Empirical correlations for heat transfer in a silver nanofluid-based direct absorption solar collector

2018 ◽  
Vol 28 ◽  
pp. 14-21 ◽  
Author(s):  
M. Karami ◽  
M. Bozorgi ◽  
S. Delfani ◽  
M.A. Akhavan-Behabadi
Keyword(s):  
Heat Transfer ◽  
Solar Collector ◽  
Direct Absorption ◽  
Empirical Correlations ◽  
Direct Absorption Solar Collector

Numerical Simulation on the Performance of Nanofluid-Based Direct Absorption Solar Collector With Parabolic Trough Concentrator

2016 ◽  
Author(s):  
Wei Chen ◽  
Guoying Xu ◽  
Sainan Zhao ◽  
Xiaosong Zhang
Keyword(s):  
Heat Transfer ◽  
Solar Collector ◽  
Numerical Study ◽  
Radiation Absorption ◽  
Transfer Model ◽  
Direct Absorption ◽  
Operating Characteristics ◽  
Parabolic Trough ◽  
Weight Concentration ◽  
Direct Absorption Solar Collector

Nanofluids obtain high stability, improved heat transfer capability and excellent optical properties, the low-temperature nanofluid-based direct absorption solar collector (NDASC) has been previously investigated. However, the detailed radiation absorption and heat transfer mechanism for a NDASC with a solar concentrator operated on medium-temperature conditions were seldom researched. Therefore, this paper presents a numerical study on the solar collection characteristics of NDASC with a parabolic trough concentrator. CuO/oil nanofluids with various weight concentration from 0.05% to 0.1% were prepared, and used as working fluids of NDASCs, respectively. Using the developed heat transfer model, operating characteristics of NDASCs were simulated. Furthermore, the influences of weight concentration of nanofluids on the heat transfer characteristics in the NDASCs were analyzed and optimum weight concentration used for the designed NDASC obtained.

scholarly journals Performance of Graphite-Dispersed Li2CO3-K2CO3 Molten Salt Nanofluid for a Direct Absorption Solar Collector System

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 375 ◽  
Author(s):  
M. A. Karim ◽  
Majedul Islam ◽  
Owen Arthur ◽  
Prasad KDV Yarlagadda
Keyword(s):  
Heat Transfer ◽  
Molten Salt ◽  
Solar Collector ◽  
Volume Fraction ◽  
Heat Transfer Fluid ◽  
Total Efficiency ◽  
Nanoparticle Volume Fraction ◽  
Direct Absorption ◽  
Solar Salt ◽  
Direct Absorption Solar Collector

Considered to be the next generation of heat transfer fluids (HTFs), nanofluids have been receiving a growing interest over the past decade. Molten salt nanofluids have been shown to have great potential as an HTF for use in high temperature applications such as direct absorption solar collector (DAC) system. Very few studies using molten salt nanofluids as the HTF in a DAC receiver can be found in the open literature. This study aimed to develop a 3D computational fluid dynamics model of the receiver of a DAC using graphite-nanoparticle-dispersed Li2CO3-K2CO3 molten salt nanofluid to investigate the effects of design and operation parameters on receiver performance. Receiver total efficiency using Li2CO3-K2CO3 salt was compared with that using solar salt nanofluid. Spectral properties of the base fluid and nanoparticles were modeled as wavelength-dependent and the absorption of the solar radiation was modeled as a volumetric heat release in the flowing heat transfer fluid. Initial results show that the receiver efficiency increases with increasing solar concentration, decreasing nanoparticle volume fraction, and decreasing receiver length. It was also found that the Carnot efficiency increases with increasing receiver length and nanoparticle volume fraction, and decreasing solar concentration and inlet velocity. Comparative study shows that solar salt HTF could provide higher total efficiency. However, a higher operating temperature of Li2CO3-K2CO3 will allow for a greater amount of thermal energy storage for a smaller volume of liquid.

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
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