Wyniki wyszukiwania - BazTech

1

Reduction of electric locomotive's energy consumption by scalable tractive power control

Andryushchenko A., Kolpahchyan P., Zarifyan A.

Transport Problems

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2018

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T. 13, z. 2

103--110

EN

At the beginning of the paper, the analysis of energy efficiency indicators for freight electric locomotive with asynchronous traction drive feeding from AC network under various operating conditions including when working with trains of various masses is made. The movement on different railway sections is considered. The graphs of locomotive’s speed, traction force, consumed power, and power for the traction obtained by on-board recorder are shown. In addition, the dependence of the locomotive's energy efficiency from the degree of using of its available traction capacity has been experimentally obtained, the greater is the using of the locomotive’s capacity, the greater will be its efficiency. On the basis of the performed analysis of energy efficiency indicators for various operating conditions, the proposals for their improvement are formulated. The algorithm ensuring the stabilization of the instantaneous value of efficiency at partial load to its nominal level at full load is presented. This algorithm is the implementation of Scalable Power Control Technology with respect to the problem of reducing electricity consumption for electric locomotive traction. The direct the experimental confirmation of energy consumption reduction for freight electric locomotive due to the application of our proposals (under the same operating conditions of the locomotive) is obtained.

2

Radial fan controlled with impeller movable blades – CFD investigations

Jóźwik K., Papierski A., Sobczak K., Obidowski D., Kryłłowicz W., Marciniak E., Wróbel G., Marciniak A., Wróblewski P., Kobierska A., Frącczak Ł., Podsędkowski L.

Transactions of the Institute of Fluid-Flow Machinery

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2016

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nr 131

17--40

EN

Modern classical power generation systems, based on power plants in Poland, where coal (hard bituminous coal or lignite) is the primary energy source, operate under variable loading conditions. Thus, all machines working in the technological system of the power generation unit are required to be adapted to variable loading, and, consequently, to operate beyond the design point of their performance characteristics. High efficiency of the process requires the efficiency of individual devices to be high, beyond the design point, as well. For both air and exhaust gases fans, an effective control system is needed to attain a high level of efficiency. As a result of cooperation between two institutes from the Faculty of Mechanical Engineering, Lodz University of Technology, and the Vibroson company, a new design of the radial fan with impeller movable blades, which allows for controlling the device operation within a wide range, has been developed. This new design and determination the performance characteristics for two geometrical variants of blades with computational fluid dynamics methods are presented. The obtained results have been compared to the results of the measurements of fan performance curves conducted on the test stand.

3

Logistical Aspects of Energy Conversion Efficiency in Marine Steam Power Plants in Off-Design Conditions

Kowalczyk T., Badur J.

Logistyka

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2014

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nr 4

4510--4517, CD6

EN

The paper presents logistical aspects of energy conversion efficiency in off-design conditions. The main part of the article is based on results of thermodynamic calculation for large propulsion steam turbine under partial loads. Calculations are made on extended mathematical model of two proposed steam turbine thermodynamic cycles using Stodola’s cone law. The conclusion based on calculation results contains importance of off-design calculations on energy conversion efficiency in aspects of transport and logistics profitability and sustainable development postulates.

PL

W artykule przedstawiono wyniki analizy sprawności konwersji energii w turbinowych siłowniach parowych przy obciążeniach częściowych pod kątem wpływu na sektor transportu i logistyki. W pracy opisano fragment modelu matematycznego pozwalającego wyznaczyć parametry obiegu turbiny parowej przy obciążeniach częściowych. Obliczenia zostały przeprowadzone dla dwóch proponowanych obiegów termodynamicznych używając m.in. równania przelotności turbiny Stodoli. Wnioski oparte na wynikach obliczeń ukazują znaczenie zagadnienia sprawności konwersji energii w transporcie morskim w odniesieniu do rentowności i idei zrównoważonej konwersji energii.

4

The charge air energy losses of a partially loaded low speed engine

Tuński T.

Problemy Eksploatacji

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2008

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nr 4

231-237

EN

The structure of the low speed ship engines energy balance has changed during the last 30 years of engine development. The significant rise of the charge air waste heat is noticeable. The presented article describes changes of this kind of energy loss for partially loaded low speed engines. Calculations are based on the mathematical analysis of engine data and parameters recorded during ship operation under real conditions.

PL

Struktura bilansu energetycznego okrętowych wolnoobrotowych silników spalinowych uległa zmianie wraz z rozwojem w ciągu ostatnich 30 lat. Zauważalny jest znaczący wzrost strat energii cieplnej zawartej w powietrzu doładowującym. Prezentowany artykuł przedstawia zmiany tego typu rodzaju strat dla częściowo obciążonych silników wolnoobrotowych. Obliczenia zostały oparte na analizach danych silników oraz na zarejestrowanych parametrach podczas eksploatacji statku w warunkach rzeczywistych.