An energy-efficient building is not built in a day. It requires effective processes, approaches, and tools, as well as high commitment from all the involved parties. A similar requirement is needed for effective retrofitting practice. Building Information Modelling (BIM) is one of the sensible processes in ensuring either the new building development or retrofitting initiatives arrive at its ultimate objectives, i.e., reduction in energy consumption, energy cost, and removal of harmful emissions. Many studies had proved that a window is one of the building elements that could contribute to establishing an energy-efficient building. Therefore, a 25-floor Wisma R&D, University of Malaya building was modeled using ArchiCAD to analyse the influences of window glazing, opaque materials, and shading elements on overall building energy performances. The accuracy of the model and simulation outcome was initially compared with the energy audit result conducted from March to May 2017. Consequently, this study revealed that the effective combinations of the window parameters had assisted in improving the infiltration rate and heat transfer coefficient which allowed a lower cooling load within 3% to 6%, respectively. After most, minimum savings of 18,133.9 kWh, RM 6618.88, and 1265.16 kg of carbon dioxide (CO2) were gained through a reduction of cooling load in Wisma R&D based on the window system improvement. This article aims to promote the capability of ArchiCAD as a practical tool for effective retrofitting decision-making. Ultimately, this study revealed the importance of a multivariate framework in building energy conservation and provide an insight into the improvement of the Malaysia Standard MS1525:2019, mainly for high-rise buildings in Malaysia.
Compared to other industries, the construction sector has poor productivity performance. Many megaprojects in this industry incur cost overruns, and this is largely due to inefficiencies. Although there are several reasons for these inefficiencies, the most significant factor is the lack of efficiency. One effective solution to improve productivity in construction projects is to adopt Off-site construction (OSC) methodology, which enhances efficiency. The construction method selection is an important exercise toward the productivity and success of a building project. This exercise is particularly critical during the early stages of a building project, as it is important for decision makers to consider all criteria and make a prompt decision.The use of off-site construction (OSC) is gaining popularity in building projects. Therefore, assessing the most relevant and key success factors in this context is necessary. Multiple Criteria Decision Making (MCDM) techniques have been widely used in the construction management domain. These are being applied as a medium for decision-making purposes in the construction sector. One of the most frequent methods is Fuzzy Logic to select an option among different alternatives based on a ranking system. In this paper, Fuzzy logic was applied to evaluate and rank the performance of two alternatives i.e. conventional method of on-site construction cast in situ works and Off-site construction steel structure fully modular approach. This project forms part of a Ph.D. research program which aims to develop a Two-Stage BIM-Lean Decision Support System (DSS) for the selection of a suitable Industrial Building System (IBS).The proposed DSS development consists of two main steps: 1) Identification and evaluation of Key Decision Support Factors (KDSF) for the selection of the OSC approach and 2) Choosing an appropriate IBS for a building project. This paper focuses on the second step where fuzzy logic is applied to rank and select the appropriate alternative. A decision maker was provided with a list of Key Decision Support Factors (KDSF), which had been validated by industry experts, to input data and measure the importance and performance of each alternative. Crisp scores calculated using a fuzzy model indicated the rank of each alternative. The highest score of alternatives indicates the best approach. The result shows that alternative B -Off-site construction Steel Structure Modular approach, is the better option.
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