成果報告書詳細
管理番号20150000000685
タイトル*平成26年度中間年報 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業 (風力発電その他未利用エネルギー) 地中熱利用冷暖房システムの熱源設備の技術開発
公開日2016/3/1
報告書年度2014 - 2014
委託先名株式会社バーチャル・ハーモニー 国立大学法人茨城大学
プロジェクト番号P10020
部署名イノベーション推進部
和文要約
英文要約Title: New Energy Venture Business Technology Innovation Program / New Energy Venture Business Innovation Program (Wind Power Generation and Other Untapped Energies) /Improvement of heat collection device for air-conditioning system using underground heat (FY2014-FY2015) FY2014 Annual Report

In Ibaraki university, a series of Thermal Response Test(TRT) using actual undergroundheat system are planned. In order to evaluate the performance of our underground heat system, "heat" and "fluid" flow in underground must be understood. Therefore, we proposed the actual full-scale experiments and the simple small-scale experiments to investigate the heat and fluid flow in underground.Different two types of experiments are planned. One is the (1)Full-scale underground heat experiment (2)Small-scale underground heat experiment, and (3)Direct measurement of thermal conductivity of soil using twin heat prove method.

(1)Full-scale underground heat experiment
We designed full-scale heat collection equipment. The design poly is based on the study for borehole-type underground heat collection, steel-pile-type underground heat collection, the difference between using single-U-tube and using double-U-tube,the distance among piles not effected each other.
We constructed the full-scale underground heat collection expeiment equipment in Ibaraki University.
(2)Small-scale underground heat experiment
In order to understand the mechanism of heat transfer and temperature distribution in underground,we proposed the small-scale underground heat experiment. In this experiments, U-shape stainless steel tube(φ=1mm) are embedded in soil. The hot water flows into the U-shape tube inlet and the tube exchange its energy with the surrounding soil. Due to the heat exchange between tube and soil,the water temperature decrease and heat is transferred to the surrounding soil. By measuring the transient temperature distributions in the soil, we can understand the heat transfer process in the soil. These results will be useful for understanding the heat transfer in the actual underground.
(3)Direct measurement of thermal conductivity
Most of the performance of underground heat system are evaluated by the effective thermal conductivity which obtained by the TRT. However, validity of effective thermal conductivity in actual underground system is not well discussed. In this experiment, we directly measure the thermal conductivity of soil by using the “heat probe” method. The heat probe method directly measures the thermal conductivity of soils with a heat probe. The heat probe is made of a stainless steel tube (1mm outer diameter, 50mm long), and a heating wire and a thermocouple are placed into the pipe. When the heat probe is embedded in the soil and heated by a constant power for a few minutes, the generated heat transferred to the surrounding soil. By measuring the temperature change in the probe, the thermal conductivity can be calculated by the changes of the probe.
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