• General Article

    Evaluating the effects of light-shelves to daylight distribution at south facing window using physical scaled-model method
    Ali A. S. Bahdad, S. F. Syed Fadzil and N. Taib
    The aim of this study is to present a critical examination under actual sky whether light shelves could change the daylight performance ... + READ MORE
    The aim of this study is to present a critical examination under actual sky whether light shelves could change the daylight performance at back areas of space. Two parameters of light shelf design have been examined - location (L) and Position (P) which have been placed on the south facing window. A scaled-model experiment has been applied through a typical room model to deter-mine the illumination distribution levels achieved by light shelves under real sky conditions. Scaled model results were validated against computer simulation using radiance calculation, it found to be in good agreement, and the results indicated significant Pearson correlations at the 0.01 to 0.04 level. The maximum percentage of Daylight Ratio (DR) differences was 1.8% (≤10%). The results indicated that, there is no common Light Shelves (LSs) solution under tropics sky, due to the dynamic tropical sky. The optimal cases were found in different times at location L1 and L2 at P1 give the best illuminance levels. The best improvement in daylighting at deep office area (SP3) were 4.2% and 15.5% at 9:00 h on Jan and Feb, 4.7%, 0.6% and 3.6% at 12:00 h, and by 27.2%, 6.8 and 20.3% at 15:00 h on Jan, Feb and March respectively. - COLLAPSE
    March 2020
  • General Article

    Durability assessment for PSC girder member usedfor 46 years in urban area - Resistance to chloride ingress
    Seungjun Kwon and Seunghee Kwon
    Bridge structures exposed to metropolitan cities are composed of several piers of mass concrete, girders and slabs that resist bending and shearing ... + READ MORE
    Bridge structures exposed to metropolitan cities are composed of several piers of mass concrete, girders and slabs that resist bending and shearing forces. Particularly in the case of the superstructure, the deterioration degree is evaluated differently since the design strength grade of the slabs and PSC (Pre-Stressed Concrete) girder differs, and the conditions of resisting the loads as well as localized environmental conditions differ. In this study, 60 core specimens were obtained from the PSC girder bridge used for 46 year in urban area in order to assess the compressive strength characteristics and resistance to chloride ingress (total passed charge and chloride diffusion coefficient). Engineering and durability characteristics are investigated for each location of the core specimens. In the lateral side of the slab, the average passed charge was 4164 C and the core strength was 19.1 MPa, which were 115 % of [HIGH: 4000 C] rating for steel corrosion risk and 80.0% level of the design strength. In the bottom surface of slab, the results were 5251.6 C and the 19.2 MPa, while central portion of the slab has the most satisfactory condition with 4403.3 C and 20.6 MPa. The top flange of girder has relatively sound conditions both for strength and durability with 4993.6 C and 27.2 MPa. In the web of girder, the results were the most satisfactory with 4190.1C and 23.6 MPa. The maintenance plan and assessment for bearing capacity should consider the local member properties since local environmental conditions and strength grade differ. - COLLAPSE
    March 2020
  • General Article

    Implications of political participation for citizens’ willingness to pay taxes for environmental protection: evidence from Korea
    Jaeyoung Lim
    Environmental hazards precipitated by the likes of climate change and pollution have been increasingly posing threats to sustainable human life. To reverse ... + READ MORE
    Environmental hazards precipitated by the likes of climate change and pollution have been increasingly posing threats to sustainable human life. To reverse the trend and protect the environment, governmental efforts and financial support for environmental causes are more urgent than ever before. In these circumstances, this study examines what factors predict citizens’ support for environmental taxation and focuses on whether perceived environmental threats are positively associated with individuals’ support for environmental taxation and whether such relationship is moderated by citizens’ political participation. Using the 2014 Korean General Social Survey and ordered probit, the study finds that an increase in the level of perceivetd environmental threats leads to stronger support for environmental taxation and this linkage is further amplified as the level of political participation increases. The results raise a need for strengthening citizens’ sensitivity to environmental threats as well as improving citizens’ opportunities to participate in political life, in order for the government to meet the challenges of environmental protection. - COLLAPSE
    March 2020
  • General Article

    Analysis of strategies to reduce thermal discomfort and natural gas consumption during heating season in Algerian residential dwellings
    Ilyas Khelifa Kerfah, Sidi Mohamed Karim El Hassar, Jean Rouleau, Louis Gosselin and Abdelkader Larabi
    In Algeria, the more common heating system in multifamily buildings is a gas heater in the central corridor. This system can cause ... + READ MORE
    In Algeria, the more common heating system in multifamily buildings is a gas heater in the central corridor. This system can cause important overheating in the corridor and significant gas consumption. Experimental measurements were performed in a typical dwelling using this heating system and were used to calibrate numerical models built with TRNSYS software. Using these numerical models, the present study calculates the energy savings and thermal comfort improvement for the typical dwelling. Heating system based on hot water radiators was evaluated in this work. A parametric analysis was performed by varying location, thickness of thermal insulation, windows and heating system. Changing the heating system in the studied dwellings, from the central gas heater to the hot water radiators, leads to a reduction of approximately 5% of gas consumption whatever the envelope performance and decreases the number of discomfort hours more significantly. It was also observed that among the scenarios tested, changing the thermal envelope, reduces the heating needs by more than 84% compared to the reference dwelling and then the number of thermal discomfort could be virtually eliminated. - COLLAPSE
    March 2020
Journal Informaiton International Journal of Sustainable Building Technology and Urban Development International Journal of Sustainable Building Technology and Urban Development
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