Items · Journal of Marine Technology and Environment

GENERATING A MESH TO DETERMINE THE BATHYMETRY IN THE HARBOUR

Andreea-Irina IGNAT; Mariana PANAITESCU; Fănel-Viorel PANAITESCU; Ionut VOICU; Jana PAŘÍLKOVÁ

10/1/2023

10.53464/JMTE.02.2023.07

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

In this paper we present the steps to determine the bathymetry in the harbour. For this we can use software MIKE Zero to create various meshes, each designed to apply for a special modelling task. The bathymetry mesh is created from scratch and optimised to a satisfactory .

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ASSESSMENT OF THE QUALITY OF THE AQUATIC ENVIRONMENT IN THE AREAS BORDERING THE DEVELOPMENT OF FISHING ACTIVITIES

Simona GHIȚĂ; Irina STANCIU; Adrian SABĂU; Sabina ZĂGAN; Iuliana ȘUNDRI

10/1/2023

10.53464/JMTE.02.2023.06

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

In the present study, the main physical-chemical parameters (temperature, conductivity, turbidity, pH, dissolved oxygen, biochemical oxygen consumption, ammonium, nitrate and phosphate ions) and the representative groups of phytoplankton (green algae, cyanobacteria, diatoms and cryptophytics) are analysed with direct influence on the quality of aquatic life. The average values obtained by analysing the samples collected in July 2023 in the bordering area of fishing activities (marine site –Midia-Navodari area and Lake sites – Tasaul Lake and Siutghiol Lake) are presented and discussed. The modern techniques of in situ analysis of the physical-chemical and biological parameters of the water allowed an evaluation of the quality of the surface waters regarding the trophic potential. The optimal values of the indicators of the eutrophication regime and of the oxygen regime, as well as the presence of the main groups of primary producers, suggest the existence of favourable conditions for the development of fishing and aquaculture activities. The study contributes to the achievement of the general objective of the Dobrogea North FLAG strategy for the development of fishing activities based on the knowledge of environmental aspects, in order to maintain economic and ecological sustainability.

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STUDY OF HYDRO-METEOROLOGICAL CONDITIONS AND FUEL CONSUMPTION ON THE USUAL TRADING ROUTES OF VLCC (VERY LARGE CRUDE CARRIERS

Iulian ENE

10/1/2023

10.53464/JMTE.02.2023.05

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

In this paper will be introduced some of the usual worldwide navigation routes of VLCC type vessels, with presentation of the data collected by the author on the voyages made by a ship with DWT = 307284 tons, during the period December 2015 – December 2018. For reasons of relevance, trips to the high seas lasting more than 7 days were chosen as much as possible. The objective is to investigate the usual hydro-meteorological conditions on some of the main trading patterns of the VLCC - Very Large Crude Carriers, (vessels intended for the transport of crude oil, with a carrying capacity of approximately two million barrels, DWT approximately 270000 - 330000 tons). Diagrams and tables with data collected are also presented. This may be of further assistance in studying the opportunities of using renewable energy sources, in particular the wind one, in order to improve the energy efficiency of such voyages.

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SEARCH AND RESCUE AUTONOMOUS VESSEL

Ovidiu CRISTEA; Ștefan-Vlăduț ONEA; Silviu Nicolae POPA

10/1/2023

10.53464/JMTE.02.2023.04

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

Search and rescue operations in maritime environments are critical for saving lives and ensuring the safety of individuals in distress. The advancement of autonomous technologies has led to the development of Search and Rescue Autonomous Vessels (SRAVs), which have the potential to revolutionize the efficiency and effectiveness of such operations. This paper presents an example of the design, capabilities, and challenges associated with SRAVs. The integration of various sensors, communication systems, and artificial intelligence algorithms allows these vessels to navigate autonomously, detect and identify distress signals, locate survivors, and provide immediate assistance. Also, there are presented results from testing the SRAV and future development perspective.

