Edit Proposal: Milestone-Proposal:Inverter-driven residential air conditioner 1981 You do not have permission to edit this page, for the following reason: You are not currently logged in. The action you have requested is limited to users in the group: Users. Please log in or create an account. Docket ID: (admins only) Thank you for proposing a technical achievement for possible recognition as an IEEE Milestone in Electrical Engineering and Computing. Your efforts help preserve the heritage of technology. Detailed information on the Milestone application process may be found at: Milestone Guidelines and How to Propose a Milestone. At least one of the proposer(s) must be an IEEE Member (including Student Member) in good standing. To the proposer’s knowledge, is this achievement subject to litigation? If the answer is "yes", the proposal cannot proceed further. Yes No You must be able to answer "yes" to all of the following questions. If the answer to any of the following questions is "no", the proposal cannot proceed further. Contact us at email@example.com if you are unable to answer "yes" to all of the following and would still like to proceed. Is the achievement you are proposing more than 25 years old? Yes No Is the achievement you are proposing within IEEE’s designated fields as defined by IEEE Bylaw I-104.11, namely: Engineering, Computer Sciences and Information Technology, Physical Sciences, Biological and Medical Sciences, Mathematics, Technical Communications, Education, Management, and Law and Policy. Yes No Did the achievement provide a meaningful benefit for humanity? Yes No Was it of at least regional importance? Yes No Has an IEEE Organizational Unit agreed to pay for the milestone plaque(s)? Yes No Has an IEEE Organizational Unit agreed to arrange the dedication ceremony? Yes No Has the IEEE Section in which the milestone is located agreed to take responsibility for the plaque after it is dedicated? Yes No Has the owner of the site given permission to place an IEEE plaque? Yes No Year or range of years in which the achievement occurred: Title of the proposed milestone. (Include date or date range in title. Example: “Alternating Current Electrification, 1886”) Please provide a plaque citation in English summarizing the achievement and its significance. Text absolutely limited by plaque dimensions to 70 words; 60 is preferable for aesthetic reasons. NOTE: The IEEE History Committee shall have final determination on the wording of the citation. Names of living persons are not normally used in citations. Exceptions to this are cases where the person's name is linked to the achievement itself (e.g. the Lempel-Ziv algorithm, Maxwell's Equations, etc.) or where the person's name is so widely recognizeable to the general public that it makes sense to use it. When used, the names should be the names of the engineers, scientists, or technologists who actually made the achievement, rather than managers or executives. For more information and suggestions about writing milestone citations, please visit Helpful Hints on Citations, Plaque Locations. Toshiba developed and mass-produced the world first inverter split air conditioners for commercial and residential applications in 1980 and 1981, respectively. Downsized and robust inverters using power electronics technologies allowed variable-speed control of the compressor for optimized air-conditioning operations with significantly improved comfort and energy efficiency. The inverter air conditioner has witnessed its rising penetration across the world. In what IEEE section(s) will the milestone plaque(s) reside? Please specify the IEEE Organizational Unit(s) which have agreed to sponsor the Milestone, and supply name and contact information for the senior officer from those OU(s). Sponsorship has three aspects: 1) Payment for the cost of the plaque(s), 2) Arranging the dedication ceremony, and 3) agreeing to monitor the plaque and to let IEEE History Center staff know in case the plaque needs to be moved, is no longer secure, etc. Number 3 must be done by the IEEE Section(s) in which the plaque(s) is located, but aspects 1 and 2 can be done by any IEEE Organizational Unit, and they need not be the same one. Please note: your email address and contact information will be masked on the website for privacy reasons. Only IEEE History Center Staff will be able to view the email address. IEEE Organizational Unit(s) paying for milestone plaque(s) Unit: Senior Officer Name: E-mail: Unit: Senior Officer Name: E-mail: IEEE Organizational Unit(s) arranging the dedication ceremony Unit: Senior Officer Name: E-mail: Unit: Senior Officer Name: E-mail: IEEE section(s) monitoring the plaque IEEE Section: IEEE Section Chair name: IEEE Section Chair e-mail: IEEE Section: IEEE Section Chair name: IEEE Section Chair e-mail: Milestone proposer(s) Proposer name: Proposer email: Proposer name: Proposer email: Street address(es) and GPS coordinates of the intended milestone