Temat: low efficiency - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Various designs of the two-stroke engine heads with the valve flushed system
Autorzy:: Łoza, Ł.
Kaźmierczak, A.
Borkowska, J.
Skorupa, P.
Krakowian, K.
Cienciała, M.
Powiązania:: https://bibliotekanauki.pl/articles/242546.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: engine
two-stroke
internal combustion
valve flushed system
piston-controlled cam
high petrol consumption
oil in the petrol
toxic by-products
loud noise
uneven running
low efficiency
Opis:: The two-stroke engines have never acquired the popularity of the four-stroke engines due to their inherent performance limitations. The tasks of many engineering teams were to find the basic causes, which resulted in the inferior performance of these engines. Today’s task is to build a two-stroke engine whose performance could match that of a four-stroke engine in areas of common use. The most typical performance problems of a two-stroke engine are high petrol consumption caused by low efficiency, toxic by-products of combustion being emitted into the atmosphere (caused by oil present in the petrol), and uneven and loud engine noise. The greatest challenge is to achieve a good chamber purge during one stroke in which the fresh fuel mixture flows through the piston-controlled inlet port while at the same time the fumes are being exhausted through the outlet port. This in contrast with the four-stroke engines where the intake and exhaust are each done with two separate strokes. From the energy point of view, the two-stroke engine is not efficient because a certain amount of fresh fuel is being wasted in the exhaust fumes. We propose to replace the piston-controlled cam with the valve-flushed system, which will cause the combustion process to become more efficient. The purpose of this paper is to present various designs of the engine heads and analyse their performance. The goal of this proposal is to choose the best combination of these engine heads in order to achieve the optimum overall engine performance.
Źródło:: Journal of KONES; 2015, 22, 4; 187-190
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Efficiency of the constant interaction force vibroisolation (WoSSO)
Autorzy:: Dobry, M. W.
Powiązania:: https://bibliotekanauki.pl/articles/279381.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: low-frequency passive vibroisolation
efficiency of force vibroisolation
Opis:: In this paper, the force efficiency of the WoSSO vibroisolation in reducing forces transferred into the base by machines and the equipment working at low operating frequencies has been discussed. To assess that efficiency, a strongly non-linear mathematical model using Lagrange equations of the second kind has been developed. That model takes into account the specific design of the vibroisolator. The mathematical model has been solved using s digital simulation method, by developing a special computer program in the MATLAB/simulink environment. The efficiency of the force vibroisolation has been determined for a specific application of the WoSSO vibroisolator. The calculated force vibroisolation efficiency exceeds 32.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 4; 1083-1091
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The Modal Low Frequency Noise of an Elastically Supported Circular Plate
Autorzy:: Rdzanek, W. P.
Rdzanek, W. J.
Engel, Z.
Szemela, K.
Powiązania:: https://bibliotekanauki.pl/articles/89877.pdf
Data publikacji:: 2007
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: low frequency noise
radiation efficiency
circular plate
hatchway
Opis:: The modal low frequency noise generated by a vibrating elastically supported circular plate embedded into a flat infinite baffle has been examined. The main aim of this study is the analysis of the radiation efficiency. Low frequency approximated formulas have been presented. They are valid for all the limiting boundary conditions of the plate with its edge clamped, guided, simply supported or free as well as for all the intermediate axisymmetric boundary configurations. The formulas are expressed in the elementary form, useful for numerical computations. They are a generalization of some earlier published results. First, they are valid for axisymmetric and asymmetric modes since both kinds of modes play an important role in the low frequency range. Second, a single formula for the radiation efficiency, valid for all the axisymmetric boundary configurations, has been proposed. A numerical example for the sound power radiation has been given for some hatchway covers mounted on a ship deck.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2007, 13, 2; 147-157
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: An influence of methane/hydrogen proportion in fuel blend on efficiency of conversion energy in SI engine
Autorzy:: Flekiewicz, M.
Kubica, G.
Powiązania:: https://bibliotekanauki.pl/articles/246510.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: methane/hydrogen blend
low-carbon fuel
total efficiency
SI engine
Opis:: The relations between methane/hydrogen proportions in fuel blend are presented in this paper. The research cycle carried out contains results of dynamometer chassis tests complemented with mathematical model calculations. An object of X16SZR engine installed in Opel Astra I was investigation. The engine has been equipped with additional CNG feeding system where fuel is being injected into intake manifold under low pressure. 8 fuel blends were tested with variable methane/hydrogen volume proportion (%): 100/0, 95/5, 90/10, 85/15, 80/20, 70/30, 60/40 and 50/50. The feeding and ignition systems were controlled by nominal drivers. In every measuring series engine was tested in the following steady states: on idle, high speed without load and full power at discrete variable speed in range 1500…3500 rpm. The main aspect of the analysis was to identify the influence of hydrogen share on engine parameters such power, fuel consumption, in-cylinder pressure, temperature and exhaust gas composition. Very significant ecological fact possibility of CO2 emission reduction has been identified. Result of increasing content of hydrogen in fuel mixture is engine knocking. Analysis carried out on the basis of results allowed it to the point on methane/hydrogen proportion in fuel blend considering a total efficiency, emission and heat flux in parts of combustion chamber in engine.
Źródło:: Journal of KONES; 2012, 19, 3; 117-124
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Efektywność wznoszenia budynków niskoenergetycznych i termomodernizacji istniejących
Efficiency of raising low-energy buildings and thermomodernization of existing ones
Autorzy:: Sadowska, B.