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FOUR-BAR MECHANISM FOR A PORTAL CRANE: A BRIEF OVERVIEW

Milis Nilgun CAIBULA; Constantin MILITARU; Sorin CĂNĂNĂU

10/1/2023

10.53464/JMTE.02.2023.03

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

The present article aims to increase knowledge of a four-bar mechanism. A four-bar system is a planar mechanism. There are many types of simple mechanisms, such as: Chebyshev, Chebyshev lamda, Hoecken, Roberts, Watt’s, Grasshopper, horse-head, pantograph and Peaucelier. More complex mechanisms are: Stewart platform or Jansen’s linkage. The determination of the degrees of freedom (DOF) for a system is done using the Chebychev-Gruebler-Kutzbach relationship. Due to this fact, the DOF for the four-bar system has the value one. Moreover, we analyze the following angles: θ, α, β and φ3in the mechanism. Finally, using Matlab software the drawing and the dynamic simulation of a four-bar mechanism is carried out. Besides, the dynamic simulation is represented after 3s, 6s and 12s.

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THE GREEN SHIPPING. STUDY ON REGULATIONS AND SUSTAINABLE OPTIONS FOR DECARBONISATION

Grațiela BRÂNZĂ

10/1/2023

10.53464/JMTE.02.2023.02

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

The maritime sector is responsible for more than 90% of world trade. This generates increasing international shipping fleet, that means significant contribution to environment pollution. In this context, appears the need for a cleaner maritime transport, a green one. The paper presents the concepts of “green shipping”, “eco-ship” and regulations that must be respected in relation to environment protection. This study highlights also the IMO’s regulations for green shipping, as IMO is the most important organization that support the reduction of greenhouse gas emissions from ships. The work examines briefly few options for decarbonisation in shipping, outlining the role of government policies, for huge investments in new and clean technologies and, also, in infrastructure for the production, distribution and utilisation of alternative marine fuels and biofuels.

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THE ROLE OF SOCIAL MEDIA IN USER HEALTH

Mihaela-Luminița BĂRHALESCU, Elena COSTESCU

10/1/2023

10.53464/JMTE.02.2023.01

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

Human beings are social creatures. We need the company of others to thrive in life, and the power of our connections has a huge impact on our mental health and happiness. Being socially connected to others can alleviate stress, anxiety and depression, increase self-esteem, provide comfort and joy, prevent loneliness and even add years to your life. On the other hand, the lack of strong social connections can pose a serious risk to your mental and emotional health. In today's world, many of us rely on social media platforms like Facebook, Twitter, Snapchat, YouTube, and Instagram to find and connect with each other. While each has its benefits, it's important to remember that social media can never be a substitute for real-world human connection. It takes personal contact with others to trigger the hormones that relieve stress and make you feel happier, healthier, and more positive. Ironically, for a technology that's designed to bring people closer together, spending too much time interacting with social media can make you feel lonelier and more isolated — and exacerbate mental health issues like anxiety and depression. If you spend an excessive amount of time on social media and feelings of sadness, dissatisfaction, frustration or loneliness are affecting your life, it may be time to re-examine your online habits and find a healthier balance.

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AN ATTEMPT TO IMPROVE ENERGY EFFICIENCY OF VAPOUR COMPRESSION REFRIGERATION ON SYSTEMS WORKING WITH R134a

Ionela TICU; Elena GOGU

4/1/2023

10.53464/JMTE.01.2023.10

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

Refrigeration is an industry of high importance in our modern times. It plays also a key role in maritime transport of perishables, where vapour compression refrigeration systems are dominant. These energy systems are indispensable, but they should be wise exploited because their high energy necessity. One of the frequent refrigerant chemical adopted in this system is the hydrofluorocarbon R134a. This refrigerant came to substitute traditional refrigerants, such as chlorofluorocarbons or hydro chlorofluorocarbons – substances being under environmental regulations. In this study, it is approached a single stage vapour compression refrigeration system working with R134a. The aim is to find the conditions in which this system is more energy efficient. In this respect, based on the laws of thermodynamics, are obtained information on Coefficient of Performance and energy destruction trends – when the evaporator temperature increases. Our results indicate that, although the analysis based on the first law of thermodynamics reveals that the performance of the system is higher for high evaporator temperatures, the energy destructions in this system increase together with the evaporator temperature increase.

