成果報告書詳細
管理番号20150000000394
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 一般住宅向け浅部地中熱利用システムの低価格化・高効率化の研究
公開日2015/6/16
報告書年度2014 - 2014
委託先名学校法人日本大学工学部 日商テクノ株式会社 有限会社住環境設計室
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 Renewable Energy Thermal Utilization Technology/Development of Highly Efficient Grand Source Heat Pump System (GSHP), Its Standardization and Area Thermal Potential Evaluation Technology/Development of Low-Cost and Highly Efficient GSHP Systems for Residences (FY2014-FY2018) FY2014 Annual Report

The development has been conducted to realize low-cost and highly efficient ground source heat pump (GSHP) systems for residences. The development goal is as follows;
1. Simple mechanical assembly technology of pile heat exchangers for narrow residential space.
2. Advanced GSHP control system adapted to ground thermal characteristics and their performance evaluation.
3. Ground source reference map for designers effectively providing expected thermal performances as well as residential GSHP design parameters.

At first, simple mechanical assembly technology of pile heat exchangers for narrow residential space is addressed. The development of a simple/low-cost assembly technology of a cylindrical heat exchanger for existing houses utilizing GSHP has been conducted. Basic design of a testing apparatus to evaluate the characteristics of rotary burying mechanism for pile heat exchangers has been completed. A prototype of hydraulic-driven rotary burying mechanism and related evaluation apparatus has been constructed.
In order to develop a novel tip cone of pile corresponding to gravel layer digging, important functions and related problems of the conventional piles such as pile type, cone shape, expected N value and other ground properties have been investigated. 3D modeling has been introduced to evaluate formability and assemble workability of attachment members. Then, development of highly efficient GSHP Technology is addressed.
For accurate evaluations of system performances, our proposed system as well as conventional GSHP systems should be investigated in similar heat load conditions. For the system evaluation, an adequate experimental field of 3000 m² has been facilitated in an area south of Lake Inawashiro based on the joint research agreement on renewable energy between Koriyama city and CENU (College of Engineering, Nihon University). Development of advanced GSHP control system adapted to interior heat load characteristics is another important issue. Open test field for GSHP interior heat load characteristics has been facilitated in Katsurao village, Fukushima Prefecture. An experiment project has been launched based on the village and CENU joint experiment contract4).
Moreover, the development of GSHP reference mapping technology is addressed. Based on the 20 m boring data of the Fukushima city area, average thermal flux as well as design criteria of well thermal flux corresponding to the number of GSHP operation months have been presented. Adequate GSHP operation patterns have been determined by considering the trade-off between the thermal efficiency (exchanged heat/circular pump power) and economic efficiency.
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