Temat: energy conversion - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Technical and legal determinants of energy conversion in electric vehicle equipped with energy recovery system
Autorzy:: Juda, Z.
Tematy:: transport
regenerative braking
energy conversion; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247926.pdf Link otwiera się w nowym oknie
Opis:: Regenerative braking in electric or hybrid driven vehicles is now commonly used feature. Development of technologies of electrical machines, secondary energy sources, power electronics and control systems allows for more efficient using of this attribute. Regenerative braking system converts the kinetic energy of moving vehicles on this form of energy that you can store in a secondary source of energy. The most common form of energy after conversion is electricity, easy to store in batteries or supercapacitors. There also are known systems with storage of mechanical energy (high-speed flywheels with composite rotors). Drive systems with optional regenerative braking should take into account a number of aspects influencing the process. It is very important to maintain the stability of the vehicle movement during braking. Another important aspect is the cooperation of regenerative braking system with conventional, mechanical brake system of the vehicle driven by a single axis. Sizing of the electrical machine (or machines) is associated with the needs of the propulsion of the vehicle, which limits the amount of absorbed energy in the initial stage of braking. Individual elements of the system energy conversion efficiency chain complexity affect the energetic results of this process. On the energy, efficiency of the process of braking energy recovery affects string conversion efficiency in the individual components of the system. Regenerative braking is the important factor, which could improve electric vehicle market chances, particularly in the city or neighbourhood personal transport. The article contains a description of the technical and legal circumstances of the process of regenerative braking and energy aspects of this process.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Recent advances on surface mounted metal-organic frameworks for energy storage and conversion applications: Trends, challenges, and opportunities
Autorzy:: Dubey, Prashant
Nogala, Wojciech
Shrivastav, Vishal
Mansi
Shrivastav, Vaishali
Sundriyal, Shashank
Deep, Akash
Gupta, Bhavana
Wydawca:: Elsevier
Cytata wydawnicza:: Shrivastav, V., Mansi, Gupta, B., Dubey, P., Deep, A., Nogala, W., Shrivastav, V., & Sundriyal, S. (2023). Recent advances on surface mounted metal-organic frameworks for energy storage and conversion applications: Trends, challenges, and opportunities. In Advances in Colloid and Interface Science (Vol. 318, p. 102967). Elsevier BV. https://doi.org/10.1016/j.cis.2023.102967
Opis:: Establishing green and reliable energy resources is very important to counteract the carbon footprints and negative impact of non-renewable energy resources. Metal-organic frameworks (MOFs) are a class of porous material finding numerous applications due to their exceptional qualities, such as high surface area, low density, superior structural flexibility, and stability. Recently, increased attention has been paid to surface mounted MOFs (SURMOFs), which is nothing but thin film of MOF, as a new category in nanotechnology having unique properties compared to bulk MOFs. With the advancement of material growth and synthesis technologies, the fine tunability of film thickness, consistency, size, and geometry with a wide range of MOF complexes is possible. In this review, we recapitulate various synthesis approaches of SURMOFs including epitaxial synthesis approach, direct solvothermal method, Langmuir-Blodgett LBL deposition, Inkjet printing technique and others and then correlated the synthesis-structure-property relationship in terms of energy storage and conversion applications. Further the critical assessment and current problems of SURMOFs have been briefly discussed to explore the future opportunities in SURMOFs for energy storage and conversion applications.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 3.

Tytuł:: Solar Energy Conversion Methods
Autorzy:: SOBCZYK, WIKTORIA
NAGORNIUK, OKSANA
RIABUSHENKO, OLGA
WLIZŁO, JAKUB
Tematy:: solar energy conversion
energy policy
education; Pokaż więcej
Wydawca:: Uniwersytet Rzeszowski
Powiązania:: https://bibliotekanauki.pl/articles/455475.pdf Link otwiera się w nowym oknie
Opis:: This article presents the characteristics of three basic methods of solar energy conversion: thermal energy – photothermal conversion, electrical energy – photovoltaic conversion, energy related to chemical processes – photochemical conversion. The paper addresses some aspects of the primary goals of EU climate and energy policy, as well as the benefits of passive building constructions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Wind power plants : types, design and operation principles
Autorzy:: Tywoniuk, A.
Skorupka, Z.
