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Détails du magazine
Format
Magazine
eISSN
2255-8896
Première publication
18 Mar 2008
Période de publication
6 fois par an
Langues
Anglais

Chercher

Volume 56 (2019): Edition 6 (December 2019)

Détails du magazine
Format
Magazine
eISSN
2255-8896
Première publication
18 Mar 2008
Période de publication
6 fois par an
Langues
Anglais

Chercher

5 Articles
Accès libre

National Energy and Climate Plans: Importance of Synergy

Publié en ligne: 31 Dec 2019
Pages: 3 - 16

Résumé

Abstract

In the modern world, including the European Union, the Baltic States and Latvia, the power industry has a broad definition, area and content, several social life and economic existence, comfort and safety provision. It also covers the following segments: heat/thermal energy, transport/fuel, electricity, energy resources and their types, etc.

More competent and wider synergy among different energy sectors and power industry and other areas provides the option to solve the global problems, for example, the mitigation of climate changes and the provision of energy sustainability by reducing the production of greenhouse gases, increasing the use of renewable energy sources, achieving higher energy efficiency and providing the careful use of energy resources. The results of synergy are of economic importance; they provide the efficiency and competitiveness of costs.

In this paper, the necessity of synergy between renewables and conventional generation and synergy among energy sectors are considered to achieve the dimensions of national energy and climate plans.

Mots clés

  • energy
  • infrastructure
  • national energy and climate plans
  • synergy
Accès libre

Synergy Between the Natural Gas and RES in Enhancement of Security of Energy Supply in the Baltic Countries (Problem Statement)

Publié en ligne: 31 Dec 2019
Pages: 17 - 31

Résumé

Abstract

Although the natural gas and renewable energy sources are two significant elements of the Baltic primary energy mix both today and in foreseeable future, the competitive edge of their usage often prevails over possibilities of mutually beneficial coexistence. Universally both forms of energy are often described as key elements of a transition to a cleaner and more secure energy future (low-carbon economy), but regionally much of the current discourse considers each in isolation or concentrates on the competitive impacts of one on the other. The paper outlines several potential avenues and further research trends of synergies between the natural gas, a proven fast-reacting fossil fuel, and RES as seen from viewpoints of the Baltic energy sector sustainability and security of energy supply.

Mots clés

  • decarbonisation
  • fast-reacting fossil fuels
  • natural gas
  • renewable energy
  • transitional technologies
  • synergy
Accès libre

Economical Valuation of Wave Power Plant in the Baltic Sea Region at Pre-Flexibility Stage

Publié en ligne: 31 Dec 2019
Pages: 32 - 46

Résumé

Abstract

The article deals with free surface gravity waves as one of the alternative energy sources and their use. The potential of the waves and their transformation devices are considered as the main energy use impact factors. The goal of the research is to perform a cost-benefit assessment. The following tasks have been set: to make an assessment of wave potential, to identify the conversion model and turbine, to determine economic criteria taking into account wave and price variability. The article also provides the description of the theoretical valuation of the costs of the mentioned turbine power plant.

Mots clés

  • axial turbine
  • renewable energy
  • wave energy
  • wave length
  • wave power
  • wave power plant
  • wave propelled turbine
Accès libre

Paraffin Permeability of Synthetic Gypsum Binders Modified by Individual Polymers

Publié en ligne: 31 Dec 2019
Pages: 47 - 56

Résumé

Abstract

The paper presents an experimental study of five different gypsum composites taking into account paraffin permeability. The composites consist of synthetic gypsum, paraffin and polymers. The samples were produced from gypsum slurry of mixing ingredients, all in the liquid state. After 7 days of maturing, the condition of the samples was assessed as well as drying time was determined. In the second part, the paraffin tightness of different samples was analysed. The results showed that after three weeks of tests the tightness sample was A4. Other polymers were characterised by lower tightness. The content of polymer had also the effect on the final results, but the direct relation between polymer content and paraffin tightness was not observed.

Mots clés

  • admixture
  • gypsum
  • polymer
  • phase change materials
  • tightness
Accès libre

Ensuring Reliability of Control Data in Engineering Systems

Publié en ligne: 31 Dec 2019
Pages: 57 - 69

Résumé

Abstract

The paper presents the approach of determination of rationality coefficients of control system, inputted uncertainty, control of the process, system errors, and uncertainty. Algorithms for identifying the states of system have been developed on the basis of theorems of identification. They actually implement the theoretical multiplication cross-section and establish that increasing the reliability of information is possible only through the use of redundancy (structural, procedural, and informational). The increase in the reliability of control data with the developed methods ensures significant improvement of the functioning of information systems and facilitates the adoption of more substantiated decision making.

