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Wyszukujesz frazę "energy, power" wg kryterium: Temat


Tytuł:
Graphical presentation of the power of energy losses and power developed in the elements of hydrostatic drive and control system. Part I. Rotational hydraulic motor speed series throttling control systems
Autorzy:
Paszota, Z.
Powiązania:
https://bibliotekanauki.pl/articles/259854.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive and control system
power of energy losses
energy efficiency
Opis:
Paper proposes and justifies a diagram of the direction of increase of power stream from the shaft or piston rod of a hydraulic motor to the pump shaft, power increasing as an effect of the imposed power of energy losses in the hydrostatic drive and control system elements. Graphical interpretation of the power of energy losses in the hydrostatic drive and control system elements and also of the power developed by those elements is presented. An individual system with the rotational hydraulic motor speed series throttling control fed by a constant capacity pump cooperating with an overflow valve in a constant pressure system p = cte . pn is analyzed and also an individual system with the rotational hydraulic motor speed series throttling control fed by a constant capacity pump cooperating with an overflow valve controlled in a variable pressure system: p = var, an individual system with the rotational hydraulic motor speed series throttling control fed by a variable capacity pump cooperating with a pressure regulator in a constant pressure system p = cte . pn and an individual system with the rotational hydraulic motor speed series throttling control fed by a variable capacity pump cooperating with the Load Sensing regulator in a variable pressure p = var system.
Źródło:
Polish Maritime Research; 2008, 3; 28-37
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of losses in a hydraulic motor based on the SWSB - 63 motor tests
Autorzy:
Maczyszyn, A.
Powiązania:
https://bibliotekanauki.pl/articles/259391.pdf
Data publikacji:
2010
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive and control
energy efficiency
power of energy losses
Opis:
In this paper are compared two models of energy losses: that suggested by Prof. Paszota, Z. in monograph “Energy losses in the hydraulic displacement motors – definitions and relations serving the evaluation of the efficiency of hydrostatic drive” [18] and that of Prof. Balawender, A. in “Energy analysis and methodology of testing of low-speed hydraulic motors” [1]. By using the data obtained from the tests of SWSB-63 hydraulic motors [2] the graphs which illustrate mechanical, volumetric and pressure losses in function of the parameters on which the losses directly depend [18 ], have been elaborated and showed in comparison with the description of such losses in function of the parameters assumed in [1]. The below presented text has been complemented in relation to that published in the monograph [4] and read during the scientific technical conference „Cylinder 2010” organized by the Mining Engineering Centre „Komag”, Gliwice, and held on 20÷22 September 2010 in Rytro, Poland.
Źródło:
Polish Maritime Research; 2010, 4; 46-53
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Graphical presentation of the power of energy losses and power developed in the elements of hydrostatic drive and control system. Part II. Rotational hydraulic motor speed parallel throttling control and volumetric control systems
Autorzy:
Paszota, Z.
Powiązania:
https://bibliotekanauki.pl/articles/258538.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive and control system
power of energy losses
energy efficiency
Opis:
Paper presents graphical interpretation of the power of energy losses in the hydrostatic drive and control system elements and also of the power developed by those elements. An individual system fed by a constant capacity pump, where rotational hydraulic motor speed control is effected by a parallel throttling control system, is analyzed and also a system with the rotational hydraulic motor speed volumetric control by a variable capacity pump, an individual system with a rotational hydraulic motor volumetric speed control by means of a simultaneous change of the pump capacity per one revolution and change of the motor capacity per one revolution, the system operating at the constant pressure in the pump discharge conduit equal to the nominal pressure of the system: pP2 = pn and central system (with situated in parallel and simultaneously operating motors) with volumetric speed control of each rotational hydraulic motor by a motor secondary circuit assembly, the system fed by a pump with variable capacity per one shaft revolution fitted with pressure regulator pP2 = pn.
Źródło:
Polish Maritime Research; 2008, 4; 21-29
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of sum of power losses as a way for determining the ki coefficients of energy losses in hydraulic motor
Autorzy:
Maczyszyn, A.
Powiązania:
https://bibliotekanauki.pl/articles/259421.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive
power of energy losses
hydraulic rotary motor
Opis:
This paper shows application of the method of sum of power losses to determining energy losses which occur in hydraulic rotary motor in situation when not all laboratory data are at one’s disposal or when no use is made of data contained in catalogue charts. The method makes it possible to determine the coefficients, ki, of energy losses occurring in the motor. The method of sum of power losses is based on the approach proposed by Z. Paszota, in the papers [3 ÷ 9]. It consists in adding power flow of energy losses occurring in the motor to power flow output and comparing the sum to the power flow input. Application of the method is exemplified by using a A6VM hydraulic motor.
Źródło:
Polish Maritime Research; 2016, 2; 57-67
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation method and mathematical model of pressure losses in hydraulic rotary motor
Autorzy:
Maczyszyn, A.
Powiązania:
https://bibliotekanauki.pl/articles/259344.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive
power values of energy losses
hydraulic rotary motor
pressure losses
pressure efficiency
Opis:
This paper presents a way of determining the coefficient k8 of the pressure losses ΔpMp (flow drag) in internal ducts of SWSB-63 hydraulic motor. The coefficient is determined at a flow rate equal to the theoretical capacity QPt of the pump feeding the motor , the losses are related to the nominal pressure pn in the hydraulic system. The investigations followed a model of energy performance of hydraulic rotary motor, proposed by Z. Paszota.
Źródło:
Polish Maritime Research; 2018, 1; 93-98
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small wood waste fired combined heat and power plant. Possible use of wood biomass for the generation of electric and heat energy as an alternative to fossil fuels
Autorzy:
Dzida, M.
Powiązania:
https://bibliotekanauki.pl/articles/2073647.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
renewable energy sources
wood biomass
power plant system
Opis:
This article discusses the possibility of burning wood biomass instead of fossil fuels in boilers. It describes the properties of wood biomass, including the variation of its calorific value depending on the moisture content of wood. The article proposes several variants of a combined heat and power plant (CHP) system burning wood biomass for the generation of electric and heat energy, using the energy contained in exhaust gases for drying wood biomass.
Źródło:
Journal of Polish CIMEEAC; 2015, 10, 1; 53--61
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing power supply safety in the aspect of supporting the renewable energy sources by conventional and virtual power stores
Autorzy:
Jakowski, D.
Dzida, M.
Powiązania:
https://bibliotekanauki.pl/articles/259988.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
OZE
power market
energy stores
DSR
power supply safety
electric power system
mangement of electric power demand
Opis:
This paper presents characteristics and purposefulness of supporting the renewable energy sources (OZE) by means of energy stores. The main emphasis was placed on analysis of virtual energy stores available for implementation in Polish economy conditions. A role which management of Demand Side Response (DSR) may play in balancing Polish electric power system, is discussed. Implementation of such solutions together with conventional energy stores may significantly influence power supply safety by assuring continuity of electric power supply at an acceptable price. Involvement of electric power consumers ( DSR ) should be one of the basic solutions for power markets in Poland and Europe.
Źródło:
Polish Maritime Research; 2018, S 1; 189-197
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal configurations of wave energy converter arrays with a floating body
Autorzy:
Zhang, W.
Liu, H.
Zhang, X.
Zhang, L.
Ashraf, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/260084.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
wave energy
cylinder array
power take-off
hydrodynamic analysis
Opis:
An array of floating point-absorbing wave energy converters (WECs) is usually employed for extracting efficiently ocean wave energy. For deep water environment, it is more feasible and convenient to connect the absorbers array with a floating body, such as a semi-submersible bottom-moored disk, whose function is to act as the virtual seabed. In the present work, an array of identical floating symmetrically distributed cylinders in a coaxial moored disk as a wave energy device is proposed The power take-off (PTO) system in the wave energy device is assumed to be composed of a linear/nonlinear damper activated by the buoys heaving motion. Hydrodynamic analysis of the examined floating system is implemented in frequency domain. Hydrodynamic interferences between the oscillating bodies are accounted for in the corresponding coupled equations. The array layouts under the constraint of the disk, incidence wave directions, separating distance between the absorbers and the PTO damping are considered to optimize this kind of WECs. Numerical results with regular waves are presented and discussed for the axisymmetric system utilizing heave mode with these interaction factors, in terms of a specific numbers of cylinders and expected power production.
