Assessment of the energy recovery potential of waste Photovoltaic (PV) modules

Charlie Farrell, Ahmed I. Osman , Xiaolei Zhang, Adrian Murphy, Rory Doherty, Kevin Morgan, David W. Rooney, John Harrison, Rachel Coulter, Dekui Shen

Research output: Contribution to journalArticle

Abstract

Global exponential increase in levels of Photovoltaic (PV) module waste is an increasing concern. The purpose of this study is to investigate if there is energy value in the polymers contained within first-generation crystalline silicon (c-Si) PV modules to help contribute positively to recycling rates and the circular economy. One such thermochemical conversion method that appeals to this application is pyrolysis. As c-Si PV modules are made up of glass, metal, semiconductor and polymer layers; pyrolysis has potential not to promote chemical oxidation of any of these layers to help aid delamination and subsequently, recovery. Herein, we analysed both used polymers taken from a deconstructed used PV module and virgin-grade polymers prior to manufacture to determine if any properties or thermal behaviours had changed. The calorific values of the used and virgin-grade Ethylene vinyl acetate (EVA) encapsulant were found to be high, unchanged and comparable to that of biodiesel at 39.51 and 39.87 MJ.Kg^−1, respectively. This result signifies that there is energy value within used modules. As such, this study has assessed the pyrolysis behaviour of PV cells and has indicated the energy recovery potential within the used polymers found in c-Si PV modules.
LanguageEnglish
Article number5267
Number of pages13
JournalScientific Reports
Volume9
Early online date27 Mar 2019
DOIs
Publication statusPublished - 01 Dec 2019

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Recovery
Polymers
Pyrolysis
Crystalline materials
Silicon
Calorific value
Photovoltaic cells
Biodiesel
Delamination
Recycling
Ethylene
Semiconductor materials
Glass
Oxidation
Metals

Cite this

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title = "Assessment of the energy recovery potential of waste Photovoltaic (PV) modules",
abstract = "Global exponential increase in levels of Photovoltaic (PV) module waste is an increasing concern. The purpose of this study is to investigate if there is energy value in the polymers contained within first-generation crystalline silicon (c-Si) PV modules to help contribute positively to recycling rates and the circular economy. One such thermochemical conversion method that appeals to this application is pyrolysis. As c-Si PV modules are made up of glass, metal, semiconductor and polymer layers; pyrolysis has potential not to promote chemical oxidation of any of these layers to help aid delamination and subsequently, recovery. Herein, we analysed both used polymers taken from a deconstructed used PV module and virgin-grade polymers prior to manufacture to determine if any properties or thermal behaviours had changed. The calorific values of the used and virgin-grade Ethylene vinyl acetate (EVA) encapsulant were found to be high, unchanged and comparable to that of biodiesel at 39.51 and 39.87 MJ.Kg^−1, respectively. This result signifies that there is energy value within used modules. As such, this study has assessed the pyrolysis behaviour of PV cells and has indicated the energy recovery potential within the used polymers found in c-Si PV modules.",
author = "Charlie Farrell and Osman, {Ahmed I.} and Xiaolei Zhang and Adrian Murphy and Rory Doherty and Kevin Morgan and Rooney, {David W.} and John Harrison and Rachel Coulter and Dekui Shen",
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Assessment of the energy recovery potential of waste Photovoltaic (PV) modules. / Farrell, Charlie; Osman , Ahmed I.; Zhang, Xiaolei; Murphy, Adrian; Doherty, Rory; Morgan, Kevin; Rooney, David W.; Harrison, John; Coulter, Rachel; Shen, Dekui.

In: Scientific Reports, Vol. 9, 5267, 01.12.2019.

Research output: Contribution to journalArticle

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AU - Osman , Ahmed I.

AU - Zhang, Xiaolei

AU - Murphy, Adrian

AU - Doherty, Rory

AU - Morgan, Kevin

AU - Rooney, David W.

AU - Harrison, John

AU - Coulter, Rachel

AU - Shen, Dekui

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AB - Global exponential increase in levels of Photovoltaic (PV) module waste is an increasing concern. The purpose of this study is to investigate if there is energy value in the polymers contained within first-generation crystalline silicon (c-Si) PV modules to help contribute positively to recycling rates and the circular economy. One such thermochemical conversion method that appeals to this application is pyrolysis. As c-Si PV modules are made up of glass, metal, semiconductor and polymer layers; pyrolysis has potential not to promote chemical oxidation of any of these layers to help aid delamination and subsequently, recovery. Herein, we analysed both used polymers taken from a deconstructed used PV module and virgin-grade polymers prior to manufacture to determine if any properties or thermal behaviours had changed. The calorific values of the used and virgin-grade Ethylene vinyl acetate (EVA) encapsulant were found to be high, unchanged and comparable to that of biodiesel at 39.51 and 39.87 MJ.Kg^−1, respectively. This result signifies that there is energy value within used modules. As such, this study has assessed the pyrolysis behaviour of PV cells and has indicated the energy recovery potential within the used polymers found in c-Si PV modules.

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