Milestone-Proposal talk:Inverter-driven residential air conditioner 1981

It is a really groundbreaking innovation in air-conditioner development history. The inverter air conditioner is nowadays widely used throughout the world and become the global standard of air conditioners. It has a big impact. -- Xdh (talk) 04:13, 12 June 2020 (UTC)

I am glad to be a reviewer for the proposal to milestone-proposal titled on Inverter driven residential air conditioner 1981. It is a really groundbreaking innovation in air-conditioner development history. The inverter air conditioner is nowadays widely used throughout the world and become the global standard of air conditioners. It is a great impact on both energy efficiency and environmental protection. Firstly the Plaque Citation is accurate to represent the novelty of the invention. Toshiba is firstly to embed the inverter into the air-conditioner by miniaturizing the inverter size. Secondarily the milestone well supported by the documents. One of the important pieces of evidence is paper titled on " Capacity Control with Frequency Modulation System", Japanese Association of Refrigeration in 1981. It reported the progress on inverter modulation controller the air-conditioners by Tokyo Shibaura Electric Co., Ltd. Toshiba commercialized the inverter-driven residential air-conditioner in 1980. It can be found in the Toshiba Science Museum. The contribution has been recognized in Japan with the Ichimura Prize in Industry in 1984 and Award of the Institute of Electrical Engineers of Japan in 2008. To solve the energy-inefficient problem of on-off control of the conventional air-conditioner. Toshiba leverage power transistor and microprocessor and sinusoidal pulse width modulation control and achieved a significant downsizing in its inverters. A downsizing inverter is critical to residential products. The energy efficiency of the inverter residential air conditioners reached a 40% improvement to the conventional fixed-speed ones. On technically, they solved the power circuit design and microprocessor PWM control issue. Besides, there are challenges of the mechanical issues due to the transition from the fixed speed to variable speed. Toshiba finally successfully overcome these obstacles with their technical expertise and obtain downsizing and lower costs inverter-driven residential air conditioners in 1981.

Mr. Enrique Tejera, we would like to express once again a sincere gratitude for your support as Advocate during our Milestone process. Professors Xu and Akagi, we are very much honored to have you as reviewers and are grateful for your strong support on our submittal.

We studied internally Professor Akagi’s comment “it would be much better if the term "conditioner" would be replaced with "conditioners," and revised the title of the proposed milestone as follows: Inverter Air Conditioners, 1980-81

The expression of “Split Type” is dropped in the revised title to avoid redundancy and awkwardness, as the feature of the “Split” is included in the plaque citation text.

In addition, we checked our plaque citation text and confirmed that the term “conditioner” in our original submittal is used in the plural form, as suggested by Professor Akagi.

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, and as a result led to a widespread use of inverter air conditioners across the world.

Also, please be noted that the title of this Milestone Proposal is NOT “Inverter-driven residential air conditioner 1981” as shown on the top of this thread, BUT “Inverter Air Conditioners, 1980-81”, as it has been changed it from the original entry before having completed the submittal. We apologize for causing confusion.