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  • 1.
    Cao, Guoqing
    et al.
    Tianjin University.
    Tu, Guangbei
    Tianjin University.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Study of optimum horizontal shading device dimensions for energy saving in residential buildings2006In: Taiyangneng Xuebao, Vol. 27, no 1, p. 96-100Article in journal (Refereed)
  • 2.
    Chen, Ailu
    et al.
    Nanyang Technological University.
    Cao, Qingliang
    Nanyang Technological University.
    Zhou, Jin
    Nanyang Technological University.
    Nazaroff, William
    University of California, Berkeley.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Chang, Wei-Chung
    Nanyang Technological University.
    Indoor/outdoor pollutant relationships in an air-conditioned room during and after the 2013 haze in Singapore2014In: Indoor Air 2014, Hong Kong : exploring indoor air sciences for a sustainable built environment: proceedings of the 13th International Conference on Indoor Air Quality and Climate, July 7-July 12, 2014 / [ed] Yuguo Li and Xinyan Yang, 2014Conference paper (Other academic)
  • 3. Chen, Ailu
    et al.
    Cao, Qingliang
    Zhou, Jin
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Chang, Wei-Chung
    Nazaroff, William
    Indoor and outdoor particles in an air-conditioned building during and after the 2013 haze in Singapore2016In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 99, p. 73-81Article in journal (Refereed)
    Abstract [en]

    Particles released from biomass burning can contribute to severe air pollution. We monitored indoor and outdoor particles in a mechanically ventilated and air-conditioned building during and after the 2013 haze event in Singapore. Continuous monitoring of time-and size-resolved particles in the diameter range 0.01–10 μm was conducted for two weeks in each sampling campaign. During the haze event, the averaged size-resolved outdoor particle volume concentrations (dV/d(logDp)) for diameters larger than 0.3 μm were considerably higher than those during the post-haze days (9–185 μm3 cm−3versus 1–35 μm3 cm−3). However, the average number concentration of particles with diameters in the range 10–200 nm was substantially lower on the hazy days than on the post-haze days (11,400 to 14,300 particles cm−3 for hazy days, versus an average of 23,700 particles cm−3 on post-haze days). The building mechanical ventilation system, equipped with MERV 7 filters, attenuated the penetration and persistence of outdoor particles into the monitored building. Indoor particle concentrations, in the diameter ranges 0.3–1.0 μm and 1.0–2.5 μm, closely tracked the corresponding patterns of outdoor particle concentrations. For particles in the size range 0.01–1.0 μm, the size-resolved mean indoor/outdoor (I/O) ratios were in the range 0.12–0.65 with the highest mean I/O ratio at 0.3 μm (0.59 in AC on mode and 0.64 in AC off mode). The air conditioning and mechanical ventilation system with MERV 7 filters provided low single-pass removal efficiency (less than ∼ 30%) for particles with diameters of 0.01–1.0 μm. During the haze, for particles larger than ∼0.2 μm, lower I/O ratios and higher removal efficiencies occurred with the air conditioning operating as compared to with mechanical ventilation only. This observation suggests the possibility of particle loss to air conditioning system surfaces, possibly enhanced by thermophoretic or diffusiophoretic effects.

  • 4.
    Cheng, Xiaogang
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China; School of Electrical Engineering and Computer Science, Royal Institute of Technology, Stockholm, Sweden.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi'an, China.
    Liu, Guoqing
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    A total bounded variation approach to low visibility estimation on expressways2018In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 18, no 2, article id 392Article in journal (Refereed)
    Abstract [en]

    Low visibility on expressways caused by heavy fog and haze is a main reason for traffic accidents. Real-time estimation of atmospheric visibility is an effective way to reduce traffic accident rates. With the development of computer technology, estimating atmospheric visibility via computer vision becomes a research focus. However, the estimation accuracy should be enhanced since fog and haze are complex and time-varying. In this paper, a total bounded variation (TBV) approach to estimate low visibility (less than 300 m) is introduced. Surveillance images of fog and haze are processed as blurred images (pseudo-blurred images), while the surveillance images at selected road points on sunny days are handled as clear images, when considering fog and haze as noise superimposed on the clear images. By combining image spectrum and TBV, the features of foggy and hazy images can be extracted. The extraction results are compared with features of images on sunny days. Firstly, the low visibility surveillance images can be filtered out according to spectrum features of foggy and hazy images. For foggy and hazy images with visibility less than 300 m, the high-frequency coefficient ratio of Fourier (discrete cosine) transform is less than 20%, while the low-frequency coefficient ratio is between 100% and 120%. Secondly, the relationship between TBV and real visibility is established based on machine learning and piecewise stationary time series analysis. The established piecewise function can be used for visibility estimation. Finally, the visibility estimation approach proposed is validated based on real surveillance video data. The validation results are compared with the results of image contrast model. Besides, the big video data are collected from the Tongqi expressway, Jiangsu, China. A total of 1,782,000 frames were used and the relative errors of the approach proposed are less than 10%.

