Yuan, Jihui

Japanese

Affiliation	Department of Architecture and Civil Engineering
Title	Asst. Professor
Fields of Research	Building and Environment Engineering
Degree	Ph.D
Academic Societies	Architectural Institute of Japan, The Society of Heating, Air-Conditioning and Sanitary Engineers of Japan
E-mail	yuan@ace Please append ".tut.ac.jp" to the end of the address above.
Laboratory website URL	http://bed.ace.tut.ac.jp/index.html
Researcher information URL（researchmap）	Researcher information

Research

　Climate change due to global warming and the heat island phenomenon that is conspicuous in urban areas have become serious and have a strong impact on people's lives and health. The cause is said to be an increase in carbon dioxide emissions. In the industrial sector, a one-third emission ratio has been pointed out in the building sector, and as a result, reducing carbon dioxide emissions from buildings has become a national policy. Therefore, terms such as Zero Energy Building (ZEB) or Zero Energy House (ZEH) have emerged.

　One of such measures is to make the building coating highly reflective. Until now, it was merely a matter of increasing the high reflection, that is, improving the albedo. However I have been working on changing the reflection characteristics of external wall surface from diffuse highly reflection into retro-reflection. Although various results have been obtained in the retro-reflection study, it is important to raise it to a practical level for next work. Moreover, the research will also be focused on the optimal thermal properties and optimization of the building coating for energy conservation throughout the building.

Theme1：Research on highly reflective and retro-reflective building coating for urban heat island mitigation

Overview

Retro-reflective building coatings

　In the architectural field, as a result of promoting high insulation and　airtightness of buildings, the reduction of energy consumption for the operation of single building has been successful. However, when it comes to a lot of blocks as an urban scale, it is still extremely hot in summer, and it is difficult to deal with as a reality. One measure to address such issues is to make the building coating be high reflection. Until now, the research that is only improving the albedo of the building coating has been considered regardless of reflective directional characteristics of building coatings. Thus, building coating materials with retro-reflective directional characteristics have been developed and studied.

