DOCSLIB.ORG

Signature Redacted Author Department O>Echanical Engineering May 19, 2018

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Signature Redacted Author Department O>Echanical Engineering May 19, 2018 Low-Frequency Vibrational Energy Harvesting at the Micro and Meso Scale by Haluk Akay Bachelor of Science, Mechanical Engineering Carnegie Mellon University (2016) Submitted to the Department of Mechanical Engineering in partial fulfillment of the requirements for the degree of Master of Science in Mechanical Engineering at the Massachusetts Institute of Technology June 2018 Massachusetts Institute of Technology 2018. All rights reserved. Signature redacted Author Department o>echanical Engineering May 19, 2018 Certified by Signature redacted Sang-Gook Kim Professor of Mechanical Engineering Thesis Supervisor Accepted by Signature redacted Rohan Abeyaratne Chair, Department Committee on Graduate Theses MASSACHUSETS INSTITUTE OF TECHNOLOGY JUN 2 5 2018 LIBRARIES 2 Low-Frequency Vibrational Energy Harvesting at the Micro and Meso Scale by Haluk Akay Submitted to the Department of Mechanical Engineering on May 19, 2018 in partial fulfillment of the requirements for the degree of Master of Science in Mechanical Engineering Abstract Energy harvesting from environmentally available vibrations is a solution to providing electric power for remote and mobile applications, such as the Internet of Things. A buckled beam-based MEMS device can harvest power from low frequency, low amplitude vibrations which has never been achieved by a micro-scale device. Due to the poor fabricated quality of the active piezoelectric material in the device, however, the generated power has been an order of magnitude less than expected. It is important to harvest more than 1 micro Watt at the device size smaller than a coin in order to implement this technology for real world application. The buckled beam vibrational energy harvesting device has been evaluated for its power generation performance and its specific microfabrication recipe with respect to piezoelectric materials has been analyzed from a process control standpoint to identify areas of improvement. The process has been redesigned for a simpler and streamlined recipe. Complex residual stress control feedback loops have been replaced with a simple post-fabrication assembly to induce controlled buckling in active MEMS beams. Using a custom-designed fixture, the post-fabrication buckling concept has been demonstrated to achieve accurately buckled beams. With regard to mesoscale energy harvesting, a product has been designed that converts regular human walking motion to electricity. The device harvests electric power using air bulbs, distributed in the sole of a shoe to drive a series of micro-turbines connected to small DC motors. The number and position of air bulbs is optimized to harvest the maximum airflow from each foot-strike. The system is designed to continuously drive the micro- turbines by utilizing both outflow and inflow from the air bulbs. A prototype combat boot was fitted on the right foot of a 75kg test subject, and produced an average continuous power on the order of lOs of mW over a 22Q load during walking at 3.0 mph. This combat boot provides enough electric power to a passive GPS tracker that periodically relays geographical coordinates to a smartphone via satellite. Thesis Supervisor: Sang-Gook Kim Title: Professor of Mechanical Engineering 3 4 Acknowledgements I would like to acknowledge and thank my advisor Professor Sang-Gook Kim for his mentorship and encouragement. I also need to recognize and thank Dr. Ruize Xu, my former group-mate who preceded me on this energy harvesting project for the knowledge he lent me before graduating. I would like to thank the MTL staff, especially Dennis Ward, for their help and exceeding any expectations one could have in providing advice and help while I learned the microfabrication process. Finally, I would like to thank everyone in my personal life who are constantly helping to push me ahead. 5 6 Table of Contents Chapter 1 Introduction........................................................................................ 12 1.1 Thesis Objective.................................................................................................. 12 1.2 Thesis Organization............................................................................................ 12 Chapter 2 Low-Frequency Vibration MEMS Energy Harvesting ........................ 14 2.1 Background ........................................................................................................... 14 2.2 Device Design and Dynamic Modeling of Low Frequency Energy Harvesting............ 18 2.3 Piezoelectric Performance of Previous Generation Device ........................................ 21 2.5 Chemical Vapor Deposition Process Control.......................................................... 30 2.5.1 CVD Process Outline ........................................................................................ 