scholarly journals Energy-efficient building with the integrated use of renewable energy sources in severe weather conditions

2015 ◽  
pp. 191-199 ◽  
Author(s):  
V. I. Velkin ◽  
V. V. Vlasov ◽  
S. E. Shcheklein
Keyword(s):  
Renewable Energy ◽  
Energy Efficient ◽  
Renewable Energy Sources ◽  
Weather Conditions ◽  
Severe Weather ◽  
Energy Sources ◽  
Energy Efficient Building

Research on New Technology of Energy Efficient Buildings and Utilization of Renewable Energy Sources

2011 ◽  
Vol 224 ◽  
pp. 104-108
Author(s):  
Ya Guang Sun
Keyword(s):  
Energy Efficiency ◽  
Renewable Energy ◽  
Energy Efficient ◽  
New Technology ◽  
Renewable Energy Sources ◽  
Building Design ◽  
Energy Sources ◽  
Building Technology ◽  
Energy Efficient Buildings ◽  
Energy Efficient Building

Current social development is pressing for energy efficient buildings. The trend of consistent updating of energy-efficient building technology reflects the importance and urgency of energy efficiency in buildings. Through analysis on the current situation of building development, it can be obtained that the energy efficient buildings as well as utilization of renewable energy sources in buildings will be bound to be one of main topics for discussion in future building design.

scholarly journals Investments in Croatian RES Plants and Energy Efficient Building Retrofits: Substitutes or Complements?

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 2
Author(s):  
Davor Mikulić ◽  
Damira Keček
Keyword(s):  
Renewable Energy ◽  
Energy Efficient ◽  
Renewable Energy Sources ◽  
Value Added ◽  
Energy Transition ◽  
Economic Effects ◽  
Energy Sources ◽  
Full Time ◽  
Low Carbon ◽  
Energy Efficient Building

Croatian energy strategy defines ambitious goals aimed at achieving energy transition toward a sustainable low-carbon society. Achieving those goals requires significant investments in the renewable energy sources and improved energy efficiency of buildings. The purpose of this paper is to estimate and compare the economic effects of the energy transition on the renewable energy supply and demand side. The estimation of the energy transition effects in Croatia in the period 2020–2050 is based on the input-output model, which identifies direct, indirect and induced effects of investments in renewable energy sources and energy efficient buildings renovation. Results of the study reveal relatively higher gross value added and employment effects induced by investments in building retrofits, but the effects of investments in renewable energy are also significant. Investments in sustainable, efficient and environmentally effective energy system could significantly contribute to Croatian GDP. While GVA effects range from 0.4% to 0.6% of annual GDP, the share of full-time equivalent jobs induced by energy transition could reach 0.5% to 1% of total employment in Croatia. Investments in RES plants and energy efficient building reconstruction are not substitutes but complements which ensure a smooth energy transition if undertaken together.

scholarly journals A Smart Adaptive Switching Module Architecture Using Fuzzy Logic for an Efficient Integration of Renewable Energy Sources. A Case Study of a RES System Located in Hulubești, Romania

2020 ◽  
Vol 12 (15) ◽  
pp. 6084
Author(s):  
Simona-Vasilica Oprea ◽  
Adela Bâra ◽  
Ștefan Preda ◽  
Osman Bulent Tor
Keyword(s):  
Fuzzy Logic ◽  
Renewable Energy ◽  
Power Systems ◽  
Electricity Generation ◽  
Renewable Energy Sources ◽  
Storage System ◽  
Weather Conditions ◽  
Energy Sources ◽  
Fuzzy Logic Systems

Electricity generation from renewable energy sources (RES) has a common feature, that is, it is fluctuating, available in certain amounts and only for some periods of time. Consuming this electricity when it is available should be a primary goal to enhance operation of the RES-powered generating units which are particularly operating in microgrids. Heavily influenced by weather parameters, RES-powered systems can benefit from implementation of sensors and fuzzy logic systems to dynamically adapt electric loads to the volatility of RES. This study attempts to answer the following question: How to efficiently integrate RES to power systems by means of sustainable energy solutions that involve sensors, fuzzy logic, and categorization of loads? A Smart Adaptive Switching Module (SASM) architecture, which efficiently uses electricity generation of local available RES by gradually switching electric appliances based on weather sensors, power forecast, storage system constraints and other parameters, is proposed. It is demonstrated that, without SASM, the RES generation is supposed to be curtailed in some cases, e.g., when batteries are fully charged, even though the weather conditions are favourable. In such cases, fuzzy rules of SASM securely mitigate curtailment of RES generation by supplying high power non-traditional storage appliances. A numerical case study is performed to demonstrate effectiveness of the proposed SASM architecture for a RES system located in Hulubești (Dâmbovița), Romania.

scholarly journals Concept Design and Performance Evaluation of a Fossil-Free Operated Cargo Ship with Unlimited Range

2020 ◽  
Vol 12 (16) ◽  
pp. 6609 ◽  
Author(s):  
Enric Julià ◽  
Fabian Tillig ◽  
Jonas W. Ringsberg
Keyword(s):  
Renewable Energy ◽  
Energy Production ◽  
Renewable Energy Sources ◽  
Weather Conditions ◽  
Negative Energy ◽  
Performance Model ◽  
Energy Sources ◽  
Concept Design ◽  
Dual Mode ◽  
Photovoltaic Generators

