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    Wyświetlanie 1-12 z 12
    Tytuł:
    Resonant frequency stabilization technique in series-series contactless energy transfer systems
    Autorzy:
    Marcinek, M.
    Hołub, M.
    Kalisiak, S.
    Pałka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/140557.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    contactless energy transfer
    frequency stabilization
    inductive energy transfer
    mutual coupled coils
    resonant inverters
    wireless energy transmission
    Opis:
    A technique for stabilization of resonant frequency is proposed in this paper. An additional power circuit, a compensator that allows keeping constant resonance frequency was introduced by the authors. In the presented solution the resonant circuit frequency stabilization is achieved by forcing a zero phase shift between the current and the voltage of the main switching module.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 3; 547-558
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and investigations of inductive power transfer (IPT) systems in terms of efficiency and magnetic field distribution properties
    Autorzy:
    Miśkiewicz, R. M.
    Anczewski, P.
    Moradewicz, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/202253.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    contactless energy transfer
    inductive power transfer
    resonant compensation circuits
    electromagnetic field distribution
    Opis:
    The problems connected to developing inductive power transfer IPT systems in aspects of high efficiency and suppression of electromagnetic field (EMF) emission are discussed. It is shown how important it is to compensate for large leakage impedance of IPT coils (air transformer) to improve efficiency of high power transfer. Such compensation circuits operating with resonant frequencies at soft switching conditions additionally allow for reduction of switching losses in power semiconductor devices of converters. The consideration has been illustrated and verified by experimental results measured on two different test stands (50 kW with planar coils and with two 12 kW receiver coils) built in a laboratory of the Łukasiewicz Research Network – Electrotechnical Institute.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 4; 789-797
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Active glasses as the luminescent sources of radiation for sensor applications
    Autorzy:
    Żmojda, J.
    Dorosz, D.
    Kochanowicz, M.
    Dorosz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/201797.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tellurite glasses
    antimony-silicate glasses
    Yb3+
    Tm3+
    upconversion
    blue luminescence
    energy transfer
    active glasses
    Opis:
    The article presents physicochemical, thermal and spectroscopic properties of two different glass systems: TeO2-GeO2-PbO-PbF2- BaO-Nb2O5-LaF3 and SiO2-Al2O3-Sb2O3, co-doped with Yb3+/Tm3+ ions. Blue upconversion luminescence at a wavelength of 478 nm corresponding to the thulium 1G4 ⇥3H6 transition was observed under 976 nm pump radiation in both of the co-doped glasses. This indicated the existence of efficient Yb3+ ⇥ Tm3+ energy transfer via three-photon absorption mechanism. Thermal and optical results substantiate the claim for practical applicability of the manufactured glasses in design of optical fiber sources.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 393-397
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of excitation energy transfer in PSII particles of Arabidopsis thaliana mutant clpC1
    Autorzy:
    Adamiec, M.
    Lucinski, R.
    Gibasiewicz, K.
    Giera, W.
    Sipinska, W.
    Jackowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/80441.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    excitation energy transfer
    Arabidopsis thaliana
    clpC1 mutant
    polypeptide
    time-resolved fluorescence
    regulatory protein
    chloroplast
    apoprotein
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contactless power interface for plug-in electric vehicles in V2G systems
    Autorzy:
    Miśkiewicz, R.
    Moradewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200061.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bi-directional contactless energy transfer (CET)
    contactless power supply
    smart grids
    series resonant converter
    FPGA based control
    Opis:
    In the paper a bi-directional power electronic interface based on an inductive coupled contactless energy transfer system for plug-in vehicles with Vehicle-to-Grid (V2G) capability is presented. To minimize the total losses of the system, a series resonant compensation circuit is applied assuring Near to Zero-Current Switching (N2ZCS) condition for insulated-gate bipolar transistors. The analytical expression of the dc voltage and current gains as well as energy transfer efficiency is given and discussed. The system uses modified FPGA based integral control method adjusting resonant frequency and guarantees very fast and stable operation. Simulation and experimental results illustrating properties of the developed 40-60kHz switching frequency operated 15kW laboratory prototype are presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 561-568
    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:
    Research on the Portuguese building stock and its impacts on energy consumption – an average U-value approach
    Autorzy:
    Sousa, J.