31 2.5.2 Experimental Design............................................................................................ 32 2.5.3 Testing and Experimental Results ........................................................................ 34 2.5.4 Data Analysis.................................................................................................. 36 Chapter 3 Post-Fabrication Buckling Design ...................................................... 39 3.1 M otivation............................................................................................................. 39 3.2 Design Goals ......................................................................................................... 41 3.3 M odeling...............................................................................................................45 3.3.1 Analytical Buckled Beam Model ....................................................................... 45 3.3.2 Experimental Buckled Beam Model.................................................................... 49 3.4 Design Paths..........................................................................................................51 3.4.1 Achieving Buckling without Frame Modification.................................................... 52 3.4.2 Achieving Buckling by Frame Modification .......................................................... 55 3.5 Proposed Designs ................................................................................................... 56 3.5.1 Experimental Frame Bending Fixture.................................................................... 56 3.5.2 Snap-Fit Corrective Frame Fixture Design and Process ............................................ 59 3 .6 T estin g .................................................................................................................. 6 3 3.6.1 Fixture Construction ........................................................................................ 63 3.6.2 R esults ............................................................................................................. 6 6 Chapter 4 Energy Harvesting Footwear ............................................................ 71 4.1 Introduction to W earable Energy Harvesting.......................................................... 71 4.2 M esoscale Energy Harvesting System Design ............................................................ 73 4.2.1 Air Bulb Design and Placement.......................................................................... 73 4.2.2 Turbine Enclosure Geometry .............................................................................. 76 4.3 Theoretical Calculations of Upper Bound Power .................................................... 77 7 4.4 GPS - Equipped Combat Boot Prototype................................................................ 79 4 .5 R esu lts .................................................................................................................. 8 2 4.6 Discussion.............................................................................................................85 Chapter 5 Sum m ary........................................................................................... 87 5.1 Thesis Summary.....................................................................................................87 5.2 Future work ........................................................................................................... 88 Appendix A 90 A. 1 PECVD Process Capability Study Data ................................................................. 90 A.2 Electric Testing of Experimental Frame Bending Fixture......................................... 93 Bibliography 94 8 List of Figures FIGURE 2 - 2 BUCKLED BEAM ENERGY HARVESTER SCHEMATIC [1].................................................... 17 FIGURE 2 - 3 MASS-SPRING-DAMPER M ODEL SCHEMATIC ................................................................... 19 FIGURE 2 - 4 CLAMPED-CLAMPED BUCKLED BEAM ENERGY HARVESTER............................................... 20 FIGURE 2 - 5 POLARIZATION - ELECTRIC FIELD CURVE (R. Xu 2018) [1] ............................................. 23 FIGURE 2 - 6 JEON RECIPE, CRACKED PZT ........................................................................................ 26 FIGURE 2 - 7 M ITSUBISHI RECIPE, CRACKED PZT ............................................................................. 26 FIGURE 2 - 8 XRD OF ANNEALED PZT (R. Xu BASELINE RECIPE) [1]................................................. 27 FIGURE 2 - 9 POLARIZATION CURVE FROM FABRICATION WITH NEW SOL-GEL ...................................... 28 FIGURE 2 - 10 POLARIZATION OF VARIOUS
Load more

Recommended publications
  • Energy Efficiency in the Steel Industry with Emphasis on Developing Countries Public Disclosure Authorized
