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    Wyświetlanie 1-5 z 5
    Tytuł:
    An analysis of solar energy conversion systems based on photon and thermal processes
    Autorzy:
    Fieducik, J.
    Godlewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/184520.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    energy conversion
    photoelectric effect
    thermoelectric process
    thermionic emission process
    Opis:
    Solar spectral irradiance covers a fairly broad wavelength range. Solar radiation is part of the electromagnetic spectrum which is described by the concept of wave-particle duality. The corpuscular theory of electromagnetic radiation states that energy is transmitted by photons. Photons carry specific amounts of energy which can be used to convert solar energy into other types of energy, in particular electricity. The internal photoelectric effect is important for the conversion of solar energy to electricity because the efficiency of the external photoelectric effect is too low. Every quantum of solar energy also carries a certain amount of energy which can be converted into heat energy. The objective of the paper is to analyze and compare the efficiency of solar energy conversion in photon and thermal processes, to review the technological advances made in this field, and to indicate potential directions for the development of systems converting solar energy to electricity.
    Źródło:
    Geology, Geophysics and Environment; 2016, 42, 4; 403-409
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal degradation of waste polyolefines and their application in blast-furnace process
    Termiczna degradacja odpadowych poliolefin i ich zastosowanie w procesie wielkopiecowym
    Autorzy:
    Kuźnia, M.
    Magdziarz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/264092.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    wielki piec
    współspalanie
    analiza termiczna
    odpady poliolefinowe
    blast furnace
    co-combustion
    thermal analysis
    waste polyolefines
    Opis:
    Nowadays about 60% of world production and consumption of plastics are polyolefines. They are used as packaging, in building engineering, automotive industry or electronic engineering. High calorific value and proper Chemical composition of polyolefines (based on carbon and hydrogen) make them ideal for use in a wide range of applications. The polyolefines can be used as a substitute for coke in blast-furnace processes. This paper outlines thermal decomposition of PE-LD, PE-HD, PP which are used in agriculture and packaging from household. Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC) were used as analytical methods.
    Obecnie około 60% światowej produkcji i konsumpcji tworzyw sztucznych stanowią poliolefiny. Znajdują one zastosowanie w produkcji opakowań, w budownictwie, w przemyśle samochodowym oraz przemyśle elektronicznym. Wysoka wartość opałowa oraz skład chemiczny poliolefin (oparty na węglu i wodorze) sprawiają, że po wykorzystaniu mogą być stosowane w szerokim zakresie. Poliolefiny mogą być stosowane m.in. jako substytut koksu w procesie wielkopiecowym. Artykuł przedstawia rozkład termiczny PE-LD, PE-HD oraz PP pochodzących z rolnictwa, opakowalnictwa i z gospodarstwa domowego. Jako metody analityczne zastosowano: termograwimetrię (TG) i różnicową kalorymetrię skaningową (DSC).
    Źródło:
    Metallurgy and Foundry Engineering; 2006, 32, 2; 117-123
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Importance of TDA Thermal Analysis in an Automated Metallurgical Process
    Autorzy:
    Petrus, Łukasz
    Bulanowski, Andrzej
    Kołakowski, Jakub
    Sobieraj, Jakub
    Paruch, Tomasz
    Urbanowicz, Mariusz
    Brzeżański, Mateusz
    Burdzy, Daniel
    Zych, Jerzy
    Janerka, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2056035.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    ductile iron
    grey cast iron
    thermal derivative analysis
    melting automation
    modification
    żeliwo sferoidalne
    żeliwo szare
    termiczna analiza pochodnych
    automatyzacja topienia
    modyfikacja
    Opis:
    The article presents the results of research and work related to the implementation of the research and development project POIR.01.01.01-00-0120/17 co-financed by the EU, through the NCBR, entitled: Innovative technology using thermal analysis, TDA, of self-feeding manufacturing of high-quality cast iron to produce new generation, enhanced performance casts. In many foundries, thermal derivative analysis (TDA) is used in addition to chemical analysis to evaluate the physical and chemical properties of an alloy while it is still in the melting furnace or ladle and before it is poured into the mold. This fact makes it possible to improve the metallurgical quality of the alloy by introducing alloying additives, carburizers or modifiers into the furnace as part of the pre-modification or primary or secondary modification in the ladle or when pouring into molds. Foundry machinery (modifier dosing systems and spheroidizing station) is very important in these operations. Only the full synergy of modern equipment with modern technology ensures high quality and repeatability of the casting process. The article mainly discusses the obtained parameters of TDA analysis (with the use of the ITACA system) at different stages of melting and how to improve them by using modern and fully automated dosing systems (Itaca OptiDose, ItacaWire and ItacaStream). Special attention was paid to the minimum temperature of the eutectoid. The change of its value after the modification process, its influence on the quality of the melted metal, a very strong correlation with the number of nuclei and the number of graphite precipitations in the casts were shown.
