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Exergy Optimization of a Solar Collector in Flat Plate Shape Equipped with Elliptical Pipes Filled with Turbulent Nanofluid Flow: A Study for Thermal Management
- Source :
- Water, Volume 12, Issue 8, Water, MDPI, 2020, 12 (8), pp.2294. ⟨10.3390/w12082294⟩, Water, Vol 12, Iss 2294, p 2294 (2020)
- Publication Year :
- 2020
- Publisher :
- MDPI AG, 2020.
-
Abstract
- In this paper, forced convection of a multiwalled carbon nanotube (MWCNT)&ndash<br />water nanofluid (NF) in a new flat plate solar collector (FPSC) equipped with elliptical pipes instead of circular ones is investigated. The three-dimensional conservation equations were solved in the domain with the finite volume method (FVM) based on the semi-implicit method for pressure linked equations (SIMPLE) algorithm. The laminar-turbulent range of the Reynolds number (Re) and the volume fraction of the NF (ϕ) were 50&ndash<br />12,000 and 0&ndash<br />0.1, respectively. The optimization process was accomplished through the comparison of diverse parameters to attain the optimal case with the highest exergy efficiency. In this study, it was concluded that, in the case of using elliptical pipes instead of circular tubes, the time that the fluid was inside the FPSC increased, which led to an increase in the outlet temperature, while the exergy efficiency of the FPSC increased. Additionally, it was observed that using elliptical pipes enhanced the outlet fluid temperature, energy efficiency, and exergy efficiency. Generally, while the trend of exergy efficiency variation with effective parameters was rising, applying elliptical pipes caused the efficiency to increase. In addition, the exergy efficiency variation decreased when these parameters were changed. The highest value of exergy efficiency was 7.1%. On the other hand, for each specific FPSC, there was a unique mass flow rate at which the exergy efficiency reached its maximum value, and for higher mass flow rates, the efficiency was slightly diminished and then remained unchanged. Finally, the highest exergy efficiency was achieved for ϕ = 0.10%.
- Subjects :
- Exergy
lcsh:Hydraulic engineering
Materials science
020209 energy
Mass flow
Geography, Planning and Development
02 engineering and technology
Aquatic Science
7. Clean energy
Biochemistry
Physics::Fluid Dynamics
[SPI]Engineering Sciences [physics]
Condensed Matter::Materials Science
symbols.namesake
lcsh:Water supply for domestic and industrial purposes
Nanofluid
lcsh:TC1-978
0202 electrical engineering, electronic engineering, information engineering
Mass flow rate
Astrophysics::Solar and Stellar Astrophysics
ComputingMilieux_MISCELLANEOUS
Physics::Atmospheric and Oceanic Physics
Water Science and Technology
lcsh:TD201-500
Turbulence
elliptical pipe
Reynolds number
Mechanics
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
Forced convection
symbols
Exergy efficiency
nanofluid
exergy optimization
0210 nano-technology
flat plate solar collector
Subjects
Details
- ISSN :
- 20734441
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Water
- Accession number :
- edsair.doi.dedup.....8aa290c257b303f4405be524b40e2847