UGO CAMPORA

In this study two four-stroke marine diesel engines, characterized by very similar nominal power and speed, but with very different trend of the power lint curve and specific fuel consumption contours in the engine load diagram, are compared by simulation, using each of them as an alternative to the other engine, for the motorization of a...

The article compares between them three diesel-electric propulsion and power generation systems, characterized by a similar overall power but with diesel-generator sets very different in number and power; these systems are developed for the needs of an existing pleasure craft. In addition, each system configuration includes two versions, with...

The paper reports the comparison between diesel-electric and mechanical propulsion plants, employed to a small cruise ship propulsion. The plants prime movers are the Rolls-Royce Bergen marine diesel engines. Both engine versions, characterized by similar rated power but different power lint curve and specific fuel contours trend in the...

The paper analyses some advantages of the hybrid ship propulsion, enhanced by the use of some energy recovery technologies. The concept design of a power plant for a Ro-Ro ferry is presented as a case study, since this particular ship can best take advantage of the operational flexibility of this propulsion type. As an element of innovation,...

The feasibility study of an integrated COmbined Gas Electric and Steam-reciprocating engine propulsion plant for a Liquified Natural Gas (LNG) fueled cruise-ferry is assessed in this paper. Specifically, the purpose of this work is to respond to GNV shipowners' need to equip ships with a propulsion system highly efficient in a wide ship...

This paper focuses on potential benefits due to the Waste Heat Recovery (WHR) from marine dual fuel engines. WHR solutions are usually adopted for the traditional diesel oil applications, while for gas fueled engines are currently under consideration (mainly due to the relatively high investment costs). In order to promote this ecofriendly...

In recent decades, the design of ship propulsion systems has been focusing on energy efficiency and low pollutant emissions. In this framework, diesel–electric propulsion has become a standard for many ship types and has proven its worth for flexible propulsion design and management. This paper presents an approach to the optimal design of...

Waste Heat Recovery (WHR) marine systems represent a valid solution for the ship energy eciency improvement, especially in Liquefied Natural Gas (LNG) propulsion applications. Compared to traditional diesel fuel oil, a better thermal power can be recovered from the exhaust gas produced by a LNG-fueled engine. Therefore, steam surplus production...

From the working data of a dual-fuel marine engine, in this paper, we optimized and compared two waste-heat-recovery single-pressure steam plants—the first characterized by a saturated-steam Rankine cycle, the other by a superheated-steam cycle–using suitably developed simulation models. The objective was to improve the recovered heat from the...

The study aims to investigate the effects of the steam plant components deterioration in a marine Waste Heat Recovery (WHR) system. WHR technology can significantly improve the energy efficiency of merchant ships, because it allows to recover thermal energy from the exhaust gas of the main diesel engines, in order to produce electric energy...

The performance of a marine dual-fuel engine, equipped with an innovative hybrid turbocharger producing electric power to satisfy part of the ship's electric load, is presented by a simulation comparison with the traditional turbocharging technology. The two distinct fuel types, combined with the hybrid turbocharger, involve a substantial...

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The present study deals with the computational simulation of a marine four-stroke dual-fuel engine, working both in diesel and natural gas modes, with a particular focus on the turbocharger system behaviour. The engine model, developed by the authors, was implemented as a computer code and used to compare the performance of the engine when...

In recent years, diesel-electric propulsion has become a standard for many ship types. The traditional way to manage the electric flow onboard is by using AC distribution, and to run diesel generators at constant rotational speed to get the correct distribution frequency and to limit the weight and the size of the electric machinery. More...

The paper presents an original variable layout steam plant for the Waste Heat Recovery (WHR-VL) from marine dual fuel (DF) engines, designed considering the different exhaust gas stack temperature limits, depending on the engine fuel type: generally no less than 160 °C for diesel oil and without limits for natural gas (NG). Using diesel oil, a...

Nowadays alternative and innovative energy recovery solutions are adopted on board ships to reduce fuel consumption and harmful emissions. According to this, the present work compares the engine exhaust gas waste heat recovery and hybrid turbocharger technologies, which are used to improve the efficiency of a dual-fuel four-stroke (DF) marine...

The article deals with a simulation approach to the representation of the ship motions in waves, interacting with the propulsion system behaviour (diesel engine and propeller). The final goal is the development of a simulator, as complete as possible, that allows the analysis of the main engine thermodynamics in different sea conditions and the...

A turbocharged diesel engine numerical model, suitable for real-time ship manoeuvre simulation, is presented in this paper. While some engine components (mainly the turbocharger, intercooler and manifolds) are modelled by a filling and emptying approach, the cylinder simulation is based on a set of five-dimensional numerical matrices (each...

In this paper, a fully electric marine propulsion system is compared with a hybrid (mechanical-electric) one, concerning a Ro-Ro ferry application. Both solutions employ variable speed electric generators, fueled by natural gas. In additions, waste heat recovery from the exhaust gas of the thermal engine and an innovative hybrid turbocharger...