The company has developed a marine Organic Rankine Cycle (ORC) system for waste heat recovery and power generation that could reduce fuel consumption by up to 10%.
“> […] Enertime’s ORC system produces between 500kW and 1MW of electrical power depending on the available amount of heat. The unit is based on a tailor-made axial turbine and is specifically designed to work in the marine environment. The development work has involved shipyards, shipowners and a classification society, says Mr David.
“Compared to a steam power cycle, ORC systems need very low maintenance, display good part-load efficiency, high availability and can be operated without permanent monitoring,” he said. “Daily operation and maintenance can be carried out without specific qualification.”
The ORC system can work with any kind of heat source. The unit can recover heat from a number of different sources singly or in combination including low-temperature jacket cooling from engines, steam or thermal oil systems and pressurised hot water. Exhaust gas from engines or auxiliaries is the main available heat on board ships, and it can be collected through an exhaust gas heat exchanger and brought to the ORC unit using steam, pressurised water or thermal oil. […]
The ORC layout is flexible and the unit can also be installed as a retrofit where it is possible to adapt the layout of the machinery to specific constraints by splitting it on different levels, for example.
“This kind of system would be very interesting for bulk carriers, small to medium size oil tankers, ferry boats, small container ships… with payback time between two to five years,” […]”<