Autor: Bury, T. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Evaluation of passive autocatalytic recombiners operation efficiency by means of the lumped parameter approach
Autorzy:: Bury, T.
Tematy:: hydrogen
lumped parameter modeling
nuclear reactor
passive autocatalytic recombiners; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148515.pdf Link otwiera się w nowym oknie
Opis:: The problem of hydrogen behavior in containment buildings of nuclear reactors belongs to thermal- -hydraulic area. Taking into account the size of systems under consideration and, first of all, safety issues, such type of analyses cannot be done by means of full-scale experiments. Therefore, mathematical modeling and numerical simulations are widely used for these purposes. A lumped parameter approach based code HEPCAL has been elaborated in the Institute of Thermal Technology of the Silesian University of Technology for simulations of pressurized water reactor containment transient response. The VVER-440/213 and European pressurised water reactor (EPR) reactors containments are the subjects of analysis within the framework of this paper. Simulations have been realized for the loss-of-coolant accident scenarios with emergency core cooling system failure. These scenarios include core overheating and hydrogen generation. Passive autocatalytic recombiners installed for removal of hydrogen has been taken into account. The operational effiiency of the hydrogen removal system has been evaluated by comparing with an actual hydrogen concentration and flammability limit. This limit has been determined for the three-component mixture of air, steam and hydrogen. Some problems related to the lumped parameter approach application have been also identified.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Thermodynamic consequences of hydrogen combustion within a containment of pressurized water reactor
Autorzy:: Bury, T.
Tematy:: powstrzymywanie
reaktor jądrowy
spalanie
wodór
combustion
containment
hydrogen
LOCA
nuclear reactor; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/240634.pdf Link otwiera się w nowym oknie
Opis:: Gaseous hydrogen may be generated in a nuclear reactor system as an effect of the core overheating. This creates a risk of its uncontrolled combustion which may have a destructive consequences, as it could be observed during the Fukushima nuclear power plant accident. Favorable conditions for hydrogen production occur during heavy loss-of-coolant accidents. The author used an own computer code, called HEPCAL, of the lumped parameter type to realize a set of simulations of a large scale loss-of-coolant accidents scenarios within containment of second generation pressurized water reactor. Some simulations resulted in high pressure peaks, seemed to be irrational. A more detailed analysis and comparison with Three Mile Island and Fukushima accidents consequences allowed for withdrawing interesting conclusions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Prediction of a cross-flow heat exchanger performance in media flow maldistribution conditions
Prognozowanie efektywności pracy krzyżowoprądowego wymiennika ciepła w warunkach niejednorodnego przepływu czynników
Autorzy:: Bury, T.
Składzień, J.
Tematy:: krzyżowoprądowy wymiennik ciepła
analiza termodynamiczna
HEWES
cross-flow heat exchanger
thermodynamical analysis; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/172859.pdf Link otwiera się w nowym oknie
Opis:: The paper deals with numerical thermodynamic analyses of cross-flow finned tube heat exchangers of the gas-liquid type. The authors postulate that some improvement of the heat exchanger performance may be achieved by applying a special ribbing structure - fitted to certain media flow conditions. First, the measurements have been carried out in order to determine the air inflow non-uniformity and next an own computer code HEWES has been used for numerical simulations in order to evaluate the impact of the measured non-uniformity on the exchangers' efficiency for the heat exchangers with unified ribbing structure. The numerical simulations have been repeated for heat exchangers with special ribbing structures - determined on the basis of experimental results. Results confirm the hypothesis - some increase in the total heat flow rate may be observed for the considered heat exchanger.
Praca dotyczy termodynamicznej analizy krzyżowoprądowego, ożebrowanego wymiennika ciepła typu gaz-ciecz. Autorzy weryfikowali hipotezę zakładającą możliwość uzyskania poprawy efektywności działania urządzenia w wyniku zastosowania specjalnej, dostosowanej do warunków przepływu czynników, struktury ożebrowania. W pierwszej kolejności wykonane zostały pomiary określające zakres i postać niejednorodnego dopływu powietrza do analizowanego wymiennika ciepła, a następnie wykorzystano własny kod komputerowy HEWES do oceny wpływu tej niejednorodności na wydajność cieplną wymiennika. Obliczenia te dotyczyły wymiennika ciepła z jednorodnym ożebrowaniem. Symulacje numeryczne zostały następnie powtórzone dla przypadku wymiennika ze specjalną strukturą ożebrowania, która została dobrana dla wyznaczonych eksperymentalnie warunków dopływu powietrza. Uzyskane rezultaty potwierdzają postawioną na wstępie hipotezę - widoczny jest pewien wzrost wartości strumienia ciepła przekazywanego w wymienniku.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Utilization of the horizontal ground heat exchanger in the heating and cooling system of a residential building
Autorzy:: Hanuszkiewicz-Drapała, M.
