成果報告書詳細
管理番号20150000000378
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、および再生可能エネルギー熱利用のポテンシャル評価技術の開発 地下水を利活用した高効率地中熱利用システムの開発とその普及を目的としたポテンシャルマップの高度化
公開日2015/6/16
報告書年度2014 - 2014
委託先名日本地下水開発株式会社 国立大学法人秋田大学 独立行政法人産業技術総合研究所
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: Development of high performance geothermal heat pump system using groundwater and Advancement of the potential map for popularization. (FY2014-FY2016)FY2014 Annual Report

Two wells of the structure that sealing up-style injection is possible were installed newly, a diameter of those wells is 150mm, a depth of those wells is 72m and strainer depth 40m - 68m of those wells. Those wells confirmed that pumping of 200L/min was possible. The injection quantity doubling was possible by pressurization by the sealing up-type injection was confirmed whereas the ability for injection was up to 250L/min by the opening-style injection. The model under the ground was build using the result of bowling and prepared for the craze for three-dimensional groundwater flow transportation analysis. For the development of the heat pump which is most suitable for ATES system and support a variety of groundwater quality we devised a groundwater heat exchanger automatic washing method and designed the device. Incorporate the heat exchanger which you devised in the ATES system, as a result of having performed the performance prediction of the heat pump, that system was judged to be able to promote efficiency of it. Groundwater incubation studies were performed to estimate the effect of change in temperature on subsurface microbes. Total cell numbers and community structures of microbes were correlated with the cultivation temperatures. In addition, the pathogens were not detected during the incubation period. In the field test, we carried out TRTs with water circulating, pumping and injection and investigated the suppressing effect of the temperature increase of the heat medium in comparison with normal TRT. As a result, the enhancement of heat exchange capacity was not observed in circulating TRT. In the pumping and injection TRTs, the increase of heat medium temperatures were reduced as the pumping and injection rates increased. We then calculated COP and power consumption of heat pump based on the field test results, indicating that the COP and the power consumption were improved by 12-14% in comparison with normal case in the case of 5L/min pumping or injection. In this study, geological and groundwater surveys will be conducted at major areas of each prefecture in Tohoku. Based on groundwater flow and heat exchange simulation, potential maps will be prepared. Major tasks done in FY 2014 are as follows. 1) As preparation to measure thermal properties, thermal conductivity meter QTM-500 was purchased. 2) For experimental site, Japan Groundwater Development’s Akita branch office, Koriyama and Sendai cities are nominated. 3) For groundwater flow - heat transport modeling, selection of Koriyama Basin, collection of hydrogeological data and construction of 3D model were done.
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