  • 5.
    Cheng, Xiaogang
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. Nanjing Univ Posts & Telecommun, Coll Telecommun & Informat Engn, Nanjing, Jiangsu, Peoples R China; Royal Inst Technol, Sch Comp Sci & Commun, Stockholm, Sweden.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Liu, Guoqing
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Li, Haibo
    A variational approach to atmospheric visibility estimation in the weather of fog and haze2018In: Sustainable cities and society, ISSN 2210-6707, Vol. 39, p. 215-224Article in journal (Refereed)
    Abstract [en]

    Real-time atmospheric visibility estimation in foggy and hazy weather plays a crucial role in ensuring traffic safety. Overcoming the inherent drawbacks with traditional optical estimation methods, like limited sampling volume and high cost, vision-based approaches have received much more attention in recent research on atmospheric visibility estimation. Based on the classical Koschmieder's formula, atmospheric visibility estimation is carried out by extracting an inherent extinction coefficient. In this paper we present a variational framework to handle the nature of time-varying extinction coefficient and develop a novel algorithm of extracting the extinction coefficient through a piecewise functional fitting of observed luminance curves. The developed algorithm is validated and evaluated with a big database of road traffic video from Tongqi expressway (in China). The test results are very encouraging and show that the proposed algorithm could achieve an estimation error rate of 10%. More significantly, it is the first time that the effectiveness of Koschmieder's formula in atmospheric visibility estimation was validated with a big dataset, which contains more than two million luminance curves extracted from real-world traffic video surveillance data.

  • 6. Cheng, Xiaogang
    et al.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Liu, Guoqing
    Olofsson, Thomas
    Li, Haibo
    Atmospheric visibility detection based on total variation and piecewise stationary time series for fog and haze weather2018In: Sustainable cities and society, ISSN 2210-6707Article in journal (Refereed)
  • 7.
    Cheng, Xiaogang
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Liu, Guoqing
    Li, Haibo
    A pilot study of online non-invasive measuring technology based on video magnification to determine skin temperature2017In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 121, p. 1-10Article in journal (Refereed)
    Abstract [en]

    Much attention was paid on human centered design strategies for environmental control systems of indoor built environments. The goal is to achieve thermally comfortable, healthy and safe working or living environments in energy efficient manners. Normally building Heating, Ventilation and Air Conditioning (HVAC) systems have fixed operating settings, which can't satisfy human thermal comfort requirements under transient and non-uniform indoor thermal environments. Therefore, human thermal physiology signal such as skin temperature, which can reflect human body thermal sensation, has to be measured over time. Several trials have been performed by minimizing measuring sensors such as i-Button and mounting measuring sensors into wearable devices such as glasses. Infrared thermography technology has also been tried to achieve non-invasive measurements. However, it would be much more convenient and feasible if normal computer camera could record images, which could be used to obtain human thermal physiology signals. In this study, skin temperature of hand back, which has a high density of blood vessels and is normally not covered by clothing, was measured by i-button sensors. Images recorded by normal camera were amplified to analyzing skin temperature variation, which are impossible to see with naked eyes. The agreement between i-button sensor measuring results and image magnification results demonstrated the possibility of non-invasive measuring technology by image magnification. Partly personalized saturation-temperature model (T = 96.5 × S + bi) can be used to predict skin temperatures for young East Asia females.

  • 8. Cheng, Yuanda
    et al.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China.
    Lin, Zhang
    Yang, Jinming
    Jia, Jie
    Du, Zhenyu
    Cooling load calculation methods in spaces with stratified air: a brief review and numerical investigation2018In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 165, p. 47-55Article, review/survey (Refereed)
    Abstract [en]

    Due to vertically thermal stratification in indoor spaces, the cooling load calculation is always a challenge in the design of stratified air distribution systems (STRAD), which in turn is crucial to determine the supply air flow rate and the cooling load to be removed by the air conditioning system. In this paper, several cooling load calculation methods, developed in the past 20 years and focused on STRAD systems, were briefly reviewed. It attempts to clarify these methods in terms of their advantages, limitations and suitable ranges of applications. Furthermore, series of numerical simulations with a total number of 56 cases were conducted, and the applications of a novel cooling load calculation method in STRAD systems were investigated. The reliability of the method was validated for STRAD systems with separated locations of return and exhaust grilles, when adopted in three typical spaces with different building heights, namely a small office, a large terraced classroom and a terminal building. Databases of effective cooling load factors (ECLF;) for different heat sources distributed in the three spaces were obtained and presented, which can be conveniently used to calculate cooling loads. In addition, the influences of return grill height on the occupied zone cooling load as well as the energy saving potentials of STRAD systems were also clarified. The results presented in this paper are helpful for the design and optimization of STRAD systems.