Bury, T.
Tematy:: heat pump
ground heat exchanger
heating system
numerical modelling
pompa ciepła
gruntowy wymiennik ciepła
system grzewczy
modelowanie numeryczne; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/240110.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the results of thermodynamic analyses of a system using a horizontal ground heat exchanger to cool a residential building in summer and heat it in the autumn-winter period. The main heating device is a vapour compression heat pump with the ground as the lower heat source. The aim of the analyses is to examine the impact of heat supply to the ground in the summer period, when the building is cooled, on the operation of the heating system equipped with a heat pump in the next heating season, including electricity consumption. The processes occurring in cooling and heating systems have an unsteady nature. The main results of the calculations are among others the time-dependent values of heat fluxes extracted from or transferred to the ground heat exchanger, the fluxes of heat generated by the heat pump and supplied to the heated building by an additional heat source, the parameters in characteristic points of the systems, the temperature distributions in the ground and the driving electricity consumption in the period under analysis. The paper presents results of analysis of cumulative primary energy consumption of the analyzed systems and cumulative emissions of harmful substances.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: CFD modeling of passive autocatalytic recombiners
Autorzy:: Orszulik, M.
Fic, A.
Bury, T.
Tematy:: nuclear reactor
hydrogen
passive autocatalytic recombiners
CFD modeling; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147615.pdf Link otwiera się w nowym oknie
Opis:: This study deals with numerical modeling of passive autocatalytic hydrogen recombiners (PARs). Such devices are installed within containments of many nuclear reactors in order to remove hydrogen and convert it to steam. The main purpose of this work is to develop a numerical model of passive autocatalytic recombiner (PAR) using the commercial computational fluid dynamics (CFD) software ANSYS-FLUENT and tuning the model using experimental results. The REKO 3 experiment was used for this purpose. Experiment was made in the Institute for Safety Research and Reactor Technology in Julich (Germany). It has been performed for different hydrogen concentrations, different flow rates, the presence of steam, and different initial temperatures of the inlet mixture. The model of this experimental recombiner was elaborated within the framework of this work. The influence of mesh, gas thermal conductivity coefficient, mass diffusivity coefficients, and turbulence model was investigated. The best results with a good agreement with REKO 3 data were received for k-ε model of turbulence, gas thermal conductivity dependent on the temperature and mass diffusivity coefficients taken from CHEMKIN program. The validated model of the PAR was next implemented into simple two-dimensional simulations of hydrogen behavior within a subcompartment of a containment building.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Validation of the heat and mass transfer models within a pressurized water reactor containment using the International Standard Problem No. 47 data
Autorzy:: Bury, T.
Składzień, J.
Fic, A.
Tematy:: analiza cieplno-przepływowa
powstrzymywanie
containment
ISP-47
lumped parameter code
PWR
thermal-hydraulic analysis; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/240576.pdf Link otwiera się w nowym oknie
Opis:: A lumped parameter type code, called HEPCAL, has been worked out in the Institute of Thermal Technology of the Silesian University of Technology for simulations of a pressurized water reactor containment transient response to a loss-of-coolant accident. The HEPCAL code has been already verified and validated against available experimental data, which in fact have been taken from separate effect tests mainly. This work is devoted to validation of the latest version of the HEPCAL code against experimental data from more complex tests. These experiments have been performed on three different test rigs (called TOSQAN,MISTRA and ThAI) and a part of them became the basis of the International Standard Problem No. 47 (ISP-47) dedicated to containment thermal-hydraulics. Selected experiments realized within the framework of the ISP-47 project have been simulated using the HEPCAL-AD code. The obtained results allowed for drawing of some important conclusions concerning heat and mass transfer models (especially steam condensation), two-phase flow model and buoyancy effects.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Experimental and numerical analyses of finned cross flow heat exchangers efficiency under non-uniform gas inlet flow conditions
Autorzy:: Bury, T.