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PERFORMANCE ANALYSIS OF INERT GAS PLANT WITH SCRUBBER USING ANSYS FOR A VLCC SHIP

Liviu Constantin STAN; Cătălin FAITAR

4/1/2023

10.53464/JMTE.01.2023.09

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

Through the 1978 SOLAS Protocol and then through the introduction of amendments from 1981 and 1983, new specifications are brought regarding the design, operation, maintenance, verification of inert gas systems intended for both oil tanks and bulk chemical tanks, and, in general, the systems of safety on board ships carrying dangerous goods. The inerting method using a gas system with generator and scrubber involves a continuous and very efficient process, with a low level of supervision and maintenance, that is why this type of installation was chosen in this study. Installations with a scrubber type unit require the installation of an inert gas generator that operates at a pressure of 8-10 bar and releases nitrogen at 7-9 bar. The quality of the air will depend on the type of generator used, scrubber type unit, but air without impurities with the best possible quality is recommended. Nitrogen quality for a given unit varies with production rate and is generally 95-97% pure. By connecting high-quality scrubbers, nitrogen can be brought to 99% purity, but at lower production rates and much higher energy consumption rates of any system on board ship is specifically identified with its reliability. So as to get the best out of marine motors, it is critical to screen their performances and take measures to accomplish productive combustion. As a result of heat gains on board ships from engine rooms and crew, the increase in humidity as well as due to the various releases of gases from on board systems, room air deteriorates, requiring replacement and its processing through the HVAC (heat, ventilation and air conditioning) system. The combustion process in diese.

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NUMERICAL SIMULATION OF CENTRIFUGAL PUMP

Andrei Alexandru SCUPI; Mariana PANAITESCU; Fănel-Viorel PANAITESCU

4/1/2023

10.53464/JMTE.01.2023.08

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

Centrifugal pumps are most commonly used pumping devices in industry their being fit for pumping water. There are several types of centrifugal pumps, their differences in construction is due to their size and how cloggy the pumped water is. In the paper it was simulated a 2D centrifugal pump of small size used in daily activities. The simulation, performed with CFD (ANSYS-Fluent), was made for different inlet velocities of water. Different parameters, such as inlet pressure, outlet pressure, maximum velocity and flow rate, were calculated and graphically represented against inlet velocity. Also, graphical representation of pressure distribution .

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FTA ON SHIP FIREFIGHTING PLANT

Mariana PANAITESCU; Fănel-Viorel PANAITESCU; Ionuț VOICU

4/1/2023

10.53464/JMTE.01.2023.07

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

One of the main causes of accidents on board ships is fire. This is because of the presence of high temperature, the excess quantity of flammable oil and other combustible materials. A ship is fitted with various types of fire retardant and firefighting equipment so as to fight any kind of fire and extinguish it as soon as possible before it turns into a major catastrophic situation. Purpose: This paper presents the crisis management on ship’s firefighting plant, Technical data for firefighting plant with foam, Fault Tree Analysis data, Fault tree block diagram, Failure probability and basic events of fault tree, The equations of fire analysis, The method of simulation, The simulation of a fire incident in the firefighting plant, for a ship named "Mamola Defender" which is a vessel that provides the supply of marine drilling platforms. The results are: Foam firefighting plant diagram, Locations for firefighting systems, Fire Control and Safety Plans, Fault tree block diagram, The values of probabilities, The relationship between input and output events. The results of simulation for a scenario are: radiant heat distribution of a jet fire, the heat flux, the temperature distribution on different stage of fire, the flame propagations. Conclusions: The methods which used for simulation present a possible fire incident in a plant with many hazardous materials. This method of simulation is useful to assistance plant owners and operators in different events of emergency situations. This methodology is useful to prevent human casualties and important structures.

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RELIGIOUS BELIEF, SCIENTIFIC REASONING AND ABILITY OF MAN TO SOLVE CLIMATE AND ENVIRONMENT ISSUES

Cătălin Silviu NUTU

4/1/2023

10.53464/JMTE.01.2023.06

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

This paper presents the main complicate science issues man has to solve, but it also presents reasons to explain his present incapacity to solve them. It also shows ways to address more successfully those complicate issues, in order to find their solutions.