    WTP22 WORLD BANK TECHNICAL PAPER NUMBER 22 July 1984 Energy Efficiency in the Steel Industry with Emphasis on Developing Countries Public Disclosure Authorized Maurice Y. Meunier and Oscar de Bruyn Kops Public Disclosure Authorized _ - - '-,-.- X *C Public Disclosure Authorized i--. - e>St A-a | *>eF7tt,- -- ;---->V v Public Disclosure Authorized WORLD BANK TECHNICAL PAPERS No. 1. Increasing Agricultural Productivity No. 2. A Model for the Development of a Self-help Water Supply Program No. 3. Ventilated Improved Pit Latrines: Recent Developments in Zimbabwe No. 4. The African Typanosomiases: Methods and Concepts of Control and Eradication in Relation to Development (No. 5.) Structural Changes in World Industry: A Quantitative Analysis of Recent Developments No. 6. Laboratory Evaluation of Hand-operated Water Pumps for Use in Developing Countries No. 7. Notes on the Design and Operation of Waste Stabilization Ponds in Warm Climates of Developing Countries No. 8. Institution Building for Traffic Management (No. 9.) Meeting the Needs of the Poor for Water Supply and Waste Disposal No. 10. Appraising Poultry Enterprises for Profitability: A Manual for Investors No. 11. Opportunities for Biological Control of Agricultural Pests in Developing Countries No. 12. Water Supply and Sanitation Project Preparation Handbook: Guidelines No. 13. Water Supply and Sanitation Project Preparation Handbook: Case Studies No. 14. Water Supply and Sanitation Project Preparation Handbook: Case Study (No. 15.)Sheep and Goats in Developing Countries: Their Present and Potential Role (No. 16.)Managing Elephant Depredation in Agricultural and Forestry Projects (No. 17.)Energy Efficiency and Fuel Substitution in the Cement Industry with Emphasis on Developing Countries No.
    [Show full text]
  • World Trend of Energy Resources and Prevention of Global Warming, And
    World Trend of Energy Resource and Prevention of Global Warm- Boiler & G/T ing, and Related Development of DME Receiving Natural DME gas etc. manufac- terminal/ Fuel cell turing plant carrier storage Technologies in Mitsubishi Heavy Diesel engine Industries, Ltd. YOSHINORI OKI DME (dimethyl ether) Chain - from production to transportation, storage and effective use- ply of Primary Energy" (published in 2001) by Energy 1. Introduction Information Administration of U.S. Department of En- Mitsubishi Heavy Industries, Ltd. (MHI) considers the ergy (DOE) puts the energy demand and supply for 1990 problems of energy and global warming as the most im- through 2020 in the levels given below. portant global problems in the twenty-first century, and (1) The demand and supply for primary energy will in- is making an effort to be a leader in these fields through crease by 55%. business activities with a view to contributing to soci- (2) The demand and supply of petroleum will cover the ety. Described below are the research and development greater part of the primary energy sources, with the programs of MHI in these fields. level expected to increase by 50% (particularly 100% in Asia) in 2020 and the dependency on the Middle 2. Awareness of energy and global environmental East is to increase from 28% to 44%. problems Note: In the case of Japan, the dependency on petroleum in 2.1 Past awareness terms of primary energy source (for fiscal year 1999) As for energy problems, in collaboration with indus- was 52%, with the dependency on the Middle East be- trial, governmental and academic circles MHI has ing 86%.
    [Show full text]
  • 2010 Annual Report on Energy (Japan's “Energy White Paper 2010
    2010 Annual Report on Energy (Japan’ s “Energy White Paper 2010” ) <Outline> June, 2010 Ministry of Economy, Trade and Industry Government of Japan 2010 Energy White Paper Energy White Paper Contents The Energy White Paper is a legal white paper reported annually to the Diet Part 1 Challenges for energy and future policy following a cabinet decision based on Article 11 of the Basic Act on Energy Section 1 Country-by-country comparison through quantitative evaluation Policy. of energy security The white paper is usually made of Part 1 which sets themes and topics in Chapter 1: Responses by major consuming countries to energy security on accordance with the recent situation, analyses the policies and introduces major events trends; Part 2 which shows domestic and overseas energy trends with the use of Chapter 2: Transition of the global energy demand structure graphsand data; and Part 3 whic h lklooks bkback on the resource and energy Chap ter 3: Transition o f the energy security polic ies o f majtijor countries policies in the previous fiscal year. Chapter 4: Quantitative evaluation of comprehensive energy security Important issues in the subject fiscal year have been selected as the themes of Chapter 5: Direction of the measures for strengthening energy security in Part 1. For example, in the 2008 white paper, factors for the sharp rise in the Japan crude oil price up to 2008 were analyzed. Section 2 Trend of introduction and efforts toward the future expanded Objecti ve of the 2010 white paper (chllhallenges an dftd future poli liicies on introduction of renewable energy energy) Chapter 1: Situation of renewable energy Chapter 2: Trend of introduction of renewable energy in Japan This white paper aims to transmit information particularly on the following 2 points.