  • 9. Deng, Na
    et al.
    He, Guansong
    Gao, Yuan
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Zhao, Jun
    He, Shunming
    Tian, Xue
    Comparative analysis of optimal operation strategies for district heating and cooling system based on design and actual load2017In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 205, p. 577-588Article in journal (Refereed)
    Abstract [en]

    Computational load significantly influences energy and cost savings when developing an operation strategy for a district heating and cooling system. In this study, a model was identified to study the effects of the difference between design load and actual load on an optimal operation strategy. The established model is strongly dependent on the economy principle, and the proposed optimal strategy could achieve a dynamic balance between the users' load and the system energy supply. This model was validated at 30% load rate, which demonstrated an obvious cost saving of 63.6% under the actual load and 42.2% under the design load. Based on the current strategy, the optimal strategy at different load rates was analyzed with respect to two characteristics of each subsystem: energy outputs and operation costs. Furthermore, in the optimal strategy, changes in total operation costs and cost savings rates under different load rates are also discussed. The results showed that, when the load rate was changed from 30 to 75%, the savings rates based on the design load were 42.2, 17.9, 2.5, and 12.6%, and the savings rates based on the actual load were 63.6, 49.8, 34.3, and 25.7%, respectively. Based on the actual load, the energy savings advantage of the optimal operation strategy could be maximized, in particular, during the initial stage of project construction. Furthermore, the commercial software MATLAB was used for programming and calculations. The simulation results indicated that the application of the combined cooling, heating, and power system could significantly improve the cost-effectiveness.

  • 10. Dong, Jiankai
    et al.
    Zhang, Long
    Deng, Shiming
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Huang, Shun
    An experimental study on a novel radiant-convective heating system based on air source heat pump2018In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 158, p. 812-821Article in journal (Refereed)
    Abstract [en]

    Air source heat pump (ASHP) has been widely applied to many parts of the world due to its simple structure and low initial cost. To save energy consumed for spacing heating and enhance the indoor thermal environment, improving the performances of ASHP has become one of the research focus in the relevant field. Currently, the most conventional heating terminal of ASHP system for spacing heating is finned tube heat exchanger coupled with air fan, which may cause strong draught sensation and dry eye problem and make users feel uncomfortable during convective heating. On the other hand, radiant heating is attracting more and more attention due to its comfortable indoor thermal environment. In this paper, a novel radiant-convective heating terminal was presented and coupled into an ASHP system. Both the operating characteristics and heating performances of the novel system were experimentally investigated. The experimental results showed that the novel system took about 28 min to enter a steady operating stage, during which the radiant panel surface temperature and outlet air temperature for the novel heating terminal, and COP of the novel system were 40.9 degrees C, 32.1 degrees C, and 3.11, respectively, under a standard heating condition. In addition, all parameters mentioned above saw a linear increase when the outdoor air temperature increased from -4.0 to 10.0 degrees C, and their respective rising rates were 0.41 degrees C, 0.28 degrees C and 0.04 per increased outdoor air temperature. Furthermore, the experimental results also demonstrated that adjusting the indoor air flow rate could effectively allocate the amount of heat generated by different heat transfer modes, which may have significant effects on the indoor thermal environment.

  • 11.
    He, Yaodong
    et al.
    Tianjin Polytechnic University.
    Wang, Shuzhong
    Tianjin Eco Energy Consultant Company.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Ji, Haiyan
    Hebei University of Technology.
    He, Qing
    Tenio Architectural Design and Consultant Company.
    Review of geothermal heat pump technology in China in the past ten years2012In: Proceedings of the 18th National Academy Conference on Heating, Ventilation, Air-conditioning and Refrigeration (Chinese Conference), 2012Conference paper (Refereed)
  • 12.
    Huang, Baomin
    et al.
    The 3rd Railway Survey and Design Institute.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Application of simulation technologies in green building design2012In: Journal of HV & AC (Chinese Journal), Vol. 42, no 2, p. 75-78Article in journal (Refereed)
  • 13. Kabanshi, Alan
    et al.
    Ameen, Arman
    Hayati, Abolfazl
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Cooling energy simulation and analysis of an intermittent ventilation strategy under different climates2018In: Energy Journal, ISSN 0195-6574, E-ISSN 1944-9089, Vol. 156, p. 84-94Article in journal (Refereed)
    Abstract [en]

    Energy use on heating, ventilation and air conditioning (HVAC) accounts for about 50% of building energy use. To have a sustainable built environment, energy efficient ventilation systems that deliver good indoor environmental quality are needed. This study evaluates the cooling energy saving potential of a newly proposed ventilation system called Intermittent Air Jet Strategy (IAJS) and compares its performance against a mixing ventilation (MV) system in a classroom located in three cities with different climates, Singapore with 'hot and humid', Ahvaz with 'hot and dry' and Lisbon with "moderate" climate. The results show a significant reduction of cooling energy need and flexibility in control strategies with IAJS as a primary system in hot and humid climates like Singapore. Hot and dry climate with short cool periods like Ahvaz show possible application and considerable energy savings with IAJS as a primary system under optimized variable setpoints, but moderate climates have an increased risk of occupant discomfort likely due to increased draft especially during the cool season. Thus, IAJS as a secondary system that operates only during cooling season may be conducive for moderate climates like Lisbon. Additionally, the results show that supply fan energy savings can also be realised if well implemented.

