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| Type | Conference or Workshop Paper |
| Scope | Discipline-based scholarship |
| Published in Proceedings | Yes |
| Title | Service lifetime and storage time of devices with liquid crystal displays |
| Organization Unit | |
| Authors |
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| Editors |
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| Presentation Type | paper |
| Item Subtype | Original Work |
| Refereed | Yes |
| Status | Published in final form |
| Language |
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| Page Range | 357 - 364 |
| Event Title | PLATE – Product Lifetimes And The Environment |
| Event Type | conference |
| Event Location | Nottingham |
| Event Start Date | June 17 - 2015 |
| Event End Date | June 19 - 2015 |
| Place of Publication | Nottingham |
| Publisher | Nottingham Trent University: CADBE |
| Abstract Text | Electronic devices contain many important resources, including critical chemical elements such as indium or neodymium. For an efficient management of these resources, it is important to know where the devices are located, how long they are used for and when and how they are disposed of. This article presents a dynamic material flow analysis of devices with liquid crystal displays; i.e. flat screen televisions and monitors, laptops and mobile phones, and the subsequent indium flows in Switzerland. The stock of the use phase within the material flow system has been split into an in-use stock and a storage stock. The outflows have been modelled by applying two lifetime distribution functions, one for the service lifetime and one for the storage time. Results highlight the importance of the storage time, being for flat screen TVs of 2.6 years, and for monitors, laptops and mobile phones of over 4 years. For monitors and laptops, the storage stock accounts for around 20%, and for mobile phones 35% of their total stock. These devices in Switzerland represent an indium stock of over 1'800 kg, an indium inflow with new products of 200 kg/year and an outflow with discarded devices of only 90 kg/year. Outflows of the model that includes storage time are significantly lower and show better congruence with actually measured flows. This shows that the storage time slows down the reintegration of secondary resources into the material cycles and therefore increases the stock of resources. |
| Free access at | Official URL |
| Official URL | http://www4.ntu.ac.uk/plate_conference/PLATE_2015_proceedings.pdf |
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