum of 9.1%. The theoretical simulations documented here may be effective in improving solar thermal energy systems.

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A review on recent advancements in performance enhancement techniques for low-temperature solar collectors

Cited by 128 publications

References 228 publications

Influence of Particle Size Distribution on the Optical Properties of Fine-Dispersed Suspensions

Influence of Particle Size Distribution on the Optical Properties of Fine-Dispersed Suspensions

Integration of Active Solar Thermal Technologies in Greenhouses: A Mini Review

Computational single‐phase comparative study of a Williamson nanofluid in a parabolic trough solar collector via the Keller box method

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