Selected publications and works

★. Jihui Yuan*, Shingo Masuko, Yasuhiro Shimazaki, Toshio Yamanaka, Tomohiro Kobayashi. Evaluation of outdoor thermal comfort under different building external-wall-surface with different reflective directional properties using CFD analysis and model experiment. Building and Environment, Volume 207, Part B, January 2022, 108478 (IF: 6.456; SCIE /JCR-Q1(Top Journal))
★. Jing Wang, Shuhan Liu, Xi Meng, Weijun Gao, Jihui Yuan*. Application of retro-reflective materials in urban buildings: A comprehensive review. Energy and Buildings, Vol.247, 15 September 2021, 111137　(IF: 5.897; SCIE /JCR-Q1)
★. Jihui Yuan*, Craig Farnham, Kazuo Emura. Evaluation of retro-reflective properties and upward to downward reflection ratio of glass bead retro-reflective material using a numerical model, Urban Climate, 2021, Vol.38, 100875, https://doi.org/10.1016/j.uclim.2021.100875 (IF: 5.731; SCIE /JCR-Q1)
★. Craig Farnham, Jihui Yuan*. Possible Perception Bias in the Thermal Evaluation of Evaporation Cooling with a Misting Fan, Clean Technol. 2021, 3(1), 183-205; https://doi.org/10.3390/cleantechnol3010011
★. Jihui Yuan*, Craig Farnham, Kazuo Emura. Evaluation of retro-reflective properties and upward to downward reflection ratio of glass bead retro-reflective material using a numerical model, Urban Climate, 2021, Vol.36, 100774 (IF: 5.731; SCIE /JCR-Q1)
★. Jihui Yuan*, Toshio Yamanaka, Tomohiro Kobayashi, Haruto Kitakaze. EVALUATION OF OUTDOOR THERMAL COMFORT UNDER BUILDING EXTERNAL WALL SURFACE MATERIALS WITH DIFFERENT REFLECTIVE DIRECTIONAL CHARACTERISTICS BY CFD, 15th ROOMVENT Conference, 15-17 Feb 2021, Torino, Italy (Virtual)
★. Shaoyu Sheng, Toshio Yamanaka, Tomohiro Kobayashi, Jihui Yuan, Masahiro Katou, Saori Yumino. Improvement Method of Thermal Environmental Near Windows During Heating Period - Outlet Characteristics and CFD Modelling Method of the Slot Line Diffuser, 15th ROOMVENT Conference, 15-17 Feb 2021, Torino, Italy (Virtual)
★. Jihui Yuan*. Investigation of Spatial and Temporal Changes in the Land Surface Albedo for the Entire Chinese Territory, Geosciences, 2020, 10(9), 362; https://doi.org/10.3390/geosciences10090362
★. Jihui Yuan*, Kazuo Emura, Craig Farnham. Analytical model to evaluate the reflective directional characteristics of retro-reflective materials, Energy and Buildings, Volume 223, 15 September 2020, 110169, https://doi.org/10.1016/j.enbuild.2020.110169 (IF: 4.495; SCIE /JCR-Q1(Top Journal))
★. Jihui Yuan*, Craig Farnham, Kazuo Emura. Performance of Retro-Reflective Building Envelope 　
Materials with Fixed Glass Beads, Appl. Sci. 2019, 9(8), 1714; https://doi.org/10.3390/app9081714 (IF: 2.217; SSCI /JCR-Q2)
★. Jihui Yuan*. Impact of Insulation Type and Thickness on the Dynamic Thermal Characteristics of an External Wall Structure, Sustainability, 2018, 10(8), 2835; doi:10.3390/su10082835 (IF: 2.592; SSCI /JCR-Q2)
