Lecture 11 - MECH317 Mechanical Design and Analysis Lecture...

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MECH317 Mechanical Design and Analysis Lecture 11: Evaluating properties of fluids Dr. Xiaobin Le, P. Eng Office: Kingman hall 209 Email: [email protected] Phone:617-989-4223
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Contents A.Energy vs. environments B.Evaluating properties of fluids C.Simulation of a Process by EES Objectives Review the thermodynamic I Know how to use EES to get the properties of fluids Know how to use EES to simulate the process from one state to another state.
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The heat engine project The MECH317 –mechanical design and analysis
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Energy conversion processes are often accompanied by environmental pollution. A: ENERGY AND ENVIRONMENT The conversion of energy from one form to another often affects the environment and the air we breathe in many ways, and thus the study of energy is not complete without considering its impact on the environment. Pollutants emitted during the combustion of fossil fuels are responsible for smog , acid rain , and global warming . The environmental pollution has reached such high levels that it became a serious threat to vegetation , wild life , and human health . Motor vehicles are the largest source of air pollution. 2-4
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Ground-level ozone, which is the primary component of smog, forms when HC and NO x react in the presence of sunlight in hot calm days. Ozone and Smog Smog : Made up mostly of ground-level ozone (O 3 ), but it also contains numerous other chemicals, including carbon monoxide (CO), particulate matter such as soot and dust, volatile organic compounds (VOCs) such as benzene, butane, and other hydrocarbons. Hydrocarbons and nitrogen oxides react in the presence of sunlight on hot calm days to form ground-level ozone. Ozone irritates eyes and damages the air sacs in the lungs where oxygen and carbon dioxide are exchanged, causing eventual hardening of this soft and spongy tissue. It also causes shortness of breath, wheezing, fatigue, headaches, and nausea, and aggravates respiratory problems such as asthma. The other serious pollutant in smog is carbon monoxide , which is a colorless, odorless, poisonous gas. It is mostly emitted by motor vehicles. It deprives the body’s organs from getting enough oxygen by binding with the red blood cells that would otherwise carry oxygen. It is fatal at high levels. Suspended particulate matter such as dust and soot are emitted by vehicles and industrial facilities. Such particles irritate the eyes and the lungs. 2-5
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Sulfuric acid and nitric acid are formed when sulfur oxides and nitric oxides react with water vapor and other chemicals high in the atmosphere in the presence of sunlight.
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  • Fall '11
  • Olia
  • Energy, Greenhouse gas, Sulfur dioxide

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