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    Wyświetlanie 1-13 z 13
    Tytuł:
    The solar component in the context of the inhabited areas microclimate regulation
    Solnechnaja sostavljajushhaja v kontekste regulirovanija mikroklimata zhilykh territorijj
    Autorzy:
    Koziatnik, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/77690.pdf
    Data publikacji:
    2015
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    climate
    insolation
    overheating
    solar radiation
    sunlight protection
    functional planning
    environmental factor
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 8
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure formation and properties of overheated steel depending on thermokinetic parameters of crystallization
    Autorzy:
    Kondratyuk, S. Ye.
    Veis, V. I.
    Parkhomchuk, Z. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/367984.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    steel
    overheating
    structure
    crystallization
    cooling rate
    stal
    przegrzewanie
    struktura
    krystalizacja
    szybkość chłodzenia
    Opis:
    Purpose: The aim of the proposed research is to investigate the mutual influence of the temperature of an overheated melt and its cooling rate during crystallization on the formation of the cast structure and mechanical properties of structural steels. Design/methodology/approach: Two structural medium-carbon steels were melted in induction furnace and poured from temperatures 1520-1670°C into casting moulds with different heat removal ability. This ensured the crystallization and structure formation of the studied steel castings at cooling rates (Vc) of 5°C/sec (sand-clay mould), 45°C/sec (steel mould), 350°C/sec (water cooled copper mould). It was studied a change of structure formation, mechanical characteristics depending on the temperature-kinetic conditions of the processing of the melt. Based on the processing of the array of obtained experimental data using linear regression analysis and a software package, interpolation models and their graphic images obtained allow a quantitative assessment of the established patterns of structural characteristics and mechanical properties of the studied steels depending on melt temperature (T, °C) and its cooling rate (Vc, °C/sec) during crystallization and structure formation. Findings: Among the technological factors that determine the formation of the cast structure and the mechanical properties of steels, the dominant role is played by the intensity of heat removal during the solidification of castings. The high cooling rate of the melt during crystallization determines an increase in the number of crystallization nuclei due to an increase in the degree of supercooling of the melt, eliminates the negative effect of the high overheating temperature of the metal before casting. Research limitations/implications: In the future, the results can be complemented by studies of the influence of the duration of isothermal exposure of the melt at different temperatures of superheating and cooling conditions. Practical implications: The obtained mathematical models (regression equations) that determine the mutual influence of the cooling rate and the temperature of the melt overheating on the structure and mechanical properties of the studied steels make it possible to obtain steel castings with predetermined properties at the level of properties of wrought steel of similar chemical composition. Originality/value: Interpolation models that allow a quantitative assessment of the established patterns of structural characteristics and mechanical properties of the studied steels depending on the melt temperature (T, °C) and its cooling rate (Vc, °C/sec) during crystallization and structure formation are obtained.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2019, 97, 2; 49-56
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermographic Research of Photovoltaic System Operating in Shaded Conditions
    Autorzy:
    Bożek, E.
    Basista, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/114460.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    photovoltaic systems
    polycrystalline cells
    shaded photovoltaics
    overheating of PV cells
    thermovision in photovoltaics
    Opis:
    Results of infrared research conducted on a photovoltaic system which works in an on-grid mode for over a year are presented in the article. The installation described is regularly shadowed by a cooling system. Thermograms of photovoltaic modules in strong and light shadow were conducted. These images show that even in very weak shadow the PV cells are overheated. This has led to small point damages in the amorphous panels and in the future it may also lead to the destruction of polycrystalline modules.
    Źródło:
    Measurement Automation Monitoring; 2015, 61, 6; 253-256
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deposit attack in tubes of power plant steam boilers
    Zniszczenia podosadowe rur energetycznych kotłów parowych
    Autorzy:
    Balitskii, A.
    Ripey, I.