plaque site(s). Please include coordinates in decimal format rather than degrees. What is the intended site(s) of the milestone plaque(s) relation to the achievement? The intended site(s) must have a direct connection with the achievement (e.g. where developed, invented, tested, demonstrated, installed, or operated, etc.). A museum where a device or example of the technology is displayed, or the university where the inventor studied, are not, in themselves, sufficient connection for a milestone plaque. Also, please Describe briefly the intended site(s) of the milestone plaque(s). (e.g. Is it corporate buildings? Historic Site? Residential? Are there other historical markers already at the site?) Are the original buildings extant? Please provide the details of the mounting, i.e. on the outside of the building, in the ground floor entrance hall, on a plinth on the grounds, etc. How is the intended plaque site protected/secured, and in what ways is it accessible to the public? If visitors to the plaque site will need to go through security, or make an appointment, please give details as well as the contact information visitors will need in order to arrange to visit the plaque. Who is the present owner of the site(s)? In the space below, please describe in detail: the historic significance of the achievement, its importance to the evolution of electrical and computer engineering and science, its importance to regional/national/international development, its benefits to humanity, the ways the achievement was a significant advance rather than an incremental improvement of existing technology. The material submitted here will constitute the main descriptive article on the ETHW website for readers to learn about the milestone. Space is unlimited, and detail is encouraged. Most milestones require 1000 to 1500 words of support, however there is no word limit. The article should be readable by a wide audience that includes practicing engineers, scholars of history, and the general public. Some examples of the text of good milestone articles are First Radio Astronomical Observations Using Very Long Baseline Interferometry] and G3_Facsimile International Standardization of G3 Facsimile (Do not worry about the formatting of the page, IEEE History Center Staff will do that afterwards.) What is the historical significance of the work (its technological, scientific, or social importance)? The achievement is about the world first inverter split air conditioners developed and commercialized by Tokyo Shibaura Electric Co., Ltd. or Toshiba, as known as Toshiba Carrier Corporation today. Toshiba manufactured 100 units and 10,997 units for commercial and residential use, respectively, during the first year after the product launch in Japan in 1980 and 1981, respectively. The use of inverter has allowed an optimal control over the rotation speed of the compressor used for the inverter air conditioner according to the load required. With its significant benefits to humanity, including improved comfort and energy efficiency, the achievement led to a remarkable evolution in the air conditioning technological history. The technologies used for the achievement, including drive control and downsizing, were also instrumental in promoting innovation of other various inverter-driven home appliances such as refrigerators and washing machines. The inverter air conditioner, whose origin is Japan, is nowadays widely used throughout the world and is considered to have become the global standard of air conditioners. What obstacles (technical, political, geographic) needed to be overcome? There are three major technical obstacles that needed to be overcome: (i) Breaks and wears caused in compressors and cycle parts such as valves due to the change in compressor operation from a fixed speed to variable speeds. (ii) Decrease in the oil level in the compressor as a part of the refrigeration cycle and vibration of the pipes resulting from variable speed operation (iii) Development of the drive circuit for inverter’s power transistor and the microprocessor-controlled sinusoidal pulse with modulation Through the efforts of engineers at Toshiba to overcome these obstacles with their technical expertise, assure reliability through technology development, and also attain downsizing and lower costs, the achievement was accomplished in a successful manner. What features set this work apart from similar achievements? Some attempts were made in around 1980 to adopt inverter technologies in the social infrastructure field such as train systems for variable speed drive motor control and chiller systems, in which chilled water is created, as seen in the case developed in 1977 by York, which retrofitted an external inverter unit for chiller units already in operation. The achievement by Toshiba (i.e. inverter air conditioner split type) is a totally different system from the chiller system in terms of the product categories in the following points: (i) The