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    Wyświetlanie 1-8 z 8
    Tytuł:
    Glacio−meteorology of Ebbabreen, Dickson Land, central Svalbard, during 2008–2010 melt seasons
    Autorzy:
    Małecki, Jakub
    Powiązania:
    https://bibliotekanauki.pl/articles/2049629.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    Spitsbergen
    glacier
    meteorology
    energy balance
    Źródło:
    Polish Polar Research; 2015, 2; 145-161
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy balance in self-powered MR damper-based vibration reduction system
    Autorzy:
    Snamina, J.
    Sapiński, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/202332.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MR damper
    electromagnetic generator
    vibration
    energy balance
    Opis:
    The study is focused on the energy balance in self-powered vibration reduction system with a linear magnetorheological (MR) damper. The mathematical model of the vibration reduction system is outlined and numerical simulation data are provided. The model involves the mechanical and electrical sub-systems of the electromagnetic generator and an MR damper. For the purpose of the numerical simulations, the parameters of the model were identified through experiments. The objective of the simulations was to establish the energy balance of the system. Energy fluxes associated with energy inputs and outputs as well as a rate of change of inertial energy were determined.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 1; 75-80
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical model and measurements of a combi-steamer condensation hood
    Autorzy:
    Tokarski, Mieszko
    Ryfa, Arkadiusz
    Buliński, Piotr
    Rojczyk, Marek
    Ziarko, Krzysztof
    Nowak, Andrzej J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240444.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    energy balance
    heat transfer
    heat exchanger
    condensation
    condensation hood
    Opis:
    Combi-steamer condensation hoods are widely used in modern gastronomy. They condense steam produced by the combi-steamer and also filter solid particles, moisture, grease and smells. All these factors negatively affect the staff and dishes, so efficient work of the condensation hoods becomes important. A mathematical and experimental analysis of such a device is described in this paper. First a measurement methodology was designed and measurements of air humidity, temperature and mass flow rates were performed. The measurement procedure concerned dedicated a steam generator and combi-steamer. Next a mathematical model was developed. It was based on mass and energy balances of the condensation hood. The condensate flow rate turned out to be insufficient to fulfill the energy balance while measured directly. Hence, it was calculated from heater’s power of the steam generator and the balance model was validated. The combisteamer had an unknown output, so the condensate flow rate was provided by the balance model after its validation. A preliminary diagnosis of the device was carried out as well.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 1; 125-149
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the rotor eccentricity on the torque of a cage induction machine
    Autorzy:
    Silwal, B.
    Rasilo, P.
    Belahcen, A.
    Arkkio, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/141083.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cage induction machine
    dynamic eccentricity
    electromagnetic torque
    energy balance
    finite element method
    harmonics
    Opis:
    The non-uniform air gap in an electrical machine caused by rotor eccentricity creates an asymmetrical flux-density distribution in the air gap. This can affect the nominal torque produced by the machine. Eccentricity also produces forces that act on the rotor which may also have an effect on the torque. Thus, it is important to know how the torque of the machine behaves. In this paper, the torque of a cage induction machine is studied when the machine has dynamic eccentricity. The study is performed using the finite element method and a magnetic vector potential formulation. The torque is calculated by the method of energy balance. The harmonic components of the torque are also analyzed. The results show that the machine under eccentricity does not exhibit the same torque as a normal healthy machine. The harmonic components around the first principal slot harmonic is most affected.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 2; 383-396
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy Balance Sheet of a Semi Operational Thermic System
    Autorzy:
    Honus, S.
    Sassmanová, V.
    Frantík, J.
    Bukowski, P.
    Juchelková, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/185341.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bilans energetyczny
    piroliza
    odpady
    spalanie
    gaz procesowy
    energy balance
    pyrolysis
    waste
    combustion
    process gas
    Opis:
    The article is focused onthe energetical balance of a technical system for the conversion of crushed tyres by pyrolysis. Process temperatures were set in the range from 500 to 650°C. Mass input of the material was 30 kg per hour. The aim of the article is to answer the following questions as regards the individual products: Under which process conditions can the highest quality of the individual products related to energy be reached? How does the thermal efficiency of the system change in reaction to various conditions of the process? On the basis of the experimental measurements and calculations, apart from other things, it was discovered that the pyrolysis liquid reaches the highest energetic value, i.e. 42.7 MJ.kg-1, out of all the individual products of the pyrolysis process. Generated pyrolysis gas disposes of the highest lower calorific value 37.1 MJ.kg-1 and the pyrolysis coke disposes of the maximum 30.9 MJ kg-1. From the energetic balance, the thermal efficiency of the experimental unit under the stated operational modes ranging from about 52 % to 56 % has been estimated. Individual findings are elaborated on detail in the article.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 3; 317-329
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of heat transfer in combustion chamber waterwall tubes of supercritical steam boilers
    Autorzy:
    Grądziel, S.
    Majewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/185848.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    waterwall tube
    supercritical steam boiler
    mathematical model
    energy balance
    thermal load
    rura ekranowa
    kocioł parowy
    model matematyczny
    balans energetyczny
    obciążenie cieplne
    Opis:
    The paper presents the results of numerical computations performed for the furnace chamber waterwalls of a supercritical boiler with a steam output of 2400 x 10[3] kg/h. A model of distributed parameters is proposed for the waterwall operation simulation. It is based on the solution of equations describing the mass, momentum and energy conservation laws. The aim of the calculations was to determine the distribution of enthalpy, mass flow and fluid pressure in tubes. The balance equations can be brought to a form where on the left-hand side space derivatives, and on the right-hand side – time derivatives are obtained. The time derivatives on the right-hand side were replaced with backward difference quotients. This system of ordinary differential equations was solved using the Runge-Kutta method. The calculation also takes account of the variable thermal load of the chamber along its height. This thermal load distribution is known from the calculations of the heat exchange in the combustion chamber. The calculations were carried out with the zone method.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 2; 199-213
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental estimation of thermal emissivity for the roofing paper in blue colour
    Autorzy:
    Zapałowicz, Zbigniew
    Walterowicz, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/240669.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    blue roof cover
    thermal emissivity of roof
    reflectivity of roof
    energy balance for roof
    dach
    pokrywa
    emisyjność cieplna
    współczynnik odbicia
    bilans energetyczny
    Opis:
    Effective use of energy in various branches of economy is one of world trends in development of power engineering. Relevant energy consumption occurs during exploitation of buildings, so there is still potential to diminish it as far as heating, ventilation, and air conditioning are concerned. Particularly in summer season, the choice of respective roofing colour can play a decisive role for the heat flux transferred to the inside of the object. Decrease of heat flux causes a lower heat burden to the building and lower power consumption by the air conditioning systems. In winter, on the contrary, heat flux transferred to building’s interior should be higher, as a result, demand of energy for heating will be lower. However, calculations of the heat flux require that energy balance must be made for the object. Unfortunately, not all producers of roofing covers inform about the values of reflectivity and thermal emissivity of their products, which is, in turn, necessary for calculations. In the present paper, research methodology elaborated by authors is proposed for determination of thermal emissivity of roofing covers. The paper presents test stand, methodology, and research results for roofing paper in blue colour (as an example) for which the thermal emissivity is an unknown parameter.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 3; 181-194
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of operation problems at a 200 MWe PF boiler
    Autorzy:
    Peta, S.
    Toit, C. du
    Naidoo, R.
    Schmitz, W.
    Jestin, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/185774.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    process flow modeling
    mass and energy balance
    furnace CFD modeling
    PF swirl burner
    proces modelowania przepływu
    bilans masy i energii
    modelowanie pieca CFD
    Opis:
    To minimize oxides of nitrogen (NOx) emission, maximize boiler combustion efficiency, achieve safe and reliable burner combustion, it is crucial to master global boiler and at-the-burner control of fuel and air flows. Non-uniform pulverized fuel (PF) and air flows to burners reduce flame stability and pose risk to boiler safety by risk of reverse flue gas and fuel flow into burners. This paper presents integrated techniques implemented at pilot ESKOM power plants for the determination of global boiler air/flue gas distribution, wind-box air distribution and measures for making uniform the flow being delivered to burners within a wind-box system. This is achieved by Process Flow Modelling, at-the-burner static pressure measurements and CFD characterization. Global boiler mass and energy balances combined with validated site measurements are used in an integrated approach to calculate the total (stoichiometric + excess) air mass flow rate required to burn the coal quality being fired, determine the actual quantity of air that flows through the burners and the furnace ingress air. CFD analysis and use of at-the-burner static, total pressure and temperature measurements are utilized in a 2-pronged approach to determine root-causes for burner fires and to evaluate secondary air distribution between burners.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 3; 305-320
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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