    Bragança, L.
    Almeida, M.
    Silva, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/231236.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zasoby budynków
    zasoby energii
    zużycie energii
    element konstrukcyjny
    przenikanie ciepła
    współczynnik przenikania ciepła
    building stock
    energy resources
    energy consumption
    structural element
    heat transfer
    heat transfer coefficient
    Opis:
    The article aims to evaluate the Portuguese building stock energy policies and strategy for energy saving in buildings among the EU members. It was found out the average heat transfer coefficients of the main structural elements of Portuguese Buildings and analyzed the U-values of this elements considering different time periods. The fundamentals of this study were funded by the Agency for Development and Innovation (ADI) and co-financed by the European Regional Development Fund (FEDER) through the Operational Program for Competitiveness Factors (POFC) assigned to the Building Physics and Construction Technology Laboratory with the reference SB Tool SPT_2011_4.
    Źródło:
    Archives of Civil Engineering; 2013, 59, 4; 523-546
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The profitability analysis of enhancement of parameters of the thermal insulation of building partitions
    Autorzy:
    Życzyńska, A.
    Cholewa, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/230685.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    efektywność energetyczna
    energia końcowa
    współczynnik przenikania ciepła
    energia użyteczna
    koszt ogrzewania
    energy efficiency
    final energy
    heat transfer coefficient
    useful energy
    heating cost
    Opis:
    The energy saving tendencies, in reference to residential buildings, can be recently seen in Europe and in the world. Therefore, there are a lot of studies being conducted aiming to find technical solutions in order to improve the energy efficiency of existing, modernized, and also new buildings. However, there are obligatory solutions and requirements, which must be implemented during designing stage of the building envelope and its heating/cooling system. They are gathered in the national regulations. The paper describes the process of raising the energy standard of buildings between 1974–2021 in Poland. Therefore, the objective of this study is to show energy savings, which can be generated by modernization of thermal insulation of partitions of existing buildings and by the use of different ways of heat supply. The calculations are made on the selected multi-family buildings located in Poland, with the assumption of a 15 years payback time. It is shown that it is not possible to cover the costs of the modernization works by the projected savings with the compliance to the assumption of 15 years payback time.
    Źródło:
    Archives of Civil Engineering; 2014, 60, 3; 335-347
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal performance evaluation of an earth-to-air heat exchanger for the heating mode applications using an experimental test rig
    Autorzy:
    Ahmad, Saif Nawaz
    Prakash, Om
    Powiązania:
    https://bibliotekanauki.pl/articles/2091363.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer
    earth-to-air heat exchanger
    ground heat exchanger
    geothermal energy
    renewable energy
    assive heating
    assive cooling
    effectiveness
    Opis:
    This paper presents the experimental investigation of an earth-to-air heat exchanger for heating purposes in the Patna region of India, using an experimental test rig. In the view of the author, real field experiments have several limitations such as lack of repeatability and uncontrolled conditions. It also takes more time for the response of parameters that depends on nature and climate. Moreover, earth-to-air heat exchangers may be expensive to fabricate and require more land area. Thus, in this work authors executed their experimental work in indoor controllable environments to investigate the thermal performance of an earth-to-air heat exchanger. The actual soil conditions were created and maintained the temperature at 26°C throughout the soil in the vicinity of pipes. Three horizontal PVC pipes of equal lengths and diameters of 0.0285 m, 0.038 m and 0.0485 m were installed in the test rig. The experiments were performed for different inlet air velocities at ambient air temperature. This study acknowledges that the maximum rise in outlet temperature occurs at a lower speed for smaller pipes. Also, the maximum effectiveness of 0.83 was observed at 2 m/s for the smallest diameter pipe.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 1; 185--207
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal and economic investigation of straight and U-bend double tube heat exchanger with coiled wire turbulator
    Autorzy:
    Andrzejczyk, Rafał
    Muszyński, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/239983.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NTU – number of transfer units
    heat exchanger
    heat transfer coefficient
    energy efficiency
    wymiennik ciepła
    współczynnik wnikania ciepła
    efektywność energetyczna
    metoda NTU
