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Auflistung nach Autor:in "Ohkura, Masashi"

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  • Konferenzbeitrag
    A Model for the Evaluation of Potential Energy Conservation of Data Center Focusing on the Air Conditioning Options in Japan
    (Innovations in Sharing Environmental Observations and Information, 2011) Mori, Shunsuke; Ohkura, Masashi; Ohkura, Hidetaka
    The importance of carbon emission reduction is now broadly understood. After the gigantic earthquake on March, 11, 2011, the first priority issue for Japan is the recovery of the society and economy. However, most of the energy conservation options for the global warming mitigation are applicable under the energy constraints. Until today, the impacts of information and communication (ICT) industry have not been well addressed. In Japan, Ministry of Internal Affairs and Communications(MIC) has assessed that the power consumption for the air-conditioning of data centre (DC) indicates 17% of total power demand for ICT. In this study, we develop an optimization model considering the temperature and humidity conditions for DC with 2000 racks in Tokyo and Sapporo including - Cogeneration systems - LNG vaporizer to utilize the evaporating heat - Photovoltaic cell (PV) - Ambient air intake - Turbo refrigerator - Humidifier The results show that 23.9% and 11.9% of CO2 emission could be reduced by introducing photovoltaic cells and humidifier in Tokyo and Sapporo, respectively. The ambient air is largely utilized in Tokyo except for summer while it is not mainly utilized in Sapporo due to the low humidity. Thus, humidifier in Sapporo contributes to reducing CO2 emission in Sapporo. Key Word: data centre, energy conservation, ambient air, LNG vaporizer, humidity control
  • Konferenzbeitrag
    Data Centre as a Key Player of a District Electric Power and Heat Network System; comparison in Urban and Suburb Regions
    (Proceedings of the 27th Conference on Environmental Informatics - Informatics for Environmental Protection, Sustainable Development and Risk Management, 2013) Mori, Shunsuke; Hori, Yuuki; Ohkura, Masashi; Kamegai, Kazuhisa
    A data center(DC) demands air-conditioning power as large as the 1/3-1/2 of total electricity consumption.Thus, energy saving of cooling power of DC yields considerable effect on both economic and environmental views.Photovoltaic (PV) and absorption refrigerator with gas boiler or cogeneration systems(CGS) are possible power saving options. The waste warm air from DC would be utilized for greenhouse heating when DC and greenhouse locate near in the suburbs. In this study, the authors develop an energy network model to assess the potential contribution of DC as a major electric power and chilled air consumer as well as the warm air supplier in a district to the energy efficiency improvement. The evaporation heat of LNG utilization is also considered as well as PV, CGS. This model is applied to the cases of the urban area in Tokyo which involves athletic center, shops and hospital and the suburbs including greenhouse and then compared. Key word: data center, distributed energy systems, urban and suburbs