Lidija Runko Luttenberger, I. Ančić, A. Luttenberger
Biodiversity as a planetary boundary and sustainability are strongly related to fish stocks and fisheries that are regulated by a number of sources of law with the aim of achieving their sustainability. The paper analyses current application, impact and effectiveness of the Common Fisheries Policy that sets the rules for fishing fleets management in the European Union and for fish stocks conservation as well as the 2020 Report on its implementation by the European Court of Auditors. It also examines the present and potential implementation and effects of Blue Growth, Marine Strategy Framework Directive, United Nations legal framework and Sustainable Development Goals on fisheries and aquaculture activities in the Adriatic Sea, a semi-enclosed and biodiversity rich sea. Improvements in implementing marine ecosystem approach and marine spatial planning are proposed in policy and regulatory framework, focusing on characteristics of the Adriatic Sea. Resilient solutions require placing more focus on characteristics of regional seas and applying site-specific tailor-made solutions and less complex but efficient governance for the seas which entail integrated approach to exploitation and preservation of the resources and their health.
{"title":"The challenges for Croatian fisheries within current regulatory environment","authors":"Lidija Runko Luttenberger, I. Ančić, A. Luttenberger","doi":"10.31217/p.35.1.18","DOIUrl":"https://doi.org/10.31217/p.35.1.18","url":null,"abstract":"Biodiversity as a planetary boundary and sustainability are strongly related to fish stocks and fisheries that are regulated by a number of sources of law with the aim of achieving their sustainability. The paper analyses current application, impact and effectiveness of the Common Fisheries Policy that sets the rules for fishing fleets management in the European Union and for fish stocks conservation as well as the 2020 Report on its implementation by the European Court of Auditors. It also examines the present and potential implementation and effects of Blue Growth, Marine Strategy Framework Directive, United Nations legal framework and Sustainable Development Goals on fisheries and aquaculture activities in the Adriatic Sea, a semi-enclosed and biodiversity rich sea. Improvements in implementing marine ecosystem approach and marine spatial planning are proposed in policy and regulatory framework, focusing on characteristics of the Adriatic Sea. Resilient solutions require placing more focus on characteristics of regional seas and applying site-specific tailor-made solutions and less complex but efficient governance for the seas which entail integrated approach to exploitation and preservation of the resources and their health.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47760861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Coastal line maritime passenger transport in the Republic of Croatia, as well as in other EU member states, is regulated through various regulations and legislation, which in turn result in numerous national laws and regulations that affect its development, all of which is legally binding for shippers. Scheduled maritime passenger transport is an extremely important form of transport for the Republic of Croatia since it is the only form of connection with the mainland for many islands. This paper analyses economic policy measures that affect the organization and implementation of coastal line maritime passenger transport. The paper also investigates the demand fluctuation for maritime passenger transport services. The aid measures provided by the state to individual sectors is also analysed, as well as aid for the provision of services of general economic interest. The aim of this paper is to assess the amount of aid granted to maritime transport and its importance, especially in coastal line maritime passenger transport. The paper also explains the importance of establishing the Coastal Liner Services Agency as a regulatory body of the Republic of Croatia, and it further analyses the subsidy amounts granted to shippers in the period from 2014 to 2020.
{"title":"The impact of economic policy on shipper businesses in coastal line maritime passenger transport in Croatia","authors":"Alen Jugović, Dea Aksentijević, P. Zaninović","doi":"10.31217/p.35.1.9","DOIUrl":"https://doi.org/10.31217/p.35.1.9","url":null,"abstract":"Coastal line maritime passenger transport in the Republic of Croatia, as well as in other EU member states, is regulated through various regulations and legislation, which in turn result in numerous national laws and regulations that affect its development, all of which is legally binding for shippers. Scheduled maritime passenger transport is an extremely important form of transport for the Republic of Croatia since it is the only form of connection with the mainland for many islands. This paper analyses economic policy measures that affect the organization and implementation of coastal line maritime passenger transport. The paper also investigates the demand fluctuation for maritime passenger transport services. The aid measures provided by the state to individual sectors is also analysed, as well as aid for the provision of services of general economic interest. The aim of this paper is to assess the amount of aid granted to maritime transport and its importance, especially in coastal line maritime passenger transport. The paper also explains the importance of establishing the Coastal Liner Services Agency as a regulatory body of the Republic of Croatia, and it further analyses the subsidy amounts granted to shippers in the period from 2014 to 2020.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46988077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
With rapid industrialization, the current social system is facing a variety of crises that deplete resources, pollute the environment and generate large amounts of waste. Excessive destinations dependence on tourism, as a primary economic activity, make them more vulnerable to global crisis situations and their negative effects. The tourism industry is also sensitive to external disasters and the deterioration of the tourism product, and is becoming more exposed to the crisis, which leads to a growing interest in contingency planning. Economic crisis, the crisis in the world shipping economy and political instability represent some of the crisis situations that developed and developing countries are struggling with. The goal of the research is literature review to determine which crisis situations exist in nautical tourism, which ones occur most often and what is the cause of them. Also, by analyzing the content of selected articles, the aim is to present possible solutions to such situations, applying to a greater extent to the principles of sustainable development. This paper analyzes the scientific literature on the crisis situations and their negative effects on nautical tourism, as relatively new multidisciplinary tourism activity. Contrary to the long history of piracy, terrorist attacks, as a one type of crisis situations that occur in the maritime industry are rare. However, high-energy consumption, high water pollution and increased port production, consequently negatively affect the ecological environment. Pollution created by vessels, in addition to disrupting the natural ecological balance, also encourages climate change, therefore, ecological restoration measures can help improve the quality of the environment on land and in water.