To meet the IMO goals of emissions reduction in shipping, drastic actions must be taken. Wind-assisted propulsion and renewable energy sources are today discussed frequently as realistic alternatives for future ship propulsion and energy production. This study presents a new and innovative concept of a fossil-free operated cargo ship aiming to achieve an unlimited range. The purpose of the study is to present the feasibility but also the limitations of a ship propelled and operated purely on renewable energy harnessed at sea, independent from shore-based energy sources. Aside from Flettner rotors for propulsion, the ship concept incorporates photovoltaic generators, wind turbines, and a dual-mode propeller to produce energy for the auxiliary systems and for the Flettner rotors, as well as batteries to balance the energy production and consumption. The dual-mode propeller can be used for energy generation and propulsion, thus levelling out any speed drops or peaks and thereby ensuring more reliable operation. The whole system is modelled numerically, and full ship voyages are simulated using the ship performance model ShipCLEAN. Results show feasible achieved speeds on a route with realistic weather conditions. However, negative energy balances limit the pure renewable sailing conditions. Further logistic and technical challenges are discussed.

Renewable Energy Sources Used to Supply Pre-School Facilities with Energy in Different Weather Conditions

2014 ◽  
Vol 624 ◽  
pp. 604-612 ◽  
Author(s):  
Rifat Alihodzic ◽  
Vera Murgul ◽  
Nikolay Vatin ◽  
Ekaterina Aronova ◽  
Vojislav Nikolić ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Power Supply ◽  
Solar Power ◽  
Renewable Energy Sources ◽  
Weather Conditions ◽  
School Facilities ◽  
Energy Sources ◽  
Space Planning ◽  
Saint Petersburg ◽  
The City

Pre-school facilities are considered to be specific buildings in the matter of construction and renovation. Space-planning features in design for pre-school facilities create special conditions for solar power use to ensure heat and power supply. The article deals with estimation of incoming solar power in reference to the surfaces oriented in different cardinal directions under the weather conditions of the city of Saint-Petersburg (Russia) and the city of Nish (Serbia). A model of how to ensure power supply for a kindergarten of the city of Nish is presented on the basis of the calculations analysis. The cases with regard to completed projects designed to use renewable energy sources in order to supply pre-school facilities with energy in other weather conditions are given herein.

Comprehensive Thermodynamic Analysis of Steam Storage in a Steam Cycle in a Different Regime of Work: A Zero-Dimensional and Three-Dimensional Approach

2021 ◽  
Vol 144 (5) ◽  
Author(s):  
Paweł Ziółkowski ◽  
Natalia Szewczuk-Krypa ◽  
Anna Butterweck ◽  
Michał Stajnke ◽  
Stanisław Głuch ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Carbon Dioxide Emissions ◽  
Renewable Energy Sources ◽  
Three Dimensional ◽  
Weather Conditions ◽  
Energy System ◽  
Temperature Fields ◽  
Energy Sources ◽  
Accurate Analysis

Abstract Due to the current trends aiming to reduce carbon dioxide emissions by increasing the use of renewable energy sources, changes are required in the operation of coal-fired steam units. The unstable nature of renewable energy sources, depending on weather conditions, means that the amount of energy produced varies and is not always in line with peak demand. To ensure the security and stability of energy supplies in the energy system, renewable sources should cooperate with units independent of environmental conditions. With conventional steam systems, the main issue of such energy storage applied to steam turbine units is presented in this article, which, in the event of a need for a sudden reduction of the system load, prevents overloading of the boiler and turbines, improving the safety of the system. This article presents a thermodynamic model of this energy storage. A zero-dimensional (0D) model was implemented, including the operating parameters of the unit. This model directly relates to the thermodynamic parameters defined at specific points of the thermodynamic cycle. Based on the 0D model, it was shown that the process of loading the energy storage with steam leads to a load reduction of up to 4%. Conversely, when discharging the stored energy, the net power of the steam block may increase by 0.4%. For more detailed analysis, a three-dimensional (3D) nonequilibrium with including cross effects approach was applied. This approach is based on flow models, with phase transitions that determine temperature fields, densities, and phase transition in relevant space, and is used for more accurate analysis. Here, we investigate the relationship between the 0D and 3D approaches in the context of steam storage. The combination of these two approaches is the fundamental novelty of this article.

Electric energy storage units for distributed energy systems

2020 ◽  
Vol 2 (4) ◽  
pp. 219-230
Author(s):  
P. A. Khlyupin
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Energy Efficient ◽  
Renewable Energy Sources ◽  
Electric Energy ◽  
Electric Machines ◽  
Energy Sources ◽  
Storage Unit ◽  
Electric Energy Storage ◽  
Storage Units

Introduction: there is much concern about power supply to small and remote villages and industrial facilities, such as crude oil and gas fields, in the present-day power industry. Systems using renewable energy sources are the most innovative solutions to this problem. The need for electric energy storage units complicates the use of renewable energy sources. Versatile types of storage units, working on different principles, are in use now. Flywheels, working on the principle of mechanical accumulation of energy, are of particular interest.Methods: both traditional and advanced designs of electric energy accumulation systems are analyzed in the article. Recent advancements in machine building, power engineering and structural materials are contributed into structural elements of an electric energy accumulation system.Results and discussion: basic strengths and weaknesses of electric energy storage units were identified in the course of the analysis. The author substantiated the need for new effective electric energy storage units working on the principle of mechanical accumulation of potential and kinetic energy. The conclusion is that advanced engineering solutions, such as flywheels and energy efficient reversible electric machines, can boost the efficiency of electric power storage systems. The solution underlying the design of an energy efficient storage unit is offered to electric power industry players.Conclusion: the storage unit under development has flywheels and energy efficient reversible electric machines. It improves the energy efficiency of both classical power generation systems and those using renewable energy sources.

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