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THE LOGIC OF HAPPINESS AND ITS RELATIONSHIP WITH ENVIRONMENTAL AND CLIMATE ISSUES

Cătălin Silviu NUTU

4/1/2023

10.53464/JMTE.01.2023.05

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

This paper is concerned with the logic of happiness, whereas happiness is most commonly seen by man as a function of fulfilled wishes. It also shows the disastrous consequences for man and his home planet when engaging in this damaging way to search for happiness. This paper also shows that the main reason for consume and overuse of planet’s resources is that man has been trained to consumerism by various tactics and strategies which were applied to him in the recent past, with the purpose of making him “successful” and a “good” citizen. This paper also provides some more conventional and some more nonconventional solutions to undone this evil of the “induced” necessity to consume in order to be happy.

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HURDLES IN APPROACHING SCIENCE AND IN SOLVING CLIMATE AND ENVIRONMENT ISSUES

Cătălin Silviu NUTU

4/1/2023

10.53464/JMTE.01.2023.04

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

Showing complicate issues in science, like the strange facts and realities pertaining to the quantum world, this paper explains why it is so difficult to understand and to solve those complicate issues. This paper also stresses the important fact, that in order to understand these strange realities pertaining to the quantum phenomena but also in order to solve other complicate problems of science such as the climate change issues, one should give up the traditional way of thinking of the science and should also renounce the false idea of the rationalism, stating that the entire reality can be known and understood by using scientific reasoning.

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EVALUATION OF THE SPECIFIC HEAT CAPACITY (SHC) OF WATER-Al2O3 NANO FLUIDS BASED ON A THEORETICAL MODEL

Feiza MEMET

4/1/2023

10.53464/JMTE.01.2023.03

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

Adding of nanoparticles in a base working agent leads to Nano fluids representing of a new type of working fluid. Due to an increase surface area, there is a gain in the surface area needed for heat transfer between nanoparticles and base fluid. Sein the poor heat transfer properties of water, water base Nano fluids present improved heat transfer performance and require smaller heat exchangers. This paper deals with the estimation of specific heat transfer capacity of water-Al2O3 Nano fluid. The decrease of volume concentration, from 13% to 3%, will reveal a gain in SHC of 27% - for nanoparticles diameter of 60 nm and a gain of 40% - for 30 nm diameter. At high temperature, SHC shows better values, also when the volume concentration is lower.

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THE IMPACT OF THE PHENOMENON COVID-19 ON THE MENTAL HEALTH OF SEAFARERS

Alina-Lucia BOSTINA

4/1/2023

10.53464/JMTE.01.2023.02

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

This paper aims to highlight the devastating impact of the imposed restrictions during the COVID-19 Pandemic towards the mental health of the sailing crew. It is well known that the employees in the navy domain were already accustomed to distinct working conditions, depriving themselves of factors that are vital for a balanced, functional state of mental health. The seamen are subjected to solitude, uncertain and unpredictable weather, a constant fear of danger and the anxiety of being prepared to ensure their own safety at any time needed. This paper aims to highlight the devastating impact of the imposed restrictions during the COVID-19 Pandemic towards the mental health of the sailing crew. Isolation, research shows, has an impact on both mental and physical health, from reducing the ability to manage stressful situations, to difficulties in making decisions, memorizing and processing information to the onset of depression, anxiety, attacks of panic and increasing the risk of illness, because the immune system of a person responds differently in the fight against viruses. In this paper were presented the procedures that the crew members of the ships that made voyages in the areas where the imposed restrictions were among the toughest to follow. Also, the mental state of the crew during the voyage and after arrival were analyzed, from in terms of the staff's statements but also individually.

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THE ROLE OF CAREER COUNSELORS IN VOCATIONAL EDUCATION

Nicoleta ACOMI; Ovidiu ACOMI; Roxana IANCU

4/1/2023

10.53464/JMTE.01.2023.01

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

Passing from school to the labour market requires support, advice, and guidance. The rapid advancement of technology in the maritime industry, the wide range of duties, and ever-changing job placement from ashore to remote sites or on board vessels, put many treats on the future employees. This article describes how career counselling is integrated into the process of supporting VET learners in making decisions about future careers in three European countries and how this process is perceived by learners. The research comprised a literature review to reveal the approach with regard to career counselling and analysis of data collected with a survey questionnaire. The 88 responses emphasized learners' views regarding the career counsellor’s actual role and provided an understanding of their expectations for making the transition toward the labour market. The questions addressed groups of people that decided to continue their studies and get a job and those undecided. Participants explained the motivator factors for making the career choice, the main sources of career information, and their expectations from the future job. This article explores the extent to which the professionals and counsellors would contribute to making the decisions and the types of interaction that are expected to produce positive results and engagement. The results indicate that teachers and parents are currently contributing to making the final career decision. Even though, the input of professionals is highly expected by all groups of participants. Respondents emphasized that challenges, dynamism in the workplace as well as the variety of tasks are those factors that would make them stay in a job. The authors concluded that to be effective, the career counselling of young learners needs to be enriched with jobspecific insights provided by professionals. The research conclusions draw up the VET learners' main expectations that can be used to guide further career counselling activities.

