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成果報告書詳細
管理番号20170000000370
タイトル*平成28年度中間年報 高効率低GWP冷媒を使用した中小型空調機器技術の開発 低温室効果冷媒の性能、安全性評価 低GWP冷媒を用いた空調機器の性能および安全性評価
公開日2017/6/7
報告書年度2016 - 2016
委託先名国立大学法人東京大学
プロジェクト番号P16004
部署名環境部
和文要約
英文要約 In this research in order to achieve highly efficient air conditioning equipment, technology developments were undertaken both on equipment systems and on refrigerants. [Research item 1: Safety assessment at the time of refrigerant leakage into the room] Numerical analysis of the diffusion phenomenon when the refrigerant leaked from the room air conditioner in a small room was conducted, and the combustible region volume was obtained. It is necessary to experimentally verify the numerical calculation value of the concentration diffusion at the time of leakage of refrigerant. We prepared for verification experiments. [Research item 2: Diesel explosion at pump down of an air conditioner] We developed an experimental apparatus assuming diesel explosion at pump down, and investigated the difference of combustion generation condition depending on the type of refrigerant. It was found that the flammable range of R290 with strong combustibility is narrower than R32 with weak combustibility. [Research item 3: Safety evaluation of self-decomposition reaction of HFO refrigerant] Fluorocarbon decomposes into materials with low energy when subjected to high energy at high temperature and high pressure. Conditions under which the self-decomposition reaction of refrigerant 1123 occurs were obtained and it was confirmed that they agreed with the results of conventional experiments. [Research item 4: Risk assessment of flammable refrigerant during combustion] A study committee on next-generation refrigerant risk assessment was established at the Japan Refrigeration and Air Conditioning Association, and the NEDO project implementer and Japan Refrigeration and Air Conditioning Industry Association cooperated to carry out risk assessment when flammable refrigerant burned. [Research item 5: Heat exchanger performance of low-GWP refrigerant] A flow boiling experiment was conducted in which a lubricating oil (POE) was mixed with the refrigerant R 32, and heat transfer performance and pressure drop were measured. [Research item 6: Actual performance evaluation technology of medium- and small-sized air conditioning equipment] In this research, we aim at establishing a high-accuracy evaluation method for predicting the cycle performance of systems that make use of various low-GWP refrigerants, which are expected to be introduced as refrigerants for small and medium-sized equipment. As a part of this project, we clarified the thermo-physical properties of these refrigerants and the actual cycle performance within the operative plant, making it possible to select truly effective refrigerants for preserving the environment.
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