Direct absorption nanofluid-based solar collectors for low and medium temperatures. A review

Mañas, Miguel Sainz; Bataille, Françoise; Caliot, Cyril; Vossier, Alexis; Flamant, Gilles

doi:10.1016/j.energy.2022.124916

Cited by 24 publications

(6 citation statements)

References 185 publications

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“…The strongest zeitgebers are dawn and dusk signals, which do not need intense light, but rather a pattern of daily variation with sunrise and sunset. They are dependent on the season and latitude [77]. Compared to static lighting, dynamic lighting simulating a natural sunrise through a change in colour temperature from 1090 K to 2750 K and illuminance at the eye (0-250 lx) resulted in improved subjective mood and well-being, enhanced cognitive performance, and demonstrated that it could be a potential cardiac vulnerability protector during the critical morning hours [78].…”

Section: Solar Daylightingmentioning

confidence: 99%

Enhancing Occupants’ Thermal Comfort in Buildings by Applying Solar-Powered Techniques

et al. 2023

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As most people spend their days indoors, it is indeed important that buildings provide residents with a higher standard of health, convenience, and safety. As a result, many practices are implemented into buildings to improve the comfort of occupants, particularly thermal comfort; nevertheless, the energy required to run and maintain these applications is a significant constraint. Renewable energy sources offer alternative solutions to energy demand problems, and selecting the best renewable energy sources is crucial. In this article, we examine the health and well-being advantages to the occupants, as well as the surrounding environment, of a variety of novel strategies that may be integrated into buildings to increase occupants’ thermal comfort for conventional practices using solar power. The key discoveries explored in this article include daylighting, passive ventilation, thermal applications, cooling applications, and power generation. For this, the information was gathered by a systematic review of the relevant prior literature. In addition, the detrimental effects of existing practices on the health and well-being of residents and the environment are included. While there are still some practical obstacles to overcome in the extraction of solar energy, the technology exists. Potential future obstacles to the broad acceptance and usage of solar energy systems in buildings are highlighted, as well as possible solutions.

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Section: Solar Daylightingmentioning

confidence: 99%

Enhancing Occupants’ Thermal Comfort in Buildings by Applying Solar-Powered Techniques

et al. 2023

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“…Since Tyagi et al 9 used aluminum nanofluid to evaluate the performance of the DASC, different nanofluids based on carbon‐based, metallic, metal oxide, and so forth, nanoparticles were selected and used as the working fluid of the DASC 10 . A review paper was done by Sainz‐Mañas et al 11 based on the application of the nanofluids in the DASCs in low‐ and medium‐temperature. In addition, Moghaieb et al 12 reviewed the recent development of the nanofluid‐based DASCs.…”

Section: Introductionmentioning

confidence: 99%

CFD modeling of a triple‐walled direct absorption evacuated tube solar collector based on hybrid nanofluid/microencapsulated PCM

Shahini,

Karami,

Akhavan‐Behabadi

2024

Energy Science & Engineering

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Nowadays, direct absorption solar collectors are a new concept of solar collectors which have attracted special attention. The type of heat transfer fluid (HTF) has a significant influence on the efficiency of this kind of collector. Therefore, in this study, a wide range of working fluids including mono nanofluid ( and CuO), binary nanofluid, and especially the incorporation of a new hybrid combination of nanofluid and microencapsulated phase change material (MPCM), are used as the working fluids of a triple‐walled direct absorption evacuated tube solar collector. The computational fluid dynamics (CFD) method is used for simulating the collector and investigating the effect of different parameters including volume fraction, base fluid, mass flow rate, and type of absorber tube structure (double‐ and triple‐walled) on collector thermal performance. Results show that binary nanofluids of 0.06% /0.002% CuO/water and 0.06% /0.002% CuO/ethylene glycol (EG) have the largest working fluid temperature differentials equal to 48.31 and 66.5 K, respectively. It was inferred that, at the mass flow rate of 2.7 , the efficiency is obtained to be 60.29% employing binary/EG nanofluid, which is 8.68% and 15.31% higher than CuO/EG and /EG nanofluids, respectively. Inserting the hybrid CuO nanofluid/MPCM leads to an improvement of 1.14% and 1.22% in the efficiency of triple‐ and double‐walled collectors, respectively, with respect to the individual usage of the nanofluid. The thermal efficiency of the double‐walled structure is higher than triple‐walled considering all HTFs.

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“…In order to improve the efficiency of a solar thermal collector, researchers proposed a concept of directly absorbing the solar energy within the fluid volume in the 1970s called Direct Absorption Solar Collector (DASC) [9]. In a DASC, the HTF absorbs incident radiation volumetrically, as a result of which more homogeneous temperature distribution and reduced heat losses are experienced than in the conventional surface collectors (Figure 4) [10]. However, the efficiency of direct absorption collector is limited by the absorption properties of the conventional working fluid, which is very poor over the range of the wavelength in the solar spectrum [11].…”

Section: Introductionmentioning

confidence: 99%

Direct Absorption Solar Collector: An Experimental Investigation of Al2O3-H2O Nanofluid over the Flat Plate at Different Tilt Angles, and Mass-Flow Rates

Jyani,

Sharma,

Chaudhary

et al. 2024

New Energy Exploit. Appl.

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The escalating demand for solar thermal energy, coupled with the current inefficiencies in existing systems, underscores the critical need for innovative advancements in thermal storage solar collectors. The efficiency of solar collectors relies not solely on design effectiveness but also on the thermophysical properties, such as heat capacity and thermal conductivity, inherent in the working fluid. This study investigates a novel solar collector with a gross area of 0.36 m2, operating on the principle of direct absorption. Experimental investigations were done at various tilt angles (15°, 20°, and 30°) with respect to the horizontal, considering different flow rates and nanofluid settlement within the base fluids. The use of Al2O3 nanoparticles into the base fluid as water, exhibits significant positive effects on the thermophysical properties of the nanofluids, with a volume concentration of 0.003%. The efficiency of the solar collector was calculated across three mass flow rates (0.5, 1, and 1.33 L/min) at each tilt angle. Notably, the study reveals that the efficiency peaks at a 15° tilt due to an optimal flow configuration for maximum energy harvest across all three mass flow rates. Increasing the mass flow rate yields efficiency increments for all tilt angles (15°, 20°, and 30°), with 1 L/min emerging as the optimal mass-flow rate in most cases. This research not only addresses the immediate need for improved solar thermal technologies but also aligns with global sustainability goals, contributing to the IEA Net Zero Emissions initiative and supporting UN Sustainable Development Goals 7, 9, and 11. The paper also includes a critical literature review on the use of nanofluids in solar thermal collectors to improve thermo-physical properties and enhance solar efficiency. Additionally, the key findings regarding the influence and tilt angle on solar efficiency are discussed.

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Direct absorption nanofluid-based solar collectors for low and medium temperatures. A review

Cited by 24 publications

References 185 publications

Enhancing Occupants’ Thermal Comfort in Buildings by Applying Solar-Powered Techniques

Enhancing Occupants’ Thermal Comfort in Buildings by Applying Solar-Powered Techniques

CFD modeling of a triple‐walled direct absorption evacuated tube solar collector based on hybrid nanofluid/microencapsulated PCM

Direct Absorption Solar Collector: An Experimental Investigation of Al2O3-H2O Nanofluid over the Flat Plate at Different Tilt Angles, and Mass-Flow Rates

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