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Thermal selective coatings and its enhancement characteristics for efficient power generation through parabolic trough collector (PTC)

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Abstract

World climate is an area of concern due to the use of fossil fuels that have been the most commonly preferred resource of energy since the industrial revolution and urbanization. The target to maintain the lowest level of carbon emissions and greenhouse gases has created an urge to look for renewable energy resources. Among the renewable energy resources available worldwide, solar energy is considered as one of the feasible and mature technologies in view of large-scale commercial deployment. Solar photovoltaic and solar thermal conversion (STC) techniques have been implemented so far and are still advancing towards cost-effective solutions. Parabolic trough collector (PTC) is one such economical and feasible STC technology as far as high-temperature thermal applications are concerned and are being widely used for power generation. This paper is an attempt to present the current scenario of PTC technology along with its various advancements over the years. Further in this paper, selective coatings, coating techniques and heat collection element (HCE) or receiver are discussed in detail with regard to their advancements. The present work also illustrates the progressive trends in PTC technology, particularly with respect to various heat transfer fluids, HCE inserts, selective coatings and other performance factors along with some futuristic aspects with respect to coatings and receiver inserts in view of high thermal performance.

Graphic abstract

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Abbreviations

AFM:

Atomic force microscopy

CFD:

Computational fluid dynamics

CSP:

Concentrating solar power

CVD:

Chemical vapour deposition

DSC:

Differential scanning calorimetry

DSG:

Direct steam generation

ERD:

Elastic recoil detection

EDAX:

Energy-dispersive X-ray analysis

FTIR:

Fourier transform infrared spectroscopy

FVM:

Finite volume method

GHGs:

Greenhouse gases

HCE:

Heat collection element

HTF:

Heat transfer fluid

ISG:

Indirect steam generation

LCoE:

Levelized cost of energy

MCRT:

Monte Carlo ray trace

MWCNT:

Multi-walled carbon nanotubes

NP:

Nanoparticle

PTC:

Parabolic trough collector

SEM:

Scanning electron microscopy

SPV:

Solar photovoltaic

STC:

Solar thermal conversion

TEM:

Transmission electron microscopy

TGA:

Thermogravimetric analysis

UV-Vis:

Ultraviolet visible spectrometry

XRD:

X-ray diffraction

\(\psi_{j}\) :

Optical thickness of layer

ϕ j :

Angle of refraction

\(u_{j}\) :

Effective refractive index

\(\Delta \varepsilon\) :

Influencing factor of core material

f* :

Ratio of inner volume of sphere to whole volume of sphere

n j :

Refractive index

fA and fB :

Value fraction or filling factor

\(\varepsilon_{A}\) and \(\varepsilon_{B}\) :

Dielectric constants

Z1 and Z2 :

No. of configurations

MG:

Maxwell Garnett

PS:

Ping Sheng

Br:

Bruggeman

BH:

Bruggeman–Hanai

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Acknowledgements

The authors acknowledge the language editing and technical editing for grammar errors support received from Dr. Anurag Kumar, Assistant Professor, School of Languages and Literature, SMVD University and Dr. Garima Gupta, Assistant Professor, Department of English, University of Jammu, J & K.

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Thappa, S., Chauhan, A., Sawhney, A. et al. Thermal selective coatings and its enhancement characteristics for efficient power generation through parabolic trough collector (PTC). Clean Techn Environ Policy (2020). https://doi.org/10.1007/s10098-020-01820-3

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Keywords

  • Heat collection element (HCE)
  • Heat transfer fluid (HTF)
  • Parabolic trough collector (PTC)
  • Selective coatings