Page 50 - European Energy Innovation - Spring 2015 publication
P. 50
Spring 2015 European Energy Innovation


Green retrofitting of existing ships
The underlying idea of the
REFRESH1 was to identify in the systems’ performance, hence on-board of a DST4 for efficient
retrofitting solutions providing a benchmark for future tasks, operation based on DEM5.
considering mutual interaction such as optimisation.
of integrated shipboard systems and The tool installed on-board a RoPax
functions or services. The concept In REFRESH, the optimisation of energy ship aims to use parametric models
of integration of multiple solutions performance was carried out for a of the ship propulsion and auxiliary
constituted the central concept and the number of systems (such as cooling plant as well as live feeds from
driving force of the project. Obviously, system for a VLCC2 or HVAC3 system the navigational system and ship’s
the idea of assessing impact of local of a passenger ferry), but the most automation data to identify operational
changes (i.e. retrofitting) on overall complete studies were undertaken for a deficiencies in. Once the efficiency
performance had not been new but cargo handling system of an oil tanker. issues are properly evaluated the
REFRESH aimed at bringing the concept These studies involved the optimisation tool produces a list of actions and
into a new level. The goal was to move of the system’s topology as well as its recommendations for improving
beyond simple integration of physical sizing and operational efficiency. energy efficiency in operation.
components into energy models. Furthermore, the system stores the data
One of the major difficulties in for use in finding retrofitting solutions
The work carried out within the first half assessing energy performance of ship for the efficiency failings originating
of the project resulted in developing systems is the amount of data required in suboptimal performance of the
a versatile computational platform. for running simulations and validating systems’ components.
The software brings together the rapid results. Accuracy of numerical
modelling techniques (implemented predictions is highly dependent on The above description would not be
earlier within the EU-funded project both the quality of the data and the complete without mentioning major
TARGETS) with a powerful sensitivity resolution of the models. Furthermore, difficulties encountered during the
framework. This allows a thermo- high-resolution models often produce project’s execution. Most of these
hydraulic network (fully integrated large amount of data that is used as stemmed from the project’s inherent
with an electrical grid, a control layer final results or just for quality control. over-reliance on operational data,
and top-level functions, such as Operational data is also necessary which proved to be far too scarce and
propulsion) to virtually reproduce any for validation and verification of the too unreliable to provide the basis for
level of complexity to be assessed predictions, and all this results in a accurate assessment and generalisation
for energy performance as well as need for efficient technologies for data of the results. Other information-
for system integrity. The framework storage and information management. related challenges were encountered
identifies important interactions This complex task was addressed while calibrating numerical models as
between components and physical within the project by a dedicated well as during the installation of the
parameters (e.g. heat-exchange or flow team aiming to develop a database DST (backward compatibility of data
characteristics) playing dominant role solution, universal enough to meet the exchange interfaces within onboard
needs of various partners and different automation systems). The latter issue
applications. An additional requirement may require paying particular attention
imposed to the development of the for the regulatory framework on
database was to make it compatible monitoring, reporting and verification.
with advanced data-mining techniques On the other hand, the troublesome
and probabilistic modelling (Bayesian reliance highlights the importance of
Network). For this, in REFRESH the numerical prediction (combined with
suitability of data-intensive models in targeted audits) and use of sensitivity
retrofitting problems was investigated analysis for (educated) decision making
in parallel to parametric modelling. in retrofitting, both applied during the
course of the project. l
All the tools and methodologies
developed or refined in the project 1 7 FP EU funded project
were brought together, unveiling the 2 Very Large Crude Carrier
required strategy for handling the 3 Heating, Ventilation and Air Conditioning
whole energy modelling application 4 Decision Support Tool
process, which allows the installation 5 Dynamic Energy Models
6 Energy Saving Potentials

Decision Support Tool on-board
RoPax Olympic Champion
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