Tematy:: wind energy
wind power plants
energy conversion
renewable energy; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244681.pdf Link otwiera się w nowym oknie
Opis:: Many countries worldwide support green energy production on large scale mostly by solar or wind energy subsidizing manufacture and operation of such systems. During the last two decades, there has been significant increase in wind energy production globally. Statistics show continuously growing investments in the development and installation of wind turbines and farms. Currently, wind energy is the second most important source of renewable energy after water energy. By 2016 global cumulative installed wind capacity surpassed 432 k MW [GWEC]. In last several years, most dynamic growth in wind power generation investments was recorded in Asia. Europe, in comparison, has less impressive but steady growth in wind power plants through the years. In this article, authors present global demand on energy in comparison to efficiency of wind power plants in relation to the local and global location as well as to the scale of installed system. Authors also present statistical data concerning wind power plants development. General classification, using number of criteria (ex. power output, construction size, rotor axis orientation and other) of wind to electric power converting devices is presented. Various types of devices, which authors describe in this article, can perform conversion of wind blow energy to the electric energy using different yet similar methods.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Simulation Analysis of Fuel Mixture Influence on the Effects of Operation of Selected Steam Boilers in Municipal Districts
Autorzy:: Wójcicka-Migasiuk, Dorota
Paśnikowska-Łukaszuk, Magdalena
Tematy:: steam boilers
renewable energy sources
energy conversion
fossil fuels; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/124239.pdf Link otwiera się w nowym oknie
Opis:: The paper describes a system of steam boilers with the main attention drawn to the selected aspects of their operations in municipal district heating. The presented fuel characteristics show the characteristic factors in the described processes. The analysis reflects the simulations of fuel mixtures and their results in relation to the energy conversion processes in environmental aspects. Some considerations underline the results that have influence on the decisions pertaining to mixture composition. The paper presents comparative graphs and results in absolute terms. The conclusions are formulated taking into account the environmental effects, in particular localization of system elements and addresses the possible solution options to improve fuel mixtures and develop system efficiency.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Modelowanie i komputerowa symulacja wybranych typów ogniw fotowoltaicznych
Modelling and numerical symulation selecter types of PV cells
Autorzy:: Heim, D.
Krawczyński, S.
Tematy:: konwersja energii
ogniwa fotowoltaiczne
energy conversion
photovoltaic cells; Pokaż więcej
Wydawca:: Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Powiązania:: https://bibliotekanauki.pl/articles/1395686.pdf Link otwiera się w nowym oknie
Opis:: W pracy omówiono podstawowe zagadnienia dotyczące modelowania sprzężonych procesów pochłaniania i konwersji energii promieniowania słonecznego na energię cieplną i elektryczną. W przedstawionych modelach zdefmiowanych dla trzech typów ogniw fotowoltaicznych uwzględniono zarówno parametry optyczno-geometryczne modułu jak i charakterystyki prądowo-napięciowe ogniwa. Symulacje komputerowe wykonano przy pomocy programu ESP-r dla dwóch wybranych okresów Typowego Roku Meteorologicznego; tygodnia lata i zimy odpowiednio o największej i najmniejszej ilości promieniowania słonecznego. Dodatkowo dla potrzeb analiz energetycznych symulacje przeprowadzono dla pełnego roku kalendarzowego. W obliczeniach uwzględniono zarówno zmianę promieniowania bezpośredniego i rozproszonego jak i zmianę temperatury otoczenia wpływającej bezpośrednio na wydajność ogniw fotowoltaicznych.
The proper designing of PV systems requires the use of suitable equipment for building energy simulation. It enables to design the best position of the PV array, as well as the right quantity of produced energy in different cases. Modelling building integrated photovoltaic (PV) in building energy simulation are complex and required advanced numerical techniques. The PV responds to many environmental influences like: irradiance level, its spectral distribution, temperature and electrical characterisation of PV modules. Modelling of three single PV array in ESP-r is presented in t his paper. Computer simulations have been carried out with the use of TMY data for Warsaw, taking into consideration direct and diffuse solar radiation and temperature. The amount of energy produced by PV array during the whole year, as well as the change ofpower output within selected summer and winter weeks, have been calculated.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Utilising water wave energy – technology profile
Autorzy:: Chybowski, L.
Kuźniewski, B.
Tematy:: wave energy
energy conversion
shore protection
mechanical motor
active damper; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/135591.pdf Link otwiera się w nowym oknie
Opis:: The use of wave energy was studied at the Maritime University of Szczecin. The two main subjects were wave-energy conversion and using wave energy to protect the seashore against the hazardous effects of extreme waves. A construction of new technologies were outlined. Future research and intended cooperation were presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Energy – conversion, conservation and management
Autorzy:: Badur, J.