    [Show full text]
  • Estimating Historical Energy Security Costs Steve Arnold, Anil Markandya & Alistair Hunt
    No. 184/March 2009 Estimating Historical Energy Security Costs Steve Arnold, Anil Markandya & Alistair Hunt Abstract There exists a growing body of research into the Energy security is of increasing importance in costs of insecurity and the benefits from increased today’s world, yet little research has been carried security of energy, but there is much less research out on the costs or benefits of energy security available on the costs of providing the increased policies. This paper looks at the period after the security. These costs can take a number of forms, 1970s to estimate the cost premium of electricity such as increased fuel costs from sourcing secure generation due to energy security policies. The cost supplies over insecure supplies, infrastructure costs premium is estimated for France, Germany, Italy arising from developing new and more secure and Spain for the period 1980-2000 by estimating systems and processes, and the political costs of actual versus hypothetical lowest cost generation securing and protecting energy supplies. That is, mixes. The cost premium is estimated to be lowest energy policies that seek secure energy will result in for France, which had a clear energy security policy a different energy mix than policies that have sought based on developing nuclear power and reducing the cheapest energy. Comparing the two should give reliance on oil and coal. some indication of the cost of energy security policies. 1. Introduction This paper therefore attempts to measure the costs Since the oil shocks of the 1970s, energy security of the energy security policies in four European has been a concern for governments and policy- countries from 1980-2000 by comparing the makers.
    [Show full text]
  • Plant/Crop-Based Renewable Resources 2020 a Vision to E Nhance U.S
    PLANT/CROP-BASED RENEWABLE RESOURCES 2020 A VISION TO E NHANCE U.S. ECONOMIC S ECURITY T HROUGH R ENEWABLE P LANT/CROP- BASED R ESOURCE U SE About This Vision This strategic vision for the plant/crop-based renewables industry was developed by the broad U.S. agricultural, forestry, and chemical communities, with contributions from a wide range of individuals. A uniquely diverse set of American companies, nonprofit groups, trade associations, and academic institutions have come together for the first time to produce a shared vision of the future for this emerging industry. The National Corn Growers Association initiated this effort through a strategic visioning workshop held in St. Louis in December, 1996. The goal of this workshop was to start crafting an industry vision that would lead us into an era where plant/crop-based renewables could serve as comple- mentary resources to conventional feedstocks to meet our ever-growing need for chemicals, materials, and other products. This vision document broadly outlines the poten- tial reaches of this home-grown industry into the core man- ufacturing capabilities of this nation. This document is also an invitation to all readers to participate in developing the technology plans that will make the vision a reality. PLANT/CROP-BASED RENEWABLE RESOURCES 2020 TABLE OF CONTENTS 2 EXECUTIVE SUMMARY 4 INTRODUCTION What Are Plant/Crop-based Resources? The Hydrocarbon Economy 8 THE VISION FOR PLANT/CROP-BASED RENEWABLES IN 2020 9 PLANT/CROP-BASED RESOURCES AS FEEDSTOCKS: CURRENT STATUS Situation Analysis
    [Show full text]
  • U.S. Department of Energy Electricity Advisory Committee Meeting March 10, 2011
    U.S. Department of Energy Electricity Advisory Committee Meeting March 10, 2011 Meeting Minutes EAC Members in Attendance: Richard Cowart Edward Krapels Regulatory Assistance Project Anbaric Holdings CHAIR David Mohre (Representing EAC Member Barry Honorable Lauren Azar Lawson) Wisconsin Public Utilities Commission National Rural Electric Cooperative Association VICE CHAIR Ralph Masiello Guido Bartels KEMA IBM David Nevius Rick Bowen North American Electric Reliability Corporation Alcoa Irwin Popowsky Frederick Butler Pennsylvania Consumer Advocate Butler Advisory Services Wanda Reder Honorable Robert Curry S&C Electric Company New York State Public Service Commission Brad Roberts Jose Delgado Electricity Storage Association American Transmission Company (Ret.) Honorable Tom Sloan Robert Gramlich Kansas House of Representatives American Wind Energy Association Richard Vague Dian Grueneich Energy Plus Holdings, LLC Morrison and Forester LLP Gordon van Welie Michael Heyeck Independent System Operator of New England American Electric Power Mike Weedall Joseph Kelliher Bonneville Energy Administration NextEra Energy, Inc. Brian Wynne Electric Drive Transportation Association EAC Members Not in Attendance U.S. Department of Energy Attendees Ralph Cavanagh Natural Resources Defense Council Honorable Steven Koonin Under Secretary of Science Lisa Crutchfield National Grid USA Honorable Patricia Hoffman Assistant Secretary for Electricity Delivery and Roger Duncan Energy Reliability Austin Energy (Ret.) David Meyer Barry Lawson Office of Electricity
    [Show full text]
  • Untitled Document
    OUTLINE OF ENERGY POLICY 2007 - 2025 CONTENTS Chapter Description Page 1 INTRODUCTION 1 1.1 The General Context 1 1.2 Concept of Energy Policy 1 1.3 Structure of Document 3 2 BACKGROUND 4 2.1 General 4 2.2 The electricity production landscape in Mauritius 4 2.3 Electricity Demand 6 2.4 Regulatory Framework 6 2.5 Reform of the Sugar Industry 7 2.6 Environment 7 2.7 Renewable Energy 8 2.8 Hydropower 8 2.9 Bagasse 9 2.10 Solar Energy 10 2.11 Wind Energy 10 2.12 Energy from Waste 11 2.13 Energy Used in Transportation Sector 12 2.14 Biofuels 12 2.15 Energy Efficiency and Conservation 13 2.16 Summary 13 3 OBJECTIVES OF THE ENERGY POLICY 15 3.1 Principles of policy formulation 15 3.2 Vision Statement 16 3.3 Targets 16 3.4 Summary 17 4 ELEMENTS OF THE ENERGY POLICY 18 4.1 General Framework 18 4.2 Government Policy 18 4.3 Electricity Market Structure 19 4.4 Electricity Pricing for IPPs 19 4.5 Electricity from Bagasse 20 4.6 Deemed Energy/ Deemed Price 21 4.7 Electricity from Coal 21 4.8 Renewable Energy in General 22 4.9 Electricity from Wind 22 4.10 Solar Energy 22 4.11 Transport 23 4.12 Ethanol 23 4.13 Electricity from Solid (Municipal) Waste 24 4.14 Environment 24 4.15 Demand Side Management and Energy Efficiency 25 4.16 Summary 26 5 ACTION PLAN 27 5.1 General 27 5.2 Electricity generation over the period 2007 – 2011 27 5.3 Legislation 28 5.4 Detailed Energy Policy and Masterplan for Renewable Energy up to 2025 29 5.5 Summary & Conclusion 29 FOREWORD In view of the serious challenges posed by the volatility of oil prices and the rising cost of energy, Government has reviewed the energy policy for fuelling the future as a result of a paradigm shift on the world stage caused by climate change.