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MARINE ECOSYSTEMS ASSESSMENT AND CLIMATE CHANGE

Florentina-Aurelia VASILICĂ; Mariana PANAITESCU; Fănel-Viorel PANAITESCU

10/1/2022

DOI: 10.53464/JMTE.02.2022.10

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

In this paper there are analyzed ecosystem status characteristics, pressures and impacts, risk matrix for a marine ecosystem . The methodology is a new tool for assessing the state of the environment [1], [2]. The results are descriptive indicators of the analyzed ecosystems, wich were calculated by classical methods and computer applications [3], [4], [5], [6], [7]. Using information about these descriptive indicators, the ecological status of the marine ecosystem was assessed, calculating the risk matrix [5], [6]. Finally, it can observed that in the marine environment, the reconfigurations will have a tailor-made impact. The most affected will be the Black Sea fauna.

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SOME ASPECTS REGARDING THE OPTIMIZATION OF THE WIND TURBINE’S VIBRATION SYSTEMS

Alexandru-Andrei SCUPI; Paula-Gabriela PANAIT; Mariana PANAITESCU; Fanel-Viorel PANAITESCU ; Mihael CHIRCOR

10/1/2022

DOI: 10.53464/JMTE.02.2022.09

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

The development of monitoring of vibration’s system of wind turbines is an important stage for operational details. In order to highlight the innovations made in these systems, their structural elements must be analysed (characteristics and classification of sensors, monitoring and analysis of structure, conditions for monitoring program). In order to measure vibrations in wind turbines, a correct and continuous monitoring of the functional state of each element in the structure is necessary. In this paper are presented investigations for wind turbines from wind farm Mireasa, South-East region of Romania, to determine the conditions of the drivetrain and highlight any potential developed problems.

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FRACTALS. ORIGINS AND HISTORY

Cătălin Silviu NUTU; Tiberiu AXINTE

10/1/2022

DOI: 10.53464/JMTE.02.2022.08

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

Fractal shapes can be found everywhere around us in Nature, at small scale microscopic level, at normal scale observable with the naked human eye, but also at very large scale level, when looking at very far distant galaxies. As it will be presented in this paper, there is an inherent relationship between fractal structures in Nature and the harmony perceived by human eye in the structures of Nature. Although not explicitly formulated until late XII century by Fibonacci, the very same Golden Proportion had been already approached by the ancient Greeks. This Divine Proportion which can be found around us in Nature, represents the base for the latter concept of fractal and is also the link between early mathematics and advanced fractal mathematics. Some of the first ideas about harmony and proportions are dating back in Antiquity and they were promoted by the ancient Greeks in their philosophical schools, by scholars like Euclid, Thales and Pitagora. Although the concept of fractal it is a rather young one, being introduced by Mandelbrot in the ‘70s of the XX th century, the origins of the concept of fractal seem to be found, much earlier, in the aforementioned philosophical schools. In their philosophical schools, the antics, as far as we know, beginning with the Greeks, had discovered and used the concepts of proportion and harmony, in certain proportions they worked with. One such proportion is represented by the Golden Ratio.

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ANALYZING A BLACK SEA NAVAL ACCIDENT THROUGH THE STAMP METHOD

Valerian NOVAC; Eugen-Victor-Cristian

10/1/2022

DOI: 10.53464/JMTE.02.2022.07

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

The article presents an in-depth analysis of the most significant accident ever in Constanta harbour using a method that goes beyond the chain of events that trigger an accident. In the introductory part, the authors present the features of the Black Sea basin, highlighting the eventual dangers to the ship's safety. Then the work presents the Systems Theoretic Accident Model and Process - STAMP method in brief; after that follows the modelling and analysis of the accident of You Xiu ship, and the scoop culminates with some short concluding remarks. The article serves as a base for further developments in accident analysis and an awareness instrument for scholars and practitioners regarding the general safety culture when operating a ship. Nevertheless, the work in this regard requires further research, and a comparative study using different methods and approaches should add more value to the actual efforts of the authors.