  • 14. Kabanshi, Alan
    et al.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Sörqvist, Patrik
    Sandberg, Mats
    Occupants’ perception of airmovements and air quality in a simulated classroom with an intermittent air supply system2017In: Indoor + Built Environment, ISSN 1420-326X, E-ISSN 1423-0070Article in journal (Refereed)
  • 15. kabanshi, Alan
    et al.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Wigö, Hans
    Sandberg, Mats
    Energy simulation andanalysis of intermittent air jets system under different climates.2017Conference paper (Refereed)
  • 16.
    Lou, Xiaojun
    et al.
    Tianjin University.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    You, Shijun
    Tianjin University.
    Investigation of energy consumption of high-rise buildings in Tianjin2000In: Energy Efficiency in Building, Vol. 32, p. 27-29Article in journal (Refereed)
  • 17.
    Ohlsson, Anders
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Ekblad, Alf
    Örebro universitet.
    Boman, Christoffer
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Nyström, Robin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Stable carbon isotope labelled carbon dioxide as tracer gas for air change rate measurement in a ventilated single zone2017In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 115, p. 173-181Article in journal (Refereed)
    Abstract [en]

    Carbon dioxide (CO2) has often been used as tracer gas for measurement of the air change rate l (h1 ) in buildings. In such measurements, a correction is required for the presence of indoor CO2, which commonly consists of atmospheric CO2 mixed with human respired CO2. Here, 13C isotope-labelled CO2 was employed as tracer gas, and cavity ring-down spectroscopy (CRDS) was used for simultaneous measurement of the two isotope analogues 12CO2 and 13CO2. This enabled the simultaneous measurement of the 13CO2 tracer gas, with correction for background 13CO2, and the concentration of indoor CO2, allowing for presence of occupants. The background correction procedure assumes that the isotope delta of the background indoor CO2 equals dB ¼ 19‰, based on the prior information that the carbon isotope ratio RB ¼ 13C/12C of all carbon in the bio-geosphere of earth is in the interval 0.010900 < RB < 0.011237. Evidence supported that l could be accurately measured, using the new 13CO2 tracer method, even when the background 13CO2 concentration varied during the measurement time interval, or when the actual dB value differed from the assumed value. The measurement uncertainty for l was estimated at 3%. Uncertainty in l due to uncertainty in RB, uRB(l), was estimated to increase with a decreasing amount of 13CO2 tracer. This indicated that at least 4 ppm tracer must be used, in order to obtain uRB(l)/l < 2%. The temporal resolution of the l measurement was 1.25/l h.

  • 18.
    Qi, Chengyi
    et al.
    Hebei University of Technology.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Yang, Hua
    Hebei University of Technology.
    Jin, Fengyun
    Hebei University of Technology.
    Tham, Kwok Wai
    National University of Singapore.
    Numerical study of personalized ventilation application in tollway charging station2007In: Proceedings of the 5th International Symposium on Heating, Ventilation and Air Conditioning, 2007Conference paper (Refereed)
  • 19. Schiavon, Stefano
    et al.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Chang, Wei-Chung
    Nazaroff, William
    Effect of air temperature and air movement on thermal comfort for tropically acclimatized persons2015Conference paper (Refereed)
  • 20. Schiavon, Stefano
    et al.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore; Berkeley Education Alliance for Research in Singapore, Singapore.
    Donner, Yoni
    Chang, Wei-Chung
    Nazaroff, William
    Thermal comfort, perceived air quality and cognitive performance when personally controlled air movement is used by tropically acclimatized persons2017In: Indoor Air, ISSN 0905-6947, E-ISSN 1600-0668, Vol. 27, no 3, p. 690-702Article in journal (Refereed)
    Abstract [en]

    In a warm and humid climate, increasing the temperature set point offers considerable energy benefits with low first costs. Elevated air movement generated by a personally controlled fan can compensate for the negative effects caused by an increased temperature set point. Fifty-six tropically acclimatized persons in common Singaporean office attire (0.7 clo) were exposed for 90 minutes to each of five conditions: 23, 26, and 29°C and in the latter two cases with and without occupant-controlled air movement. Relative humidity was maintained at 60%. We tested thermal comfort, perceived air quality, sick building syndrome symptoms, and cognitive performance. We found that thermal comfort, perceived air quality, and sick building syndrome symptoms are equal or better at 26°C and 29°C than at the common set point of 23°C if a personally controlled fan is available for use. The best cognitive performance (as indicated by task speed) was obtained at 26°C; at 29°C, the availability of an occupant-controlled fan partially mitigated the negative effect of the elevated temperature. The typical Singaporean indoor air temperature set point of 23°C yielded the lowest cognitive performance. An elevated set point in air-conditioned buildings augmented with personally controlled fans might yield benefits for reduced energy use and improved indoor environmental quality in tropical climates.

