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成果報告書詳細
管理番号20170000000343
タイトル*平成28年度中間年報 地熱発電技術研究開発 低温域の地熱資源有効活用のための小型バイナリー発電システムの開発 環境負荷と伝熱特性を考慮したバイナリー発電用高性能低沸点流体の開発  
公開日2017/6/15
報告書年度2016 - 2016
委託先名国立大学法人東京大学 旭硝子株式会社
プロジェクト番号P13009
部署名新エネルギー部
和文要約
英文要約Recently, renewed attention has been paid to low-temperature binary-cycle systems, utilizing the heat in hot springs with a considerably-large introduction potential. Conventional low-boiling-point fluids for binary-cycle systems do not satisfy all the requirements from the environmental impact, low GWP, low ODP, no flammability and no toxicity.
Our goal is to develop a new high-performance low-boiling-point fluid, which is applicable to low-temperature geothermal energy conversion and suited for effective utilization of unused energy from hot springs. In this project, heat transfer and fluid flow characteristics, as well as the environmental impacts and safety factors, are taken into account in the development of the new fluid.
In the University of Tokyoーs group, a series of heat transfer analyses have been performed. The research progresses in FY2016 are summarized as follows:
1. Flow boiling characteristics of existing low-boiling-point working fluids under low-mass-flux and low-heat-flux conditions were experimentally investigated. The data led to an updated version of the design guideline for our new fluid with improved thermo-physical properties; the importance of the pool boiling enhancement and the dry-out suppression is suggested. Also, a raid reactivity evaluation method using micro flow reactor has been developled for the fast screening of the combustibility.
2. A 3 kW-class binary power generation system combining a turbine-generator and plate-type heat exchangers has been constructed. The heat-exchanger performances have been examined using a conventional working fluid (R1233zd), and the cycle performance has been evaluated through power-generation experiments.
3. A VOF-based numerical method incorporating a phase-change heat transfer model has been established for evaporation/condensation heat transfer simulation. Also, new plate-type heat exchangers with oblique wavy walls have been prototyped, showing the manufacturability of our target design.
In Asahi Glass Company (AGC) ーs group, our research scopes are on the followings:
1. Study on synthesis of the high-performance, low-boiling-point fluid.
2. Analysis and study of properties of the high-performance, low-boiling-point fluid.
In FY2016, we synthesized two types of ketone-modified halogenated compounds which were picked out from structural designing, and made it clear that these compounds actually have high thermal conductivity as we have estimated by calculation in designing.
For further study, we have picked out other several ketone-modified halogenated compounds and ether-modified halogenated compounds which were estimated more safe (especially low toxicity) and suitable to the new fluid. We are measuring properties of these in order to select the most promising compound.
We have taken a series of data of liquid-vapor equilibrium of mixtures in order to make it possible to design the mixed fluids (which may be more optimized than single ingredient fluids) by calculation.
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