    Opis:
    Experimental research has been carried out for four individual heat exchanger constructions, i.e., plain double tube, turbulized double tube, plain U-bend and U-bend with turbulator. Tests were made for the water-water system. The study covered a wide measuring range, i.e., Re = 800–9000 – on the shell side, for a constant cold water temperature of 9°C and hot water of 50°C. The heat exchangers were made from copper tubes with external diameter of 10 mm and 18 mm respectively and wall thickness of 1 mm. The helicoidal vortex generator was made from brass wire with a diameter of 2.4 mm, coil diameter of 13 mm and pitch of 11 mm. For these geometries, the values of pressure drop, heat flux and heat transfer coefficient were determined. Wire coil turbulator increased the heat transfer coefficient (HTC) over 100% and pressure drop up by 100%. The comparison of heat transfer efficiency was performed based on the number of transfer units-effectivenes (NTU-ε) method. The modified construction achieved a similar efficiency. Economic analysis of wire coil turbulator was made to validate its use in the system. It showed that a coiled wire turbulator can greatly decrease the investment cost of the double tube heat exchanger while maintaining transferred heat at a constant level.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 2; 17-33
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Mathematical Model of Membrane Gas Separation with Energy Transfer by Molecules of Gas Flowing in a Channel to Molecules Penetrating this Channel from the Adjacent Channel
    Autorzy:
    Szwast, M.
    Szwast, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/185043.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    membrane
    membrane module
    reciprocal transfer of energy between gas molecules
    changes of the pressure of gas along the length of flow channel
    membrana
    wzajemne przekazywanie energii między cząsteczkami gazu
    zmiany ciśnienia gazu na długości kanału przepływowego
    Opis:
    The paper presents the mathematical modelling of selected isothermal separation processes of gaseous mixtures, taking place in plants using membranes, in particular nonporous polymer membranes. The modelling concerns membrane modules consisting of two channels – the feeding and the permeate channels. Different shapes of the channels cross-section were taken into account. Consideration was given to co-current and counter-current flows, for feeding and permeate streams, respectively, flowing together with the inert gas receiving permeate. In the proposed mathematical model it was considered that pressure of gas changes along the length of flow channels was the result of both – the drop of pressure connected with flow resistance, and energy transfer by molecules of gas flowing in a given channel to molecules which penetrate this channel from the adjacent channel. The literature on membrane technology takes into account only the drop of pressure connected with flow resistance. Consideration given to energy transfer by molecules of gas flowing in a given channel to molecules which penetrate this channel from the adjacent channel constitute the essential novelty in the current study. The paper also presents results of calculationsobtained by means of a computer program which used equations of the derived model. Physicochemical data concerning separation of the CO2/CH4 mixture with He as the sweep gas and data concerning properties of the membrane made of PDMS were assumed for calculations.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 2; 151-169
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The performance of H2O, R134a, SES36, ethanol, and HFE7100 two-phase closed thermosyphons for varying operating parameters and geometry
    Autorzy:
    Andrzejczyk, R.
    Muszyński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/240401.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-phase closed thermosiphon
    heat pipe
    energy efficiency
    NTU
    number of heat transfer units
    heat recovery
    zamknięty termosyfon dwufazowy
    rura cieplna
    efektywność energetyczna
    liczba jednostek przepływu ciepła
    odzysk ciepła
    Opis:
    In this study, the influences of different parameters at performance two-phase closed thermosiphon (TPCT) was presented. It has been confirmed that the working fluid, as well as operating parameters and fill ratio, are very important factors in the performance of TPCT. The article shows characteristics of gravitational tube geometries, as well as the technical characteristic of the most important system components, i.e., the evaporator/condenser. The experiment’s plan and the results of it for the two-phase thermosiphon for both evaluated geometries with varying thermal and fluid flow parameters are presented. Experiments were performed for the most perspective working fluids, namely: water, R134a, SES36, ethanol and HFE7100. Obtained research proves the possibility to use TPCT for heat recovery from the industrial waste water.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 3; 3-21
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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