This paper described the simulation tool to evaluate energy management level of buildings for business use. The annual energy consumption can be easily estimated for various types of office buildings by this tool, of which input parameters are related with the building services and end-use conditions. This tool is user-friendly because the Input & Output Unit is developed in order to simplify the operations. Although this simulation program simplified on the basis of HASP/ACLD and BECS/CEC/AC does not need the numerous and the detail input parameters, the annual thermal loads and the annual energy consumption of air-conditioning systems for each simulated building can be calculated with the same accuracy as those by HASP/ACLD and BECS/CEC/AC. Any other energy consumption for each building service can estimated by using prediction formulas derived by the multiple regression analysis through the research conducted in order to keep track of actual conditions. Furthermore, the tool has extensive characteristics to be versatile in order to accommodate any future changes required for systems.
