**5. Conclusions**

Currently, the two regasification terminals operated by PETRONAS Gas Sdn Bhd do not capture waste cold energy during the regasification process. This study noted that substantial waste cold energy is available during regasification at both RGTPJ and RGTSU. The estimated annual amount of cold energy that could be captured daily during regasification at RGTPJ and RGTSU is 47,214 and 88,383 kWh, respectively. The study evaluated the commercial potential of using the available cold energy for chilled water generation. The chilled water is to be used for space cooling. Assuming 70% thermal e fficiency conversion of waste cold energy to chilled water, it was estimated that daily, the amount of cold energy available hourly during regasification at RGTPJ and RGTSU is equivalent to 9398 and 17,592 RTh amount of chilled water, respectively. From the economic feasibility study, commercially, the revenue from the chilled water could give IRR greater than 20% for RGTPJ for a project life of 5 to 20 years. For RGTSU, the IRR values are 12% to 17% for a project life of 10 to 20 years. Hence, if the waste cold energy during regasification at RGTPJ and RGTSU is exploited, it would give a profitable venture. In addition, the venture would also increase the e fficiency of LNG regasification at both terminals and the economic benefit of the LNG supply chain. Besides using the cold energy for generating CW, the waste cold energy could also be used to cool intake air for the gas turbines. Since RGTPJ is located near the vicinity of a cogeneration plant, the cold energy from regasification should also be considered for use for cooling intake air for the gas turbines at the cogeneration plant. It is therefore recommended that the owners of RGTPJ and RGTSU should consider installing systems able to capture the waste cold energy during regasification of LNG at both terminals.

**Author Contributions:** Conceptualization, M.A.A.M. and H.H.Y.; Methodology, M.A.A.M. and H.H.Y.; Software, O.M.; Validation, S.M.; Formal Analysis, M.A.A.M. and H.H.Y.; Investigation, O.M.; Resources, O.M.; Data Curation, S.M.; Writing-Original Draft Preparation, M.A.A.M. and H.H.Y.; Writing-Review & Editing, M.A.A.M. and H.H.Y.; Visualization, O.M.; Supervision, M.A.A.M.; Project Administration, M.A.A.M.; Funding Acquisition, M.A.A.M. and O.M.

**Acknowledgments:** This work represents collaborative research among Universiti Teknologi PETRONAS, Malaysia, and Heriot-Watt University, U.K., and was funded by the British Council's Newton Institutional Links entitled "Building institutional links to deliver sustainable cooling energy demand." The authors would like to acknowledge the support of RGTPJ and RGTSU for this research.

**Conflicts of Interest:** The authors declare no conflict of interest.