  • 21.
    Sekhar, Chandra
    et al.
    National University of Singapore.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    CFD modeling of a compartmented cooling coil for demand ventilation to achieve enhanced indoor air quality2005In: Proceedings of the 10th International Conference on Indoor Air Quality and Climate (Indoor Air 2005), 2005Conference paper (Refereed)
  • 22.
    Sekhar, Chandra
    et al.
    National University of Singapore.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Tham, Kwok Wai
    National University of Singapore.
    Cheong, Kok Wai
    National University of Singapore.
    IAQ and energy performance of the newly developed single coil twin fan air-conditioning and air distribution system-results of a field trial2007In: Proceedings of the REHVA World Congress Clima 2007 WellBeing Indoors, 2007Conference paper (Refereed)
  • 23.
    Sun, Hejiang
    et al.
    Tianjin University.
    Li, Weijuan
    Tianjin University.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Numerical simulation of a novel personalized   air distribution system for commercial aircraft cabins2012In: Journal of Tianjin University (Chinese Journal), Vol. 46, no 1, p. 16-21Article in journal (Refereed)
  • 24. Wang, Faming
    et al.
    Xu, Pengjun
    Ke, Ying
    Lin, Li-Yen
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Novel body mapping Nanoporous PE clothing for improving thermal comfort of office workers in indoor environments2017Conference paper (Refereed)
  • 25. Wang, Jinliang
    et al.
    Chow, Tin-tai
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Zhang, Hui
    Study on the impact of circulating nurse walking on bacteria-carrying particles distributions in operating theatre2016Conference paper (Refereed)
  • 26.
    Wang, Shuzhong
    et al.
    Tianjin Eco Energy Consultant Company.
    Yang, Bin
    Tianjin E.CO Energy Technology Consultation Co.Ltd.,Tianjin 300384,China; School of Energy and Environment, Hebei University of Technology,Tianjin 300401,China.
    He, Yaodong
    Tianjin Polytechnic University.
    Ji, Haiyan
    Hebei University of Technology.
    He, Qing
    Tenio Architectural Design and Consultant Company.
    Case study of green building design for one primary school in Sino Singapore Tianjin Eco-city2012In: Building Energy Efficiency (Chinese Journal), ISSN 1673-7237, Vol. 40, no 8, p. 28-30Article in journal (Refereed)
  • 27.
    Wei, Qiaoli
    et al.
    Tianjin University.
    Zhang, Huan
    Tianjin University.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    You, Shijun
    Tianjin University.
    Design and energy-saving potentiality of exterior shade on southern windows for residential buildings2004In: HV & AC, Vol. 34, no 12, p. 102-104Article in journal (Refereed)
  • 28.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Numerical study of the influence of moving person on ceiling mounted personalized ventilation performance in tropics2007In: Proceedings of the International Conference on Indoor Climate of Buildings, 2007Conference paper (Refereed)
  • 29.
    Yang, Bin
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Pilot study of simulation tools for single green building design2012In: Proceedings of the 4th Workshop of Renovation Technologies for Established Buildings (Chinese Conference), 2012Conference paper (Refereed)
  • 30.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    He, Yaodong
    Tianjin Polytechnic University.
    Ji, Haiyan
    Hebei University of Technology.
    Wang, Shuzhong
    Tianjin Eco Energy Consultant Company.
    One kind of personalized environmental control system for highway toll gate2012Patent (Other (popular science, discussion, etc.))
  • 31.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    He, Yaodong
    Tianjin Polytechnic University.
    Ji, Haiyan
    Hebei University of Technology.
    Wang, Shuzhong
    Tianjin Eco Energy Consultant Company.
    He, Qing
    Tenio Architectural Design and Consultant Company.
    Application of simulation technologies on optimizing green building design2012In: Proceedings of the 18th National Academy Conference on Heating, Ventilation, Air-conditioning and Refrigeration (Chinese Conference), 2012Conference paper (Refereed)
  • 32.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Lin, Zhang
    Li, Angui
    Advanced ventilation systems − theory, practice, limitations and solutions (Editorial)2018In: Trends in Civil Engineering and Material ScienceArticle in journal (Refereed)
  • 33.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Melikov, Arsen
    Technical University of Denmark.
    Sekhar, Chandra
    National University of Singapore.
    Cooling effect of ceiling mounted personalized ventilation system2008In: Proceedings of the 11th International Conference on Indoor Air Quality and Climate (Indoor Air 2008), 2008Conference paper (Refereed)
  • 34.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Melikov, Arsen
    Technical University of Denmark.
    Sekhar, Chandra
    National University of Singapore.
    Performance evaluation of ceiling mounted personalized ventilation system2009In: ASHRAE Transactions, ISSN 0001-2505, Vol. 115, no 2, p. 395-406Article in journal (Refereed)
  • 35.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    A questionnaire survey on sleeping environment conditioned by different cooling modes in multistory residential buildings of Singapore2017In: Indoor + Built Environment, ISSN 1420-326X, E-ISSN 1423-0070, Vol. 26, no 1, p. 21-31Article in journal (Refereed)
    Abstract [en]

