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Simulation method is used to establish energy baseline as the basis for predicting energy saving potential for passive strategies that cannot not be measured through energy audit. Apart from active measures, many more energy saving potentials can still be explored through passive strategies. The actual energy saving of 1,688,347.02 kWh/year (50.08 %) was obtained from the chiller system retrofit and slightly higher than what was predicted with discounted payback period of 6.29 years.
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A chiller retrofit measure was implemented as pilot project and the predicted energy savings were validated by empirical evidence. Energy audit predicts that the chiller system provides the highest energy saving amount of 1,535,175.40 kWh/year (45.54 %) with discounted payback period of 7.15 years. Three methods are applied in this approach which involved energy audit, empirical evidence and simulation works. The overall aim of this article is to evaluate the potential for energy saving in public hospital using a systematic approach. Thus, there is a need to find the most appropriate method to explore energy saving opportunities as much as possible. Energy efficiency is an important component in every green building rating tool because of its high potential on point scoring. At the same time, the Ministry of Health Malaysia has set a policy for all hospitals to achieve green building certification, which in line with its global commitment to conserve the environment. Hospital buildings are the main energy users among government facilities which require substantial energy reduction to save its annual operational costs.