S4.5+-+Mass+Balances,+Recycling,+Product+Lifetimes.pptx

S4.5+-+Mass+Balances,+Recycling,+Product+Lifetimes.pptx -...

This preview shows page 1 - 5 out of 12 pages.

Brian R. Ellis Assistant Professor, Civil and Environmental Engineering S4.5 MASS BALANCES, RECYCLING, AND PRODUCT LIFETIMES CEE 265: Sustainable Engineering Principles
Image of page 1

Subscribe to view the full document.

2 So Why Should We Care about Resource Consumption? Energy intensity (MJ/ton) of every unit of resource extracted will likely increase New reserves may be located in fragile ecosystems or locations with volatile and inequitable social and/or political climates Ecological impacts (toxicity, water consumption, etc.) of resource extraction (mining is the largest producer of solid waste world-wide) Efficiency Geo-Politics
Image of page 2
3 Mass Balance and Recycling Production Process In material accounting assessment of manufacturing processes and consumer products, we consider it a steady state system (no accumulation) This is like a checking account at the bank!
Image of page 3

Subscribe to view the full document.

4 Mass Balance and Recycling Production Process In recycle systems we are often interested in total mass in and out of the sub-system over time, so we also can write
Image of page 4
5
Image of page 5
You've reached the end of this preview.
  • Winter '12
  • Dr.KimHayes

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern