...CHAPTER-1 INTRODUCTION 1.1 INTRODUCTION TO SOLAR ENERGY Fig. 1.1(a) Block Diagram of Photovoltaic System Renewable energy is rapidly gaining importance as an energy resource as fossil fuel prices fluctuate. At the educational level, it is therefore critical for engineering and technology students to have an understanding and appreciation of the technologies associated with renewable energy. One of the most popular renewable energy sources is solar energy. Many researches were conducted to develop some methods to increase the efficiency of Photo Voltaic systems (solar panels). One such method is to employ a solar panel tracking system. This project deals with a microcontroller based solar panel is always able to maintain a perpendicular profile to the sun’s rays. Development of solar panel tracking systems has been ongoing for several years now. As the sun moves across the sky during the day, it is advantageous to have the solar panels track the location of the sun, such that the panels are always perpendicular to the solar energy radiated by the sun. This will tend to maximize the amount of power absorbed by the PV systems. It has been estimated that the use of a tracking system, over a fixed system, can increase the power output by 30%-60%. The increase is significant enough to make tracking a viable preposition despite of the enhancement in system cost. It is possible to align the tracking heliostat normal to sun using electronic...
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...PANDE et Sébastien DANIERE How to produce electricity with solar energy? Renewable energy If our energy for the future only depended from the sun How to produce electricity with solar energy? -1- How to produce electricity with solar energy? Summary INTRODUCTION………………………………………………………………………………………………. 3 I) CURRENT SOLAR PHOTOVOLTAIC (PV) TECHNOLOGIES (by Sui CHEN) a) b) c) d) e) Preface………………………………………………………………………………………………………. 4 Solar energy map ……………………………………………………………………………………… 4 The cell basic construction………………………………………………………………………. 5 Material of photovoltaic cell ………………………………………………………………….... 6 Array design and sun tracking………………………………………………………………….. 7 II) SOLAR PANEL FOR BUILDING (by Rahul KAPADIA) a) b) c) d) e) f) g) h) i) Preface…………………………………………………………………………………......................... 9 Overview……………………………………………………………………………………………………. 9 Why are solar panels important……………………………………………………………….. 9 Solar panel arrays…………………………………………………………………………………….. 10 Account of daily producing power......................................................................... 10 Solar panel installation……………………………………………………………………………… 11 Precautions………………………………………………………………………………………………. 11 Battery system for solar panel……………………………………………………………………. 11 How many solar panels to recharge the battery…………………………………………... 12 III) APPLICATION OF SOLAR ELECTRICITY FOR COMMERCIAL BUILDING (by Geeta PANDE) a) Application of solar energy for rural electrification………………………………...
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...little maintenance. The use of a widely available and reasonably reliable fuel source—the sun—with no associated storage or transportation difficulties and no emissions makes this technology eminently practicable for powering remote scientific research platforms. Indeed, numerous examples of successfully deployed systems are already available. The completely scaleable nature of the technology also lends itself well to varying power requirements–from the smallest autonomous research platforms to infrastructure-based systems. This technology can be limited, however, by annual fluctuations in solar insolation, especially at extreme latitudes. Based on semiconductor technology, solar cells operate on the principle that electricity will flow between two semiconductors when they are put into contact with each other and exposed to light (photons). This phenomenon, known as the photovoltaic effect, was first discovered by Edmund Becquerel in 1839. Actual development of PV technology began in the 1950s and gained greater impetus through the NASA space program during the 1960s. Research continues today at national laboratories and within private industry, focusing on increasing conversion efficiencies and mass production strategies to further lower the cost of producing PV modules. For a list of some of the many online resources on PV technology visit the Links Section of http:// polarpower.org. The same web site offers presentations from the 2004 Renewable Energy Working Group Meeting...
