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Design optimisation of mean room surface exitance and total corneal illuminance using Monte Carlo simulation

building Simulation 2022年第11期15卷 1869-1882页

作者： Rizki A.Mangkuto Beta Paramita Building Physics Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungBandung 40132Indonesia Architecture Study Program Faculty of Technology and Vocational EducationUniversitas Pendidikan IndonesiaBandung 40154Indonesia

In lighting design,mean room surface exitance(MRSE)has been known as an indicator of the adequacy of illumination in an indoor *** studies have suggested an exponential model relating MRSE and the observer’s retinal *** is particularly applicable in a room with homogenous room surface reflectance and a constant total corneal illuminance,which is the total illuminance received at the ***,accuracy of the exponential model is yet to be assessed in ***,the implication on interior lighting design is also yet to be *** study thus aims to assess the accuracy of the exponential model and to optimise the output *** computations using Monte Carlo simulation are performed for various input variables,followed with sensitivity and uncertainty analyses and *** errors of the exponential model are found between-10%and 6%.The MRSE is highly influenced by surface reflectance,whereas the total corneal illuminance is influenced by the source luminous *** design parameters are obtained by minimising the ratio between total corneal illuminance and ***,this study provides guidelines in lighting design practice for enhancing room spatial brightness while minimising energy use.

关键词： mean room surface exitance corneal illuminance surface reflectance design optimisation Monte Carlo simulation

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A STUDY ON DYNAMIC RESPONSE DISPLACEMENT MEASURING METHODS FOR building UNDER EARTHQUAKE USING SATELLITE technology WITH TWO MOVABLE VIBRATION TABLES

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AIJ Journal of technology and Design 2024年第74期30卷 65-70页

作者： Hashimoto, Akihiro Mukai, Tomohisa Tajima, Kazuyuki Nakamura, Akihiro Ariki, Katsuyoshi Kinugasa, Hideyuki Dept. of Architecture Graduate School of Science and Technology Tokyo Univ. of Science Japan Building Dept. National Institute for Land and Infrastructure Management Program Management Division Ground Facilities Dept. The Japan Aerospace Exploration Agency Dept. of Structural Engineering Building Research Institute Dept. of Structural Engineering Building Research Institute Urban Renaissance Agency Japan Dept. of Architecture Faculty of Science and Technology Tokyo Univ. of Science Japan

In recent years, research has been conducted to establish a method for quickly and appropriately determining damage to buildings during an earthquake using sensors, and it’s useful to appropriately evaluate the maximum and residual displacement during an earthquake. The purpose of this study is to propose a disaster assessment method using a satellite positioning system that directly measures the response displacement of a building from satellite positioning information. In this paper, the positioning accuracy is verified when calculating the relative displacement using two movable vibration tables that assume the top floor of a building and the ground surface under earthquake. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： Earthquakes

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Computational modelling and simulation to mitigate the risk of daylight exposure in tropical museum buildings

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Energy and Built Environment 2024年第2期5卷 171-184页

作者： Rizki A.Mangkuto Tommy Partogi Simamora Desliana Putri Pratiwi Mochamad Donny Koerniawan Building Physics Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungBandungIndonesiaJl.Ganesha 10Labtek VIBandung 40132Indonesia Engineering Physics Program Faculty of Industrial TechnologyInstitut Teknologi BandungBandungIndonesiaJl.Ganesha 10Labtek VIBandung 40132Indonesia Building Technology Research Group School of ArchitecturePlanningand Policy DevelopmentInstitut Teknologi BandungBandungIndonesiaJl.Ganesha 10Labtek IXBBandung 40132Indonesia

In museum design and operation,daylight is typically discouraged due to high risk of damaging the display ***,past studies in high-latitude regions have shown the possibility to apply daylight in museums,so long as it is carefully planned,and the display objects are not from the category of high responsive *** the tropical region,the influence of daylighting on light exposure on museum objects is still *** study therefore aims to assess and mitigate the impact of annual daylight exposure on objects with low responsive materials in a tropical daylit museum *** daylight modelling and simulation are performed to achieve the objective,followed with Morris sensitivity analysis and Mahalanobis distance classifier to optimise the *** is found that either WWR or glazing transmissivity gives the greatest influence on the performance *** on the proposed optimisation algorithm,it is possible to determine the optimum solutions satisfying the performance indicators target,for a certain opening ***,the contribution of this study is the proposed computational modelling and simulation methods to mitigate the exposure risk while optimising daylight as a renewable energy source.

