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Wyszukujesz frazę "Piwowarski, M." wg kryterium: Autor


Wyświetlanie 1-14 z 14
Tytuł:
Design analysis of ORC micro-turbines making use of thermal energy of oceans
Autorzy:
Piwowarski, M.
Powiązania:
https://bibliotekanauki.pl/articles/258880.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Ocean Thermal Energy Conversion (OTEC) cycles
organic Rankine cycle (ORC)
low-boiling media
steam turbines
turbine design
Opis:
The article presents the results of the analysis of energy conversion cycles making use of thermal energy of oceans. The objects of analysis were two cases of closed Organic Rankine Cycle (ORC) power plants, which were: the cycle in which the vapour of the working medium was produced by warm oceanic water in the circum-equatorial zone, and the so-called “arctic” cycle in which this vapour was produced by non-frozen water in the circumpolar zone. Between ten and twenty low-boiling media were examined for which operating parameters were optimised to obtain the highest cycle efficiency. A preliminary design of an ORC turbine which was obtained by optimising basic design parameters is included. It has been proved that realisation of the Ocean Thermal Energy Conversion (OTEC) cycle is possible both in the warm and permanently frozen regions. The results of the calculations have also revealed that the efficiency of the OTEC cycle is higher in the circumpolar zone. Selecting a low-boiling medium and designing a highly efficient turbine operating in both abovementioned regimes is technically realisable.
Źródło:
Polish Maritime Research; 2013, 2; 48-60
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of steam cycles with respect to supercritical parameters
Autorzy:
Piwowarski, M.
Powiązania:
https://bibliotekanauki.pl/articles/259363.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
analysis of supercritical power stations
optimization of steam cycles
supercritical parameters
concerns cycles
Opis:
This paper contains an analysis of supercritical power stations have been presently built worldwide. The analysis concerns cycles with single and double interstage superheating and, additionally, with regenerative feed water preheating system equipped with six, seven, eight, nine and ten regenerative heat exchangers, respectively. Relevant calculations were performed for various values of fresh steam temperature and pressure, various pressure values of secondary superheating, as well as with value of condenser internal pressure maintained constant. The calculations show that to increase efficiency of steam cycle with double interstage superheating and extended regeneration even to a value greater than 51%, is possible. In the age of greater and greater demand for electric power and stronger and stronger limitations imposed on emission of noxious compounds to the atmosphere, the developing of power production technologies based on supercritical parameters seems inevitable.
Źródło:
Polish Maritime Research; 2009, S 1; 45-51
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of technical efficiency of heat and electric power generation
Autorzy:
Piwowarska, H.
Piwowarski, M.
Powiązania:
https://bibliotekanauki.pl/articles/259361.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Data Envelopment Analysis (DEA)
technical efficiency
Malmquist index
thermal power generation
Opis:
This paper presents an evaluation of technical efficiency and time-dependent changes in productivity of Polish professional electric power and heat & electric power stations by using Data Envelopment Analysis non-parametric method. The research covered the enterprises whose total available electric power amounted to about 98% of that of all professional thermal electric power stations in this country. The analysis has concerned the years 2000÷2004. Impact was considered of such factors as: scale of enterprise activity, form of ownership as well as type of carried out activity, on technical efficiency and time-dependent productivity changes. Changes in productivity of the power generation sector were determined by means of Malmquist index.
Źródło:
Polish Maritime Research; 2009, S 1; 39-44
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design analysis of turbines for co-generating micro-power plant working in accordance with organic Rankine’s cycle
Autorzy:
Mikielewicz, J.
Piwowarski, M.
Kosowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/259369.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
micro power plant
microturbines
organic Rankine cycle
turbine design
Opis:
This paper presents results of a design analysis of turbines for co-generating micro-power plant working in accordance with organic Rankine’s cycle and using biofuel. The heat power range from 25 kW to 100 kW with corresponding available electric power from 2kW to 12kW, was considered. Designs of axial-flow turbines (single-stage and multi-stage ones, also those partially fed), radial-flow and axial-radial -flow ones, were analyzed. Particular variants of the solutions were compared to each other.
Źródło:
Polish Maritime Research; 2009, S 1; 34-38
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological potential of post-industrial areas and sustainable landscape architecture
Potencjal ekologiczny terenów poprzemyslowych a zrównowaz ona architektura krajobrazu
Autorzy:
Schwerk, A.
Dymitryszyn, I.
Piwowarski, M.
Powiązania:
https://bibliotekanauki.pl/articles/81468.pdf
Data publikacji:
2016
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Horticulture and Landscape Architecture; 2016, 37
1898-8784
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Horticulture and Landscape Architecture
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design analysis of Tesla micro-turbine operating on a low-boiling medium
Autorzy:
Lampart, P.
Kosowski, K.
