Life Cycle Analysis Homework 22.83/2.183 Environmentally Benign ManufacturingSpring 20071. Redo “comparison of electronic computers and motor vehicles” using 1997 data on CMU website.Environmental Impact of Computers vs. Automobiles for $1 Million Dollars ofActivity in 1997 (data from CMU EIO-LCA website) Impact ElectronicComputers#334111Automobile and LightTruck Manufacturing# 336110Direct Economic Effect 2.73 2.88Energy (TJ) 4.32 7.57Toxic Releases (kg) 654 1420GWP (tonnes of CO2E) 416 628Total Employees 14.8 13.82. Repeat above using weight as the denominator Per Williams a computer is 24 kg and costs $1700 in the year 2000 – deflate thisto 1997 dollars using a factor of 0.97 – therefore a computer is $1,649. Therefore, 1000 kg = $68,708 Per Sullivan a typical passenger car is 1532 kg and from the slides $/Auto = $9,047.62. Therefore 1000 kg = $5,906Environmental Impact of Computers vs. Automobiles for 1000 kg of Activity in1997 (data from CMU EIO-LCA website) Impact ElectronicComputers#334111Automobile and LightTruck Manufacturing# 336110Direct Economic Effect 0.188 0.017Energy (TJ) 0.297 0.045Toxic Releases (kg) 44.9 8.39GWP (tonnes of CO2E) 28.6 3.71Total Employees 1.02 0.0823. Compare the energy intensity of telecommunications and air transport using the CMU website Impact Telecommunications# 513300Air Transportation # 481000Energy (TJ/ million $) 2.30 26.24. Do you think the PDA is a substitute for the newspaper?No. I don’t know anyone that reads the newspaper on their PDA. However, I do think that the computer – laptop or desktop – would be a substitute for the newspaper.However, in order to run a comparison between the two forms of communication, youwould need to know how much of the computers active time is dedicated to reading online publications. 5. Estimate the target plot for a laptop Vs the desktop computerTarget Plot: Laptop vs. Desktop ValuePosition Life Cycle Phase Impact Laptop Desktop(1,1) Pre-Manufacturing Materials Choice 0 0(1,2) Pre-Manufacturing Energy Use 2 1(1,3) Pre-Manufacturing Solid Residue 1 1(1,4) Pre-Manufacturing Liquid Residue 2 2(1,5) Pre-Manufacturing Gas Residue 1 1(2,1) Product Manufacture Materials Choice 1 1(2,2) Product Manufacture Energy Use 1 1(2,3) Product Manufacture Solid Residue 1 1(2,4) Product Manufacture Liquid Residue 1 1(2,5) Product Manufacture Gas Residue 1 1(3,1) Product Delivery Materials Choice 3 3(3,2) Product Delivery Energy Use 3 2(3,3) Product Delivery Solid Residue 3 2(3,4) Product Delivery Liquid Residue 4 4(3,5) Product Delivery Gas Residue 3 2(4,1) Product Use Materials Choice 2 2(4,2) Product Use Energy Use 2 1(4,3) Product Use Solid Residue 3 3(4,4) Product Use Liquid Residue 3 3(4,5) Product Use Gas Residue 2 1(5,1) Refurbishment/Recycling/Disposal Materials Choice 1 1(5,2) Refurbishment/Recycling/Disposal Energy Use 2 1(5,3) Refurbishment/Recycling/Disposal Solid Residue 1 1(5,4) Refurbishment/Recycling/Disposal Liquid Residue 3 3(5,5) Refurbishment/Recycling/Disposal Gas Residue 2
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