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Recycling 2017, 2(2), 10; doi:10.3390/recycling2020010

Energy Payback Time of a Solar Photovoltaic Powered Waste Plastic Recyclebot System

1
Department of Materials Science & Engineering, Michigan Technological University, Houghton, MI 49931, USA
2
Department of Electrical & Computer Engineering, Michigan Technological University, Houghton, MI 49931, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Michele Rosano
Received: 25 April 2017 / Revised: 31 May 2017 / Accepted: 8 June 2017 / Published: 15 June 2017
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Abstract

The growth of both plastic consumption and prosumer 3-D printing are driving an interest in producing 3-D printer filaments from waste plastic. This study quantifies the embodied energy of a vertical DC solar photovoltaic (PV) powered recyclebot based on life cycle energy analysis and compares it to horizontal AC recyclebots, conventional recycling, and the production of a virgin 3-D printer filament. The energy payback time (EPBT) is calculated using the embodied energy of the materials making up the recyclebot itself and is found to be about five days for the extrusion of a poly lactic acid (PLA) filament or 2.5 days for the extrusion of an acrylonitrile butadiene styrene (ABS) filament. A mono-crystalline silicon solar PV system is about 2.6 years alone. However, this can be reduced by over 96% if the solar PV system powers the recyclebot to produce a PLA filament from waste plastic (EPBT is only 0.10 year or about a month). Likewise, if an ABS filament is produced from a recyclebot powered by the solar PV system, the energy saved is 90.6–99.9 MJ/kg and 26.33–29.43 kg of the ABS filament needs to be produced in about half a month for the system to pay for itself. The results clearly show that the solar PV system powered recyclebot is already an excellent way to save energy for sustainable development. View Full-Text
Keywords: energy payback time; distributed manufacturing; life cycle analysis; photovoltaic; recycling; solar energy; recyclebot; 3-D printing; polymer filament; EPBT energy payback time; distributed manufacturing; life cycle analysis; photovoltaic; recycling; solar energy; recyclebot; 3-D printing; polymer filament; EPBT
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhong, S.; Rakhe, P.; Pearce, J.M. Energy Payback Time of a Solar Photovoltaic Powered Waste Plastic Recyclebot System. Recycling 2017, 2, 10.

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