    Chmiel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/257974.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    kocioł parowy
    rura
    korozja podosadowa
    przegrzanie
    mikrostruktura
    steam boiler
    tubes
    deposit attack
    overheating
    structure
    Opis:
    This article presents the results of the inspection of damaged tubes of steam boilers, the damage being a result of deposit attack. Changes in the chemical composition of feedwater, i.e. its hardness increased due to leaks in brass tubes of the turbine condenser, result in the formation of scale on the tube material, followed by corrosion, overheating and numerous defects. Only during one of the necessary stops, damage of varying degree to over 20 tubes was detected, from a pit (or crack initiation) to fractures of a few tubes. The results of visual inspection and mechanical and metallographic tests of the damaged tubes are given.
    W pracy przedstawiono wyniki badań uszkodzeń rur kotłów parowych, interpretowanych jako wynik procesów korozji podosadowej. Jako główne przyczyny uszkodzeń wskazuje się obecność w wodzie kotłowej związków żelaza (III) oraz związków miedzi (pochodzących z układu skraplacza turbiny), których osady stanowią obszary katodowe, stymulujące rozwój wżerów stanowiących anody. Przedstawiono wyniki inspekcji wizualnej rur, badań właściwości mechanicznych, badań mikrostruktury oraz analiz chemicznych.
    Źródło:
    Problemy Eksploatacji; 2010, 4; 79-89
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aircraft brake temperature from a safety point of view
    Autorzy:
    Piľa, J.
    Korba, P.
    Hovanec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/196528.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    brake
    temperature
    overheating
    aircraft safety
    brake cooling
    hamulec
    temperatura
    przegrzanie
    bezpieczeństwo samolotów
    chłodzenie hamulców
    Opis:
    Safety is critical throughout all stages of aircraft operation, from air mission to ground operation. One of the most important airframe systems that influences the efficacy of ground safety is a wheel brake system. Aircraft ground speed deceleration requires the dissipation of kinetic energy, which depends on aircraft weight and speed. Significant levels of aircraft kinetic energy must be dissipated in the form of heat energy. The brakes of heavy aircraft are especially prone to overheating during landing and taxiing on the ground. The aim of this paper is to focus on the dangers caused by aircraft brakes when overheating and ways in which to eliminate brake overheating problems from a safety perspective.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2017, 94; 175-186
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Telematics based concept focused to avoid engine and vehicle trouble due to overheating
    Autorzy:
    Szpytko, J.
    Udoji, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/393539.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    transport telematics
    transport device availability
    overheating
    temperature sensor
    telematyka transportu
    dostępność urządzenia transportowego
    przegrzanie
    czujnik temperatury
    Opis:
    Overheating of vehicles is gradually becoming a common problem especially in tropical areas and during tropical seasons in the world. Although there are so many factors can cause overheating, hot weather is the most common cause of overheating. Coolants and thermostats in the radiator are no longer sufficient anymore. Traditional solutions preventing an engine from becoming overheated are: coolant levels must be maintained and without leaks; the oil level and viscosity must have the required properties; accepted technical conditions of radiator hoses and the radiator fan; the engine temperature must be acceptable. Modern cars are equipped with the systems supporting the operation process. The aim of this article is the concept of a solution that uses telematics to minimize engine failures due to overheating and to increase the operational readiness of transport means.
