3. Methodology
3.1 Benchmarking Systems The energy benchmark system in the world has two major categories. The first is ‘real world’
3.2 Definition and Criteria According to the concept of the benchmark, only similar kind of buildings can be compared. Therefore, a group of large office buildings that is located in central area of Bangkok, at least 1MW of peak demand, centrally air-conditioned and air-conditioned area more than 1,000 m2 are considered.
3.3 Data Collections It is compulsory for buildings in Bangkok that their peak demands exceeding 1MW to comply with the Energy Conservation Act, 1992 (ECP Act), and biannually submit an energy performance report to the Department of Alternative Energy Development and Efficiency (DEDE). In this case, forty-one designated office buildings are selected, and a data set of an individual sample is derived including monthly as well as annual energy consumption data, operating hours per annum, and air-conditioned area. To be noted that, energy consumption data that takes account for all types of energy used in buildings are recorded for year 2004, and different units of energy used such as liter for diesel and liter or kilogram for Liquefied Petroleum Gas (LPG) are changed to kWh according to a conversion table and submission blank form available at http://www.dede.go.th/dede/file admin/usr/berc/energy save/build. The summary of data is shown in Figure 1-Figure 4.