成果報告書詳細
管理番号20150000000542
タイトル*平成26年度中間年報 再生可能エネルギー熱利用技術開発 地中熱利用トータルシステムの高効率化技術開発及び規格化 地下水循環型地中採熱システムの研究開発
公開日2015/7/17
報告書年度2014 - 2014
委託先名株式会社守谷商会
プロジェクト番号P14017
部署名新エネルギー部
和文要約
英文要約Title: Technology Development for Utilizing Renewable Thermal Energy; Technology Development for Enhancing Efficiency of Total System Utilizing Geothermal Energy and Establishing Its Standards; Research and Development of Geothermal Extraction System of Recirculating-Ground-Water Type (FY2014) Mid-Year Report

This research and development is attempting to reduce the overall installation cost and the operating cost of a geothermal heat pump system by achieving a high efficiency heat exchange system in which the ground water with thermal energy is fed into a closed loop horizontal geothermal energy extraction system that is buried near the surface of the ground.In this research and development, the structure of the heat exchanger pool has good permeability in which the supplied ground water is percolated back into ground so that the system will be a self-contained recharging system. Also, the coefficient of permeability and the porosity of permeable materials filling the heat exchanger pool are optimized so that a so-called “dried-up heat” phenomenon is difficult to occur. In this research and development, the system is referred to as “a recirculating ground water type geothermal extraction system.” The recirculating ground water type geothermal extraction system is a closed loop horizontal geothermal extraction system in which geothermal heat is extracted by means of circulating the heat exchange media in a heat extraction pipe buried in a shallow layer of the ground. This system is composed of a heat exchanger pool having good water permeability, heat extraction pipes installed in the heat exchanger pool, and a ground water supply unit that pours the ground water from the top of the heat exchanger pool. In configuring this system, the research has been performed on the following three items:1) analysis of thermal conduction (transfer) related to the flow of the ground water in the heat exchanger pool, 2) development of a pre-cast heat exchanger pool, and 3) development of the control system for supplying ground water. In addition, a demonstration plant (with 20kW capacity) was constructed. In the analysis of the thermal conduction (transfer) that is performed during this research and development, complex phenomena, such as why dried-up heat will not occur, have been theoretically verified, and rationality of the equipment structure has been qualitatively shown. Because of the technology development related to two other items above, it has become possible to construct the demonstration plant for this system. The trial operation and adjustment of the demonstration plant is expected to be completed in FY2014. For the next year and beyond, it is planned to verify the baseline volume of heat extraction, to verify the optimum spray volume of ground water, to verify the optimum operation time of the well pump, and to verify the durability of the heat extraction equipment.
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