lec1 - UOIT Faculty of Engineering and Applied Science Fall...

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1 UOIT Faculty of Engineering and Applied Science Fall Semester 2007 ENGR3260U-Introduction to Energy Systems Energy and Its Importance Dr. Ibrahim Dincer Professor of Mechanical Engineering 2 OBJECTIVE ) To discuss: Í main concepts of energy, Í role of engineering, Í design aspects in energy systems and applications, Í energy use and its role in environmental impact, and Í key elements of sustainable development, life cycle assessment, industrial ecology, etc.
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3 WHAT IS ENERGY? Í Energy is often stated as power or capacity of doing work. Í Energy is classified into two: heat and work. Í Energy is defined as motion or an ability to produce motion. Í Energy is also defined as an ability to change motion or to do work. Transformation of energy into useful forms. 4 WHY ENERGY? Í Energy is vital for our life and for our economy. Examples are: ± in our homes for lighting, domestic appliances, televisions, computers, etc.; ± in factories to power the manufacture of the products we use everyday; and ± in cars, trucks, ships and aeroplanes to transport people and goods. Í Energy demand will increase significantly in the future. How then will we satisfy this huge energy requirement in an environmentally friendly way? This is the question we must answer.
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5 By the year 2050, world-wide energy demand is projected to be at least double its present level. 6 SOME QUESTIONS TO THINK ABOUT. . 3 Where do you get your electricity from? 3 What kinds of energy resources do you use? 3 How much energy does your community use? 3 Do you try to conserve energy? 3 ……. .
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FORMS OF ENERGY Í Energy manifests itself in many forms and can be converted from one form to another. The forms of energy can be classified into: 1. The macroscopic forms of energy are those related to some outside reference frame and gravitational frame such as kinetic and potential energies. 2. The microscopic forms of energy are those related to the molecular structure of a system and the molecular activity. The sum of all the microscopic forms of energy is called the internal energy of a system. Í Potential energy is stored energy. mgh Í Kinetic energy involves motion. mV 2 /2 Í The internal energy of a system depends on the properties of the materials in the system, and the environmental variables (temperature, pressure, etc.). Í Internal energy can have many forms, including, thermal (e.g. sensible and latent), chemical, nuclear, electrical, mechanical, magnetic, and surface energy. 8
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lec1 - UOIT Faculty of Engineering and Applied Science Fall...

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