★. Jihui Yuan*, Kazuo Emura, Craig Farnham. A study on the durability of a glass bead retro-reflective material applied to building facades, Progress in Organic Coatings, 2018, Vol.120, pp.36-48 (IF: 3.420; SCIE /JCR-Q1)
★. Jihui Yuan*, Craig Farnham, Kazuo Emura. Inter-building effect and its relation with highly reflective envelopes on building energy use: Case study for cities of Japan, Atmosphere, 2017, 8(211), 1-13; doi:10.3390/atmos8110211 (IF: 2.046; SCIE /JCR-Q3)
★. Jihui Yuan*, Craig Farnham, Kazuo Emura. Optimum insulation thickness for building exterior walls in 32 regions of China to save energy and reduce CO2 emissions, Sustainability, 2017, 9(10), 1711, 1-13; doi:10.3390/su9101711 (IF: 2.592; SSCI /JCR-Q2)
★. Jihui Yuan*, Kazuo Emura, Craig Farnham. Is urban albedo or urban greening covering more effective for urban microclimate improvement? : A simulation for Osaka, Sustainable Cities and Society, 2017, Vol.32, pp.78-86 (IF: 4.624; SCIE/JCR-Q1)
★. Jihui Yuan*, Kazuo Emura, Craig Farnham, Hideki Sakai. Application of glass beads as retro-reflective facades for urban heat island mitigation: Experimental investigation and simulation analysis, Building and Environment, 2016, Vol.105, pp.140-152 (IF: 4.820; SCIE /JCR-Q1(Top Journal))
★. Jihui Yuan*, Craig Farnham, Kazuo Emura, Md Ashraful Alam. Proposal for optimum combination of reflectivity and insulation thickness of building external walls for annual thermal load in Japan, Building and Environment, 2016, Vol.103, pp.228-237 (IF: 4.820; SCIE /JCR-Q1(Top Journal))
★. Jihui Yuan*, Kazuo Emura, Hideki Sakai, Craig Farnham, Siqiang Lu. Optical analysis of glass bead retro-reflective materials for urban heat island mitigation, Solar Energy, 2016, Vol.132, pp.203-213 (IF: 4.674; SCIE /JCR-Q1)
★. Jihui Yuan*, Craig Farnham, Kazuo Emura. Geometrical-optics analysis of reflective glass beads applied to building coatings, Solar Energy, 2015, Vol.122, pp.997-1010 (IF: 4.674; SCIE /JCR-Q1)
★. Jihui Yuan*, Craig Farnham, Kazuo Emura. A study on the accuracy of determining the retro-reflectance of retro-reflective material by heat balance, Solar Energy, 2015, Vol.122, pp.419-428 (IF: 4.674; SCIE /JCR-Q1)
★. Jihui Yuan*, Craig Farnham, Kazuo Emura. Development of a retro-reflective material as building coating and evaluation on albedo of urban canyons and building heat loads, Energy and Buildings, 2015, Vol.103, pp.107-117 (IF: 4.495; SCIE /JCR-Q1(Top Journal))
★. Jihui Yuan*, Kazuo Emura, Craig Farnham. A method to measure retro-reflectance and durability of retro-reflective materials for building outer walls, Journal of Building Physics, 2014, Vol.38, Issue 6, pp.500-516 (IF: 1.226; SCIE /JCR-Q2)
★. Jihui Yuan*, Kazuo Emura, Hideki Sakai. Evaluation of the Solar Reflectance of Highly Reflective Roofing Sheets Installed on Roofs, Journal of Building Physics, 2012, Vol.37, Issue 2, pp.170-184 (IF: 1.226; SCIE /JCR-Q1)
★. 袁継輝*, 永村一雄, 酒井英樹. 学校屋上での高反射防水シートの反射率の測定, 空気調和・衛生工学会論文集, 2012, No.180, pp.23-30