    Źródło:
    Journal of Casting & Materials Engineering; 2021, 5, 4; 89--93
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical and thermal analysis for the copper removal process in an electric furnace
    Autorzy:
    Zybała, Radosław
    Golak, Sławomir
    Sak, Tomasz
    Madej, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/29519766.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    numerical modelling
    copper removal
    electric resistance furnace
    contact resistance
    Opis:
    The article presents an electrical model of a resistance furnace with two electrodes encompassing the generation of Joule heat. The characteristic feature of this model was the consideration of contact resistance between the electrodes and the slag. A series of analyses were conducted based on this model. Firstly, the impact of contact resistance on current flow and Joule heat generation in the furnace was assessed, demonstrating its significant importance. A separate group of analyses focused on the spatial configuration of the furnace and its interaction with the aforementioned phenomena. The impact of symmetric and asymmetric electrodes immersion was analysed. In addition to the impact on current flow, the study also demonstrated the influence on the natural convection mechanism described by the proposed measures of the spatial non-uniformity of heat generation. The research showed that symmetric electrode immersion allows for the generation of more heat in the system at a constant voltage. Asymmetric electrodes immersion causes an increase in the non-uniformity of heat generation, which translates into a higher intensity of natural convection.
    Źródło:
    Computer Methods in Materials Science; 2023, 23, 4; 31-44
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Various Matrixes on the Strength Properties of Moulding Sands with Thermally Hardened Hydrated Sodium Silicate for the Ablation Casting Process
    Autorzy:
    Major-Gabryś, Katarzyna
    Puzio, Sabina
    Bryłka, Agata
    Kamińska, Jadwiga
    Powiązania:
    https://bibliotekanauki.pl/articles/2056023.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    innovative foundry technologies and materials
    moulding sand
    ablation casting
    water glass
    thermal curing
    innowacyjne technologie
    materiały odlewnicze
    piasek formierski
    odlewanie ablacyjne
    szkło wodne
    utwardzanie termiczne
    Opis:
    The essence of ablation casting technology consists in pouring castings into single-use moulds made from the mixture of sand and a water-soluble binder. After pouring the mould with liquid metal yet while the casting is still solidifying, the mould destruction (washing out, erosion) takes place using a stream of cooling medium, which in this case is water. This paper focuses on the selection of moulding sands with hydrated sodium silicate for moulds used in ablation casting. The research is based on the use of water glass 145 and 150 as binders. As part of the research, loose moulding mixtures based on two silica sands from different sand mines with different content of binders were prepared. The review of literature data and the results of own studies have shown that moulding sand with hydrated sodium silicate hardened by dehydration is characterized by sufficient strength properties to be used in the ablation casting process. Our own research also confirmed the possibility of using these sand mixtures in terms of both casting surface quality and sand reclamation. The results presented in this paper prove that both sand grains and types of binder tested may be used as components in moulding sands devoted to ablation casting.
    Źródło:
    Journal of Casting & Materials Engineering; 2021, 5, 2; 31--35
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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