成果報告書詳細
管理番号20160000000542
タイトル*平成27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 低コスト・高効率を実現する間接型地中熱ヒートポンプシステムの開発と地理地盤情報を利用した設計・性能予測シミュレーションツール・ポテンシャル評価システムの開発
公開日2016/9/7
報告書年度2015 - 2015
委託先名国立大学法人北海道大学大学院工学研究院 株式会社日伸テクノ 鉱研工業株式会社 株式会社イノアック住環境 サンポット株式会社 新日鉄住金エンジニアリング株式会社 ジーエムラボ株式会社
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Development of low-cost and high-performance ground source heat pump system and its design and evaluation method
(FY2015) Annual Report
Hokkaido University

Summary of research project

The main aspects are summarized as follows according to the main areas of the project.
1. Development of a boring machine, a boring method, and a high-performance vertical ground source heat exchanger that can reduce installing cost
A vibrating head was constructed and, by borehole drilling tests, it was confirmed that drilling is possible at higher speed comparing to a conventional boring machine. Also, it was confirmed by experiments using the spiral rod model that mounting a plate-shaped wing parallel to the rod axis direction can improve the earth removal efficiency. Additionally, the development of the drill rod automatic desorption apparatus was started.
An oval shape U tube was fabricated and an insertion test was carried out in the borehole where the U tube was able to be inserted without any problem. Moreover, the superiority of the oval shape U tube thermal performance over a conventional U tube was confirmed by means of thermal response tests.

2. Development of a multi-source and multi-functional ground source heat pump unit with low cost and high efficiency
The cycle simulation of a heat pump using gas injection was set up and, by comparative experiments, the validity of the simulations was confirmed.
The current 30kW-class inverter controller and the newly developed 30kW-class non-inverter controller were joined in one package and a prototype of a 60kW-class air-conditioning heat pump was developed. Additionally, a hot-water supply dedicated heat pump prototype was developed and by performance tests, it was confirmed that the target was achieved.
A controller for a heat pump system with auxiliary heat sources provided by a heat pump and cooling tower, solar heat, etc. was developed.

3. Development of an optimal control system for a ground source heat pump system that contributes to cost reduction and performance improvement
Development of an optimal control system for the recovery-type ground source heat pump. Additionally, an optimal design method to get the most out of the indirect heat recovery effect (short-term heat storage effect) and direct heat recovery effect was developed.

4. Development of the design and performance prediction simulation tool for GSHP systems utilizing geographic and geological information and creation of a potential evaluation map for GSHP systems.
From the AIST’s deep well information "Idojibiki", an algorithm for the kriging estimate from geological information at any point was developed. Also, information such as the water table elevation and the soil temperature were captured in the database.
Aiming at the practical use of a design and performance prediction tool single-layer version, this was improved to an internet based version (Web Ground Club). Moreover, the usability and interface were improved. Also, approaching towards a multi-layer ground built-in, and through ground database, a prototype that can get the ground data was created.
The input interface of the ground source heat exchanger GEO Modeler was improved, and the ground coupled analysis of the double U tube and the oval shape U tube underground based heat exchangers of ground was possible. Also, because it is necessary to take into account the natural convection around the underground heat exchanger, it was performed a heat flow analysis that considered natural convection.
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