Spending a few weeks sailing the seas on a luxury liner is an idea that appeals to a growing number of people, particularly in Asian countries. But cruise ships do not just sail from port to port: as veritable floating hotels accommodating several hundred passengers, they use a great deal of energy for heating, electricity, air conditioning and various other aspects of life on board. To make them more environmentally friendly, Francesco Baldi, a researcher in EPFL’s Industrial Process and Energy Systems Engineering Group (IPESE), has come up with a novel solution.

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