    A good sleep environment is essential to maintain a person's health and daily working performance. How to create comfortable and healthy sleep environments with less energy use is worth exploring. Findings, based on one questionnaire survey on sleep environments conditioned by different cooling modes have been reported. The study investigated the use of different cooling devices in relation to the effect on sleep. Human responses to thermal environments and air quality created by different cooling modes were also studied. Totally 229 completed questionnaires were statistically analysed. The results show that most of the respondents prefer to use air conditioner 3–6 months in a year with relatively low temperature settings especially for respondents living below fifth floor. It is better to choose relatively high temperature settings to reduce air conditioning intensity especially for elders and outdoor workers, which can not only avoid cold thermal discomfort but also reduce electric energy use. For elders, outdoor workers and persons living in higher floor levels, there was an increase usage of electrical fans or natural ventilation. Thermal comfort can be maintained by raised air movement and the perceived air quality could improve obviously by introducing outdoor air, which would create a good sleep environment to ensure sleep quality.

  • 36.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    A questionnaire survey on sleeping environment under different cooling modes in multi-story residential buildings of Singapore2015Conference paper (Refereed)
    Abstract [en]

    Good sleeping environment is important to guarantee person’s health and performance. How to create comfortable and healthy sleeping environment with less energy use is worth exploring. Findings, based on one questionnaire survey on sleeping environment conditioned by different cooling modes (split system air conditioning unit, different kinds of electrical fans or purely natural ventilation), were reported. The study aimed to investigate human factors such as bedding and sleepwear use, using habits of different cooling devices, and human responses to thermal environment and air quality created by different cooling modes. 290 effective questionnaires were collected between June 2013 and May 2014, which were statistically analyzed. The results showed that most of the respondents prefer to use air conditioner for certain number of hours with relatively low temperature settings especially for respondents living below 5th floor. For respondents living above 10th floor, the number of hours using electrical fan or purely natural ventilation increase and their perceived air quality improve obviously. Respondents, who work outdoors during daytime, use less time for air conditioner with relatively high temperature setting. Elder respondents above 55 seldom use air conditioner.

  • 37.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Outdoor thermal bioclimatic environments and human behavior pattern under subarctic climate of north Sweden: a pilot study in Umeå2016In: 14th International Conference on Indoor Air Quality and Climate (INDOOR AIR 2016), International Society of Indoor Air Quality and Climate (ISIAQ) , 2016, Vol. 6, p. 3745-Conference paper (Refereed)
  • 38.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Nair, Gireesh
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Kabanshi, Alan
    Outdoor thermal comfort under subarctic climate of north Sweden: a pilot study in Umeå2017In: Sustainable cities and society, ISSN 2210-6707, Vol. 28, p. 387-397Article in journal (Refereed)
    Abstract [en]

    Outdoor microclimate is important to determine the quality of outdoor spaces. Swedish people cherish summer period and prefer more outdoor activities in summer because of long winter with harsh outdoor environments. People in urban areas use parks for recreation and outdoor activities frequently in summer. Under subarctic climate, limited studies have been performed to explore the effect of microclimate environments on usage of outdoor spaces such as parks. The study explored the relationship of microclimate environments, park use and human behavioral patterns in urban area of Umeå, Sweden, which is under subarctic climate. Observations of naturally occurring behavior were recorded. Structured interviews, based on specially designed questionnaires, were performed during July to August in 2015. Measurements of objective parameters for microclimate environments, including air dry bulb temperature, relative humidity, wind speed, solar radiation and globe temperature, were performed. Human subjective responses from the questionnaire survey were compared with objectively measured results. 49% of local persons still prefer higher solar radiation even under "slightly warm" Thermal Sensation Vote (TSV), which reflects their high expectation to solar radiation. Local persons in Umeå, who expose themselves to a wider climate, are more adapted to subarctic climate than non-local persons. Practical implications: The pilot study demonstrated that wind attenuation together with strong sunshine can improve Thermal Sensation Vote (TSV), which could be realized by specially designed hump terrain for attenuating wind without shading effects. The results will be used for optimizing design of urban outdoor environments such as parks under subarctic or arctic climate.

