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Inouye S.,Otsuma Womens University | Okabe N.,Japan National Institute of Infectious Diseases | Obara H.,Tokyo Metroplitan University | Sugihara Y.,Nikken Sekkei Research Institute
Japanese Journal of Infectious Diseases | Year: 2010

To assess the degree to which face masks reduce the strength of cough-wind, we measured the wind pressure in front of the mouth with and without the wearing of masks. We found that any conventional mask made from paper, cotton gauze, or non-woven fabrics reduced the wind pressure to less than one-tenth of that recorded when no mask was worn. Source


Matsunaga H.,Kajima Corporation | Iizuka S.,Nagoya University | Yoon G.,Nagoya City University | Okumiya M.,Nagoya University | Niwa H.A.,Nikken Sekkei Research Institute
Journal of Environmental Engineering (Japan) | Year: 2015

In this study, a coupled analysis of computational fluid dynamics (CFD) and heating, ventilation, and air-conditioning (HVAC) system simulations was applied to a multi-split air-conditioning system in the operation phase during a power-saving period in summer. Two different forced operation schemes for the indoor units, i.e., a regular rotation control and a lowest reference temperature control for switching cooling and fan modes, were designed, and the effects of the two operation schemes on the indoor thermal environment were investigated. When the reference temperature points for the indoor units were located at a height of the occupied zone, the lowest reference temperature control was better than the regular rotation control from the viewpoint of creating a more uniform thermal environment in the occupied zone. Source


Sudo T.,Nikken Sekkei Research Institute | Kajiya R.,Meiji University | Sakai K.,Meiji University
Proceedings of BS 2013: 13th Conference of the International Building Performance Simulation Association | Year: 2013

An effective means for greenhouse gas reduction is to use sewage heat, an unused energy resource, for air conditioning. This study conducts energy evaluation of the utilization of treated sewage, heretofore discarded from the sewage disposal plant adjacent to a developing area, as a heat source of air-conditioning for that developing area by simulation. The result estimates 12.2% reduction in annual equivalent primary energy consumption (6.4% for cooling; 36.1% for heating) with a system using a heat pump. It also predicts 16.8% of reduction in annual greenhouse gas emissions, which verifies the efficacy of sewage heat utilization. Copyright © 2011 by IPAC'11/EPS-AG. Source


Ando A.,Nikken Sekkei Research Institute | Morikawa T.,Nagoya University | Miwa T.,Nagoya University | Yamamoto T.,Nagoya University
IET Intelligent Transport Systems | Year: 2010

While road pricing (RP) is considered one of the most effective means of traffic demand management (TDM), its poor acceptability has been the greatest impediment to its implementation. The authors propose a 'parking deposit system' (PDS) as an alternative RP scheme, and the aim of this study is to examine PDS's superiority focusing primarily on acceptability. To mutually verify the acceptability of PDS and conventional RP, the authors conducted a survey in the city of Nagoya, the third-largest incorporated city and the fourth most populous urban area in Japan. This survey distributed a comprehensive questionnaire to visitors and business establishments, in and around the city, eliciting a significant response. In this study process, the authors firstly built the decision-making structure model of RP/PDS by public/business establishment to clarify the decision-making mechanism in detail. Secondly, the approval models were built to estimate the differentia of the acceptability between RP and PDS. From this study PDS can be thought to have the higher acceptability, and to be useful measure as an alternative RP scheme. © 2010 The Institution of Engineering and Technology. Source


Matsunaga H.,Nagoya University | Iizuka S.,Nagoya University | Okumiya M.,Nagoya University | Yoon G.,Nagoya City University | And 2 more authors.
Indoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate | Year: 2014

In this study, a coupled analysis of computational fluid dynamics (CFD) and heating, ventilation, and air-conditioning (HVAC) system simulations was applied to a multi-split airconditioning system in the operation phase during a power-saving period in summer. In particular, the effects of two different forced operation controls for indoor units, regular rotation control and lowest reference temperature control for switching cooling and fan modes, were investigated. The lowest reference temperature control for switching from the cooling mode to the fan mode was better than the regular rotation control from the viewpoint of creating a more uniform thermal environment, especially when the reference temperature points were located in the occupied zone of the targeted office space. Source

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