成果報告書詳細
管理番号20110000001548
タイトル*平成22年度中間年報 次世代型ヒートポンプシステム研究開発 地下水制御型高効率ヒートポンプ空調システムの研究開発
公開日2011/10/12
報告書年度2010 - 2010
委託先名清水建設株式会社 国立大学法人信州大学
プロジェクト番号P10011
部署名エネルギー対策推進部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等
(1) 全体システムの高効率化技術の開発
(a) 2次側空調システムの検討
2次側空調システムは地下水温度と親和性が高い潜熱顕熱分離空調方式が有利と判断した。具体的にはインテリアゾーンの顕熱処理に対して地下水を冷房時にそのまま利用できる金属パネルによる放射式冷暖房あるいはドライコイル型空調機またはファンコイルユニットの採用が考えられる。ペリメータゾーンでの顕熱処理は外気に面した部分で窓など開口部があり、また日射の影響を受けるため、インテリアゾーンに比べて単位面積当たりの空調負荷が大きく、一日の変化幅も大きい。このため、ペリメータゾーンへは放射パネルの中で対流による冷却効果も期待できる特殊な放射パネルやチルドビーム(パッシブ型またはアクティブ/パッシブ併用型)あるいはドライコイル型ペリメータ用ファンコイルユニットを用いることなどが可能である。なお潜熱処理は地下水を熱源とした水冷式ヒートポンプが有利と判断した。
英文要約Title: Research and Development of the Groundwater Source High-efficiency Heat Pump Air Conditioning System (FY2010-FY2012) FY2010 Annual Report
1. Development of system efficiency improvement technology (1) Air conditioning system : As the air conditioning system, the dedicated outside air system combined with dry fan coil units are adopted. A building was specified for calculation, annual thermal load was calculated and the optimum control method was examined for the air conditioning system to improve overall efficiency. (2) Heat pump (HP) : Groundwater source HP contributing to the improvement of the air conditioning system efficiency was examined. A free-cooling/HP hybrid equipment was proposed that enables most efficient operation by automatic bypass control according to the groundwater temperature.
(3) Groundwater control technology : The arrangement of pumping and recharging wells was considered that enable effective use of heat storage capacity of the ground. The conceptual design of wells and pumps was developed. The temperature of groundwater and the heat storage capacity of the ground were evaluated by 3D fluid and heat flow simulation. (4) Overall evaluation : Overall evaluation of the developed system was made in three areas in Japan using simulation models. It was presented that the developed system was 1.7 to 1.8 times more efficient than a conventional system (variable refrigerant flow system). 2. Development of the water quality control technology : The direct usage of the ground water to the HP was examined. And the conditions under which plugging occurs and the effectiveness of plugging factor removal methods were identified by laboratory tests. The conceptual design of the system to prevent plugging was performed every quality of the water classification. 3. Verification of key technologies by verification tests : Nagano campus of Shinshu University has been selected as a test site. A variety of field tests including all-core boring, electrical and thermal logging, pumping tests and thermal tracer tests has been performed to identify hydrogeologic and thermal properties of the aquifer. Rooms in a lecture building were specified for air conditioning verification tests and test facilities (air conditioning system, HP, etc.) were examined based on field conditions. The conceptual design of a verification system was developed that could achieve efficiency improvement by a factor of 1.5 or higher than a conventional system. 4. Examination of Performance and cost effectiveness of commercial models : In order to investigate the areas in Japan where the developed system was applicable, hydrogeological data was collected and organized to build a database. A national map was prepared that shows the areas to which the system is applicable based on the results of quantitative evaluation by checking the indicators for evaluating the suitability of areas. Methods for and results of examining suitable areas through groundwater flow analysis were also presented.
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