Keywords

Urban Heat Islands; Highly Reflective Building Coating; Retro-reflective Building Coating; Building Energy Saving

Theme2：Research on weather data used for air-conditioning heat load calculation and building energy conservation

Overview

Hourly weather data for air-conditioning design

　The accuracy of weather data for air-conditioning heat load calculation must be ensured for the purpose of building energy conservation. The standard year weather data is normally created based on the weather data of at least several decades. However, in recent years, since global warming due to climate change is becoming remarkable, the calculated value of the air conditioning heat load using past standard year weather data may be too small or too large, it is not good for energy saving design. Therefore, it is necessary to create new standard weather data.
　Also, in order to make an appropriate proposal for energy conservation in buildings, it is necessary to first understand the energy consumption in the building. In addition, we will try to develop a model for predicting building energy consumption.

Selected publications and works

★. Shaoyu Sheng, Toshio Yamanaka, Tomohiro Kobayashi, Jihui Yuan, Masahiro Katoh. Modeling of supply airflow from slot line diffuser on ceiling for CFD of thermal environment in perimeter zone. Building and Environment, 2022, Vol.213, April 2022, 108884 (IF: 6.456; SCIE /JCR-Q1(Top Journal))
★. Jihui Yuan*, Kazuo Emura, Craig Farnham. Proposal to Refine Solar Radiation of Typical Meteorological Year Database and Evaluation on the Influence of Air-Conditioning Load, Atmosphere 2021, 12(4), 524; https://doi.org/10.3390/atmos12040524 (IF: 2.397; SCIE /JCR-Q3)
★. 前田龍紀, 山中俊夫, 小林知広, 袁継輝, 崔ナレ, 蔵永真理, 上村芙美子, 新宮浩丈. PACを用いた膜天井放射空調の冷暖房性能に関する研究 (第1報) 冷房時における室内温度分布及び省エネ性・空調性能の検討, 空気調和・衛生工学会論文集, 2020, No.284, pp.1-9
★. Zhichao Jiao, Jihui Yuan*, Craig Farnham, Kazuo Emura*. Deviation of Design Air-Conditioning Load based on Weather Database of Reference Weather Year and Actual Weather Year.
Energy and Built Environment, 18 May 2020, https://doi.org/10.1016/j.enbenv.2020.04.010
★. 山澤春菜, 山中俊夫, 桃井良尚, 小林知広, 袁継輝, 伊藤彰悟, 水出喜太郎, 藤井拓郎. 高層建築における自然換気用ソーラーチムニーの換気性能検証手法に関する研究―実建物を対象とした自然換気量測定に基づく換気性能検証事例―, 空気調和・衛生工学会論文集, 2019, No.269, pp.27-34
★. Jihui Yuan*, Craig Farnham, Chikako Azuma, Kazuo Emura. Predictive artificial neural network models to forecast the seasonal hourly electricity consumption for a University Campus, Sustainable Cities and Society, 2018, Vol.42, pp.82-92 (IF: 4.624; SCIE/JCR-Q1)
★. Jihui Yuan*, Kazuo Emura, Craig Farnham，Siqiang Lu, Chao He. The creation of weather data for AC design using two weather indices for Osaka, Energy and Buildings, 2017, Vol.134, pp.248-258 (IF: 4.495; SCIE/JCR-Q1(Top Journal))
★. Jihui Yuan*, Kazuo Emura, Craig Farnham. Development and application of a simple BEMS to measure energy consumption of buildings, Energy and Buildings, 2015, Vol.109, pp.1-11 (IF: 4.495; SCIE/JCR-Q1(Top Journal))
★. Jihui Yuan*, Kazuo Emura, Craig Farnham. An Investigation of Power Consumption in Osaka City University Sugimoto Campus, Advanced Civil, Urban and Environmental Engineering, WIT Transactions on the Built Environment, 2014, Vol.157, pp.649-657 (ISSN: 1743-3509)
★. 袁継輝*, 永村一雄, Craig Farnham. 中国・上海のCSWD標準年気象データの日射天空成分比の改良, 日本建築学会技術報告集, 2015, Vol.21, No.48, pp.693-696
★. Craig Farnham, Jihui Yuan, Kazuo Emura, Md Ashraful Alam, Takeo Mizuno. CFD Evaluation of Experimental Measurements of Oscillating Mist Fan Cooling in a Large Indoor Space, Proceedings of the 16th IBPSA Conference, pp. 2041-2049, Rome, Italy, Sep. 2-4, 2019. https://doi.org/10.26868/25222708.2019.211096

Keywords

Standard Yearly Weather Data, Air-conditioning Heat Loads, Energy conservation

Title of class

・Environment Experiment (@TUT)
・Science and Engineering Experiment (@TUT)
・Residential Environment Engineering-Ⅱ (@OCU)

Others (Awards, Committees, Board members)

・【Other research content】：Indoor ventilation, Natural ventilation, etc.
・【Awards】：Excellent paper award in "International Conference on CUEE”
・【Committee member】
→ Member in Air Environment Committee of AIJ-Kinki
→ Member in International Exchange Committee of SHASE-Kinki
・【Academic activities, Lectures, etc】
　→【Editor Board】：Guest-Editor of Journals (Atmosphere, Energy and Built Environment, etc)
　→【Reviewer】：Review for International Journals（Energy Build., Appl. Energy, etc）
→ Oral prensentation in CLIMA2019（May 2019＠Bucharest, Romania）
→ Oral presentation in International Symposium（Dec. 2018＠Tianjin, China）
→ 5th International Multi-Conference on Engineering and Technology Innovation (Oct. 2016＠Tainan, Taiwan)
→ 5th Environmental Toxicology and Ecological Risk Assessment (Sep. 2016@Phoenix, USA)
→ Presentation in Urban Transitions Global Summit 2016 by Elsevier (Sep. 2016＠Shanghai, China)
→ Poster presentation in Academic Symposim between Japan and Korea（Mar. 2015＠Osaka, Japan）
→ Oral presentation at "East Lake Forum” in HUST（Dec. 2014@Wuhan, China）
→ 2nd Asia Conference of IBPSA（Nov. 2014＠Nagoya, Japan）
→ Presentation at "Development of Postdoctor and Carrier"（Nov. 2014＠Osaka, Japan）
→ The 10th International Symposium of Architecture in Asia （Oct. 2014＠Hangzhou, China）
→ The 9th International Symposium of Architecture in Asia（Oct. 2012＠Gwangju, Korea）
→ Booth of OCU at Asia Shanghai Industrial Expo（Nov. 2011＠Shanghai, China）