Raidah Md Sudi is a PhD student of Process Systems Engineering Centre (PROSPECT) in Universiti Teknologi Malaysia. Previously, she obtained a Bachelor Degree from UTM in Chemical Engineering. She then continues her study at the same university and obtained her Master Degree in Safety, Health and Environment. Raidah’s current research is on heat integration where she focuses on heat exchanger network retrofit for energy saving. Her main objective of the research is to develop a new numerical method to improve energy efficiency of existing HEN. Her research also concerned on the controllability of the retrofitted network which may constrain the energy efficiency of a network.