Development of Building Information Modeling to Calculate the Overall Thermal Transfer Value at Schematic Design Stage

Abstract

According to the Energy Conservation Promotion Act II B.E. 2007, Overall Thermal Transfer Value (OTTV) could be calculated in various ways such as manual calculation or using BEC V.1.0.6. program. However, it was found that the current program would input a lot of data from the designers and can be changed all the time. This can increase to errors in the input data. To protect this problem, the algorithm in Autodesk Revit program coupled with the Dynamo add-ins with the goal to generate commands capable of controlling and retrieving data, and mathematical calculations, which can generate the result of the OTTV equation in accordance with The Ministerial Regulation of Energy B.E. 2009 has been developed, by the steps in studying from relevant literatures and survey questionnaires to seek the current problems then the data were developed program and compared the calculation results. Moreover, the result of this development is the add-ins in Autodesk Revit program for estimating OTTV in the schematic design stages in which users can adjust the design and the value would then be changed automatically, thus reducing the overlapping processes. Compared to the BEC V.1.0.6 program, it was found that the estimated OTTV value generated by the Dynamo add-ins has an approximate deviation of ±1.0 % due to the different linear interpolations which cause the difference in the results.