Abstract. Nowadays, increasing of energy consumption due to global warming issues such as heat island effects has attracted the awareness of researchers, architects, engineers, property developers, and authorities to the crucial of green construction or sustainable development concept. Energy efficiency has been identified as a key consideration in discussions of this concept. In term of energy, Malaysia ranked 33 rd in the list of global electricity consumption and 25 th in the list of man-made carbon dioxide emissions. If energy consumption continues to increase at its current rate, domestic petroleum reserve in Peninsular Malaysia is predicted to be depleted by 2014 and Sarawak by 2020 [1]. As responding to the increasing of energy consumption, the demand of green roof technology as passive cooling technique has been recognized worldwide. Generally, by greening the rooftops in urban area, the impact on the urban climate and microclimate as well as on the indoor climate of buildings beneath them will be reduced. Therefore, this paper systematically review the concepts of green roof to give a basic understanding as global. Discussion on the benefits of this concept and its components among topic will be discussed.
Abstract. It is a well-documented that the urban air temperature is gradually growing in all cities due to the rapid development of buildings, roads and other infrastructure, human activities and also decreasing in vegetated areas. In a tropical climate, outdoor environment is clearly warmer than indoor environment due to higher air temperatures, particularly in dry seasons. Since the indoor environment is influenced by its surroundings, this situation indirectly contributes to the discomfort indoor environment in the building. Thus, it generates to the dependence on mechanical ventilation and increase the energy consumption in buildings. Many research studies have proof that plants not only beauty a city, but also improve the urban environmental condition by reducing the transferring of heat flux on buildings and increasing the reflection of radiation and shading. Therefore strategically placed vegetation around a building could decrease the energy consumption in buildings by reducing the adverse impact of some climate elements. Overall, this paper focuses on the results of a preliminary pilot study of two Semi-Detached houses with different landscape density in Seri Iskandar, Perak. Three climatic parameters, building configuration, and landscape design measured and analyze in this paper.
Vegetation plays a crucial role in establishing a comfortable thermal environment by regulating temperature, humidity, and wind velocity. It is a well-documented that the Vegetation Structure (VS) variables, including height, density, leaf colour and size, canopy, density can have a significant impact on the microclimate inside and around the plants. However, the correlation between the different vegetation structures around residential buildings and the meteorological conditions inside and outside remains unclear. In this paper, an experimental investigation was carried out to determine the effect of VS on residential buildings’ microclimate. Parameters of meteorological were measured in and around two Case Study (CS1 & CS2) which are single story buildings located in Perak, Malaysia. Five days of meteorological data were collected using a Thermal Microclimate Datalogger (HD32.1 Delta Ohm) and an Indoor Air Quality Datalogger (HD37AB1347 Delta Ohm) to measure temperature (oC), relative humidity (%), and air velocity (m/s). Both case study's VS variables were measured and then thoroughly examined to determine the potential of VS in generating a pleasant thermal environment. This research compares and discusses VS and meteorological parameters measured within and outside of the case study buildings. The results were analyzed in three Quartile: Q1 from 7:30 a.m. to 11:00 a.m., Q2 from 11.15 a.m. to 2:30 p.m., and Q3 from 2:45 p.m. to 6:00 p.m. In Q1, CS1 shows the highest outdoor-indoor temperature difference of 2.31℃ compared to 2.02oC for CS2. In contrast, CS2 recorded the highest ambient temperature differences of 1.35℃ and 2.73oC in Q2 and Q3, respectively compared to CS1; 1.27oC and 1.19℃. Overall, vegetation structure can have a significant impact on meteorological parameters, which can in turn influence indoor and outdoor thermal performance.
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