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Life Cycle Assessment of the production phase of Switchable Glass
Fusté Massanas, Sara
Haase, Walter
Switchable glazing systems for architectural application have been developed bymodifying conventional Liquid Crystal technologies for Liquid Crystal Displays industry.They provide shade and visual welfare, improving users comfort without obstructingview to exterior. With its use, requirements for cooling in buildings can be reduced,what involves a contribution to sustainable building. The system is composed by toglass sheets (treated and coated with different layers), which contain inside theelements of liquid crystal and other needed elements. No environmental assessmenthas been made for the switchable element. The purpose of this paper is to assess theenvironmental impact of the production phase of switchable glass.This work is based on Life Cycle Assessment method within the frameworks of ISO14040 and ISO 140444. The tool used to create and model Life Cycle Inventory and toanalyse the result balances is the software GaBi 4 developed by Universtät Stuttgart.The production of the glass substrate is the process with most impact in all impactcategories: Acidification Potential (AP), Eutriphication Potential (EP), Global WarmingPotential (GWP), Ozone Depletion Potential (ODP), and Primary Energy Demand fromNon Renewable Resources (PENREG), except for Photochemical Ozone CreationPotential (POCP). This is caused as result of the fact that the glass substrate is morethan 99% of the mass of the whole switchable glazing element, and its manufacturehas high energy consumption requirements (extraction of raw materials and meltingprocesses principally). Most of POCP impact is due to solvent evaporation during theliquid crystal filling. Waste treatment for the water used to clean the substrates is alsosignificant in most of the impact categories.This work can be used to compare different production systems for elements with thesame function and it is the basis for further to analyse the whole life cycle of this glass,including use phase and end of life analysis as next steps.
2012-06-26
Àrees temàtiques de la UPC::Economia i organització d'empreses::Direcció d'operacions::Anàlisi de processos de negoci i de fabricació
Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials
Glass -- Manufacturing processes
Product life cycle
Vidre -- Fabricació
Cicle de vida del producte
Restricted access - confidentiality agreement
Research/Master Thesis
Universitat Politècnica de Catalunya;
Universität Stuttgart
         

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