  • 39.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, China.
    Olofsson, Thomas
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Wang, Faming
    Lu, Weizhuo
    Thermal comfort in primary school classrooms: A case study under subarctic climate area of Sweden2018In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 135, p. 237-245Article in journal (Refereed)
    Abstract [en]

    Limited studies were focused on primary school buildings especially under subarctic climate. Thermal comfort of children was assumed to be similar as that of adults, which may cause inaccuracy. To fill data blank and enrich global database, a field study was performed from late fall 2016 to early spring 2017 covering whole heating period in north part of Sweden. Indoor CO2 concentration was continuously monitored to evaluate indoor ventilation. Thermal comfort related parameters were continuously measured and predicted mean vote (PMV) was calculated. Subjective questionnaire surveys were performed every week except holidays. Subjective thermal sensation value (TSV) was always higher than objective PMV, which reflected thermal adaptation. The thermal adaptation became not obvious in middle and late winter because of long term exposure to heating environments. Heating system should be intensified gradually in early heating period, operated based on actual outdoor climate instead of experience in middle and late heating periods, extended under part load operation in early spring if necessary. The new 13-point TSV scale was pointed out by other researchers and tested inthis study, which can explore tiny TSV deviations from thermally neutral status and reflect more accurate thermal sensations.

  • 40.
    Yang, Bin
    et al.
    Berkeley Education Alliance for Research in Singapore, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, Singapore.
    Schiavon, Stefano
    University of California, Berkeley.
    Sekhar, Chandra
    National University of Singapore.
    Cheong, David
    National University of Singapore.
    Tham, Kwok Wai
    National University of Singapore.
    Nazaroff, William W
    University of California, Berkeley.
    Cooling efficiency of a brushless direct current stand fan2015In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 85, p. 196-204Article in journal (Refereed)
    Abstract [en]

    The idea of far transfer effects in the cognitive sciences has received much attention in recent years. One domain where far transfer effects have frequently been reported is music education, with the prevailing idea that music practice entails an increase in cognitive ability (IQ). While cross-sectional studies consistently find significant associations between music practice and IQ, randomized controlled trials, however, report mixed results. An alternative to the hypothesis of cognitive transfer effects is that some underlying factors, such as shared genes, influence practice behaviour and IQ causing associations on the phenotypic level. Here we explored the hypothesis of far transfer within the framework of music practice. A co-twin control design combined with classical twin-modelling based on a sample of more than 10,500 twins was used to explore causal associations between music practice and IQ as well as underlying genetic and environmental influences. As expected, phenotypic associations were moderate (r = 0.11 and r = 0.10 for males and females, respectively). However, the relationship disappeared when controlling for genetic and shared environmental influences using the co-twin control method, indicating that a highly practiced twin did not have higher IQ than the untrained co-twin. In line with that finding, the relationship between practice and IQ was mostly due to shared genetic influences. Findings strongly suggest that associations between music practice and IQ in the general population are non-causal in nature. The implications of the present findings for research on plasticity, modularity, and transfer are discussed.

  • 41.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Schiavon, Stefano
    University of California, Berkeley.
    Sekhar, Chandra
    National University of Singapore.
    Cheong, Kok Wai
    National University of Singapore.
    Tham, Kwok Wai
    National University of Singapore.
    Nazaroff, William
    University of California, Berkeley.
    Performance evaluation of an energy efficient stand fan2014In: Indoor Air 2014, Hong Kong : exploring indoor air sciences for a sustainable built environment: proceedings of the 13th International Conference on Indoor Air Quality and Climate, July 7-July 12, 2014 / [ed] Yuguo Li and Xinyan Yang, 2014Conference paper (Refereed)
  • 42.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Sekhar, Chandra
    National University of Singapore.
    An innovative fresh air supply method for decoupled ventilation strategy2006In: Proceedings of the 8th International Healthy Buildings Conference and Exhibition (Healthy Buildings 2006), 2006Conference paper (Refereed)
  • 43.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Sekhar, Chandra
    National University of Singapore.
    CFD modeling and experimental validation of a compartmented cooling coil under dehumidifying conditions2006In: Proceedings of the 8th International Healthy Buildings Conference and Exhibition (Healthy Buildings 2006), 2006Conference paper (Refereed)
  • 44.
    Yang, Bin
    et al.
    Hebei University of Technology, China.
    Sekhar, Chandra
    National University of Singapore.
    Conventional and ceiling mounted personalized ventilation-the dynamic effects of a moving person on personal exposure effectiveness2014In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 935, p. 333-336Article in journal (Refereed)
    Abstract [en]

