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HANSA 01-2021

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SCHiFFStECHNiK | SHiP tECHNoloGY Full-scale CFD analysis for energy saving device another issue is bad experience. Many shipping companies have come disillusioned with promised energy savings. »Promised savings are generally too high«, says Volker Bertram (dNV Gl). and then many tramp owners simply do not see the payoff. despite talks about zero emissions, at charter processes the charter rate is still the driving factor. The market itself is in general not yet willing to give a premium for energy effcient vessels. for fuel consumption. Sounds complicated? is complicated. But feasible and the results are promising. »When i analyzed the capabilities of fuel flow modelling approaches after changing company, i got a paradigm-shift«, said daniel Schmode (Wärtsilä). and it comes with the blessing of the HullPiC organizer Volker Bertram (dNV Gl): »This might be the road towards Hull Performance analysis 2.0.« at HullPiC, not only people come together, but also technologies and paradigms. »We are flooded with data. But data by itself is of not much use: it needs to be converted in useful information!«, challenged Giampiero Soncini (iB Marine). He has a point, even though without reliable data, there will be no information or insight at all. Which brings us to the second thing one needs: data processing and analysis models. The most important model for propulsion performance is a model connecting speed and power at different draft and trims, the so-called »baselines«. The most reliable part of the baselines, used for calibrating far more extensive CFd and model test data, is determined in sea trial. We tend to take sea trials as »the truth«, but Sofia Werner (SSPa) showed that there can be deviations of 10% between sea trial measurements of sister vessels as per iSo 15016. These deviations may have causes in actual differences in the as-built state of the sister vessels, but also in uncertainties of sea trial procedures. all models are wrong, even those based on sea trials. But maybe they are still useful and the best we have. one has to have a reference, after all. a key message from HullPiC 2020 was yet again that hull & propeller performance management is not just about numerical statistics, it and engineering analytics. The human factor is increasingly acknowledged within organizations and taken into account. an important and good development. »Monitoring alone does not help much, it is the actions and processes standing behind the observations that are most relevant«, says Falko Fritz (SkySails Marine Performance). Shipping companies need staff and processes to monitor and optimize hull & propeller performance, so that they can review investments in retrofits properly and choose appropriate antifouling solutions to avoid excess consumption. Even though the audience of HullPiC believed that premium antifouling could reduce global emissions by 10% and more, many shipping companies do not invest here. Why? one reason is simply lack of awareness. Hull fouling assessment is not addressed at university courses. © Zorn et al Performance matters increasingly digitalization is moving forward, also in shipping. in a charterer market, effcient vessels are more likely to get a contract. »We run pre-charter assessments, using vessels operational data«, says Martin Köpke (Hapag-lloyd). The industry realizes the importance of analyzing fuel performance systematically. »We now have one dedicated specialist for vessel performance matters looking across the fleet in our company«, as Barbara Stoess (Sloman Neptun) stated. Good hull performance is also important when giving a vessel in a pool. Ship owner’s income depends on the vessels pool points which are in general influenced by the observed speed and consumption. a significant performance improvement increases the revenue measurable. Finally, at HullPiC forum discussed the future of iSo 19030. The standard stood at the beginning of HullPiC. The love-hate relationship with the standard continued. There is consensus about the unhappiness concerning iSo 19030, but little consensus on how to change the standard. However, the review of the standard is pending. in Europe no one seems to be willing to take the lead. at HullPiC, it was discussed that any likely revision may be driven by South Korea. analytics are moving forward using more sophisticated models. all models are wrong, some are still useful and will be discussed at HullPiC 2021, rumored to be held in italy. n 44 HaNSa – international Maritime Journal 01 | 2021

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