split inverter air conditioning system consists of an indoor unit and an outdoor unit; heat transfer between the indoor unit and outdoor unit is made through refrigerant for cooling and heating operations. (ii) Toshiba’s inverter unit mounted inside the air conditioner is significantly smaller than York’s inverter unit installed on the floor separately from the chiller unit. Supporting texts and citations to establish the dates, location, and importance of the achievement. You must supply the texts or excerpts themselves, not just the references. Minimum of five (5), but as many as needed to support the milestone, such as patents, contemporary newspaper articles, journal articles, or chapters in scholarly books. At least one of the references must be from a scholarly book or journal article. 'Scholarly' is defined as peer-reviewed, with references, and published. The full reference, in English, must be uploaded, not just the citation. See below section for details on uploading material to the website. All supporting materials must be in English, or accompanied by an English translation. File name; 0_List of IEEE Milestone proposal support materials.pdf Summery; List of IEEE Milestone proposal support materials File name; 1_The Journal of the IEEJ, Vol 129-2.pdf Summery; Toshiba launched its inverter air conditioners for commercial use and residential use in December 1980 and December 1981, respectively. File name; 2_REFRIGERATION, June 1981 Vol. 56, No. 644.pdf Summery; Toshiba is the first manufacturer that achieved the development and commercialization of a commercial air conditioner serving both cooling and heating purposes with a built-in unit of inverter and a variable-speed compressor (Custom Air Conditioner RAV-46HT), resulting in a significant improvement in energy efficiency and comfort. File name; 3_US Department of Energy.pdf Summery; Benefits of Capacity Modulation on Seasonal Efficiency for Heat Pumps, Impact of foreign competition, Overview, First Inverter-driven Heat Pump, Conclusions File name; 4_Air Conditioning, Heating & Refrigeration News.pdf Summery; Cost of controls and the development time required have eliminated it from further consideration in this study, although the costs are dropping rapidly with new technology with may make this approach more viable in the near future. File name; 5_Toshiba Review Vol. 36, No. 9.pdf Summery; In recent years, the industry has come to make efforts to develop compressors and air conditioners driven by inverters. Taking the lead in the world, Toshiba has succeeded in practicalizing this type of air conditioners(RAV-46HT); the new products have been put on sale since last December. File name; 6_Toshiba Review Vol. 37, No. 7.pdf Summery; A new type of airconditioner incorporating a variable-capacity-control inverter to improve energy saving and comfort has been developed as a pioneer for domestic use. File name; 7_World AC Market & Inverter Ratio.pdf Summery; World AC Market & Inverter Ratio Supporting materials (supported formats: GIF, JPEG, PNG, PDF, DOC) which can be made publicly available on the IEEE History Center’s website (i.e. unencumbered by copyright, or with the copyright holder’s permission). All supporting materials must be in English, or if not in English, accompanied by an English translation. You must supply the texts or excerpts themselves, not just the references. Images and photographs are especially appreciated, however, it is necessary that you list the copyright owner for these and obtain the copyright owner’s permission to reuse. For documents that are copyright-encumbered, or which you do not have rights to post, email the documents themselves to firstname.lastname@example.org. Please see the Milestone Program Guidelines for more information. To add attachments, first upload the file and add by adding the text [[Media:(filename)]] - if the file you uploaded was named "Milestone Reference.pdf", include the text [[Media:Milestone Reference.pdf]] in the appropriate field. File name; RAS-225PKHV.jpg Summery; Photo of World First Inverter Air conditioner Split type for Residential use File name; RAS-225PKHV Inverter.jpg Summery; Photo of Inverter Unit Please email a jpeg or PDF a letter in English, or with English translation, from the site owner(s) giving permission to place IEEE milestone plaque on the property, and a letter (or forwarded email) from the appropriate Section Chair supporting the Milestone application to email@example.com with the subject line "Attention: Milestone Administrator." Note that there are multiple texts of the letter depending on whether an IEEE organizational unit other than the section will be paying for the plaque(s). Submit this proposal to the IEEE History Committee for review. Only check this when the proposal is finished Summary: This is a minor edit Watch this page Cancel Retrieved from "http://ieeemilestones.ethw.org/Milestone-Proposal:Inverter-driven_residential_air_conditioner_1981"