Nikken Sekkei Research Institute

Japan

Nikken Sekkei Research Institute

Japan
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Otsuka K.,Keio University | Ikaga T.,Keio University | Murakami S.,Institute for Building Environment and Energy Conservation | Kuzuki R.,Tokyo Gas Co. | Kawayoke T.,Nikken Sekkei Research Institute
Journal of Environmental Engineering (Japan) | Year: 2017

A community energy system is expected to contribute to improving the resilience and regional vitalization not only carbon emission reduction. Prior studies did not accrued non-energy benefits by the risk aversion with respect to temporal changes in business and daily life activities associated with lifeline utilities such as electricity, water, and gas. This paper focuses on the following issues; 1. To propose estimation method for resilience improvements based on Resiliency Factor and a recovery curve for business activity according to the lifeline stoppage time. 2. To derive a basic unit of loss due to electric power failure according to stoppage time, derive the estimation model of a basic unit that considered housing form and address of residence, proposed an evaluation method for resilience in the housing sector in monetary terms. 3. To perform case studies of evaluation of monetary value for resilience improvements by introducing a community energy network.


Avalone Neto O.,Chiba University | Munakata J.,Chiba University | Jeong S.,Tokyo University of Science | Yoshida Y.,Nikken Sekkei Research Institute
Journal of Environmental Engineering (Japan) | Year: 2017

This study investigates how changes in the amount of three elements commonly manipulated in public space design - trees, bushes and seats - affect users' perceptions, impressions and intended behavior on privately owned public open spaces - POPOS. The study uses simulated immersive virtual environments presented with a head-mounted display. Potential users evaluated several design variations of four different POPOS of Tokyo, Japan, using 21 different semantic differential and two rating scales. The effects of tree cover ratio, tree height, bushes ratio and seating ratio in five intended activities, nine impressions and six physical scales are described, as well as the relationship between different scales. The effects on willingness to pay and stay duration are also provided. The study's results exhibited a positive effect of seat and tree cover ratio across several scales. Bushes ratio and tree height had minor effects on some scales, as did the interactions between tree cover ratio and tree height and between tree and seating ratio. No interaction was found between tree height and seating ratio. Increasing seating ratio increased willingness to pay and stay duration. Differences among sites are discussed.


Neto O.A.,Chiba University | Jeong S.,Tokyo University of Science | Munakata J.,Chiba University | Yoshida Y.,Nikken Sekkei Research Institute | And 2 more authors.
Journal of Asian Architecture and Building Engineering | Year: 2016

This paper seeks to determine which physical elements of privately owned public spaces affect users' impressions, which characteristics of these elements are noticed, and what impressions they cause. The study is based on a caption evaluation and semantic differential survey of 12 public spaces in the center of Tokyo. Ten participants were surveyed for each space, and 1494 of the obtained entries were analyzed. The semantic differential survey was then cross-referenced with density measures to evaluate the effect of physical elements' densities on participants' impressions. It was found that the physical elements that caught users' attention were greenery, street furniture, the building, the sidewalk and the space itself. From all of the elements, tree coverage density was the best predictor of desire to stay and rest activities in the space. A logistic regression analysis of each activity by tree density is also provided. © 2016, Architectural Institute of Japan. All rights reserved.


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.


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.


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.


Taniguchi M.,University of Tsukuba | Kodama K.,Nikken Sekkei Research Institute | Fujii T.,Tottori University
WIT Transactions on the Built Environment | Year: 2010

Realization of a compact urban structure with a low transport environmental load to achieve a low carbon society has persisted as a critical social issue. Results of studies have confirmed repeatedly that a deep relation connects residential density and transport loads on the environment. Moreover, a relation between residential environments and transport loads has already been clarified in areas for which inhabitant transport activity data are available. However, the information obtained to date is insufficient for local administrators and local residents to be involved extensively in constructing a low-carbon-type urban structure. Specifically, urban planning guidelines must plainly present information of various types. Based on the consciousness of the problem described above, this paper presents a proposal for urban planning guidelines that aggregate statistical information related to 1,996 detailed areas and the transport activities of 57,243 people. In the proposal, securing usability and generalization is addressed through the lateral collaboration of researchers in fields related to urban structure reformation, such as transport planning, urban design, and geography. The prepared guidelines were actually used in communications with local government representatives: their usefulness was demonstrated. © 2010 WIT Press.


Sudo T.,Nikken Sekkei Research Institute | Kajiya R.,Meiji University | Sakai K.,Meiji University | Okusa T.,Meiji University
14th International Conference of IBPSA - Building Simulation 2015, BS 2015, Conference Proceedings | Year: 2015

The integration of two technologies - The Airconditioning Duct System and Optical Mirror Duct System - into a new energy-saving system "Integrated Optical Air Duct System" (IOAD) significantly reduces the lighting energy, which accounts for roughly 30% of the energy consumption in large-scale office buildings. The utilization of IOAD in combination with other energy reduction techniques could help these office buildings become Zero Energy Buildings (ZEB). The IOAD System could minimize the effect of natural light loss during light transport inside the air conditioning duct branches and thus allow for the efficient usage of day light. CFD simulations were performed to examine the flow of conditioned air in the duct.


Kajiya R.,Meiji University | Sudo T.,Nikken Sekkei Research Institute | Sakai K.,Meiji University
Indoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate | Year: 2014

Temperature and wind velocity in a double-skin cavity using a real air tube were measured. Simulations using CFD analysis were conducted for the same target measurement region using the measured values as the boundary condition. Referring to a comparison of measurement results and CFD results, the temperature distribution in the cavity and air current properties were ascertained, the reproductive accuracy of CFD analysis was improved, the amount of exhaust heat in the cavity was calculated preliminarily, and the effects of cooling load reduction were verified. Results show that CFD is applicable a temperature distribution in a double skin and to the air flow distribution. Results also revealed that a double skin using an air tube is an energy-saving system that reduces the cooling load.


Sudo T.,Nikken Sekkei Research Institute | Kajiya R.,Meiji University | Sakai K.,Meiji University
Indoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate | Year: 2014

The integrated optical air duct system (IOAD) is a new energy-saving system, which utilizes technologies from both the air-conditioning duct system and the optical mirror duct system. By integrating these two systems, IOAD can significantly reduce the energy from lighting, which directly accounts for 30% of the energy consumption of most large-scale office buildings incorporating energy reduction techniques to become Net Zero Energy Buildings (ZEB). The IOAD has the function to minimize the attenuation of natural light from the air conditioning branch and allow for the efficient usage of such light. The flow of conditioned air in the duct was verified according to CFD simulation. As a result, it was found that the flow of air-conditioning air could move smoothly throughout the IOAD, and allow natural light to flow through the room in the same manner as the air condition, which provides a higher quality environment.

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