Piwowarski, M.
Jędrzejewski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/259365.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Tesla turbine
axial flow bladed turbine
flow efficiency
CFD calculations
RANS model
Opis:
This paper presents results of the design analysis of a Tesla bladeless turbine intended for a co-generating micro-power plant of heat capacity 20 kW, which operates in an organic Rankine cycle on a low-boiling medium. Numerical calculations of flow in several Tesla turbine models were performed for a range of design parameters. Results of investigations exhibit interesting features in the distribution of flow parameters within the turbine interdisk space. The calculated flow efficiency of the investigated Tesla turbine models show that the best obtained solutions can be competitive as compared with classical small bladed turbines.
Źródło:
Polish Maritime Research; 2009, S 1; 28-33
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research into flows in turbine blade seals. Part I: research methods
Autorzy:
Badur, J.
Kosowski, K.
Stępień, R.
Piwowarski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1955758.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
turbine seals
CFD calculations
experimental investigations
Opis:
Flows in the shroud clearance affect leakage losses and, thus, the turbine stage efficiency. However, at the same time, the distribution of pressure in the seal gaps plays an important role in the generation of the so-called "pressure forces", which may cause self-excited rotor vibrations of the aerodynamic type. Our investigations were carried out in order to show how a CFD code can cope with determining the pressure field in a rotor-blade shroud clearance. Experimental investigations of the pressure field in the shroud clearance were performed on a one-stage air model turbine of the impulse type. Measurements of pressure distribution were carried out for various rotor speeds and turbine loads. 3D calculations of flows in the model turbine were performed using the FLUENT CFD code. The calculations were carried out for the same variants which had been measured experimentally. In this part of the paper, the experimental stand and the numerical methods are described, while a detailed numerical analysis and a comparison between the experimental and the calculated results are presented in parts II and III, respectively.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 309-317
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research into flows in turbine blade seals. Part III: Numerical calculations versus experiment
Autorzy:
Kosowski, K.
Stępień, R.
Piwowarski, M.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/1955750.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
turbine seals
CFD calculations
experimental investigations
Opis:
Experimental and theoretical investigations of the pressure field in the shroud clearance were performed on a one-stage air model turbine of the impulse type. Measurements of pressure distribution were carried out for various rotor speeds and turbine loads. 3D calculations of flows in this turbine were performed using the FLUENT CFD code. The calculations were carried out for variants which had been measured experimentally. The experimental data have been compared to theoretical results obtained with 3D codes for turbomachinery calculations. The Sliding Mesh and Multiple Reference methods have given very similar results of average values of pressure distribution and the velocity field in the shroud clearance. These results correspond to the experimental data. The pressure pulsations were determined only by the Sliding Mesh method, and these results have also been compared with the experiment. Stage flow calculations carried by the Sliding Mesh method with a structural shroud mesh and with a minimum number of 2-2.5 million cells have given a range of non-stationary pressure pulsations corresponding to the experimental data.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 329-336
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and investigations of the ethanol microturbine
Autorzy:
Kosowski, K.
Piwowarski, M.
Stępień, R.
Włodarski, W.
Powiązania:
https://bibliotekanauki.pl/articles/239955.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
micro-power generation
microturbine
ORC power plants
wytwarzanie
mikroenergia
mikroturbina
siłownie ORC
Opis:
The paper presents the results of the design analysis and experimental investigations of the microturbine set consisting of the microturbine with partial admission and permanent magnet generator. The microturbine was designed for operation with the vapour of ethanol as a working fluid. Microturbine unit was tested for different parameters of the working fluid and varying the electrical load. The examples and the comparison between experiment results and numerical simulations are shown and discussed in the paper.
Źródło:
Archives of Thermodynamics; 2018, 39, 2; 41-54
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genesis of Administrative Aspect of the II Stream of Security Culture. Western Perspective
Autorzy:
Piwowarski, Juliusz
Sokołowski, Witold M.
Powiązania:
https://bibliotekanauki.pl/articles/1832625.pdf
Data publikacji:
2017
Wydawca:
Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Tematy:
Max Weber
bureaucracy
dehumanisation
postmodernity
security
Opis:
Administration is one of the crucial systems for functioning of a state – organisation which is supposed to provide security at collective level for its citizens. Values under which administration operates, are important for security culture of the whole society (II stream of security culture). Concept of Max Weber’s ideal type of administration – bureaucracy – was at time of its creation an innovative way of thinking about the state, but as the time passed, several pathologic phenomena had occurred. Authors present here a sketch of Weber’s concept and its influence on temporary erosion of values.
Źródło:
Security Dimensions; 2017, 23(23); 200-212
2353-7000
Pojawia się w:
Security Dimensions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contribution to the bryoflora of the Roztocze National Park (SE Poland) - Bryophytes of the Swierszcz river valley
Autorzy:
Fudali, E.
