Sep 9, 2012 Energy Talks
6.5 Already Scheduled Maintenance and Refurbishment Works
When determining EMO, it is necessary to take into account the already scheduled major maintenance and refurbishment works. Therefore, when planning EMO implementation programme, the already scheduled major maintenance and refurbishment works may consider including some of the EMOs.
6.6 Annual Monthly Energy Consumption Profile
Based on the energy consumption bills over past years (preferably 3 or more), the auditor should estimate the annual energy use of the building. Graphs of energy consumption against different months of the year can be plotted, from which a pattern or general trend over a number of years can be seen. These graphs can show normal seasonal fluctuations in energy consumption. More importantly, any deviations from the trend are indication that some equipment/systems had not been operating efficiently as usual, which warrant more detailed studies to identify if further EMO has existed.
6.7 Energy Utilisation Index/Building Energy Performance
The Energy Utilisation Index (EUI), obtained by dividing the annual energy consumption by the Gross Floor Area (GFA), takes into account the difference in energy consumption due to difference in building floor areas and is used for comparison of energy consumption among buildings of similar nature. An ordinary office building usually has an annual EUI of 700 to 1, 100 MJ/m2 (200 to 300kWh/m2). The EUI should be also regarded as the Building Energy Performance (BEP).
As the key form of energy used in commercial buildings is the electricity and other forms of energy such as town gas, LPG, diesel, etc. are relatively minor in quantity, some BEP computed for buildings have not included these forms of energy. Usually, EUI or BEP, if not identified as an index for a particular month, refers to the index for an entire year.