Hayati Abdullah

Identification building energy saving using Energy Efficiency Index approach

Energy can be reused or saved instead of simply wasted by implementing strategic planning. In commercial building, energy consumption varies due to various factors such as building design, climate, load usage, type of electrical appliances, and management. Since each room in a building is designed to accommodate certain number of occupant, the room capacity is also considered as one of the factors that affect energy consumption. However, by placing inappropriate number of occupants in a room, the optimum use of energy cannot be achieved. For an example, energy may be wasted if the room that is designed for 200 occupants is only occupied by 98 people. In response to this concern, energy saving can be made by shifting or reconfiguring the number of occupant to make more suitable room. This strategy is called as a class shifting method. It can minimize electricity usage by simply shifting occupants into an appropriate room which is design nearly for that amount of capacity. This paper presents evaluation on class shifting strategy in term of its ability in reducing energy consumption. The study was conducted on selected building in Faculty of Electrical Engineering, Universiti Teknologi Malaysia (UTM) by using Energy Efficiency Index (EEI) reading as a baseline in determining how much energy is being wasted as well as being saved. The result from the application of shifting method showed a significant number of energy saving that can be made.

A method for evaluating energy saving potential in lighting from daylight utilization

Daylight-linked lighting control systems can provide substantial savings in rooms with daylight availability. Energy saving potential from daylight utilization depends on several parameters of the room. Different methods to predict energy savings from daylighting exist. This paper aims to develop a new method that is easy to apply yet comprehensive, and gives a good indication as to the potential of energy saving from daylight utilization. The process is described step by step along with results from applying the method in a simulated test project as an example.

Performance evaluation of an actual building air-conditioning system

Air-conditioning contributes significantly to high energy consumption in commercial buildings. It is essential to monitor and evaluate the performance of air-conditioning systems to avoid unnecessary energy wastage. This paper presents the results of a study carried out to evaluate the performance of an actual building air-conditioning system with reference to the Malaysian Standard MS1525. The results of the air-conditioning systems performance and thermal comfort analysis are presented and a comparison is made to the results of a survey conducted among the occupants of the building. Although the results indicate a satisfactory coefficient of performance for the building despite the age of the system, recommendations on system improvements are proposed to further save energy.