Źródło:
Polish Maritime Research; 2016, S 1; 71-77
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power performance of the combined monopile wind turbine and floating buoy with heave-type wave energy converter
Autorzy:
Homayoun, Esmaeil
Ghassemi, Hassan
Ghafari, Hamidreza
Powiązania:
https://bibliotekanauki.pl/articles/260485.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
combined renewable energy
monopile wind turbine
heaving buoy
power take of
Opis:
This study deals with a new concept of near-shore combined renewable energy system which integrates a monopile wind turbine and a floating buoy with heave-type wave energy converter( WEC). Wave energy is absorbed by power-take-off (PTO) systems. Four different shapes of buoy model are selected for this study. Power performance in regular waves is calculated by using boundary element method in ANSYS-AQWA software in both time and frequency domains. This software is based on three-dimensional radiation/diffraction theory and Morison’s equation using mixture of panels and Morison elements for determining hydrodynamic loads. For validation of the approach the numerical results of the main dynamic responses of WEC in regular wave are compared with the available experimental data. The effects of the heaving buoy geometry on the main dynamic responses such as added mass, damping coefficient, heave motion, PTO damping force and mean power of various model shapes of WEC in regular waves with different periods, are compared and discussed. Comparison of the results showed that using WECs with a curvature inward in the bottom would absorb more energy from sea waves.
Źródło:
Polish Maritime Research; 2019, 3; 107-114
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid energy system for a classic ship power plant
Autorzy:
Liberacki, R.
Powiązania:
https://bibliotekanauki.pl/articles/2073574.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
energy
hybrid system
ship
power plant
energia
system hybrydowy
statek
elektrownia
Opis:
The article presents a brief overview of hybrid energy systems used on ships. The area of their application is outlined. The benefits of using such systems are also indicated. Then, the classic ship power plant is defined. The most important part of the article is a proposal how to modify a classic engine room by using a hybrid energy system. The idea is: to accumulate a part of electricity in areas where it is allowed to burn fuel with high sulfur content (cheaper). Then, use the accumulated energy in areas where it is allowed to burn only fuel with low sulfur content (more expensive). The implementation of such an idea requires the use of a battery pack on the ship. At the end of the article, the initial estimation of savings on fuel costs is made.
Źródło:
Journal of Polish CIMEEAC; 2017, 12, 1; 59--64
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Destructiveness of profits and outlays associated with operation of offshore wind electric power plant. PART 1 : Identification of a model and its components
Autorzy:
Tomporowski, A.
Flizikowski, J.
Kruszelnicka, W.
Piasecka, I.
Kasner, R.
Mroziński, A.
Kovalyshyn, S.
Powiązania:
https://bibliotekanauki.pl/articles/258704.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
offshore wind electric power plants
energy
economic and ecological effectiveness
destructiveness
Opis:
This paper describes identification and components of destructiveness of energy, economic and ecologic profits and outlays during life cycle of offshore wind electric power plants as well as the most useful models for their design, assembly and use. There are characterized technical conditions ( concepts, structures, processes) indispensable for increasing profits and/or decreasing energy, economic and ecological outlays on their operation as well as development prospects for global, European and domestic markets of offshore wind electric power industry. A preliminary analysis was performed for an impact of operators, processed objects, living and artificial environmental objects of a 2MW wind electric power plant on possible increase of profits and decrease of outlays as a result of compensation of destructiveness of the system, environment and man.
Źródło:
Polish Maritime Research; 2018, 2; 132-139
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of energy potential of three ways of configuration of a condenser power plant thermal cycle
Autorzy:
Chmielniak, T.
Krzyślak, P.
Powiązania:
https://bibliotekanauki.pl/articles/258540.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Comparative analysis of energy
condenser
power plant
thermal cycle
new regeneration
separation preheater
Opis:
A theoretical, comparative analysis of three configuration ways of a condenser power plant thermal cycle is shown in the work. A new regeneration & separation preheater and its application in a thermal cycle is presented. Results obtained allow to compare all three analysed configurations efficiencies.
