Midterm Review

# Midterm Review - Engineering 100 Study Guide Life Stages of...

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Engineering 100 - Study Guide - Life Stages of Product/Processes o Pre-manufacturing o Manufacturing o Distribution o Use o Disposal - Environmental Issues o Air Pollution o Water Pollution o Solid Waste o Energy Consumption - “Master” Equation Environmental Impact = ((environmental impact)/Unit GDP) * population * ((GDP)/person) GDP/person  = consumption/person Environmental impact/Unit GDP  = only thing we can control. Must decrease 6-10x to keep up with increasing population. - “Zero Order” o Appearance Rate of change, K₀, is a constant Dx/dt = K₀ t=time X=some parameter k₀= rate of change C = initial concentration X= C + k₀t o Disappearance Dx/dt = -k₀ X= C - k₀t - “first Order” Rate at which a parameter changes depends on how much you have! o Appearance Dx/dt = k₁X X= Ce k₁t o Disappearance Dx/dt = - k₁X X= Ce -k₁t

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- Mass Balance *Considering movement of material in a system * A scientific way of accounting where “stuff” goes using a simple rule… -MASS CAN NEVER BE CREATED NOR DESTROYED, BUT CAN BE TRANSFORMED MASS IN = MASS OUT MASS RATE IN = MASS RATE OUT o
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• Fall '07
• Winarsky/Hildinger
• Net Present Value, energy consumption, Life cycle assessment, cash ﬂow diagram

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