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...Solar Cell Technology and Applications More free ebooks : http://fast-file.blogspot.com OTHER AUERBACH PUBLICATIONS Advances in Semantic Media Adaptation and Personalization, Volume 2 Marios Angelides ISBN: 978-1-4200-7664-6 Architecting Secure Software Systems Manish Chaitanya and Asoke Talukder ISBN: 978-1-4200-8784-0 Architecting Software Intensive Systems: A Practitioners Guide Anthony Lattanze ISBN: 978-1-4200-4569-7 Business Resumption Planning, Second Edition Leo Wrobel ISBN: 978-0-8493-1459-9 Converging NGN Wireline and Mobile 3G Networks with IMS: Converging NGN and 3G Mobile Rebecca Copeland ISBN: 978-0-8493-9250-4 Delivering Successful Projects with TSPSM and Six Sigma: A Practical Guide to Implementing Team Software ProcessSM Mukesh Jain ISBN: 978-1-4200-6143-7 Designing Complex Systems: Foundations of Design in the Functional Domain Erik Aslaksen ISBN: 978-1-4200-8753-6 The Effective CIO: How to Achieve Outstanding Success through Strategic Alignment, Financial Management, and IT Governance Eric Brown and William Yarberry, Jr. ISBN: 978-1-4200-6460-5 Enterprise Systems Backup and Recovery: A Corporate Insurance Policy Preston Guise ISBN: 978-1-4200-7639-4 Essential Software Testing: A Use-Case Approach Greg Fournier ISBN: 978-1-4200-8981-3 The Green and Virtual Data Center Greg Schulz ISBN: 978-1-4200-8666-9 How to Complete a Risk Assessment in 5 Days or Less Thomas Peltier ISBN: 978-1-4200-6275-5 HOWTO Secure and Audit Oracle 10g and 11g Ron Ben-Natan ISBN:...
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...Converting sunlight into other forms of energy: Using photovoltaic cells made from silicon alloys for solar power Author(s): Robert A. Lucking, Edwin P. Christmann and Robin Spruce Source: Science Scope, Vol. 34, No. 4, Elements, Compounds, and Mixtures (DECEMBER 2010), pp. 52-55 Published by: National Science Teachers Association Stable URL: http://www.jstor.org/stable/43182959 Accessed: 21-04-2016 08:54 UTC Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at http://about.jstor.org/terms JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. National Science Teachers Association is collaborating with JSTOR to digitize, preserve and extend access to Science Scope This content downloaded from 103.4.92.54 on Thu, 21 Apr 2016 08:54:57 UTC All use subject to http://about.jstor.org/terms ^mSÜtrek Converting sunlight into other forms of energy: Using photovoltaic cells made from silicon alloys for solar power by Robert A. Lucking, Edwin P. Christmann, and Robin Spruce Photovoltaic cells may one day surround our ence curriculum springs from new concerns about how we power our homes and businessThe es ence about and role curriculumandop...
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...PUBLISHED ONLINE: 18 MAY 2015 | DOI: 10.1038/NNANO.2015.89 Black silicon solar cells with interdigitated back-contacts achieve 22.1% efficiency Hele Savin1*, Päivikki Repo1, Guillaume von Gastrow1, Pablo Ortega2, Eric Calle2, Moises Garín2 and Ramon Alcubilla2 The nanostructuring of silicon surfaces—known as black silicon—is a promising approach to eliminate front-surface reflection in photovoltaic devices without the need for a conventional antireflection coating. This might lead to both an increase in efficiency and a reduction in the manufacturing costs of solar cells. However, all previous attempts to integrate black silicon into solar cells have resulted in cell efficiencies well below 20% due to the increased charge carrier recombination at the nanostructured surface. Here, we show that a conformal alumina film can solve the issue of surface recombination in black silicon solar cells by providing excellent chemical and electrical passivation. We demonstrate that efficiencies above 22% can be reached, even in thick interdigitated back-contacted cells, where carrier transport is very sensitive to front surface passivation. This means that the surface recombination issue has truly been solved and black silicon solar cells have real potential for industrial production. Furthermore, we show that the use of black silicon can result in a 3% increase in daily energy production when compared with a reference cell with the same efficiency, due to its better angular acceptance. ...
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...GCSE Physics Revision notes 2014 Contents Static and Current Electricity .............................................................................................................. 2 Properties of Waves ........................................................................................................................... 12 Uses of Waves..................................................................................................................................... 13 Forces, Moments and Pressure......................................................................................................... 14 Energy Transfers................................................................................................................................. 17 Energy Calculations ............................................................................................................................ 20 Radioactivity ........................................................................................................................................ 22 Magnetism and Electromagnetism ................................................................................................... 24 Space .................................................................................................................................................... 27 These notes cover the main areas of this subject. Please check the specific areas you need with your exam board. They are...