关键词： Daylighting Museum Computational modelling Simulation Annual light exposure

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Comfort control and improved thermostat location in conference rooms and academic working spaces

Comfort control and improved thermostat location in conferen...

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作者： Ghanta, Nikhilesh Kongoletos, Johnathan Glicksman, Leon Building Technology Program MIT CambridgeMA United States

The challenge of comfort control within commercial and academic spaces was explored in an attempt to determine what would be the optimum location and type of measurement over different occupancies and different seasons of the year. A computational fluid dynamic (CFD) simulation using Reynolds-averaged, RNG k – Ε turbulence model was set up. It was verified by physical measurements of temperature and flow behavior within a commercial conference room containing a large external window and that was conditioned by an active chilled beam. Experimental measurements, supplemented by simulation, indicated a large, seasonal-varied deviation between the temperature measured by a wall-mounted thermostat and the average comfort conditions around occupants of the room. CFD results and post-processed predicted mean vote (PMV) values showed that having the thermostat located near the humans in the middle of the room (over a table in this case) improved the thermal comfort conditions compared to having it on a wall opposite the external window (PMV of 1.1 as compared to 1.8 for an Andover, MA summer scenario, respectively). The major causes of the deviations were the convective and infrared heat transfer from the window surface as well as the solar gains to the room interior. The wall thermostat errors could be moderated by including temperature measurements at the window surface as an additional input in the control algorithm. This conclusion was confirmed by experiments in a dormitory room and a large shared academic workspace. © 2021 Elsevier Ltd

关键词： Thermal comfort

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A hypergraph model shows the carbon reduction potential of effective space use in housing

arXiv

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arXiv 2024年

作者： Weber, Ramon Elias Mueller, Caitlin Reinhart, Christoph Building Technology Program Department of Architecture Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States

Humans spend over 90% of their time in buildings which account for 40% of anthropogenic greenhouse gas (GHG) emissions, making buildings the leading cause of climate change. To incentivize more sustainable construction, building codes are used to enforce indoor comfort standards and maximum energy use. However, they currently only reward energy efficiency measures such as equipment or envelope upgrades and disregard the actual spatial configuration and usage. Using a new hypergraph model that encodes building floorplan organization and facilitates automatic geometry creation, we demonstrate that space efficiency outperforms envelope upgrades in terms of operational carbon emissions in 72%, 61% and 33% of surveyed buildings in Zurich, New York, and Singapore. Automatically generated floorplans for a case study in Zurich further increase access to daylight by up to 24%, revealing that auto-generated floorplans have the potential to improve the quality of residential spaces in terms of environmental performance and access to daylight. © 2024, CC BY.

关键词： Housing

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An Analysis of the Effect of Price and Quality on Customer Buying Patterns: An Empirical Study of iPhone Buyers

International Journal of Interactive Mobile Technologies

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International Journal of Interactive Mobile Technologies 2023年第18期17卷 118-128页

作者： Hamizan, Maisarah Abu, Noor Hidayah Mansor, Mohd Fitri Zaidi, Mohd Azian Sdn. Bhd Penang Malaysia School of Technology Management and Logistics Universiti Utara Malaysia Kedah Malaysia Faculty of Applied and Human Sciences Universiti Malaysia Perlis Kangar Perlis Malaysia Building Surveying Program College of Built Environment Universiti Teknologi MARA Perak Malaysia

