成果報告書詳細
管理番号20130000000363
タイトル*平成23年度中間年報 グリーンネットワーク・システム技術研究開発プロジェクト(グリーンITプロジェ クト) エネルギー利用最適化データセンタ基盤技術の研究開発 最適抜熱方式の検討とシステム構成の開発 冷却ネットワークとナノ流体伝熱による集中管理型先進冷却システムの開発
公開日2013/6/15
報告書年度2011 - 2011
委託先名株式会社SOHKi
プロジェクト番号P0817
部署名省エネルギー部
和文要約
英文要約Title: Research and Development Project for Green Network/System Technology , FY2011 Annual Report
For a drastic energy conservation in data centers, a new advanced concept of thermal management systems of integrated cooling network in server racks is proposed, and a series of developmental studies toward the realization of the concept have been conducted.

SOHKi CO.,Ltd. is responsible for the development of thermal management systems with liquid cooling technology and cooling network systems and plug-in systems. In FY2011, a continuous study on high performance liquid cooling systems been conducted and plug-in type liquid cooling devices are developed. A prototype server rack with high performance of cooling systems integrated in servers has been constructed, and more than 1,000 hours evaluation shows the high cooling performances.
Experiments were conducted by using simulated sever rack which has 3 parallel test sections installed in sever units. For all sections, individual heat generation rate 300W was removed. The heating surface temperature was about 90 degrees C .A continuous experiment for ten hours was conducted, where heat transfer characteristics were not changed during the experiment. Conditions of liquid flow, i.e. flow rate, inlet liquid temperature and pressure, which realize higher heat transfer performance were investigated for a test fluid of NOVEC7100.
AIST is responsible for the development of high performance heat pipes which transport the heat dissipated in CPUs. The employment of heat pipes is one of the solutions to meet the requirement of customers, i.e. heat dissipated at CPUs is transferred to the outside of servers by heat pipes, and the heat transported is then delivered to liquid cooling network systems. High performance plate-type heat, 3.8mm in thickness and 375mm in length, were developed and outstanding thermal performance, the thermal resistance less than 0.5K/W and maximum heat transport rate over 100W, was confirmed.
InFY2011, measurement of thermal conductivities of silver nano fluids containing spherical nanoparticle or nano-wire by using transit platinum thin hot-wire method has been performed. Thermal conductivities of silver nano fluid containing 0.1 % volume furcation of silver nanowire exhibits aspect ratio of 1,000 are about 11% higher than base fluid water. The thermal performance tests of single-phase liquid cooling by using the nano-water-droplet dispersed FC nano fluid as a coolant were performed. It was found that heat transfer efficiency of the FC nano fluid was improved compared with the base FC liquid especially in low volume flow rate conditions. Thermal performance of heat pipes with gold nano fluids as working fluid were almost twice of high comparing with ones with ordinary water working fluid.
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