Comparative evaluation of reflective and refractive optical concentration systems in tropical climate

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1 Citation (Scopus)

Abstract

Convergence of global economic inequalities and greenhouse emissions makes it imperative that fossil-fuel dependence be replaced by renewable energy revolution. Sunlight is the only truly free and abundant global energy resource capable of replacing fossil fuels. Historically, thermal and electrical forms of energy have been generated through Concentrated Solar Power (CSP) systems. A major disadvantage of existing CSP systems lies in their long lead times, large start-up costs and integration with an advanced electricity transmission grid. Research work reported here is focused on evaluation of reflective and refractive optical concentration systems in tropical climate with the aim of developing small scale distributed electricity generation systems linked to micro grids. Evaluation of seven optical concentrators in reflection and refraction modes in tropical Malaysian climate has been carried out. The experimental methodology was based on measurement of temperature at the focal point of the optical systems as a function of time and solar irradiance. Highest temperatures achieved with reflective systems were in 200-300°C range, in contrast, Fresnel-lens based refractive systems approached temperatures in excess of ~1300°C. For the Fresnel lenses investigated, an approximate logarithmic temperature dependence on lens diameter was determined. For the Malaysian climate, sunlight to thermal energy conversion of refractive systems was determined to be significantly superior to reflective systems.

Original languageEnglish
Pages (from-to)1319-1325
Number of pages7
JournalResearch Journal of Applied Sciences, Engineering and Technology
Volume8
Issue number11
Publication statusPublished - 2014

Fingerprint

Lenses
Fossil fuels
Solar energy
Electricity
Multiplexing equipment
Temperature
Greenhouses
Energy resources
Thermal energy
Refraction
Energy conversion
Optical systems
Economics
Costs
Hot Temperature

Keywords

  • Concentration ratio
  • Efficiency
  • Figure of merit
  • Fresnel lens
  • Stagnation temperature
  • Tropics

ASJC Scopus subject areas

  • Engineering(all)
  • Computer Science(all)

Cite this

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title = "Comparative evaluation of reflective and refractive optical concentration systems in tropical climate",
abstract = "Convergence of global economic inequalities and greenhouse emissions makes it imperative that fossil-fuel dependence be replaced by renewable energy revolution. Sunlight is the only truly free and abundant global energy resource capable of replacing fossil fuels. Historically, thermal and electrical forms of energy have been generated through Concentrated Solar Power (CSP) systems. A major disadvantage of existing CSP systems lies in their long lead times, large start-up costs and integration with an advanced electricity transmission grid. Research work reported here is focused on evaluation of reflective and refractive optical concentration systems in tropical climate with the aim of developing small scale distributed electricity generation systems linked to micro grids. Evaluation of seven optical concentrators in reflection and refraction modes in tropical Malaysian climate has been carried out. The experimental methodology was based on measurement of temperature at the focal point of the optical systems as a function of time and solar irradiance. Highest temperatures achieved with reflective systems were in 200-300°C range, in contrast, Fresnel-lens based refractive systems approached temperatures in excess of ~1300°C. For the Fresnel lenses investigated, an approximate logarithmic temperature dependence on lens diameter was determined. For the Malaysian climate, sunlight to thermal energy conversion of refractive systems was determined to be significantly superior to reflective systems.",
keywords = "Concentration ratio, Efficiency, Figure of merit, Fresnel lens, Stagnation temperature, Tropics",
author = "El-Ladan, {Abdulkarim Hamza} and Ruslan, {Mohd Hafidz} and Chan, {Hoy Yen} and Kamaruzzaman Sopian and Zaidi, {Saleem H.}",
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AU - El-Ladan, Abdulkarim Hamza

AU - Ruslan, Mohd Hafidz

AU - Chan, Hoy Yen

AU - Sopian, Kamaruzzaman

AU - Zaidi, Saleem H.

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AB - Convergence of global economic inequalities and greenhouse emissions makes it imperative that fossil-fuel dependence be replaced by renewable energy revolution. Sunlight is the only truly free and abundant global energy resource capable of replacing fossil fuels. Historically, thermal and electrical forms of energy have been generated through Concentrated Solar Power (CSP) systems. A major disadvantage of existing CSP systems lies in their long lead times, large start-up costs and integration with an advanced electricity transmission grid. Research work reported here is focused on evaluation of reflective and refractive optical concentration systems in tropical climate with the aim of developing small scale distributed electricity generation systems linked to micro grids. Evaluation of seven optical concentrators in reflection and refraction modes in tropical Malaysian climate has been carried out. The experimental methodology was based on measurement of temperature at the focal point of the optical systems as a function of time and solar irradiance. Highest temperatures achieved with reflective systems were in 200-300°C range, in contrast, Fresnel-lens based refractive systems approached temperatures in excess of ~1300°C. For the Fresnel lenses investigated, an approximate logarithmic temperature dependence on lens diameter was determined. For the Malaysian climate, sunlight to thermal energy conversion of refractive systems was determined to be significantly superior to reflective systems.

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KW - Stagnation temperature

KW - Tropics

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