In-Han Kim

Analysis on Green BIM based Atrium Sizes in the Early Design Stage

This study for establishing specific standards of atrium design aims to discuss design of atrium to consider energy performance atrium in office buildings. In order to evaluate a type and a scale of atrium at the early design stage, modeling details of mass design were set as standards of conceptual design. In the experiment, Project Vasari was used to analyze modeling and energy consumption, based on the LOD 100-step suggested by AIA, because there is no guideline to specify a level of modeling details at each design process. From this analysis, the correlation among a simple-typed atrium and scale and energy load was considered. The result of this research is as follows: First, the single-sided atrium reduced energy the most, and it was followed by three-sided, two-sided, four-sided and continuous-typed ones. On the whole, they could decrease energy by up to about 15%. Also, the atrium with a wide facade facing in the south was more favorable to reduce energy. Second, planning the atrium within 10~30% of the whole building area was more energy efficient. Third, rather than the depth, adjusting the length in designing an atrium could reduce cooling and heating loads by 1.5% per 1m. As explained above, energy performance evaluation considering types and planning elements of atrium helps to assess alternatives in a reasonable way. In particular, considering the use of building needs to be preceded to select a type of atrium, although it is also important to consider its planning elements.

A Study on Domestic Standard Parameter Setting for BIM-based Energy Performance Evaluation Focused on Possession Area per Person of Occupants in Government Offices

Currently, the United States, the United Kingdom, Australia etc. are actively utilizing energy simulation for efficiency evaluation of building energy. However, domestic energy efficiency assessment system doesn’t use energy simulation system properly at present: parameters based architecture plans and Ashrae Standard are inputted for the evaluation, because the input parameters for the simulation haven’t been established yet. This fact causes poor reliability during energy simulation, as the values of the two standards are different from each other. Therefore, the aim of the study is to set domestic standard parameter for BIM-based energy performance evaluation, focusing on possession area per person of occupants at government office in Korea. We found that the difference among the result values occurred approximately 3% in the energy simulation. As a result of the analysis, possession area per person of occupants in Government office is 31.87 m . Other input parameters may be set based on this. This will increase the reliability of energy simulation through a domestic standard parameter.

A Causality Analysis among Architectural Design Decision Factors in the Early Design Stage - focused on Reduction of Cooling and Heating Loads in Energy BIM Simulation -

BIM records all the data of buildings from the early design stage and, therefore, has the advantage that it can actively cope with energy simulation feedback and design change with development of design stages. However, preparation of simulation based energy performance assessment system and development of BIM based low carbon design technique are still unsatisfactory. For greenhouse gas mitigation and energy saving in the architectural sector, applying of BIM based_low carbon design technique is required from the early design stage. However, as the research areas are limited to sub-segmented topics, it is difficult for designers to establish grade of rank of low carbon design technique required for application in design planning. This study attempts to analyze grade of rank and correlation among design techniques affecting building energy performance. As targets of experiments, the study selected tower buildings, which are favored recently as business facilities with huge scale, massive energy consumption and big impact on the surrounding environment. The study analyzed result values yielded from different shape, scale, slenderness ratio, window-to-wall ratio, and solar orientation of the tower buildings. Through the experiments, the study found that the component having the biggest impact on building energy performance is window-to-wall ratio(WWR) followed by slenderness ratio, envelope area and solar orientation. The influence of WWR is the biggest with 81.2% among the design components. Smaller WWR makes bigger change range of heating and cooling loads. Therefore even small change can have significant effect on energy performance. Also, In the same total floor area, slenderness ratio closer to 1:1 is more advantageous for HCL. Besides, even with the same ratio of lateral to longitudinal length, relatively long mass in the direction of East and West can increase energy performance up to 6.4%. Then, the study drew out correlation and grade of rank among different design techniques. Based on the data, energy saving can be achieved from the early stage of architectural planning. The architects also can maximize energy performance efficiency by considering and applying grade of rank of low carbon design technique in design planning. Besides, development of guidelines on Energy BIM would reduce confusion in the decision making process and design modification in development stages of design.