{"title":"Analysis of crisis situations in nautical tourism","authors":"D. Gračan, R. Agbaba","doi":"10.31217/p.35.1.2","DOIUrl":"https://doi.org/10.31217/p.35.1.2","url":null,"abstract":"With rapid industrialization, the current social system is facing a variety of crises that deplete resources, pollute the environment and generate large amounts of waste. Excessive destinations dependence on tourism, as a primary economic activity, make them more vulnerable to global crisis situations and their negative effects. The tourism industry is also sensitive to external disasters and the deterioration of the tourism product, and is becoming more exposed to the crisis, which leads to a growing interest in contingency planning. Economic crisis, the crisis in the world shipping economy and political instability represent some of the crisis situations that developed and developing countries are struggling with. The goal of the research is literature review to determine which crisis situations exist in nautical tourism, which ones occur most often and what is the cause of them. Also, by analyzing the content of selected articles, the aim is to present possible solutions to such situations, applying to a greater extent to the principles of sustainable development. This paper analyzes the scientific literature on the crisis situations and their negative effects on nautical tourism, as relatively new multidisciplinary tourism activity. Contrary to the long history of piracy, terrorist attacks, as a one type of crisis situations that occur in the maritime industry are rare. However, high-energy consumption, high water pollution and increased port production, consequently negatively affect the ecological environment. Pollution created by vessels, in addition to disrupting the natural ecological balance, also encourages climate change, therefore, ecological restoration measures can help improve the quality of the environment on land and in water.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41861146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aleksandar Vorkapic, Radoslav Radonja, Sanda Martinčić-Ipšić
In this study, a framework for the application of shipboard energy efficiency monitoring, operational data prediction and reporting based on the ship’s measurement data and meteorological and oceanographic data by the geographic position and time of navigation is presented. General system theory in synergy with machine learning (ML) is used to construct the framework. The general system theory is utilized for identification and transition of components of the proposed framework of energy efficiency monitoring and prediction. A systematic investigation of the internal and external environment is conducted, and the definition of information flow between the individual components provided. Then, the external opportunities and threats that the system faces were opposed to internal strengths and weaknesses to formulate strategies in which weaknesses and threats of the system are offset by existing strengths and probabilities. After assessing the results of the strengths, weaknesses, opportunities and threats (SWOT) and threats, opportunities, weaknesses and strengths (TOWS) analysis, it can be concluded that the proposed framework is feasible and widely applicable in the maritime industry. The novelty is that the proposed framework is using on-board data processing and is integrated into the existing ship monitoring, decision-making and reporting system, thus satisfying the prerequisites for simple application.
