Wyniki wyszukiwania - Biblioteka Nauki

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Model hybrydowego nadprzewodzącego ekranu magnetycznego

100%

Tomków Ł.

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2014

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tom T. 1

217--224

PL

Rozwój technik pomiarowych pola magnetycznego za pomocą superczułych sensorów wymaga stosowania technik ekranowania medycznego by zminimalizować wpływ zewnętrznych pól magnetycznych. Zastosowanie nadprzewodników wysokotemperaturowych pozwala na uzyskanie próżni magnetycznej dla stałego i niskoczęstotliwościowego zewnętrznego pola magnetycznego. Obecnie stosowane lite ekrany umożliwiają ekranowanie tylko pól magnetycznych o stosunkowo niskim natężeniu. Niniejsza praca zawiera opis modelu hybrydowego ekranu wykorzystującego dodatkowo pierścienie z powlekanej taśmy nadprzewodzącej dla zwiększenia efektywności ekranowania.

2

Domestic hydrogen installation in Poland – technical and economic analysis

63%

Cholewiński M. , Tomków Ł.

Archives of Electrical Engineering

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2015

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tom Vol. 64, nr 2

189--196

EN

The application of renewable energy sources poses the problems connected with output volatility. In order to decrease this effect the energy storage technologies can be applied, particularly fuel cells connected with hydrogen storage. In this paper the application of SOFC system for a household in Poland is proposed. Economic and technical analysis is performed. It was found that the proposed installation is profitable after 25 years of operation when compared with conventional solution - heat pumps and gas-fired boilers.

3

Modelling of different cogeneration technologies in a power generating unit with pwr reactor in the context of a future polish nuclear power station

63%

Tomków Ł. , Cholewiński M.

Challenges of Modern Technology

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2017

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tom Vol. 8, no. 1

32--36

EN

This paper focuses on the analysis of technical possibilities of a nuclear combined heat and power (NCHP) unit. The possibility of implementing a cogeneration unit in the cooperation with a typical PWR (Pressurized Water Reactor) is assessed by means of the numerical modelling of a process. The base for the model are operational parameters of Ascó Nuclear Power Station in Spain. The power plant employs a PWR reactor with more than 1000 MWe capacity. It is similar in size to a power plant which is planned to be built in Poland. Economic analysis of Tricity region have shown that the optimal amount of heat to be extracted is approximately 270 MWt. The investigated possibilities of heat extraction were the by-pass of a turbine, steam bleeding and partial removal of heat from the network of regenerating heat exchangers. Each of the methods has been assessed based on the criteria of electric power production drop, utilisation factor, weighted utilisation factor and interference with the base operational parameters. It was observed that the extraction of heat may lead to the increase of a power plant economy and fuel utilisation factor.

4

Assessment of district heating needs and technical possibilities in the vicinity of a future polish nuclear power station

63%

Cholewiński M. , Tomków Ł.

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2017

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tom Vol. 5, no. 1

1--10

EN

Nuclear power plants can be a reliable source of heat supplying district heating systems. Importantly, thermal and flow parameters of a secondary loop in pressurized water reactor technologies are sufficient to supply a district heating networks. Therefore, NCHP (Nuclear Combined Heat and Power) systems seem to be a viable replacement for traditional coal-fired cogeneration units located in big cities and may contribute to environmental protection in both local and international scale. In this paper working conditions of a municipal heat network, such as a pressure drop and the heat loses, were calculated and adapted to expected Poland’s first nuclear power plant located in Pomerania Province. Cumulative probability distribution model of heat generation power in metropolitan area and future heat demand have been created and used to identify optimal size of NCHP heat output. Main parameters of heating network were presented and discussed. The positive effects on environment were assessed and summarized as well.

5

Modeling of a nuclear combined heat and power station supplying heat to remote municipal customers - the case of Poland

63%

Cholewiński M. , Tomków Ł.

Journal of Power Technologies

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2018

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tom Vol. 98, nr 3

255--266

EN

Nuclear power is advocated as a cheap, clean and reliable source of electric power for both industry and the household sector. This paper focuses on technical issues relating to commissioning a cogeneration unit for use in combination with a typical Pressurized Water Reactor (PWR). Three heat extraction possibilities were analyzed and modeled in order to identify the most favorable option based on various criteria. The investigated possibilities of heat extraction were turbine bypass, steam bleeding and partial removal of heat from the network of regenerating heat exchangers. The working conditions of a municipal heat network, such as pressure drop and heat losses, were calculated and adapted to the conurbation centered on Gdansk (Poland). Annual demand was analyzed in light of the current state of development of the heating network. The operating parameters of the power plant were based on the Asco Nuclear Power Station in Spain. It was observed that certain heat extraction methods could deliver a significant increase in the weighted utilization factor.

6

Analysis of capacitance of a cryogenic by-pass line for SIS100 particle accelerator at FAIR

51%

Tomków Ł. , Trojanowski S. , Ciszek M. , Chorowski M.

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2018

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tom Vol. 67, nr 4

803--814

EN

Safety and operation efficiency of the particle accelerators strongly depend on the quality of the supplied electric current and is affected by the electric properties of all elements of the circuit. In this paper the capacitance of the superconducting bus-bars applied in the cryogenic by-pass line for the SIS100 particle accelerator at FAIR is analysed. The unit capacitance of the bus-bars is calculated numerically and found experimentally. A 2D numerical model of a cross-section of the cable is applied. The capacitance is found with three methods. The stored energy, electric displacement field and charge gathered on the surfaces of the device are calculated and analysed. The obtained values are consistent. Experimental measurements are performed using the resonance method. The measuring system is undamped using a negative conductance converter. Small discrepancies are observed between numerical and experimental results. The obtained values are within the requirements of the accelerator design.

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Heat generation by eddy currents in a shell of superconducting bus-bars for SIS100 particle accelerator at FAIR

51%

Tomków Ł. , Trojanowski S. , Ciszek M. , Chorowski M.

Archives of Electrical Engineering

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2017

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tom Vol. 66, nr 4

705--715

EN

Superconducting magnets in the SIS100 particle accelerator require the supply of liquid helium and electric current. Both are transported with by-pass lines designed at Wrocław University of Technology. Bus-bars used to transfer an electric current between the sections of the accelerator will be encased in a steel shell. Eddy currents are expected to appear in the shell during fast-ramp operation of magnets. Heat generation, which should be limited in any cryogenic system, will appear in the shell. In this work the amount of heat generated is assessed depending on the geometry of an assembly of the bus-bars and the shell. Numerical and analytical calculations are described. It was found that heat generation in the shell is relatively small when compared to other sources present in the accelerator and its value strongly depends on the geometry of the shell. The distribution of eddy currents and generated heat for different geometrical options are presented. Based on the results of the calculations the optimal design is proposed.