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成果報告書詳細
管理番号20170000000292
タイトル*平成28年度中間年報 未利用熱エネルギーの革新的活用技術研究開発/技術シーズ発掘のための小規模研究開発(蓄熱)/潜熱蓄熱装置における凝固層剥ぎ取りによる高速熱交換に関する研究開発
公開日2017/6/7
報告書年度2016 - 2016
委託先名国立大学法人東北大学多元物質科学研究所
プロジェクト番号P15007
部署名省エネルギー部
和文要約
英文要約Title: Development of latent heat storage device with high heat exchange charactristics by scraping solidified layer of PCM (FY2016-FY2017)FY2016 Annual Report

Utilization of energy cascade from a higher-temperature process to a lower-temperature process is necessary to establish a sustainable society. Latent heat storage, in which the heat is stored using the latent heat of a phase change material (PCM) during melting, is a key method to utilize waste heat. However, a solidification layer of PCM on the heat exchange wall blocks heat transfer during the heat releasing period. Consequently, the release rate of the stored heat is slow. Herein we proposed a new concept for rapid heat exchange in latent heat storage, called "Scraping Solidified Layer of PCM on the heat transfer wall". In this mechanism, the heat transfer tube is rotated, and the solidified PCM layer on the heat transfer tube is immediately removed by a fixed blade attached to the wall.
Developments of the experimental setup and numerical solver for evaluating the heat transfer rate in a latent heat storage device with 50-kg PCM were completed in 2016.
Experimental setup
Developed experimental setup has the following characteristics.
PCM
Material: CH3COONa 3H2O
Melting point: 58 °C
Weight: maximum 55 kg
Heat transfer tube
Material: SUS316 for chemical stability against PCM
Diameter: 51.8 mm O.D.
Length : 500 mm
Rotation rate : maximum 500 rpm
Outer fixed blade: Teflon, maximum 8 plates
Heating medium : water, 40-70 °C
Solver
Developed solver has following characteristics.
OpenFOAM-v1612+
Multi-phase analysis(solid, liquid)
Turbulence analysis
Thermal diffusion analysis
Phase transformation analysis(solid, liquid)
Thermal conductivity analysis
Parallel computation
In 2017fy, the rates of heat release and heat storage will be investigated using the developed equipment and solver. The probable experimental parameters are as follows:
Flow rate of water
Temperature of water
Rotation rate
Number of outer fixed blades
Gap between blade and heat transfer tube
Diameter of heat transfer tube
Immersed length of heat transfer tube into PCM
Size of PCM bath
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