    [Show full text]
  • Date: I +H' April, 2014
    The Government of the Republic of the Union of Myanmar Ministry of Livestock, Fisheries and Rural Development Union Minister's Office Ref: 1 /200(N)/1+h' 040/ nA l2gzz lzAM) Date: I April, 2014 Ms. Patricia Bliss-Guest Head, CIF Administrative Unit CTF Trust Fund Committee 1818 H Street Ir{W Washington, DC 2A433, USA Subject: Expression of Interest for Scaling Up Renewable Energy Program Dear Ms. Bliss-Guest: The government of Myanmar is pleased to submit this expression of interest (EOI) for SREP funding support. Myanmar exhibits a paradox of extreme energy poverty in a land of abundant energy resources. Renewable energy (RE) resources are sufficient to meet most daily energy needs, but less than half of the total population has access to electricity. Myanmar is the largest country in mainland Southeast Asia, but has one of the lowest population densities of the region, which imposes an inherent diseconomy of scale for conventional centralized electricity grid development and expansion. Electrification varies widely between urban and rural a.reas. Less than half the population has grid-supplied electricity, and the national power grid covers only 1Vo of 65,000 villages. Considering the broad distribution of abundant RE, resources: biomass, hydropower, solar, and wind. Myanmar has an opportunity to accelerate on- and off-grid electrification with RE, delivering universal electricity access much quicker than conventional centralized generation and grid expansion. Myanmar is confronted with a number of barriers that restrain energy development in general and RE development in particular. The govemment has recognized the need for a modern legal and regulatory framework to provide transparency and certainty which 2 are prerequisites for a viable commercial energy sector.
    [Show full text]
  • Electric Power Project
    PROJECT INFORMATION DOCUMENT (PID) CONCEPT STAGE Report No.: PIDC931 Public Disclosure Authorized Project Name Electric Power Project (P143988) Region EAST ASIA AND PACIFIC Country Myanmar Public Disclosure Copy Sector(s) Thermal Power Generation (100%) Theme(s) Rural services and infrastructure (100%) Lending Instrument Specific Investment Loan Project ID P143988 Borrower(s) Ministry of Finance and Revenue Implementing Agency Ministry of Electric Power, Myanmar Electric Power Enterprise Public Disclosure Authorized Environmental B-Partial Assessment Category Date PID Prepared/ 06-May-2013 Updated Date PID Approved/ 06-May-2013 Disclosed Estimated Date of 29-Jul-2013 Appraisal Completion Estimated Date of 26-Sep-2013 Board Approval Concept Review Track II - The review did authorize the preparation to continue Public Disclosure Authorized Decision I. Introduction and Context Country Context Public Disclosure Copy Myanmar is the largest country in mainland Southeast Asia with a land area of about 654,000 square km. It is located between China, India, and Thailand, with more than 2,800 miles of coastline. This geographic advantage, and its endowed natural resources leaves it well positioned to resume its traditional role as a regional trading hub and key supplier of minerals, natural gas and electric power. Myanmar is one of the poorest countries in East Asia, with an estimated GDP per capita of between $500-800 and a poverty headcount of 26 percent. Since 2011, leaving behind decades of isolation, fragility, and conflict, Myanmar is embarking on a triple transition: from an authoritarian Public Disclosure Authorized military system to democratic governance; from a centrally directed economy to market oriented reforms; and from 60 years of conflict to peace in the border areas.
    [Show full text]
  • Project for Energy Conservation Master Plan in the Power Sector in the Sultanate of Oman
    The Sultanate of Oman Public Authority for Electricity and Water Project for Energy Conservation Master Plan in the Power Sector in the Sultanate of Oman Final Report February 2013 Japan International Cooperation Agency Tokyo Electric Power Company IL JR 13-002 Table of Contents Executive Summary Chapter 1 Introduction ............................................................................................................... 1 1.1 Background of the Study ......................................................................................................... 1 1.2 Scope and Objective of the Study ............................................................................................ 1 1.2.1 Scope of the Study ............................................................................................................ 1 1.2.2 Objective .......................................................................................................................... 1 1.2.3 Scope of Work .................................................................................................................. 2 1.3 Implementation Schedule ........................................................................................................ 3 1.3.1 Work Flow of the Study .................................................................................................... 3 1.3.2 Work Schedule .................................................................................................................. 5 1.4 Study Team Structure .............................................................................................................
