Abstract
Parabolic trough solar collector systems are the most advanced concentrating solar power technology for large-scale power generation purposes. The current work reviews various selective coating materials and their characteristics for different designs in concentrating solar power. Solar selective absorbing coatings collect solar radiation and convert it to heat. To promote higher efficiency and lower energy costs at higher temperatures requires, this study aims to analyse the fundamental chemistry and thermal stability of some key coatings currently being used and even under investigation to find reasons for differences, information gaps and potential for improvement in results. In recent years, several novel and useful solar absorber coatings have been developed. However, qualification test methods such as corrosion resistance, thermal stability testing and prediction of service life, which have essential technical value for large-scale solar absorbers, are lacking. Coatings are used to enhance the performance of reflectors and absorbers in terms of quality, efficiency, maintenance and cost. Differentiated coatings are required as there are no uniformly perfect materials in various applications, working conditions and material variations. Much more knowledge of the physical and chemical properties and durability of the coatings is required, which will help prevent failures that could not be discovered previously.
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19 September 2022
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Abbreviations
- A a :
-
aperture area of the collector/m2
- A co :
-
outer cover area/m2
- A ri :
-
inlet area of the receive tube/m2
- A ro :
-
outer area of the receive tube/m2
- C :
-
concentration ratio
- c p :
-
specific heat capacity/kJ·(kg·K)−1
- D ri :
-
inner diameter of the receiver tube/m
- D ro :
-
outer diameter of the receiver tube/m
- D ci :
-
inner diameter of the cover tube/m
- D co :
-
outer diameter of the cover tube/m
- f :
-
collector focal distance/m
- h :
-
convection heat transfer coefficient/W·(m2·K)−1
- h out :
-
cover to ambient heat transfer coefficient/W·(m2·K)−1
- I b :
-
direct beam radiation/W·m−2
- K :
-
incidence angle/(°)
- k :
-
thermal conductivity/W·(m·K)−1
- k eff :
-
effective thermal conductivity/W·(m·K)−1
- L :
-
collector width/m
- m :
-
mass flow rate/kg·s−1
- Nu :
-
Nusselt number
- Pr :
-
Prandtl number
- Q abs :
-
absorbed thermal energy/W
- Q conv :
-
convocation heat transfer/W
- Q loss :
-
thermal losses of the absorber/W
- Q rad :
-
radiation heat transfer/W
- Q s :
-
solar radiation on the PTSC aperture/W·m−2
- Q u :
-
useful heat/W
- Re :
-
Reynolds number
- T amb :
-
ambient temperature/°C
- T c :
-
cover temperature/°C
- T ci :
-
inner cover temperature/°C
- T htf :
-
temperature of heat transfer fluid,/°C
- T in :
-
inlet temperature of the heat transfer fluid/°C
- T out :
-
outlet temperature of the heat transfer fluid/°C
- T ro :
-
outer receiver temperature/°C
- T rm :
-
mean temperature of receiver/°C
- T sky :
-
sky temperature/°C
- U L :
-
thermal loss coefficient/W·(m2·K)−1
- V wind :
-
ambient air velocity/m·s−1
- W :
-
collector width/m
- x :
-
coordinate in x-axis/m
- y :
-
coordinate in y-axis/m
- α :
-
Absorptivity
- γ :
-
intercept factor
- ε c :
-
cover emittance
- ε r :
-
receiver emittance
- θ :
-
angle of incidence of solar radiations/(°)
- η :
-
intrinsic viscosity
- η opt :
-
optical efficiency of the collector
- η opt-max :
-
maximum optical efficiency
- η th :
-
thermal efficiency
- μ :
-
dynamic viscosity/kg·(m·s)−1
- ρ :
-
reflectivity; density/kg·m−3
- σ :
-
Stefan Boltzmann constant/W·(m2·K4)−1
- τ :
-
Transmissivity
- Φ r :
-
rim angle/(°)
- φ :
-
particle concentration/%
- φ max :
-
maximum particle added to the fluid
- a:
-
aperture
- amb:
-
ambient
- b:
-
beam radiation
- c:
-
cover
- f:
-
fluid
- hnf:
-
hybrid nanofluid
- htf:
-
heat transfer fluid
- in:
-
inlet
- max:
-
maximum
- nf:
-
nanofluid
- opt:
-
optical
- out:
-
outlet
- p:
-
particle
- ri:
-
inner receiver
- r:
-
local mirror radius
- ro:
-
outer receiver
- s:
-
solar
- th:
-
thermal
- tot:
-
total
- u:
-
useful
- CFD:
-
computational fluid dynamics
- EXP:
-
Experimental
- NFs:
-
nanofluids
- PTSC:
-
Parabolic Trough Solar Collector
- TS:
-
thermal stability
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Acknowledgments
This work was supported by the Stipendium Hungaricum Program and by the Doctoral School of Mechanical Engineering, Hungarian University of Agriculture and Life Sciences, Gödöllő, Hungary.
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Asaad Yasseen, AR., Istvan, S. & Istvan, F. Selective Absorber Coatings and Technological Advancements in Performance Enhancement for Parabolic Trough Solar Collector. J. Therm. Sci. 31, 1990–2008 (2022). https://doi.org/10.1007/s11630-022-1634-5
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DOI: https://doi.org/10.1007/s11630-022-1634-5