Składzień, J.
Widziewicz, K.
Tematy:: analiza eksperymentalna
analiza numeryczna
krzyżowo-płytowy wymiennik ciepła
nierównomierny przepływ płynu
cross-flow heat exchangers
experimental analysis
non-uniform fluid flow
numerical analysis; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/240548.pdf Link otwiera się w nowym oknie
Opis:: The work deals with experimental and numerical thermodynamic analyses of cross-flow finned tube heat exchangers of the gas-liquid type. The aim of the work is to determine an impact of the gas non-uniform inlet on the heat exchangers performance. The measurements have been carried out on a special testing rig and own numerical code has been used for numerical simulations. Analysis of the experimental and numerical results has shown that the range of the non-uniform air inlet to the considered heat exchangers may be significant and it can significantly affect the heat exchanger efficiency.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Analysis of radiative heat transfer impact in cross-flow tube and fin heat exchangers
Autorzy:: Hanuszkiewicz-Drapała, M.
Bury, T.
Widziewicz, K.
Tematy:: heat exchangers
radiative heat transfer
numerical model
experimental validation
wymienniki ciepła
radiacyjna wymiana ciepła
model numeryczny
weryfikacja doświadczalna; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/240216.pdf Link otwiera się w nowym oknie
Opis:: A cross-flow, tube and fin heat exchanger of the water – air type is the subject of the analysis. The analysis had experimental and computational form and was aimed for evaluation of radiative heat transfer impact on the heat exchanger performance. The main element of the test facility was an enlarged recurrent segment of the heat exchanger under consideration. The main results of measurements are heat transfer rates, as well as temperature distributions on the surface of the first fin obtained by using the infrared camera. The experimental results have been next compared to computational ones coming from a numerical model of the test station. The model has been elaborated using computational fluid dynamics software. The computations have been accomplished for two cases: without radiative heat transfer and taking this phenomenon into account. Evaluation of the radiative heat transfer impact in considered system has been done by comparing all the received results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A model of hydrogen passive autocatalytic recombiner and its validation via CFD simulations
Autorzy:: Orszulik, M.
Fic, A.
Bury, T.
Składzień, J.
Tematy:: nuclear reactor
containment
hydrogen
numerical modeling
CFD
reaktor jądrowy
powstrzymywanie
wodór
modelowanie numeryczne; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/240045.pdf Link otwiera się w nowym oknie
Opis:: Passive autocatalytic recombiners (PAR) is the only used method for hydrogen removal from the containment buildings in modern nuclear reactors. Numerical models of such devices, based on the CFD approach, are the subject of this paper. The models may be coupled with two types of computer codes: the lumped parameter codes, and the computational fluid dynamics codes. This work deals with 2D numerical model of PAR and its validation. Gaseous hydrogen may be generated in water nuclear reactor systems in a course of a severe accident with core overheating. Therefore, a risk of its uncontrolled combustion appears which may be destructive to the containment structure.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Ocena użytków zielonych odnowionych metodą pełnej uprawy położonych na glebie organicznej w dolinie rzeki Randow (Niemcy)
The evaluation of grasslands restored with full cultivation method and located on organic soil in the valley of the river Randow (Germany)
Autorzy:: Czyz, H.
Janicke, H.
Kitczak, T.
Bury, M.
Wydawca:: Polskie Towarzystwo Łąkarskie
Powiązania:: https://bibliotekanauki.pl/articles/75609.pdf Link otwiera się w nowym oknie
Opis:: The performed study, involving the restoration of grasslands with full cultivation method on organic soil in the valley of the river Randow (Germany) – (Raminer Agrar GmbH & Co), revealed great suitability of this method for restoration of grasslands, and the grass mixture characterised by the highest productive potential among all mixtures used for sowing was Festuca arundinacea – 50% + Dactylis glomerata – 40% + Poa pratensis – 10%. Parameters of forage quality (crude protein, soluble sugars, crude fibre, net energy) reached similar levels on all objects, however they depended greatly on the harvested swath, where the first swath was superior.
Dostawca treści:: Biblioteka Nauki

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