scholarly journals Highly efficient energy harvest via external rotating magnetic field for oil based nanofluid direct absorption solar collector

2020 ◽  
Author(s):  
Debing Wang ◽  
Wenwen Liang ◽  
Zhiheng Zheng ◽  
Peiyu Jia ◽  
Yunrui Yan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Collector ◽  
Rotating Magnetic Field ◽  
Energy Harvest ◽  
Direct Absorption ◽  
Efficient Energy ◽  
Highly Efficient ◽  
Direct Absorption Solar Collector

Experimental Investigation on Solar Thermal Properties of Magnetic Nanofluids for Direct Absorption Solar Collector

2016 ◽  
Author(s):  
Qinbo He ◽  
Geni Yan ◽  
Shuangfeng Wang
Keyword(s):  
Magnetic Field ◽  
Thermal Properties ◽  
Field Intensity ◽  
Solar Collector ◽  
Magnetic Field Intensity ◽  
Solar Collectors ◽  
Direct Absorption ◽  
Solar Absorption ◽  
Magnetic Nanofluids ◽  
Direct Absorption Solar Collector

Nanofluids are found to have good optical and thermal properties as direct sunlight absorbers in solar collectors. In this article, Co-H2O nanofluids were prepared through two-step method. The photothermal properties of nanofluids were investigated under different magnetic field intensity. The effect of Co-H2O nanofluids on the efficiency of a direct absorption solar collector was also investigated experimentally. The experimental results show that the applied magnetic field can enhance the solar absorption ability of Co-H2O nanofluids, and has an optimal magnetic field intensity 30Gs. The highest temperature of Co-H2O nanofluid (0.04wt%, 30Gs) is increased up to 39.5% compared with deionized water. The maximum efficiency of direct absorption solar collector with Co-H2O nanofluid under 30Gs magnetic field (0.1wt%, 30nm) is increased up to 51.70% and 13.24% compared with water and Co-H2O nanofluid without magnetic field, respectively. The results indicate that the magnetic field has the potential to effectively improve the solar absorption capabilities of direct absorption solar collectors with magnetic nanofluids.

Experimental Study of Water-Based Al2O3Nanofluid Flow in Direct Absorption Solar Collector

2015 ◽  
Vol 357 (1) ◽  
pp. 30-37 ◽  
Author(s):  
Hemant Kumar Gupta ◽  
Ghanshyam Das Agrawal ◽  
Jyotirmay Mathur
Keyword(s):  
Experimental Study ◽  
Solar Collector ◽  
Direct Absorption ◽  
Water Based ◽  
Direct Absorption Solar Collector

Performance of a tubular direct absorption solar collector with a carbon-based nanofluid

2021 ◽  
Vol 179 ◽  
pp. 121717
Author(s):  
P.G. Struchalin ◽  
V.S. Yunin ◽  
K.V. Kutsenko ◽  
O.V. Nikolaev ◽  
A.A. Vologzhannikova ◽  
...  
Keyword(s):  
Solar Collector ◽  
Direct Absorption ◽  
Direct Absorption Solar Collector ◽  
Carbon Based

scholarly journals Performance Investigation of High Temperature Application of Molten Solar Salt Nanofluid in a Direct Absorption Solar Collector

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 285 ◽  
Author(s):  
M. Karim ◽  
Owen Arthur ◽  
Prasad Yarlagadda ◽  
Majedul Islam ◽  
Md Mahiuddin
Keyword(s):  
High Temperature ◽  
Molten Salt ◽  
Solar Collector ◽  
Volume Fraction ◽  
Heat Transfer Fluid ◽  
Total Efficiency ◽  
Total System ◽  
Direct Absorption ◽  
Wide Range ◽  
Direct Absorption Solar Collector

Nanofluids have great potential in a wide range of fields including solar thermal applications, where molten salt nanofluids have shown great potential as a heat transfer fluid (HTF) for use in high temperature solar applications. However, no study has investigated the use of molten salt nanofluids as the HTF in direct absorption solar collector systems (DAC). In this study, a two dimensional CFD model of a direct absorption high temperature molten salt nanofluid concentrating solar receiver has been developed to investigate the effects design and operating variables on receiver performance. It has been found that the Carnot efficiency increases with increasing receiver length, solar concentration, increasing height and decreasing inlet velocity. When coupled to a power generation cycle, it is predicted that total system efficiency can exceed 40% when solar concentrations are greater than 100×. To impart more emphasis on the temperature rise of the receiver, an adjusted Carnot efficiency has been used in conjunction with the upper temperature limit of the nanofluid. The adjusted total efficiency also resulted in a peak efficiency for solar concentration, which decreased with decreasing volume fraction, implying that each receiver configuration has an optimal solar concentration.

Sign in / Sign up

Export Citation Format

Share Document