    [Show full text]
  • Japan Energy Conservation Handbook 2011
    Japan Energy Conservation Handbook 2011 The Energy Conservation Center, Japan CONTENTS 1. ENERGY SITUATION................................................................................1 1.1 World Energy Situation ................................................................................................. 1 1.2 Japan’s Energy Situation............................................................................................... 1 2. ENERGY CONSERVATION POLICIES AND LAWS IN JAPAN..........4 2.1 Outline of Energy Conservation Policies...................................................................... 4 (1) Brief history of energy conservation policies in Japan (2) Promotion of energy conservation measures 2.2 Basic Energy Plan........................................................................................................... 5 (1) Industrial sector (2) Residential sector (3) Business sector (4) Transportation sector (5) Cross-cutting measures 2.3 National Strategies and Plans........................................................................................ 6 (1) New National Energy Strategy (2) Energy Conservation Frontrunner Plan (3) Energy Conservation Technology Strategy 2.4 Law Concerning the Rational Use of Energy............................................................... 8 (1) Objective (2) Energy defined by the law (3) Basic policies and obligations of energy users (4) Measures for factories etc. (5) Measures for buildings (6) Measures for equipment (7) Measures for transportation (8) Amendment of the law
    [Show full text]
  • Power and Coal Subsector Review
    Report No. 4746b-HU Hungary Powerand Coal SubsectorReview o-dLEto Public Disclosure Authorized October 4, 1984 Projects Department Europe,Middle Eastand North Africa Regional Office FOR OFFICIAL USE ONLY Public Disclosure Authorized Public Disclosure Authorized Document of the World Bank Public Disclosure Authorized This document has a restricted distribution and may be used by recipients only in the performance of their official duties. Its contents may not otherwise be disclosed without World Bank authorization. CURRENCY EQUIVALENTS (as of May, 1983) Currency unit = Forint (Ft) Official rate 1T7'orint (Ft 1) = US$0.025 Ft 40 = US$1.00 WEIGHTS AND MEASURES 1 kilowatt (kW) = 1,000 watts (103 W) 1 Megawatt (MW) = 1,000 kilowatts (103 kW) 1 Gigawatt (GW) = 1 million kilowatts (106kW) 1 kilowatt-hour (kWh) = 1,000 watt-hours (103 Wh) 1 Megawatt-hour (MWh) = 1,000 kWh (10 3 kWh) 1 Gigawatt-hour (GWh) = 1,000,000 kWh (106 kWh) 1 Terawatt-hour (TWh) = 1,000 million kWh (lO9kWh) 1 kilovolt (kV) = 1,000 volt (103V) 1 kilovolt-ampere (kVA) = 1,000 volt-amperes (103 VA) 1 Megavolt-ampere (MVA) = 1,000 kilovolt-amperes (103 kVA) 1 kilocalorie (kcal) = 3.968 British thermal units (Btu) = 4.1868 kilojoules (kJ) 1 kilojoule (kJ) = 0.2388 kilocalorie (kcal) 1 Megajoule (MJ) = 1,000 kilojoules 10 3 kJ) 1 Gigajoule (GJ) = 1,000,000 kilojoules (106 kJ) 1 Terajoule (TJ) = 1,000 million kilojoules (109 kJ) 1 Petajoule (PJ) = 1,000,000 million kilojoules (l012 kJ) 1 tonne of oil equivalent (toe) = 10,200,000 kilocalories = 42.7 Gigajoules 1 Hertz (unit of frequency) (Hz) = 1 cycle per second I bar (unit of pressure) = 14.5 lbs per sq.
    [Show full text]