Tematy:: internal
kinetic and potential energy
energy fluxes
energy conservation
energy conversion; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/175468.pdf Link otwiera się w nowym oknie
Opis:: Energy is an abstract notion that helps to understand the nature and contributes to the creation of the civilization. The energy notion has a huge meaning not only due to practical reason – it is essential for economy and philosophy too. It turns out that in Hellenic philosophy, and especially in its fundamental part, i.e., metaphysics, there is no place for the concepts and methods of reasoning developed by physics and chemistry. Philosophy assumes that most of the physical and chemical concepts are not known in nature in spe these are employed by science only as a kind of mental keys (qualitative occultea) for the description and understanding of the universe. The concept of energy is only one example of a notion accepted both by the philosophers (in its metaphysical sense) and physicians (in its descriptive role).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Badanie sprawności układu maszyna PMSM – przekształtnik w szerokim zakresie przetwarzanej mocy
Investigation of efficiency of PMSM – inverter system in wide range of processed power
Autorzy:: Baszyński, M.
Dudek, R.
Dziadecki, A.
Stobecki, A.
Tematy:: maszyna PMSM
sprawność przetwarzania energii
PMSM
energy conversion efficiency; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Powiązania:: https://bibliotekanauki.pl/articles/1199452.pdf Link otwiera się w nowym oknie
Opis:: The paper shows the results of investigation of power processing efficiency and power losses in PMSM – inverter system, in wide range of processed power. The laboratory system tested consists of the Permanent Magnet Synchronous Generator and four-quadrant inverter, transferring the energy produced directly to the main supply. The generator was driven by the induction motor drive system, supplied from the inverter stabilising the torque of the motor. The rotational speed was stabilised by the PMSM drive system. The investigations has been made for the rotational speed in the range 100 to 1000 rpm and the torque between 10 and 100 percent of maximum value. The results are presented on plots showing the power losses and efficiency of energy processing in each part of power processing system as a function of torque, for various values of rotational speed.
W artykule przedstawiono wyniki badania mocy strat i sprawności przetwarzania energii w układzie laboratoryjnym, złożonym z maszyny synchronicznej o magnesach trwałych (PMSM), o mocy 14,6 kW, pracującej jako generator i czterokwadrantowego przekształtnika, oddającego energię do sieci elektroenergetycznej. Generator był napędzany układem złożonym z maszyny indukcyjnej i czterokwadrantowego przekształtnika. Układ napędzający pracował w reżimie zadanego momentu, zaś układ z maszyną PMSM stabilizował zadaną prędkość obrotową. Badania przeprowadzono dla prędkości obrotowych wału zmienianych w zakresie od 100 obr/min do 1000 obr/min oraz momentu na wale zmienianego w zakresie ok. 10 - 100% Tmax. Uzyskane wyniki pokazano na wykresach, ilustrujących moc strat i sprawność przetwarzania energii w poszczególnych elementach toru przetwarzania w funkcji momentu na wale, dla różnych prędkości obrotowych wału. Otrzymane rezultaty pozwalają lepiej określić sprawność elektrowni wiatrowej, która z istoty swojej przez znaczną część czasu pracuje przy relatywnie małych wartościach przetwarzanej mocy.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: W-doped $BiVO_4$ photoanodes for light-to-chemical energy conversion
Autorzy:: Juodkazyte, Jurga
Macyk, Wojciech
Savickaja, Irena
Petruleviciene, Milda
Ramanavicius, Arunas
Kuncewicz, Joanna
Stochel, Grażyna
Spilarewicz, Kaja
Opis:: Renewable energy and related systems are an indispensable part of our future. The urgent need to tackle climate change and the energy crisis has driven the search for innovative alternative technologies to replace current polluting and energy-intensive ones. Photoelectrochemical (PEC) advanced oxidation systems offer the possibility to convert light energy into chemical energy and store it in the form of valuable chemical compounds, e.g., oxidants and hydrogen. In this study, the performance of sol–gel-derived W-doped BiVO4 in photoelectrolysis of aqueous sulfate solutions was investigated. W-doping was found to have a significant impact on the PEC activity of the material, with optimal results achieved using 1–5 atom % of the dopant. Fluorescence lifetime imaging microscopy revealed variations in material quality, which were attributed to the defects in the BiVO4 crystal lattice introduced by W-doping. The double maxima observed in the incident photon-to-current efficiency maps and applied-bias photon-to-current efficiency plots were explained by the dopant-related introduction of electronic states, which require lower energy input for their excitation and participation in the interfacial charge transfer reactions. Analysis of the charge separation efficiencies in the bulk and on the surface of the layers revealed that separation in the bulk is the limiting factor for all the studied materials, whereas W-doping reduces the charge carrier recombination at the photoelectrode surface. The latter effect was ascribed to the superficial position of BiVO4 lattice defects introduced by W-doping. Light-driven generation of persulfate and hydrogen was demonstrated.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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