Mohd Zin Kandar

Investigating Daylight Quality Using Self Shading Strategy in Energy Commission Building in Malaysia

There are a lot of office buildings without strategies for daylight utilization. Different strategies are suggested for better use of daylight. Self-shading strategy has been suggested to eliminate direct solar radiation to minimise energy use for cooling in offices but, the amount of daylight penetrating into the building can be reduced. In this research, the effectiveness of self-shading strategy on daylight is investigated through experimental method. Daylight parameters are measured in two individual office rooms in Energy Commission Building as a model of self-shading buildings. The objective is to investigate daylight quality in individual office room based on different criteria such as work plane illuminance, relative daylight ratio, surface luminance have been compared with recommended values. Finding of this research demonstrates that by employing self-shading strategy, the amount of daylight that enters the space could reduce but by applying other strategies like light shelves and venetian blinds, with self-shading strategy, acceptable performance in terms of daylight quality can be achieved. These strategies can be employed for future design of office buildings to reduce energy consumption for lighting as well as to comply with the goal of sustainable architecture.

Investigating the effect of well geometry on the daylight performance in the adjoining spaces of vertical top-lit atrium buildings

This study investigated the impact of well geometry on the amount of daylight availability in the adjoining spaces around atria with vertical top-lit forms under overcast sky condition in Malaysia. The daylight levels in the central south office rooms were derived from scale model measurements, and predictions from the lighting simulation program Radiance in Integrated Environmental Solution . A comparison of measured data and simulations has validated Radiance simulations of atrium daylighting. The simulations show generally good agreement with physical model measurements. More simulated data of average daylight factor for a very wide range of atrium geometries are given. Findings of this research develop an atrium with optimum geometric proportions to create office spaces with enough potential for daylight utilisation. It demonstrates that a model of atrium with atriums plan aspect ratio 1/3, atriums section aspect ratio 1, and 3/8 atrium clerestory to atrium height is the most proper model of atrium for providing the sufficient daylight in the adjacent spaces of vertical top-lit atrium. This research will present a demonstration and general guide for the designers to predict daylighting performance of an atrium building in the tropical climate regions.

Importance of a View Window in Rating Green Office Buildings

The essence of a view window (VW) in an office building is not only to bring an optimal balance between daylight and electric light, but also for psychological and health purpose. VW does not only allow the admittance of light and views, but indirectly affects the productivity and psychological wellbeing of office occupants; it has a link to the sustainability in both conventional and green buildings. This paper defines the function of a view window as it relates to green office building. Through literature review and an experiment conducted in room 432-01 located at B11 Faculty of Built Environment, Universiti Teknologi Malaysia. The function of VW in a green office building is highlighted; and the findings show that a VW would enhance sustainability in an office setting and has a dimension greater than 750mm above a finish floor level and less or equal to 2300mm above a finish floor level and with a wall to window ratio (WWR) of 25% to 40%.

Exploratory survey of recessed window façade shading in Johor Bahru Malaysia

The built environment is a major source of global energy consumption and greenhouse gas (GHG) emissions potentially exacerbating the threats of climate change. With global rising temperatures, the energy requirements for cooling and ventilating buildings in tropical nations like Malaysia will soar geometrically. Scientists around the globe are exploring several technologies to address the challenges posed by building emissions and energy consumption. One of the main methods is the application of passive design strategies such as external façade shading or self-shading. Studies indicate one of the most practical self-shading technique is recessed window facades (RWF) which can easily integrate without reducing natural light and obscuring views. However, studies on the RWF are limited in literature particularly in Malaysia. This research aimed at carrying out an exploratory survey of recessed window façade (RWF) shading in selected buildings in Johor Bahru Malaysia. The RWF buildings characteristics namely; Window-Wall Ratio (WWR), Recessed Depth (RCD), Shading Ability (SHA), Solar Heat Gain Coefficient (SHGC) and Shading Coefficient (SC) will be examined. The results indicated that the values for solar heat gain and shading coefficient are within acceptable limits. Furthermore, the high shading ability of the buildings indicated that RWF might be responsible. Further studies are required to ascertain empirical correlations between the examined characteristics. This further study will potentially improve the design of more energy efficient, low emission and thermally comfortable buildings for the future.

Low Carbon Emissions Through the Use of Bipv Windows in Algerian Mid-rise Buildings

Sustainable developments in the field of architecture are turning out to be increasingly vital which requires the utilization of renewable energy and the reduction of energy consumption in Algerian mid-rise buildings. However, Algeria energy utilization which is not sustainable has contributed to excess amount of CO2 emission. This study investigated the potential of using PV system in vertical facade (azimuth 90 °) and identifies the yield of photovoltaic in each orientation and tilt angle (horizontal, 30 °, 90 °). Through a series of simulations were perform in eight azimuth (and tilt angle from 0 ° to 90 °) throughout four season by using Polysun software in order to evaluate the optimum power output of 1.54 m2 of Mono-crystalline windows. This was carried out on a 7th floor office building of Tebessa University which contain, the area of the roof 242 m2, the area of whole facades 1,904 m2, whereas the surface of the opening (windows) 580 m2. The difference of energy output in mid-rise building (7 levels) between the Roof area and whole facade area was up to 3.6 times. Consequently, after calculation the total amount of energy output. It revealed that the energy output of BIPV windows is higher than BIPV on the roof; however the performance of the BIPV in the roof is much better than facade. In overall, the application the BIPV windows in mid-rise buildings under semi-Arid climate is favorable and convenient, increased the CO2 saving to 173.4 kWh/y, and reduce more than 200 kWh/y energy to supply the energy of buildings.