{"title":"A framework for the application of shipboard energy efficiency monitoring, operational data prediction and reporting","authors":"Aleksandar Vorkapic, Radoslav Radonja, Sanda Martinčić-Ipšić","doi":"10.31217/p.35.1.1","DOIUrl":"https://doi.org/10.31217/p.35.1.1","url":null,"abstract":"In this study, a framework for the application of shipboard energy efficiency monitoring, operational data prediction and reporting based on the ship’s measurement data and meteorological and oceanographic data by the geographic position and time of navigation is presented. General system theory in synergy with machine learning (ML) is used to construct the framework. The general system theory is utilized for identification and transition of components of the proposed framework of energy efficiency monitoring and prediction. A systematic investigation of the internal and external environment is conducted, and the definition of information flow between the individual components provided. Then, the external opportunities and threats that the system faces were opposed to internal strengths and weaknesses to formulate strategies in which weaknesses and threats of the system are offset by existing strengths and probabilities. After assessing the results of the strengths, weaknesses, opportunities and threats (SWOT) and threats, opportunities, weaknesses and strengths (TOWS) analysis, it can be concluded that the proposed framework is feasible and widely applicable in the maritime industry. The novelty is that the proposed framework is using on-board data processing and is integrated into the existing ship monitoring, decision-making and reporting system, thus satisfying the prerequisites for simple application.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48916912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Blue development and blue economy are relatively new terms, although blue economy has been developing for centuries. Its potential on European, Croatian or regional level is huge. New researches point out that the Blue Economy impact will double in next ten years. Although present in theory since 1990ties, blue economy in last few years as a part of the answer on the global challenges, has been followed by the aspects of Green Development, Green Economy Green Growth as synonyms for desirable and necessary transition towards sustainability. The definition of Green Economy in perspective of long-term sustainability, environment protection and reduced use of natural resources is defined as well. Recognizing the importance of blue-green economy for the Primorje-Gorski Kotar County (PGKC) development, the authors describe the potentials and possibilities for development of the region, as well as analyse natural and other preconditions and point out the reached level of blue-green economy innovative sectors. The purpose of this research is to explain the importance of coastal area as a basic determinant for the blue-green economy as well as to analyze the development level of the blue-green economy in European Union, Croatia and PGKC. This paper determined the spatial, geographical, technical-technological and economical potential of PGKC, defined the regional advantages, peculiarities and limits of the blue-green economy implementation in PGKC and set the recommendations for the balanced development and maximal use of extensive regional potential.
{"title":"Greening the Blue Economy as an Incentive to Sustainable Development of Primorje-Gorski Kotar County","authors":"M. Kovačić, Lea Perinić, Srđan Kerčević","doi":"10.31217/p.35.1.17","DOIUrl":"https://doi.org/10.31217/p.35.1.17","url":null,"abstract":"Blue development and blue economy are relatively new terms, although blue economy has been developing for centuries. Its potential on European, Croatian or regional level is huge. New researches point out that the Blue Economy impact will double in next ten years. Although present in theory since 1990ties, blue economy in last few years as a part of the answer on the global challenges, has been followed by the aspects of Green Development, Green Economy Green Growth as synonyms for desirable and necessary transition towards sustainability. The definition of Green Economy in perspective of long-term sustainability, environment protection and reduced use of natural resources is defined as well. Recognizing the importance of blue-green economy for the Primorje-Gorski Kotar County (PGKC) development, the authors describe the potentials and possibilities for development of the region, as well as analyse natural and other preconditions and point out the reached level of blue-green economy innovative sectors. The purpose of this research is to explain the importance of coastal area as a basic determinant for the blue-green economy as well as to analyze the development level of the blue-green economy in European Union, Croatia and PGKC. This paper determined the spatial, geographical, technical-technological and economical potential of PGKC, defined the regional advantages, peculiarities and limits of the blue-green economy implementation in PGKC and set the recommendations for the balanced development and maximal use of extensive regional potential.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47306909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The validity of the gas turbine unit model largely depends on the accuracy of the flue gas temperature value calculation at the gas turbine inlet (TIT). This temperature is determined by the maximum combustion temperature. In variable running mode, the temperature value is regulated by changing the ratio of air and fuel at the inlet to the combustion chamber. The paper presents a model of a gas turbine combustion chamber using Modelica, an object-oriented language for modeling complex physical systems with the aim of determining the temperature of combustion flue gases, specific heat capacity, enthalpy, and flue gas composition at different gas turbine loads.
