The purpose of this study was to create a building-envelope structural modification system (BESMS) and an accompanying algorithm that could be used to improve a building's energy efficiency. The proposed system is capable of deciding the optimal structure of a building-envelope. Methods adopted in the study include a review of previous studies and reference literature and, interviews with relevant industry experts. As part of creating the BESMS and algorithm, a five-stage building-envelope design process (BEDP) offering a basis for the BESMS was established. A model using BIM-based design software programs as platforms was proposed as well. The decision-making system for designing the proposed model was developed by combining the FLSs (AI technique) and AHP (decision-making method). Based on these outcomes, components of the BESMS were defined, an inference-deciding structure was determined for each decisionmaking item as required by the BESMS, related design factors were identified, and the degree of importance was calculated. Lastly, using these results, the model for the BESMS was created.Keywords: building envelope; energy efficiency; schematic design; algorithm; fuzzy logic Introduction 1.1 Purpose of StudyGiven the demand for eco-friendly architecture in this environmentally-conscious age, there has been a drive in the architecture and the construction industries to improve the energy efficiency of buildings (Peter, 2006). Improvement in efficiency is determined by optimal, efficiency-related values of design factors that are adopted during the design process. Designing an optimal building envelope is of particular importance since the design affects the building's energy consumption and has close relationships with the indoor environment created. Implemented at the schematic stage where design factors are decided, optimal envelope design affects both energy performance and maintenance of the building (the result). As such, it is vital that the building's architect or designer decide the structure of the envelope during the schematic design stage based on energy performance levels of the building and directly incorporate this structure into the design.
Since the importance of eco-friendly architecture is rapidly increasing, BIM receives significant attention as an alternative that would derive the practical results and apply the design values of eco-friendly design elements to the architectural design process. Therefore, this study establishes an Integrated Design System based on Green BIM by applying the eco-friendly design values logically and systemically. The study also proposes practical case studies to examine the possibility of application. As a result, the framework of Green based Integrated Design System(gbIDS) and a prototype of Web-based gbIDS were developed to improve the working environment of small architectural firms.
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