Companies make use of various strategies in order to attract new customers, retain existing customers, and differentiate their products from those of their competitors. Apple Inc. is a multinational technology company headquartered in Cupertino, California. The company specializes in consumer devices, software, and online services. Apple is the most valuable firm in the world, the fourth-largest vendor of personal computers by unit sales, and the second-largest producer of mobile phones as of May 2022. The iPhone is a product with a strong reputation. Apple has always maintained product quality and continuously made innovations. The iPhone has a unique design, and in view of that, the model is too expensive compared to other mobile phones. Although the price is expensive, demand for the iPhone still increases from time to time. The aim of this research is to understand the factors behind iPhone purchase decisions. An investigation has been conducted to evaluate the relationship between price and quality on customer buying patterns for an iPhone. This study will adopt quantitative methods, and data collection has been conducted through online questionnaire distribution. The target respondents in this study are STML students, and the overall population of STML was 1645 students;thus, the sample size for the study should be 310 respondents. The cluster sampling technique has been used in this study. In this study, a total of 340 respondents were received, and there are 27 missing values in the data set. However, only 313 respondents are valid for the data analysis. Findings revealed that price and quality have a significant effect on the buying pattern of an iPhone. Lastly, this study discusses the limitations of the study and its conclusion. © 2023 by the authors of this article. Published under CC-BY.

关键词： Sales

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Experiment and simulation to determine the optimum orientation of building-integrated photovoltaic on tropical building façades considering annual daylight performance and energy yield

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Energy and Built Environment 2024年第3期5卷 414-425页

作者： Rizki A.Mangkuto Dhian Nur Aziz T.Tresna Ikhwan M.Hermawan Justin Pradipta Nurul Jamala Beta Paramita Atthaillah Building Physics Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungLabtek VIJl.Ganesha 10Bandung 40132Indonesia Engineering Physics Program Faculty of Industrial TechnologyInstitut Teknologi BandungLabtek VIJl.Ganesha 10Bandung 40132Indonesia Engineering Physics Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungLabtek VIJl.Ganesha 10Bandung 40132Indonesia Department of Architecture Faculty of EngineeringHasanuddin UniversityJl.Poros Malino Km.6Gowa 92171Indonesia Architecture Study Program Faculty of Technology and Vocational EducationUniversitas Pendidikan IndonesiaJl.Dr.Setiabudhi 229Bandung 40152Indonesia Architecture Program Faculty of EngineeringUniversitas MalikussalehJl.Cot Teungku NieAceh Utara 24355Indonesia

building-Integrated Photovoltaic(BIPV)on vertical façades is a potential PV application in today’s *** performance of BIPV on façades is significantly influenced by the façade *** tropical cities,the optimum façade orientation,in terms of maximum energy yield and daylight performance,cannot be simply determined,due to relatively symmetrical sun path throughout the *** study therefore aims to determine the optimum orientation for BIPV on tropical building faç*** achieve the objective,experiment,modelling,and computational simulation are conducted to evaluate the BIPV energy yield and to predict the indoor daylight performance in a scale-model building with a 105Wp monocrystalline silicon PV,facing each cardinal orienta-tion in Bandung,*** South orientation yields practically zero ASE_(1000,250),providing the best annual daylight performance,and yielding the most desirable value in four out of five daylight *** greatest annual energy yield is at the North orientation,providing 179-186 kWh(95%prediction interval)per year,but with larger uncertainty compared to that at the South,due to direct sunlight *** on three different objective functions,the South orientation is considered optimum for placing the BIPV panel on the prototype façade in the location.

关键词： building-integrated photovoltaic Orientation Daylight metric Energy yield Tropical building façade

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ANALYSIS OF CAPILLARY ABSORPTION PHENOMENA OF CEMENT PASTE AND MORTAR BY USING TWO LIQUIDS IMMERSION METHOD

Journal of Structural and Construction Engineering

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Journal of Structural and Construction Engineering 2022年第792期87卷 171-181页

作者： Kawasaki, Taihei Yifter, Simon Seifu Fujimoto, Satoshi Graduate Program in Architecture and Building Engineering Utsunomiya University Japan Dept. of Engineering Utsunomiya University Japan Ethiopian Institute of Technology in Mekelle Mekelle University Ethiopia Dept. of Architecture and Urban Design Utsunomiya University Japan

Durability of reinforced concrete is correlated to the water content. Since the main cause of water content increase is rainwater supply from the surface, it is important to understand the mechanism of absorption. This paper analyzes the initial absorption of cement mortar caused by the capillary phenomena. Absorption test for two liquids were conducted for various mix proportions under several relative humidity and surface treatments. By using Lucas-Washburn equation, parameters corresponding to pore structure and wettability of pore internal wall were evaluated. It was found that almost any mix proportions of cement mortar have approximately the same internal pore wettability. © 2022 Architectural Institute of Japan. All rights reserved.