{"title":"A gas turbine combustion chamber modeling by physical model","authors":"I. Glavan, I. Poljak, M. Kosor","doi":"10.31217/P.35.1.4","DOIUrl":"https://doi.org/10.31217/P.35.1.4","url":null,"abstract":"The validity of the gas turbine unit model largely depends on the accuracy of the flue gas temperature value calculation at the gas turbine inlet (TIT). This temperature is determined by the maximum combustion temperature. In variable running mode, the temperature value is regulated by changing the ratio of air and fuel at the inlet to the combustion chamber. The paper presents a model of a gas turbine combustion chamber using Modelica, an object-oriented language for modeling complex physical systems with the aim of determining the temperature of combustion flue gases, specific heat capacity, enthalpy, and flue gas composition at different gas turbine loads.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47669641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper is dealing with predictive modeling based on predictive analytics using computer application system and the usage of the prediction results for decision-making processes. Usually the prediction is based on the experience of decision makers, but the aim of this study is to explain and proof higher predictive efficiency when using predictive analytics based on machine learning as well as more accurate future-oriented business decisions. The marina industry in Croatia is used for this research because of its complexity and necessity to predict future events that influence company success with reliable accuracy. The information for decision-making were obtained from the customer database recorded manually over the past 30 years and according to data from December 2020. The optimized prediction by the vector machine and statistical theory based on the Bayes theorem is used to support more accurate prediction. The quantitative research was carried out using the SAP Predictive Analytics (SAP PA) computer application. The results of prediction models are a perfect basis for making future-oriented strategic and tactical decisions. This research proves that, with knowledge obtained from the results of prediction models it is possible to improve the identification of the target group among applicants and customers that contribute to company success. The research provides a theoretical and an empirical contribution in the usage of predictive analytics in the marina industry in Croatia.
{"title":"Predictive analytics as a tool of controlling in decision making process in the marina industry","authors":"Uwe Lebefromm","doi":"10.31217/p.35.1.11","DOIUrl":"https://doi.org/10.31217/p.35.1.11","url":null,"abstract":"This paper is dealing with predictive modeling based on predictive analytics using computer application system and the usage of the prediction results for decision-making processes. Usually the prediction is based on the experience of decision makers, but the aim of this study is to explain and proof higher predictive efficiency when using predictive analytics based on machine learning as well as more accurate future-oriented business decisions. The marina industry in Croatia is used for this research because of its complexity and necessity to predict future events that influence company success with reliable accuracy. The information for decision-making were obtained from the customer database recorded manually over the past 30 years and according to data from December 2020. The optimized prediction by the vector machine and statistical theory based on the Bayes theorem is used to support more accurate prediction. The quantitative research was carried out using the SAP Predictive Analytics (SAP PA) computer application. The results of prediction models are a perfect basis for making future-oriented strategic and tactical decisions. This research proves that, with knowledge obtained from the results of prediction models it is possible to improve the identification of the target group among applicants and customers that contribute to company success. The research provides a theoretical and an empirical contribution in the usage of predictive analytics in the marina industry in Croatia.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47740779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Jurdana, Biserka Rukavina, Sandra Tominac Coslovich
One of the strategic development priorities of the Republic of Croatia is the development and construction of a modern telecommunications network and the availability of high-speed Internet throughout its territory, especially in rural areas and on islands. To enable this, it is important to build a reliable and resilient communication infrastructure. With the cooperation of all stakeholders in the construction, from telecom operators to local and state administrations responsible for the maritime demesne, and with efficient legislation, it is possible to achieve sustainable development of submarine cable infrastructure. The paper provides an overview of the legal aspects of submarine optical cable infrastructure design and application at the national and international levels. Special attention is dedicated to the analysis of a national legal regime regulating the protection and sustainable use of submarine cables. Thus, the authors will provide critical analysis of a kind of dualism present in the application of the Ordinance on the Register of Concessions and the Ordinance on the Register of Concessions on the Maritime Demesne and offer suggestions for potential improvements of a national legal framework pertaining to the right of laying and legally protecting submarine cables.
{"title":"Legal regime regulating the laying and protection of submarine cables in the Republic of Croatia","authors":"I. Jurdana, Biserka Rukavina, Sandra Tominac Coslovich","doi":"10.31217/p.35.1.13","DOIUrl":"https://doi.org/10.31217/p.35.1.13","url":null,"abstract":"One of the strategic development priorities of the Republic of Croatia is the development and construction of a modern telecommunications network and the availability of high-speed Internet throughout its territory, especially in rural areas and on islands. To enable this, it is important to build a reliable and resilient communication infrastructure. With the cooperation of all stakeholders in the construction, from telecom operators to local and state administrations responsible for the maritime demesne, and with efficient legislation, it is possible to achieve sustainable development of submarine cable infrastructure.\u0000The paper provides an overview of the legal aspects of submarine optical cable infrastructure design and application at the national and international levels. Special attention is dedicated to the analysis of a national legal regime regulating the protection and sustainable use of submarine cables. Thus, the authors will provide critical analysis of a kind of dualism present in the application of the Ordinance on the Register of Concessions and the Ordinance on the Register of Concessions on the Maritime Demesne and offer suggestions for potential improvements of a national legal framework pertaining to the right of laying and legally protecting submarine cables.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48235443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For all design phases of naval vessels, the fidelity of seakeeping calculations in extreme seas is open to discussion due to the inadequacy of the linear theory of ship motions. Currently the computer-generated time series of ship responses and wave height (the real time computer experiments) are utilized to calculate the distribution of the vertical distortion, shear force and bending moment by means of “ship hydroelasticity theory”. Inspired by these studies a simulation based calculation of symmetric ship motions is performed in long crested irregular head seas, in addition with a body-exact strip theory approach. The scope of this study is limited to the ship motions only. Verification is achieved utilizing the spectral analysis procedure which contains the discrete Fourier transform (DFT) and the smoothing algorithms. The results are compared with the experimental data, and the ANSYS AQWA software results. The simulation results provide adequate data for the extreme responses. This state-of-the-art method in addition with a “body-exact strip theory approach” ensures the consistent assessment of the seakeeping performance in extreme sea condition. As a result, it is evaluated that this calculation method can be used in the design stages of naval platforms.
