Lecture 18 - What you should have learned: Introduction to...

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Department of Civil and Environmental Engineering The University of Michigan at Ann Arbor Professor Kim F. Hayes CEE 260: Introduction to Environmental and Sustainable Engineering Systems Models and Mass/Energy Balance in Life Cycle Assessment Read Chapter 11 of Boustead Intro to LCA (Handout) V: Ch. 3 (pg. 45-48, 61-64); What you should have learned: What you should have learned: Introduction to Life Cycle Assessment Calculations Introduction to Life Cycle Assessment Calculations How is systems modeling (i.e., “box models”) applied to life cycle assessment calculations? How are stoichiometric conversions treated in mass balance systems? How can energy balances be applied to a recycling system to determine whether recycling saves energy or not? Is energy savings the only reason to recycle? Can the mass balance approach be utilized to determine whether recycling reduces emissions also? How can the total mass utilization of a process subject to recycling be calculated? How do “closed loop” recycling systems differ from “open loop” recycling systems? How are recycling systems with losses treated computationally different from systems without losses? Life-Cycle Thinking Life-Cycle Stages of an Automobile Atmospheric Emissions Coproducts Raw Materials Acquisition Manufacturing Stage Materials Manufacture Product Fabrication Fil ing/Packaging/Distrib. Use/Reuse/Maintenance Recycle/Waste Mgt. ACCRUE INPUTS Raw Materials Energy ACCRUE OUTPUTS Waterborne Wastes Solid Wastes Life-Cycle Model System Boundary Life-Cycle Assessment Begins with the Unit Process
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Before we go further… How does this “Materials and Energy Flows Analysis” relate to the mass balance and reactor theory you have already learned?
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This note was uploaded on 04/17/2008 for the course CEE 260 taught by Professor Kimf.hayes during the Fall '06 term at University of Michigan.

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Lecture 18 - What you should have learned: Introduction to...

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