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...*Physics Prelims (1-7).qxd 12/11/08 1:00 PM Page 1 SCIENCE VISUAL RESOURCES PHYSICS An Illustrated Guide to Science The Diagram Group *Physics Prelims (1-7).qxd 12/11/08 1:00 PM Page 2 Physics: An Illustrated Guide to Science Copyright © 2006 The Diagram Group Author: Derek McMonagle BSc PhD CSci CChem FRSC Editors: Catherine Gaunt, Jamie Stokes Design: Anthony Atherton, Richard Hummerstone, Lee Lawrence, Tim Noel-Johnson, Phil Richardson Illustration: Peter Wilkinson Picture research: Neil McKenna Indexer: Martin Hargreaves All rights reserved. No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage or retrieval systems, without permission in writing from the publisher. For information contact: Chelsea House An imprint of Infobase Publishing 132 West 31st Street New York NY 10001 For Library of Congress Cataloging-in-Publication Data, please contact the Publisher ISBN 0-8160-6167-X Chelsea House books are available at special discounts when purchased in bulk quantities for businesses, associations, institutions, or sales promotions. Please call our Special Sales Department in New York at 212/967-8800 or 800/322-8755. You can find Chelsea House on the World Wide Web at http://www.chelseahouse.com Printed in China CP Diagram 10 9 8 7 6 5 4 3 2 This book is printed on acid-free paper. *Physics Prelims (1-7).qxd 12/11/08 1:00 PM Page...
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...Chapter 01 1.1 Introduction: A storage device may be used to store energy from renewable energy source in DC form which can be converted to AC power by using power inverter. Pulse Width Modulated (PWM) technique may be used to control output rms voltage of the inverter. As the load is variable, the power consumed by the load (PL) may be smaller than the power generated from the renewable energy source (PR). Therefore a Flexible AC Transmission System (FACTS) Controller may be used to supply the additional power (PR – PL) from the renewable energy source to the grid. On the other hand if the power consumed by the load (PL) is greater than the power generated from the renewable energy source (PR) therefore the same FACTS controller may be used to absorb the additional power (PR – PL) from the grid to the load. In this case the FACTS controller must allow bi-directional power flow. If all the active houses are connected to the grid in the same way (proposed way), the active houses that generate more power than the load can be supplied to the active houses that generate less power than the load. Therefore a suitable FACTS controller should be designed in such a way that it can control the power flow in both directions. The idea is illustrated in the following figure. 1.2 Objectives: • Study on different FACTS controllers • Study on different renewable energy sources • Study on different...
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...ME3281 Microsystems Design and Applications TERM PAPER DEPARTMENT OF MECHANICAL ENGINEERING MEMS Energy Harvesters LIM HUI HUA ALVINA A0083044M 2014 Table of Contents 1. Introduction: 2 2. Brief History of Electricity Transduction 2 3. Types of Micro Energy Harvesters 3 3.1 Energy Harvesting from Vibration 3 3.1.1 Fabrication Techniques 5 3.1.2 Applications, Challenges and the Future 6 3.2 Energy Harvesting from Thermal Sources 6 3.2.1 Fabrication Techniques 8 3.2.2 Applications, Challenges and the Future. 9 3.3 Energy Harvesting from Electromagnetic Waves 10 3.3.1 Applications, Challenges and the Future 11 3.4 Energy Harvesting from Light Sources 11 3.4.1 Fabrication 12 3.4.2 Applications, Challenges and the Future 13 4. Conclusion 13 References: 14 1. Introduction: One of the goals of engineers and scientists in this already tech-savvy age is to be able to design a device that is capable of powering itself for its lifetime without having to replace or recharge its battery using a power chord. These allow remote devices to be placed in hostile or inaccessible environments without requiring any or little maintenance such as the changing of batteries. This is especially applicable for silicon-based electronics, such as biomedical implants that have low power consumption, where batteries will largely affect its size; operational cost of the device, or perhaps even release harmful chemicals into the body. In addition, wireless sensor...
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...Technical Interview Questions for Instrumentation Engineering 1. For what purpose Pirani gauge is used? Ans. Low pressure measurement. 2. Psi stands for ____? Ans. Pounds per square inch. 3. Low pressure is expressed in ________? Ans. Torr. 4. What is the disadvantage of orifice meter & why they are preferred in the industries? Ans. It gives a permanent pressure loss but due to their low cost they are preferred in the industries. 5. Bolometer is used as ________? Ans. Radiation detector. 6. Stroboscope is used for the measurement of____? Ans. Angular velocity. 7. Electromagnetic flow meter is not suitable for which kind of fluids? Ans. Non conductive fluids. 8. What is measurement? Ans. It is an act of comparison between the unknown quantity and the standard resulting in knowing the magnitude of the unknown quantity in terms of the standard being used for the purpose of comparison. 9. What is an instrument? Ans. It facilitates this process of comparison. 10. What is the difference between accuracy & precision? Ans. Accuracy: it is the degree of closeness with which an instrumentation reading approaches to the true value of the quantity being measured. Precision: it is a measure of reproducibility. 11. What is an embedded system? Ans. A microcontroller based system designed for a specific task. 12. What are the various criteria of choosing of microcontroller? Ans. memory, power consumption, packaging, market availability, speed of operation. 13. H-bridge is used for? Ans. For...
