Wyniki wyszukiwania - Biblioteka Nauki

1

Renewable energy sources

100%

Mazurek B.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2005

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tom Vol. 42, nr 16

5-8

EN

Burning of coal in energy production causes a considerable degradation of natural environment, hence a tendency occurs to move over to less harmful energy sources - gas, crude oil and biomass. Renewable clean energy sources, such as water power, wind and solar energy gain on importance, and their share in overall energy balance must constantly increase. A new philosophy of the development of power industry is represented by the so called distributed (decentralized) power industry, consisting of a number of small power plants localized near and user. In the nearest future an urgent need will emerge for mobile power units with several to some dozen of megawatts output, mounted on trucks. These units will be used in case of disasters and failures of power nets.

2

ENERGETYKA WODNA W PAKISTANIE. SZANSE I ZAGROŻENIA

86%

Głogowski A.

Polityka i Społeczeństwo

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2018

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nr 2(16)

71-82 (12)

EN

Hydro energy is not the main source of energy for the rapidly developing Pakistani economy, but it is an important element of her energy mix. From the Islamabad's economic interests point of view of, the priority is to limit the scale of blackouts, which slow down the development of economics and make life of Pakistan’s population tougher. Hydro power plants, however, are considered more expensive when it comes to the cost of construction than conventional ones. They have a significant advantage: they do not require fuel, and therefore for a country relatively lacking natural resources it is an interesting alternative. The Indus river basin area is suitable to the construction of this type of infrastructure. However , demographic factors are a serious limitation for the development of this type of infrastructure – the growing population means an increase in the demand for potable water (both for people as well as for the food sector). In addition, environmental risks associated with global warming may also have a negative impact on water supply. International environment is disadvantageous to the development of hydro plants. The Indus Water Treaty, signed with India in 1960, does not match the new challenges posed by both the growing population and the development of hydropower. Therefore, competition in the management of shrinking water resources may lead to an escalation of the conflict between India and Pakistan, lasting over 70 years. An important role for the dynamics of international relations in South Asia, also in the energy and water dimension, has and will have a policy of the People's Republic of China, which is focused on close cooperation with Pakistan, which is considered by India as a thread.

3

Multi-criterion Optimisation of Energy Generation in Multi-unit Hydroelectric Power Plants

72%

Adamkowski A. , Lewandowski M. , Lewandowski S.

Acta Energetica

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2018

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tom nr 1

66--71

EN

Maintaining variable operating conditions of water barrage, imposed upon the owners of hydroelectric power plants by various acts and administrative decisions, requires proper adjustment of power plant water discharge by variable opening of turbine control components. This changes the generated power and thus shifts the hydro units operating point, which alters the power generation efficiency. In power plants equipped with two or more hydro units, it is possible to configure operation of hydro units and load each of them with such active power as to obtain the best possible electrical energy generation efficiency with the available hydroelectric potential of the barrage. In this paper, the method of optimising an example multi-unit hydroelectric power plant using various criteria was described, i.e. the efficiency criterion or the revenue criterion. Particular attention was paid to the maximisation of generation efficiency to ensure the maximum use of the inflow and head available at the barrage under the restrictions due to current conditions.

PL

Dotrzymanie zmiennych warunków użytkowania stopnia wodnego, narzuconych właścicielom elektrowni wodnych w różnego rodzaju aktach i decyzjach administracyjnych, wymaga odpowiedniego dostosowania przełyku elektrowni poprzez zmianę stopnia otwarcia elementów regulacyjnych turbin. Skutkuje to zmianą generowanej mocy i tym samym przesunięciem punktu pracy hydro- zespołów powodującym zmianę sprawności wytwarzania energii. W elektrowniach wyposażonych w dwa lub więcej hydrozespołów można tak dobrać konfigurację pracujących hydrozespołów i każdy z nich obciążyć taką mocą czynną, aby uzyskać najwyższą możliwą sprawność wytwarzania energii elektrycznej z dostępnego potencjału hydroenergetycznego stopnia wodnego. W artykule opisano sposób optymalizacji przykładowej wieloblokowej elektrowni wodnej z wykorzystaniem różnych kryteriów, tj. kryterium sprawnościowego czy też przychodowego. Szczególną uwagę poświęcono zagadnieniu maksymalizacji sprawności wytwarzania gwarantującej maksymalne wykorzystanie dopływu i spadu dostępnego na stopniu przy narzuconych ograniczeniach wynikających z aktualnych uwarunkowań.

4

Renewable energy sources

72%

Mazurek B.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2003

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tom Vol. 39, nr 14

5-8

EN

Burning of coal in energy production causes a considerable degradation of natural environment, hence a tendency occurs to move over to less harmful energy sources - gas, crude oil and biomass. Renewable clean energy sources, such as water power, wind and solar energy gain on importance, and their share in overall energy balance must constantly increase. A new philosophy of the development of power industry is represented by the so called distributed (decentralized) power industry, consisting of a number of small power plants localized near and user. In the nearest future an urgent need will emerge for mobile power units with several to some dozen of megawatts output, mounted on tracks. These units will be used in case of disasters and failures of power nets.

5

Profitability of technologies using renewable sources of energy

58%

Michalak J.

Poznan University of Technology Academic Journals. Electrical Engineering

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2011

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tom No. 66

33--37

EN

The article presents the results of analysis of profitability of technologies using renewable sources of energy based on the example of wind and water power. The evaluation of economic profitability is based on two methods: net present value NPV and internal rate of return IRR. To conduct the abovementioned analysis a cash flow account has been used, including discount accounting principles. Profitability of technologies using renewable sources of energy has been conducted on the example of two objects: wind and water-power station.

6

Problemy gospodarczego wykorzystania dolnej Wisły

58%

Szymkiewicz R.

Czasopismo Inżynierii Lądowej, Środowiska i Architektury / Journal of Civil Engineering, Environment and Architecture

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2017

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tom z. 64, nr 3/I

141--151

PL

W pracy omówiono historię i aktualny stan zagospodarowania dolnej Wisły oraz najistotniejsze argumenty na rzecz gospodarczego wykorzystania jej potencjału. Wskazano, że najlepszym sposobem kompleksowego i integralnego rozwiązania problemów związanych z zagrożeniem niesionym przez dolną Wisłę i wykorzystaniem istniejących możliwości jest powrót do idei budowy kaskady stopni wodnych. Takie podejście umożliwi kompleksowe rozwiązanie problemów zagrożenia powodzią, produkcji energii, transportu wodnego, zaopatrzenia w wodę, retencji wód opadowych oraz sportu i rekreacji. Dla porównania przedstawiono stan rozwoju infrastruktury hydrotechnicznej w Europie i na świecie.

EN

In the paper the history and current situation dealing with the possibilities of making use of the lower Vistula River potential are presented and discussed. Taking into account the hydrological characteristics and the remarkable various possibilities represented by the Vistula River, it is shown that building of a cascade of reservoirs could be probably the best solution. This investment will make possible to solve simultaneously such problems as production of hydro-energy, water transport, flood protection, supplying of water for agriculture and industry, development of sports and recreation, increasing of stored water capacity etc. Application of the modern solutions and technologies should limit negative impact of the hydraulic structures on the natural environment of the Vistula valley. For comparison similar projects carried out in many other countries in the past and currently realized are also presented.