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MARITIME ACCIDENTS IMPACT ON MARINE ENVIRONMENT. A CASE STUDY OF THE ROMANIAN COAST OF THE BLACK SEA

Laura NEDELCU; Eugen RUSU

10/1/2022

DOI: 10.53464/JMTE.02.2022.06

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

The safety of maritime transport in the vicinity of the coast or in the seaport area requires special attention due to its damaging effects on the marine environment. Disruption of underwater food chains, emissions of harmful gases, underwater noise, oil or oil products spillage, alteration of hydrographic conditions, and waste disposal are some of the main effects of maritime transport. The shipping pollution on the environment include 4 types: air, water, acoustic and oil spills, having disastrous consequences not only on the environment but also on the economic and social side. Increasing awareness of the impact of marine pollution has led to a decrease in the frequency of spills as well as a significant decrease in the amount of oil spilled. The main purpose of this research is to analyse and determine the maritime accidents impact on the marine environment.

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METHODOLOGY FOR ENERGY EFFICIENCY IMPROVEMENT OF SHIP MOTOR DRIVEN SYSTEMS

Elena KATELIEVA

10/1/2022

DOI: 10.53464/JMTE.02.2022.05

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

The methodology proposed in this paper identifies the main steps that can be taken for energy efficiency improvement of ship motor driven systems. It is necessary to follow the principles of systematic approach, taking into account the efficiency of each element and the system as a whole. We need to collect baseline data, to make assessment of the system performance and choose the most appropriate optimization measures. The proposed approach shows the main activities and technologies that could optimize the overall energy efficiency of the system. Ship motor driven systems are one of the largest consumers of electricity on the ship and improving their efficiency will reduce energy consumption and emissions from ships.

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ASSESSMENT OF THE SOLAR ENERGY POTENTIAL IN THE ROMANIAN NEARSHORE

Michael FRATITA; Florin POPESCU; Eugen RUSU

10/1/2022

DOI:10.53464/JMTE.02.2022.04

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

In December 2019, the first official European Green Deal document was released, which aims to reduce greenhouse gas emissions gradually by 2050, when the carbon neutrality target should be reached. The aim of the paper is to analyse the possibility of implementing solar farms in Romania with particular interest for the nearshore area of the Black Sea. Moreover, it is analysed the current status of electricity generation sources in Romania, the profile of consumers connected to the National Energy System (NES), and the electricity injected into the grid through solar farms. On the other hand, the possibility of intermittent injection of energy into the grid and the effects on the stability of the national energy system are analysed.

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WASTE RECOVERY SYSTEM ECONOMICAL ANALYSIS FOR DUAL FUEL ENGINE FITTED ON BOARD A LNG TANKER

Cătălin FAITĂR; Eugen-Victor-Cristian RUSU; Nicolae BUZBUCHI; Liviu-Constantin STAN; Cosmin-Laurenţiu DUMITRACHE

10/1/2022

DOI:10.53464/JMTE.02.2022.03

Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced technologies for MET; Climate changes

The study aіms to address іssues related to the constructіon of shіps specіalіzіng іn the transport of lіquefіed natural gas or oіl tankers. Thіs type of shіp has had and stіll has a dynamіc іn іts operatіon, and іt іs more and more іntense, due to the growіng energy needs especіally іn the hіghly developed economіes of the world. The number of transportable LNGs currently exceedіng a loadіng capacіty of 100,000 m3 has already exceeded the 300 thresholds. From the fіrst shіp destіned for the transport of lіquefіed natural gas, Methane Pіoneer, of 4500 m3, thіs sector has been permanently subjected to new challenges and technologіes. The sіze of the shіps has grown contіnuously, wіth tanks exceedіng 200,000 m3 beіng buіlt іn recent years, such as Qatar Gas Q-flex shіps wіth a transport capacіty of 265000 m3.

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