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study guide final - NPRE101/ENVST 101 Spring 2009 Professor...

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NPRE101/ENVST 101 Spring 2009 Professor Ruzic Exam #2 Wednesday May 13 th from 7:00 – 10:00 PM Note: It will consist of questions from this study guide plus the homework you’ve been assigned on these subjects. RENEWABLE ENERGY SOURCES SOLAR 1. What is the difference between passive and active solar? 2. How does a salt pond work, pros and cons? 3. How does a solar hot water heater and solar cooker work? 4. What passive solar designs are possible (Trimble wall, Brasolle, Thermopane Windows)? 5. How a solar cell actually works (n-type, p-type, electron diffusion, depletion region, ion\electron pair) 6. Cost of PV solar (be able to convert price per peak Watt to $/kW*hour). 7. Discuss “balance of system” and its effects on economics. 8. What is passive solar architecture? WIND POWER 1. Origin of Wind 2. How a windmill works – power’s relationship to size & speed 3. How an airplane flies (Bernoulli’s Principle) 4. Why does a balloon stay above a fan? 5. Low-speed high-torque vs. high-speed low-torque mills FUEL CELLS / GEOTHERMAL 3. What is geothermal energy and how does is differ from Geothermal loops? 4. What where and how is it used. 5. What are geothermal loops, how do they work and what is the real source of energy? WAVES, TIDES, AND OCEAN THERMAL 1. What are the drawbacks to tidal energy systems? 2. How do you get your power from waves? Tides? Are these methods used? What is their future? 3. Why are there two tides (i.e. two low and two high tides) a day? BIOMASS AND BIOFUELS 1. How does wood compare to coal and oil as an energy source? 2. What are the advantages and disadvantages of Crop residue? 3. What are wet and dry refuse? How much energy can we get? 5. What are the advantages and disadvantages of wet and dry refuse as an energy source? GASOHOL 1. What is gasohol. 4. Discuss the significance of gasohol as an energy source.
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