Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 100, Issue 2 (2022) 15-22 15 Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Journal homepage: https://semarakilmu.com.my/journals/index.php/fluid_mechanics_thermal_sciences/index ISSN: 2289-7879 A Case Study on Potential Saving of Energy Consumption at Hospital Putrajaya Zamri Noranai 1,* , Nurul Farahin Mohd Joharudin 2 , Noradila Abdul Latif 2 , Nur Liyana’ Amirah Mohd Kamil 2 , Mohd Azahari Razali 1 1 Centre for Energy and Industrial Environment Studies (CEIES), Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia 2 Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia ARTICLE INFO ABSTRACT Article history: Received 23 March 2022 Received in revised form 15 September 2022 Accepted 23 September 2022 Available online 15 October 2022 Efficient electrical energy usage has been recognised as one of the significant factors to reduce the cost of electrical energy consumption. In this world, hospitals are public buildings that use the enormous energy of other buildings. Due to its 24 hours service, the use of hospital building energy is estimated to be among the highest compared to commercial and residential buildings. In this research, the main building of Putrajaya Hospital has been selected. The main building covered by the first floor until the fifth floor will be focused to conduct this research. This research aims to identify energy consumption, cost savings and the provision of solutions to achieve the cost savings target of Putrajaya Hospital. The characteristics and location of the building were recognised at the beginning of the research. Besides, this study was continued by identifying the lighting system presented at Putrajaya Hospital and the electricity tariff published by Tenaga Nasional Bhd. The calculation of energy consumption and cost for each floor of the main building, starting from the first floor to the fifth floor proposed the energy saving method. Four potential savings methods are proposed later in this research which include the switch to LED lighting saving potential, occupancy sensor, regular maintenance, and reduce light operation hour by using the alternate system. The result was found that energy consumption can be reduced up to 73.38% by switching the current lamp to LED lamp. Keywords: Hospital building; energy consumption; lighting system 1. Introduction Energy is a significant source of power for human in daily activity. Energy can be neither created nor destroyed but only changed from one form to another [1, 2]. Today’s trend, electrical energy devices are considered as important as water and air for human being [3]. According to Britannica Encyclopedia, energy can be defined as the capacity for doing work, which may exist in potential, thermal, kinetic, electrical, nuclear, chemical, or other several forms [4]. The increasing energy demand, especially in cities, offers many chances to improve energy efficiency. Management of * Corresponding author. E-mail address: zamrin@uthm.edu.my https://doi.org/10.37934/arfmts.100.2.1522