Mots clés

  • control data
  • engineering system
  • reliability
  • theorems of identification
  • uncertainty
5 Articles
Accès libre

National Energy and Climate Plans: Importance of Synergy

Publié en ligne: 31 Dec 2019
Pages: 3 - 16

Résumé

Abstract

In the modern world, including the European Union, the Baltic States and Latvia, the power industry has a broad definition, area and content, several social life and economic existence, comfort and safety provision. It also covers the following segments: heat/thermal energy, transport/fuel, electricity, energy resources and their types, etc.

More competent and wider synergy among different energy sectors and power industry and other areas provides the option to solve the global problems, for example, the mitigation of climate changes and the provision of energy sustainability by reducing the production of greenhouse gases, increasing the use of renewable energy sources, achieving higher energy efficiency and providing the careful use of energy resources. The results of synergy are of economic importance; they provide the efficiency and competitiveness of costs.

In this paper, the necessity of synergy between renewables and conventional generation and synergy among energy sectors are considered to achieve the dimensions of national energy and climate plans.

Mots clés

  • energy
  • infrastructure
  • national energy and climate plans
  • synergy
Accès libre

Synergy Between the Natural Gas and RES in Enhancement of Security of Energy Supply in the Baltic Countries (Problem Statement)

Publié en ligne: 31 Dec 2019
Pages: 17 - 31

Résumé

Abstract

Although the natural gas and renewable energy sources are two significant elements of the Baltic primary energy mix both today and in foreseeable future, the competitive edge of their usage often prevails over possibilities of mutually beneficial coexistence. Universally both forms of energy are often described as key elements of a transition to a cleaner and more secure energy future (low-carbon economy), but regionally much of the current discourse considers each in isolation or concentrates on the competitive impacts of one on the other. The paper outlines several potential avenues and further research trends of synergies between the natural gas, a proven fast-reacting fossil fuel, and RES as seen from viewpoints of the Baltic energy sector sustainability and security of energy supply.

Mots clés

  • decarbonisation
  • fast-reacting fossil fuels
  • natural gas
  • renewable energy
  • transitional technologies
  • synergy
Accès libre

Economical Valuation of Wave Power Plant in the Baltic Sea Region at Pre-Flexibility Stage

Publié en ligne: 31 Dec 2019
Pages: 32 - 46

Résumé

Abstract

The article deals with free surface gravity waves as one of the alternative energy sources and their use. The potential of the waves and their transformation devices are considered as the main energy use impact factors. The goal of the research is to perform a cost-benefit assessment. The following tasks have been set: to make an assessment of wave potential, to identify the conversion model and turbine, to determine economic criteria taking into account wave and price variability. The article also provides the description of the theoretical valuation of the costs of the mentioned turbine power plant.

Mots clés

  • axial turbine
  • renewable energy
  • wave energy
  • wave length
  • wave power
  • wave power plant
  • wave propelled turbine
Accès libre

Paraffin Permeability of Synthetic Gypsum Binders Modified by Individual Polymers

Publié en ligne: 31 Dec 2019
Pages: 47 - 56

Résumé

Abstract

The paper presents an experimental study of five different gypsum composites taking into account paraffin permeability. The composites consist of synthetic gypsum, paraffin and polymers. The samples were produced from gypsum slurry of mixing ingredients, all in the liquid state. After 7 days of maturing, the condition of the samples was assessed as well as drying time was determined. In the second part, the paraffin tightness of different samples was analysed. The results showed that after three weeks of tests the tightness sample was A4. Other polymers were characterised by lower tightness. The content of polymer had also the effect on the final results, but the direct relation between polymer content and paraffin tightness was not observed.

Mots clés

  • admixture
  • gypsum
  • polymer
  • phase change materials
  • tightness
Accès libre

Ensuring Reliability of Control Data in Engineering Systems

Publié en ligne: 31 Dec 2019
Pages: 57 - 69

Résumé

Abstract

The paper presents the approach of determination of rationality coefficients of control system, inputted uncertainty, control of the process, system errors, and uncertainty. Algorithms for identifying the states of system have been developed on the basis of theorems of identification. They actually implement the theoretical multiplication cross-section and establish that increasing the reliability of information is possible only through the use of redundancy (structural, procedural, and informational). The increase in the reliability of control data with the developed methods ensures significant improvement of the functioning of information systems and facilitates the adoption of more substantiated decision making.

Mots clés

  • control data
  • engineering system
  • reliability
  • theorems of identification
  • uncertainty

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