Źródło:
Polish Maritime Research; 2008, 4; 30-36
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of energy use and elimination of CO2 emissions in the life cycle of an offshore wind power plant farm
Autorzy:
Tomporowski, A.
Flizikowski, J.
Opielak, M.
Kasner, R.
Kruszelnicka, W.
Powiązania:
https://bibliotekanauki.pl/articles/258566.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
energy efficiency
use of machines
offshore wind power plant farms
CO2 emissions
Opis:
Power stations in marine locations cause multi-faceted impact on the environment, man and the economy. There are not many studies devoted to modeling energy benefits for CO2 emissions. The paper presents the issues of assessing the efficiency of offshore wind farms, defined as the ratio of benefits to life cycle inputs. The scientific goal was to develop a mathematical model for efficiency in the design, manufacture, use and management of offshore wind power. The papers practical purpose is the experimental designation of the impact of selected post-use management methods, time of use and maritime location, i.e. average annual productivity of wind power plants on the efficiency of energy benefits from greenhouse gas emissions. The mathematical model of the integrated cost-benefit ratio has been developed for energy use assessment, taking into account the benefits generated by electricity production and the life-cycle CO2 emissions based on the LCA analysis using the CML method. Mathematical model validation was performed by determining the value of the indicator for an existing 2 MW offshore wind farm and comparatively for fossil fuel production: lignite, stone, fuel oil and natural gas. Analytical and research work carried out showed that the higher the efficiency index, the higher the value of the indicator. It has been shown that the location of the power station at sea produces more favorable CO2 elimination rates, due to higher productivity compared to in-land wind power plants. A more favorable form of post-consumer management for CO2 has been determined as recycling. It was found that for electricity generated from offshore wind farms, the value of the energy efficiency benefit from CO2 emissions is higher than for fossil fuel energy production.
Źródło:
Polish Maritime Research; 2017, 4; 93-101
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Legal aspects of electric energy generation in a floating power plant
Autorzy:
Olszewski, W.
Dzida, M.
Powiązania:
https://bibliotekanauki.pl/articles/2073637.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
electric energy
floating power plant
environmental pollution
energia elektryczna
pływająca elektrownia
zanieczyszczenie środowiska
Opis:
This paper discusses the characteristics of pollution and legal regulations governing investment projects affecting the environment. It describes a combined system of a compression ignition engine and a steam turbine, whose aim, when placed on a floating platform, is to produce electric energy in a so-called distributed generation system. Such a system involves a reciprocating internal combustion engine and a connected steam turbine system that uses the energy contained in the exhaust gas of the combustion engine. The paper ends with synthetic conclusions.
Źródło:
Journal of Polish CIMEEAC; 2016, 11, 1; 151--156
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental research of the impact of ship’s rolling on the performance of PV panels
Autorzy:
Zeńczak, Wojciech
Zapałowicz, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/32897005.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship power system
PV system
ship’s energy efficiency design index
ship rolling
Opis:
The aim of the International Maritime Organization (IMO) to reduce by half the amount of greenhouse gases emitted by marine ships by 2050, and its vision of the fastest total decarbonisation in the maritime shipping industry within the present century, calls for implementation with various means of decarbonisation. The IMO approaches the process of decarbonisation in two phases. Firstly, short-term, compact projects are to be considered, next, more complex, medium- and long-term solutions should be aimed at. The preferred arrangements to be applied are photovoltaic systems. Their performance depends to a high degree on the solar incidence angle. In the case of a ship swinging as a result of its course in relation to the wave and incidence direction, the incidence angle undergoes significant periodic changes with a significant effect on the power generated by the PV panels. As a result, the total amount of energy produced by the PV panels diminishes. The paper presents experimental research results obtained on the stand that allowed the investigation of PV panels in simulated marine conditions. Two characteristic positions of a PV panel’s rotation axis in relation to the solar rays’ incidence direction were investigated. It was proved for both variants that the rolling period and solar incidence angle affected the power generated by the PV panel.
Źródło:
Polish Maritime Research; 2022, 4; 132-144
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł

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