The Study of Building Development of Building Energy Code: A Case Study Chaloem Phrakiat 56th Phansa Building at Rajamangala University of Technology Lanna

Abstract

This research studied the net energy use of a building: Chaloem Phrakiat 56th Anniversary Building. The building was utilized for 8 hours and has been in operation for over 10 - 15 years, necessitating improvements for energy conservation according to ministerial regulations. Architectural studies and building surveys were conducted to assess energy usage in the building, including the building materials and building systems, and to simulate the building using the online Building Energy Code (BEC) Web-based program. The results were compared with the Ministerial Regulation Prescribing Type or Size of Building and Standard, Criteria and Procedure in Designing Building for Energy Conservation B.E. 2563 (2020) to propose improvement measures. The study results found that the total heat transfer value of the walls was 53.251 W/m², and the roof was 37.305 W/m², which exceeded the ministerial regulation criteria of 50 W/m² and 10 W/m². The building systems met the ministerial criteria. The proposed improvements included adding heat-insulating film coated with heat-reducing substances and increasing roof insulation with low thermal conductivity and high thermal resistance properties. As a result, the OTTV and RTTV values decreased by 38.74 W/m² and 9.50 W/m². The overall energy consumption of the building, which was initially less than the reference building at 303,831.88 kWh/year, was reduced to 261,010.92 kWh/year after the improvements. In terms of the budget, the investment feasibility was approximately 1,761,351.93 Baht, with a payback period of 9.72 years. This leads to potential cost saving for the university by reducing electricity expenses by 53.96 % after the building improvement.