Tai Exam 3 Essays

Tai Exam 3 Essays - Exam 3 Essays (33 points) Please save a...

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Exam 3 Essays (33 points) Please save a copy of this document and type your answers beneath each question. Keep the present format. Resave and rename the file with your last name at the beginning of the filename (i.e., Smith Exam 3 Essays), and submit it as an attachment to the dropbox. 1. What are 6 things you could do personally to contribute to more efficient water use? (3 points) ANS: I will not wash my clothes everyday; I will wait for a week to wash my clothes. I will take a quick shower instead of taking a bath. When I washing the vegetables, I will not keep turning the faucet on, I will just save a bowl of water to wash them. After washing the vegetables, I can use that water to irrigate my plants, and it can reuse water. I will close the faucets when I am washing my face. Also, I will use as less as dishes to do cooking, because it can save water to not wash that many dishes. 2. Compare and contrast active and passive solar energy. Consider factors such as energy efficiency, cost, and other factors. What purposes and conditions are they each best utilized? (4 points) ANS: A passive solar energy is about absorbing and restoring the energy directly, and the energy efficient is the house faces direct to the sun and get the solar energy. Walls, floors of concrete, adobe, brick, stone, and salt- treated timber, and water in metal or plastic can store much energy to supply the heat during a day. Usually, with a good design of passive solar system, it should be the cheapest way to apply heat for a house, for example, this system costs extra 5-10 % to the construction cost, but the life-cycle cost of operating such a house is 30-40 % lower, so it will pay back for the construction cost and save our resources. There are some disadvantages of using passive solar energy, if the building or house is blocking by trees and could not get the solar energy, then this system is not working for it. An active energy is about absorbing the solar energy from the sun by pumping a heat- absorbing fluid through a special collector which put on the roof to face the sun to get energy. Some of the heat can be used directly, or it can be stored and we can use it when we use it, also an active solar collector can supply hot water too. Same with the passive solar heating system, the active one is also need to work in the sunny areas, if not they could not work. Although it is a very good way to heat water by the active solar heating system, but it costs a lot to do that, and it is hard to maintain the requirements, and the unappealing appearance.
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3. a. How has sewage been treated in rural areas in the US? B. How has sewage been treated in urban areas in the US? Briefly discuss possible alternative sewage treatment ideas. Include examples of areas (countries, counties, cities) where alternatives are in place. (5 points) ANS: In rural areas in U.S. each house has been treaded the sewage through a septic tank,
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This note was uploaded on 09/18/2009 for the course BIO 120 taught by Professor Staff during the Fall '07 term at USC.

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Tai Exam 3 Essays - Exam 3 Essays (33 points) Please save a...

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