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...Internship Report Submitted By: Poulami Dey MBA/June-July/2010 Semester 4th Roll no.: 50 Enrolment No: EIILMU/09/ F0741 Project A PROJECT REPORT ON CURRENT MARKET SENARIO AND FUTUREPROSPECT FOR SOLAR LAMPS AND LED PRODUCTS AT BAJAJ ELECTRICALS LTD Company ACKNOWLADGEMENT My summer internship or training with Bajaj Electricals Ltd is a life time experience that I will cherish throughout my carrier .This project has provided a great opportunity to experience the excellent and modern work culture and work process of Bajaj Electrical Ltd. I wish to thank my respective project guide at the organisation Mr. Kalyan Bhattacharya. His guidance was extremely useful throughout my project work in giving me the detailed understanding of the entire product portfolio and the overall industry overview. I would also wish to thank all the distributers and group of dealers who shared their extremely important time to equip me with the important and valuable organizational insights and helping me to prepare the project. Along with the corresponding people at the organisation, I am sincerely thankful to our internal guide Prof, Anirban Dutta, who has helped me with the adequate academic insight whenever it was required. I wish to give my warm regards to all the persons involved in the timely completion of my project, directly or indirectly. I would like...
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...Physics PHYSICS FORMULAE AND PRINCIPLES Fundamental quantities and SI units The standard units were set up by the international system of units, SI The fundamental quantities, there symbols and there SI units a listed below Quantity symbol SI unit & unit symbol Length l metre (m) Mass m kilogram (k g) Time t second (s) Temperature T Kelvin (k) Current I Ampere (A) Amt. substance mol mole 6.02 x 10 23 (molecules) Luminous intensity - candela (c d) MULTIPLES AND SUBMULTIPLES Multiples are larger than the base units and submultiples are smaller than the base units Multiples Symbol Prefix Meaning Example Deca d 10 1 0 Decameter Hecto h 102 100 Hectometer ...
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...GERMANY 2011 Solar cell generations over 40% efficiency R. R. King*, D. Bhusari, D. Larrabee, X.-Q. Liu, E. Rehder, K. Edmondson, H. Cotal, R. K. Jones, J. H. Ermer, C. M. Fetzer, D. C. Law and N. H. Karam Spectrolab, Inc., 12500 Gladstone Ave, Sylmar, CA 91342, USA ABSTRACT Multijunction III-V concentrator cells of several different types have demonstrated solar conversion efficiency over 40% since 2006, and represent the only third-generation photovoltaic technology to enter commercial power generation markets so far. The next stage of solar cell efficiency improvement, from 40% to 50%-efficient production cells, is perhaps the most important yet, since it is in this range that concentrator photovoltaic (CPV) systems can become the lowest cost option for solar electricity, competing with conventional power generation without government subsidies. The impact of 40% and 50% cell efficiency on cost-effective geographic regions for CPV systems is calculated in the continental US, Europe, and North Africa. We take a systematic look at a progression of multijunction cell architectures that will take us up to 50% efficiency, using modeling grounded in well-characterized solar cell materials systems of today’s 40% cells, discussing the theoretical, materials science, and manufacturing considerations for the most promising approaches. The effects of varying solar spectrum and current balance on energy production in 4-junction, 5-junction, and 6-junction terrestrial concentrator cells are shown...
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...transferred from one form to another form. Not all of the energy transferred by a device is useful energy. Potential energy is stored energy. All energy will eventually spread out to the surroundings as heat. Sample question 1 Sankey diagrams and efficiency Sample sankey diagram for a light bulb Sankey diagrams are ways of representing the different energy transformations that take place in different electrical devices. The start of the sankey diagram shows the total energy going into the device. The diagram then splits off into different sized arrows to represent the other energy transfers that take place, the bigger the arrow the larger the energy. The energy entering the device must equal the energy leaving the device. To know how good a device is at transferring energy you need to be able to calculate the efficiency. To do that you need to use the following equation (which will be given in the exam) OR So for the above example the answer would be Efficiency= 10100=0.1 The closer the efficiency is to 1 the more useful energy the device is transferring. So for the light bulb example we got an efficiency of 0.1, so the light bulb isn’t very good and transferring useful energy. Sample question 2 Kinetic theory Most matter or substances can be classed as being solids, liquids or gases. Solids: They have the least amount of energy are arranged in a pattern. They vibrate around fixed positions Liquids: The particles are closely packed together...
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