    Źródło:
    Archives of Transport System Telematics; 2019, 12, 4; 31-35
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Overheating Degree on Activation Efficiency of Water-glass Containing Sandmix Hardened by Traditional Drying
    Autorzy:
    Stachowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380929.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry engineering
    moulding sand
    overheating degree
    reclaimed binder
    odlewnictwo
    masa formierska
    stopień przegrzania
    spoiwo regenerowane
    Opis:
    Presented are results of a preliminary research on the possibility to use innovative operations of activating inorganic binders during a reclamation process of used sandmixes containing water-glass, hardened by traditional drying. The moulding sand to be examined was prepared of high-silica sand and the selected water-glass grade 145. Next, it was subject to mixing components, compacting, hardening by traditional drying at 100°C, thermal loading of the mould up to 800°C, cooling-down to ambient temperature, knocking-out, various kinds of mechanical dry and wet reclamation to restore bonding properties to the sandmix. For examinations, two ranges of overheating the mould were selected, determined on the grounds of final strength (Rctk) of the sandmixes. It was found, among others, that overheating and dedusting affect activation of a used sandmix. There is a possibility of partial restoring binding properties of the binder by its rehydration in used-up and properly processed moulding sand, provided that hardening was performed by a physical method.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2 spec.; 77-82
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research the stability of refrigerant overhating
    Autorzy:
    Śniegowski, Sebastian
    Gaszek, Krzysztof
    Burlaga, Zuzanna
    Powiązania:
    https://bibliotekanauki.pl/articles/24201293.pdf
    Data publikacji:
    2023
    Wydawca:
    Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
    Tematy:
    refrigeration
    expansion valve
    refrigerant
    overheating the refrigerant
    chłodnictwo
    zawór rozprężny
    czynnik chłodniczy
    przegrzanie czynnika chłodniczego
    Opis:
    The article consists of two parts. The first of them presents an overview drossel elements used in cooling devices. The second part of the article is focuses on the study of the stability of the superheat of the factor. Two expansion valves were compared, the thermostatic one and the electronic one. For this purpose, advanced measuring devices with the possibility of mobile system control were used in the research.
    Źródło:
    Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2023, 2; 7--16
    2450-1859
    2450-8721
    Pojawia się w:
    Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural ventilation and energy efficiency in non-domestic buildings
    Autorzy:
    Pieczara, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/101474.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    natural ventilation
    adaptive thermal comfort
    energy efficiency
    air quality
    passive cooling
    risk of overheating
    thermal mass
    Opis:
    Over the past 50 years the use of air conditioning in non-domestic buildings has become a norm and an indicator of status. Today the rediscovering of the natural ventilation is a part of rediscovering the buildings’ energy efficiency, or maybe even a part of a wider approach, which is a desire to be closer to nature. The main task of all ventilation systems is to maintain an appropriate indoor air quality and to improve the indoor environment. Natural ventilation systems could do the above using less energy than mechanical systems. However, it requires also the implementation of other passive measures. The most important of them are: the reduction of the harmful air contaminants, the control of heat gains, the exposition of the building’s thermal mass and utilisation of the night cooling. Because of energy efficiency and thermal comfort reasons, in temperate climate ventilation systems have to work according to at least three scenarios: spring/autumn, winter and summer. The thermal comfort parameters in naturally ventilated buildings are usually more variable than in air-conditioned ones, what does not mean that the occupants will experience thermal discomfort. Therefore, thermal comfort in passively ventilated buildings should be evaluated according to the adaptive comfort standard, appropriated for the naturally ventilated buildings. The natural ventilation has its limits and probably not all buildings can be ventilated naturally. From the energy efficiency and thermal comfort reasons, implementing the mixed mode systems is sometimes more feasible. However, the real reason why the full potential of natural ventilation could not be explored is very often the lack of confidence in relying exclusively on it.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2017, III/1; 935-947
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallization of AlSi17Cu5Mg Alloy after Time-thermal Treatment
    Autorzy:
    Piątkowski, J.
    Kamiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382327.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hypereutectic Al-Si alloy
    overheating
    thermal analysis
    crystallization process
    stop nadeutektyczny Al-Si
    przegrzanie
    analiza termiczna
    proces krystalizacji
    Opis:
    In the dissertation it has been shown, that so called “time-thermal treatment” (TTT) of the alloy in liquid state as overheating the metal with around 250°C above Tliq. and detailing it in temperature for 30 to 40 minutes has the influence on changing the crystallization parameters (Tliq., TEmin., TEmax., TE(Me), TSol.). It was ascertained, that overheating the AlSi17Cu5Mg alloy substantially above Tliq. results with microcrystalline structure. Evenly distributed in the eutectic warp primeval silicon crystals and supersaturated with alloying additives of base content (Cu, Mg, Fe) of α(Al) solution, ensures not only increase durability in ambient temperature, but also at elevated temperature (250°C), what due to it’s use in car industry is an advantage.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 83-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Mechanical Properties of AlSiCuMg Alloy after Thermo Processing
    Autorzy:
    Piątkowski, J.
    Kamiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/379577.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hypereutectic Al-Si alloy
    overheating
    CuP10 master alloy
    mechanical properties
    microstructure
    stop nadeutektyczny Al-Si
    przegrzanie
    stop CuP10
    właściwości mechaniczne
    Opis:
    In the dissertation it has been shown, that so called „time-thermal treatment” (TTT) of the alloy in liquid state, as overheating the metal with around 250°C above the Tliq. and detaining it in this temperature for around 30 minutes, improves the mechanical properties (HB, Rm, R0,2). It was ascertained, that overheating the AlSi17Cu5Mg alloy aids the modification, resulting with microcrystalline structure. Uniform arrangement of the Si primeval crystals in the warp, and α(Al) solution type, supersaturated with alloying elements present in the base content (Cu, Mg) assures not only increased durability in the ambient temperature, but also at elevated temperature (250°C), what is an advantage, especially due to the use in car industry.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 79-82
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The mechanical properties of AlSi17Cu5 cast alloy after overheating and modification of CuP master alloy
    Autorzy:
    Piątkowski, J.
    Jabłońska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380532.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hypereutectic Al-Si alloy
    overheating
    modification
    CuP10 master alloy
    mechanical properties
    plastic properties
    stop nadeutektyczny Al-Si
    przegrzanie
    modyfikacja
    zaprawa CuP10
    właściwości mechaniczne
    właściwości plastyczne
    Opis:
    The paper presents the results of studies on the effect of the AlSi17Cu5 alloy overheating to a temperature of 920°C and modification with phosphorus (CuP10) on the resulting mechanical (HB, Rm, R0.2) and plastic (A5 and Z) properties. It has been shown that, so-called, "time-thermal treatment" (TTT) of an alloy in the liquid state, consisting in overheating the metal to about 250°C above Tliq., holding at this temperature by 30 minutes improves the mechanical properties. It has also been found that overheating of alloy above Tliq. enhances the process of modification, resulting in the formation of fine-grain structure. The primary silicon crystals uniformly distributed in the eutectic and characteristics of the \alfa(Al) solution supersaturated with alloying elements present in the starting alloy composition (Cu, Fe) provide not only an increase of strength at ambient temperature but also at elevated temperature (250°C).
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 68-71
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Selected Melting Parameters on the Physical and Chemical Properties of Cast Iron
    Autorzy:
    Petrus, Ł.
    Bulanowski, A.
    Kołakowski, J.
    Brzeżański, M.
    Urbanowicz, M.
    Sobieraj, J.
    Matuszkiewicz, G.
    Szwalbe, L.
    Janerka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381477.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gray cast iron
    ductile cast iron
    thermal analysis
    DTA
    cast iron properties
    holding time
    temperature
    overheating temperature
    żeliwo szare
    żeliwo sferoidalne
    analiza termiczna
    właściwości żeliwa
    temperatura
    temperatura przegrzania
    Opis:
    This paper presents the problems related to smelting gray and ductile cast iron. Special attention is paid to the metallurgical quality of cast iron. It depends on the type of furnace, charge materials and the special combination of charge, overheating and holding temperature, melting time, modification and spheroidization method. The evaluation of metallurgical quality has been performed by using derivative-thermal analysis (DTA). During the smelting process and secondary metallurgy, the ITACA system was used allowing to obtain information on alloy characteristic temperatures (Tliquidus, TeMin, TeMax, Tsolidus), VPS value, recalescence value, IGQ coefficient, nucleation gauge, porosity etc. The results of investigations and calculations are displayed in the form of graphs and dependencies. It has been shown that the derivative-thermal analysis (DTA) is an effective complement of chemical analysis and it has been found that both the increase in temperature and metal holding time have a negative impact on the metallurgical quality of liquid metal. The metallurgical quality can be improved by using proper composition of charge materials and modifiers.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 105-110
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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