    Ceiling mounted personalized ventilation (PV) aims to provide clean outdoor air into breathing zone of occupants directly without affecting indoor aesthetics. High momentum, at outlet of PV air terminal device (ATD), is utilized in order to avoid inducing more ambient air and let more personalized air come into breathing zone. In steady state, its performance depends much on the ceiling mounted ATD because supply air momentum, other than buoyancy effects and ambient air flow, is the major driving force in the micro-environment of occupied zone. In dynamic state, the movement of a person near PV ATD causes entrainment or detrainment effect, which can be regarded as another comparable factor influencing ceiling mounted PV performance. A typical office workplace consisting of either ceiling mounted PV ATD or conventional PV ATD and ambient air supply diffuser is simulated. One person is assumed to be seated and another moving person is simulated by dynamic meshes in computational fluid dynamics (CFD). Simulations at moving person velocities of 0.5, 1 and 1,5 m/s and distance between seated person and moving person of 0, 0.2, 0.4m are performed. A new index, computational personal exposure effectiveness, is utilized to assess the performance of the PV ATD in regard to inhaled air quality under the influence of moving person. According to numerical results, the stability of ceiling mounted PV, under dynamic environment with moving person, is better than that of conventional PV although the personal exposure effectiveness (PEE) is lower than that of conventional PV with the same personalized air flow rate in steady state.

  • 45.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Sekhar, Chandra
    National University of Singapore.
    Human perception relation between thermal comfort and air movement for ceiling mounted personalized ventilation system2012In: Proceedings of the 5th Academic Conference for Chinese Environmental Science Association Indoor Environment and Health Branch (IEHB 2012), 2012Conference paper (Refereed)
  • 46.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Sekhar, Chandra
    National University of Singapore.
    Human perception relation between thermal comfort and air movement for ceiling mounted personalized ventilation system2014In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 935, p. 329-332Article in journal (Refereed)
    Abstract [en]

    As one kind of newly developed personalized ventilation (PV) system, the relation was explored between thermal comfort and air movement perception/acceptability/preference with tropical subjects, who had become passively acclimatized to hot conditions in the course of their day-to-day life. The tests were conducted in field environmental chamber (FEC) of National University of Singapore. 32 subjects (16 males and 16 females), performed normal office work, can choose to expose to four different PV airflow rates (4, 8, 12, 16 L/s) so as to simulating individual control. Ambient temperatures of 26°C and 23.5 °C and PV air temperatures of 26 °C, 23.5 °C and 21 °C were utilized to conduct parametric variation studies. Each combination was maintained for 15 minutes during which the subjects responded to computer-administered questionnaires. Under different PV airflow rates and ambient/PV temperature combinations, the relation between thermal comfort and air movement perception/acceptability/preference was analyzed.

  • 47.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Sekhar, Chandra
    National University of Singapore.
    Human perception relations between air movement perception acceptability and preference for ceiling mounted personalized ventilation system2012In: Proceedings of the International Conference on Green Building and Optimization Design (GBOD 2012), 2012Conference paper (Refereed)
  • 48.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Sekhar, Chandra
    National University of Singapore.
    Interaction of dynamic indoor environment with moving person and performance of ceiling mounted personalized ventilation system2012In: Proceedings of the International Conference on Green Building and Optimization Design (GBOD 2012), 2012Conference paper (Refereed)
  • 49.
    Yang, Bin
    et al.
    Department of Building Services, Hebei University of Technology, Tianjin, China.
    Sekhar, Chandra
    National University of Singapore.
    Interaction of dynamic indoor environment with moving person and performance of ceiling mounted personalized ventilation system2013In: Indoor + Built Environment, ISSN 1420-326X, E-ISSN 1423-0070, Vol. 23, no 7, p. 920-932Article in journal (Refereed)
    Abstract [en]

    Ceiling mounted personalized ventilation (PV) aims to provide clean outdoor air into human breathing zone without affecting indoor aesthetics in energy-efficient manner. In steady state, its performance depends much on the ceiling mounted air terminal device (ATD) because supply air momentum, other than human body thermal plume and ambient air flow, is the major driving force in the micro-environment of occupied zone. A typical office workplace consisting of ceiling mounted PV ATD and ambient air supply diffusers was simulated. One person was seated and another moving person was simulated by dynamic meshes in computational fluid dynamics (CFDs). A new index, computational personal exposure effectiveness (PEEc), was utilized to assess the performance of ceiling mounted PV system in regard to inhaled air quality under influence of moving person. Meanwhile, influence of evenly distributed ceiling mounted PV ATDs on inhaled air quality was also studied. According to numerical results, stability of ceiling mounted PV under dynamic environment with moving person was acceptable with minor changes of PEEc and inhaled air quality could be improved over larger occupied area for both seated person and moving person.

  • 50.
    Yang, Bin
    et al.
    Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
    Sekhar, Chandra
    National University of Singapore.
    Numerical algorithm studies of CFD modeling for a compartmented cooling coil under dehumidifying conditions2007In: Numerical Heat Transfer, Part A Applications, ISSN 1040-7782, E-ISSN 1521-0634, Vol. 52, no 8, p. 737-755Article in journal (Refereed)
12 1 - 50 of 75
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