{"title":"Simulation based calculation of ship motions in extreme seas with a body-exact strip theory approach","authors":"K. Anil, D. B. Danişman, K. Sariöz","doi":"10.31217/p.35.1.5","DOIUrl":"https://doi.org/10.31217/p.35.1.5","url":null,"abstract":"For all design phases of naval vessels, the fidelity of seakeeping calculations in extreme seas is open to discussion due to the inadequacy of the linear theory of ship motions. Currently the computer-generated time series of ship responses and wave height (the real time computer experiments) are utilized to calculate the distribution of the vertical distortion, shear force and bending moment by means of “ship hydroelasticity theory”. Inspired by these studies a simulation based calculation of symmetric ship motions is performed in long crested irregular head seas, in addition with a body-exact strip theory approach. The scope of this study is limited to the ship motions only. Verification is achieved utilizing the spectral analysis procedure which contains the discrete Fourier transform (DFT) and the smoothing algorithms. The results are compared with the experimental data, and the ANSYS AQWA software results. The simulation results provide adequate data for the extreme responses. This state-of-the-art method in addition with a “body-exact strip theory approach” ensures the consistent assessment of the seakeeping performance in extreme sea condition. As a result, it is evaluated that this calculation method can be used in the design stages of naval platforms.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46362065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Existing and future IMO restrictions on emission of harmful substances contained in exhaust gas have introduced an obligation to implement technical solutions to reduce NOX, SOX and CO2 emissions. Reduction in NOX and SOX emissions has been achieved by systems (i.e. SCR and EGR) ensuring Tier III-compliant exhaust gas composition. SCR and EGR systems have also affected the amount of exhaust gas waste heat. Therefore reduction in CO2 emissions has mostly been dependent on available amount of exhaust gas waste heat to produce electricity using waste heat recovery generator unit instead of medium-speed diesel generating set. Comparative analysis of amounts of exhaust gas waste heat in LNG and MGO modes under ISO ambient conditions has been carried out with particular emphasis on the impact of different variants of SCR and EGR systems. Formulae to estimate the amounts of exhaust gas waste heat have been determined using least squares method.
{"title":"Comparative analysis and estimation of amounts of exhaust gas waste heat from the Tier III-compliant dual-fuel low-speed marine main engines","authors":"P. Korlak","doi":"10.31217/p.35.1.14","DOIUrl":"https://doi.org/10.31217/p.35.1.14","url":null,"abstract":"Existing and future IMO restrictions on emission of harmful substances contained in exhaust gas have introduced an obligation to implement technical solutions to reduce NOX, SOX and CO2 emissions. Reduction in NOX and SOX emissions has been achieved by systems (i.e. SCR and EGR) ensuring Tier III-compliant exhaust gas composition. SCR and EGR systems have also affected the amount of exhaust gas waste heat. Therefore reduction in CO2 emissions has mostly been dependent on available amount of exhaust gas waste heat to produce electricity using waste heat recovery generator unit instead of medium-speed diesel generating set. Comparative analysis of amounts of exhaust gas waste heat in LNG and MGO modes under ISO ambient conditions has been carried out with particular emphasis on the impact of different variants of SCR and EGR systems. Formulae to estimate the amounts of exhaust gas waste heat have been determined using least squares method.","PeriodicalId":44047,"journal":{"name":"Pomorstvo-Scientific Journal of Maritime Research","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49561187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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