关键词： Wetting

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Influence of rice husk ash and hybrid fiber on engineering properties of densified high-performance fiber-reinforced concrete

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Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 2023年第11期237卷 2845-2857页

作者： Vo, Duy-Hai Nguyen, Minh-Hieu Nguyen, May Huu Hwang, Chao-Lung Huynh, Trong-Phuoc The University of Danang University of Technology and Education Danang Viet Nam Vinh Long Department of Construction Vinh Long Viet Nam Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Japan Department of Bridge and Tunnel Faculty of Civil Engineering University of Transport Technology Hanoi Viet Nam Taiwan Building Technology Center National Taiwan University of Science and Technology Taipei Taiwan Faculty of Civil Engineering College of Engineering Can Tho University Can Tho Viet Nam

Conventional concrete significantly affects the environment due to high CO2 emission into the atmosphere during the production process. In order to improve concrete performance and arrest the incidence of global warming, the use of additive materials for cement replacement has been promoted worldwide. This study was designed to investigate the mechanical properties of high-performance fiber-reinforced concrete (HFRC) produced using rice husk ash (RHA) and hybrid fiber (HF) in accordance with the densified mixture design algorithm (DMDA) mix design method. Samples were produced using RHA as a direct replacement for cement at 10%, 20%, and 30%. HF, comprising steel and polypropylene fibers, was added (by volume) to the 20% RHA group mixture to improve the HFRC sample properties. Based on the experimental results, higher RHA contents had a generally negative effect on the fresh properties of the HFRC mixtures. Compressive strength values ranged from 53 to 72 MPa with various RHA and HF content. RHA replacement levels up to 20% had an insignificant effect on the strength development and dynamic modulus of the HFRC samples. However, the addition of HF improved splitting tensile strength, flexural strength, and dynamic modulus remarkably at all curing ages. Furthermore, the 91-day drying shrinkage was in the ranges of 0.032%–0.039% and 0.023%–0.034% using different RHA and HF levels, respectively. Increasing both RHA and HF contents significantly reduced drying shrinkage in the samples. Multivariable regression was also performed, clarifying that all tested results were consistent and had good correlations. The results of this study also provide a potentially effective use for abundantly available industrial waste products such as fly ash (FA) and RHA to promote the production of greener and more sustainable concrete. © IMechE 2023.

关键词： Bending strength

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Hydrogen production by steam reforming of fusel oil over Ni-based fiber catalyst

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Materials Today: Proceedings 2022年 57卷 1147-1153页

作者： Le-Mai, T.H. Mhadmhan, S. Trieu, T.Q. Prasongthum, N. Suriya, P. Reubroycharoen, P. Department of Chemical Technology Faculty of Science Chulalongkorn University Bangkok10330 Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University Research Building Bangkok10330 Thailand Program of Petrochemistry Faculty of Chemical Engineering Industrial University of Ho Chi Minh City 70000 Viet Nam Pathum Thani12120 Thailand

This research aimed to evaluate the fusel oil steam reforming over Ni/carbon nanotubes-silica fiber (Ni/CNTs-SF) catalysts prepared by impregnation method with 10 wt% of Ni loading. CNTs-SF was synthesized by chemical vapor deposition (CVD) using ethanol as a source for CNTs over steam reforming. The prepared catalysts were analyzed by BET, XRD, TEM, FESEM-EDS, Raman, and TG/DTG. Ni/CNTs-SF catalyst was tested for fusel oil steam reforming and compared with Ni supported on conventional silica such as a silica fiber (SF) and a silica porous (SP) at the same loading. The results found that Ni/CNTs-SF catalyst showed better catalytic activity and stability than Ni/SF and Ni/SP. TGA profile of the catalysts after fusel oil steam reforming showed that the severe carbon deposited over Ni/SP at 64% (wt%), while at 31% was found over Ni/CNTs-SF catalyst and Ni/SF catalyst. In addition, Ni/CNTs-SF catalyst exhibited the highest hydrogen yield at 15%, and Ni/SF and Ni/SP catalysts gave a lower yield of hydrogen at 11% and 7%, respectively. © 2021

关键词： Carbon nanotubes

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