sol to add q's in liffe cycle

Sol to add q's in - University of British Columbia Okanagan School of Engineering APSC257 Principles of Engineering Design Additional Questions for

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1 University of British Columbia, Okanagan School of Engineering APSC257 – Principles of Engineering Design Additional Questions for Life Cycle Assessment Q1) A life cycle assessment (LCA) can be a valuable tool for minimizing the environmental damage caused by manufacturing, using, and disposing of products. Yet, LCA is not in widespread use. Discuss several reasons for this, and explain whether you feel LCA will play a more prominent role in environmental protection in the future. Solution LCA is not yet in widespread use for a number of reasons. Some possible reasons include: a) The use of LCA requires a large amount of data for inputs and outputs, and such data are rarely available for most products. The example used in this chapter, namely computer housing, is one of the few products that has been subjected to study. b) Even for those products where data exist, the reliability of the data are often in question. c) Defining the boundaries of LCA is somewhat arbitrary. The results of the assessment can vary greatly, depending on where the boundaries are drawn. d) Performing an LCA is very expensive due to the original data gathering that is necessary to obtain the inputs, outputs, and effects. e) There is no single LCA method that is universally acceptable. f) Although it is possible to begin a Life Cycle Assessment by conducting an Inventory Analysis, an Impact Analysis requires knowledge of environmental effects that have not yet been studied except in a few circumstances. Furthermore, Improvement Analysis requires more information about alternative processes than is usually available. A great deal of research is needed to fill these gaps. g) Changing markets and technologies can have a dramatic effect on the results of LCA calculations. Yet obtaining the input data to conduct an LCA requires a great deal of time and effort even when assuming unchanging conditions. h) It is likely that LCA will play a more prominent role in the future as more data
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This note was uploaded on 03/28/2011 for the course APSC 254 taught by Professor Stephen during the Spring '11 term at The University of British Columbia.

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Sol to add q's in - University of British Columbia Okanagan School of Engineering APSC257 Principles of Engineering Design Additional Questions for

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