Analysis of energy performance improvements and economic impacts for discovery learning libraries of Bangkok metropolitan administration

The Discovery Learning Libraries of Bangkok Metropolitan Administration have been examined in terms of energy performance. There are eight libraries with the same shape but located in different districts. The average energy intensity of the building is 183.03 kWh/m
²
. EnergyPlus was used to simulate the energy performance of the buildings, to examine the energy saving measures and to assess the energy savings. This study found that the air-conditioning system utilizes the highest amount of energy (52.44%), and followed by lighting (32.10%) and others (15.46%). The 16 energy saving measures were proposed and examined based on building energy simulation model. The results show that the 16 measures are significantly reduced the energy intensity as well as CO
₂
emissions. The results of the economic assessment showed that five measures are attractive options in terms of NVP, IRR and DPP. The sixth measure (3+1) is the most appropriate manner, whether NPV, IRR and payback period. However, the measures 1, 10, 11 and 13 are attractive options in action.