Zubel, R.
Stebel, A.
Rusinska, A.
Gorski, P.
Voncina, G.
Rosadzinski, S.
Cykowska-Marzencka, B.
Stanaszek-Kik, M.
Wierzcholska, S.
Wolski, G.J.
Wojterska, M.
Wilhelm, M.
Paciorek, T.
Piwowarski, B.
Powiązania:
https://bibliotekanauki.pl/articles/790668.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu
Tematy:
bryoflora
Roztocze National Park
Polska
bryophyte
Swierszcz River
river valley
mountain species
threatened species
Opis:
New distribution data for 171 bryophyte taxa in the Roztocze National Park are provided. Among them there are 43 species protected by law in Poland, including 20 strictly protected species, as well as 13 species threatened in Poland. The research revealed 36 species (5 liverworts and 31 mosses) new for the region. Noteworthy is the occurrence of 19 mountain species and 10 bryophytes thought to be relicts of old-growth forests what confirms the specificity of nature of the Roztocze region. The most valuable and interesting finds are: mosses Campylophyllopsis sommerfeltii (Myrin) Ochyra, Dicranum viride (Sull. & Lesq.) Lindb., Buxbaumia viridis (Moug. ex Lam. & DC.) Brid. ex Moug. & Nestl. as well as liverworts Calypogeia suecica (Arnell et J. Perss.) Müll. Frib. and Cephalozia catenulata (Huebener) Lindb. A brief characterisations of these species are presented.
Źródło:
Steciana; 2015, 19, 1
1689-653X
Pojawia się w:
Steciana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contribution to the bryoflora of the “boczki” nature reserve (puszcza romincka forest)
Materiały do brioflory rezerwatu przyrody boczki (puszcza romincka)
Autorzy:
Fojcik, B.
Zubel, R.
Wierzcholska, S.
Rosadzinski, S.
Staniaszek-Kik, M.
Rusinska, A.
Szczepanski, M.
Voncina, G.
Wolski, G.
Ciurzycki, W.
Gorski, P.
Piwowarski, B.
Pawlikowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/790529.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu
Opis:
The results of bryological investigations from the “Boczki” nature reserve, located in Puszcza Romincka Forest, are presented. The reserve was established in 1974 for protection well preserved forest communities characteristic of the Romincka Primeval Forest. 154 bryophyte species were recorded – 37 liverworts and 117 mosses, including 37 unpublished species from the Puszcza Romincka Forest. In respect of frequency the main group make rare species – 29.2%, the least numerous were frequent – 21.4%. Terrestrial and epixylic habitats were the richest – refer 98 and 85 species respectively. Significant were groups of protected (47) and endangered (14) species. There is also a large share of bryophytes considered as primeval forest species – seven liverworts and 24 mosses, Antitrichia curtipendula and Zygodon rupestris among them.
Źródło:
Steciana; 2017, 21, 4
1689-653X
Pojawia się w:
Steciana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New distributional data on bryophytes of Poland and Slovakia, 3
Autorzy:
Gorski, P.
Rosadzinski, S.
Rusinska, A.
Pawlikowski, P.
Wilhelm, M.
Zubel, R.
Piwowarski, B.
Staniaszek-Kik, M.
Fojcik, B.
Wolkowycki, D.
Lisowski, S.
Pisarek, W.
Aniol, A.
Tracz, J.
Powiązania:
https://bibliotekanauki.pl/articles/790523.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu
Tematy:
new data
distributional data
bryophyte
locality
Polska
Slovakia
Źródło:
Steciana; 2015, 19, 3
1689-653X
Pojawia się w:
Steciana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contribution to the bryoflora of the Swietokrzyski National Park (Central Poland)
Autorzy:
Stebel, A.
Rosadzinski, S.
Gorski, P.
Fojcik, B.
Rusinska, A.
Voncina, G.
Szczepanski, M.
Wilhelm, M.
Fudali, E.
Paciorek, T.
Staniaszek-Kik, M.
Zubel, R.
Piwowarski, B.
Wolski, G.J.
Salachna, A.
Smolinska, D.
Pierscinska, A.
Powiązania:
https://bibliotekanauki.pl/articles/878494.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu
Tematy:
contribution
bryoflora
moss
liverwort
protected species
threatened species
species distribution
Swietokrzyski National Park
Polska
Opis:
New distribution data for 183 species, one subspecies and four varieties of bryophytes in the Świętokrzyski National Park are provided. The most interesting species (rare, protected and new for the area) are Anastrophyllum hellerianum, Buxbaumia viridis, Cephalozia catenulata, Dicranum viride, Lophozia ascendens, Mannia fragrans and Tetraplodon angustatus.
Źródło:
Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2013, 17
1896-1908
Pojawia się w:
Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-14 z 14

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