Sarosiek, W.
Powiązania:: https://bibliotekanauki.pl/articles/209720.pdf
Data publikacji:: 2014
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:: termomodernizacja
budynki niskoenergetyczne
efektywność energetyczna
efektywność ekonomiczna
thermomodernization
low-energy buildings
energy efficiency
economic efficiency
Opis:: W artykule przedstawiono wskaźniki energetyczne budynków poddanych termomodernizacji oraz możliwe do osiągnięcia efekty ekonomiczne. Wskazano rozwiązania techniczne pozwalające na znaczne obniżenie potrzeb cieplnych projektowanych obiektów.
Energy indexes and economical results of thermomodernization of buildings are presented in this paper. Solutions and elements used in building for achieving low level of energy saving are specified.
Źródło:: Biuletyn Wojskowej Akademii Technicznej; 2014, 63, 1; 179-191
1234-5865
Pojawia się w:: Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Low temperature district heating using waste heat from biogas plant
Autorzy:: Cenian, A.
Noch, T.
Powiązania:: https://bibliotekanauki.pl/articles/1190191.pdf
Data publikacji:: 2019
Wydawca:: Gdańska Szkoła Wyższa
Tematy:: low-temperature district-heating network
biogas installation
co-generation
energy efficiency
Opis:: A biogas plant can be a source of waste-heat flows with different thermal parameters. Application of such flows in local, low-temperature district-heating networks is a very attractive option for highly efficient, energetically and economically, co-generation systems applying biogas as the primary energy source.
Źródło:: Eco-Energetics: technologies, environment, law and economy; 2019, 2; 19--28
2657-5922
2657-7674
Pojawia się w:: Eco-Energetics: technologies, environment, law and economy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Evaluation efficiency of low-power fans used in the means of transport
Autorzy:: Nygard, Adam
Bartoszewicz, Jarosław
Powiązania:: https://bibliotekanauki.pl/articles/2097474.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: fans
low-power fan
evaluation efficiency
fan efficiency
transport
wentylatory
wentylator małej mocy
ocena wydajności
wydajność wentylatora
Opis:: The article presents test results on low-power fans used in the means of transport. Fans evaluation was in the context of energy efficiency. Interest in scientific topics related to low-power fans has its source in the reports of the Chief Inspector of Environmental Protection on the state of the natural environment in Poland and European Union reports assessing our natural environment. The goal of the article is to compare experimental results with Minister of Economy Regulation of March 11th, 2014, which introduces changes in accordance to European Parliament and Council Directive 2009/125/WE, with regard to ecodesign requirements for fans driven by motors with an electric input power between 125 W and 500 kW.
Źródło:: Combustion Engines; 2020, 59, 4; 15--20
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The influence of high efficiency engines and hybrids on exhaust systems
Autorzy:: Weber, M.
Powiązania:: https://bibliotekanauki.pl/articles/133204.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: high efficiency engines
low exhaust temperature
NH3 sensor
low backpressure DPF
silnik o wysokiej wydajności
niska temperatura spalin
Opis:: Increased efficiency of the combustion process itself and low losses in the Engine, lead to lower temperatures in the exhaust line. Combined with the exhaust gas energy recovery as well as the hybridization of the drivetrain, this temperature decrease will require additional efforts for the exhaust gas aftertreatment in future. Current technologies like SCR with urea could only be used in future with additional heating elements or will need to change to different catalysts or gaseous Ammonia, to keep the current efficiency and conversion rates. Catalyst and filter elements with ultra-low backpressure creating additional new challenges for the correct and robust diagnostics of these aftertreatment components and all emission relevant parts and thresholds. New technologies are needed like the direct measurement of the DPF soot loading with radio frequencies or NH3 sensors to precisely control the ammonia slip for high conversion rates of SCR catalysts.
Źródło:: Combustion Engines; 2017, 56, 4; 207-210
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Rozważania nad możliwościami efektywnego zarządzania energią na przykładzie gminy Rozprza Część I: Geotermia niskotemperaturowa jako źródło ciepła i chłodu
Discussion on the possibilities of efficient energy management on the example of the Rozprza municipality Part I: low -temperature geothermal energy as a source of heat and cold
Autorzy:: Szulc, A.
Podlewska, E.
Tomaszewska, B.
Powiązania:: https://bibliotekanauki.pl/articles/950224.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:: geotermia niskotemperaturowa
efektywność energetyczna
gmina Rozprza
low-temperature geothermal
energy efficiency
Rozprza municipality
Opis:: Poprawa efektywności energetycznej jest jednym z priorytetów polskiej polityki energetycznej. Podejmowane w tym zakresie działania dążą do obniżenia zużycia energii pierwotnej, przyczyniając się jednocześnie do wzrostu bezpieczeństwa energetycznego państwa oraz redukcji zanieczyszczeń emitowanych do środowiska. W artykule, na przykładzie gminy Rozprza, przeanalizowano efektywne zarządzanie energią w chwili obecnej i na tej podstawie wskazano działania, mające poprawić jej efektywność energetyczną. Jedną z propozycji autorów było wykorzystanie geotermii niskotemperaturowej jako źródła ciepła i chłodu. Urządzenia do tego przeznaczone (pompy ciepła) są instalacjami wielofunkcyjnymi, które ze względu na możliwość wykorzystania ciepła zawartego w środowisku, mogą mieć szerokie zastosowanie na obszarze omawianej gminy. Dzięki wprowadzonym przez NFOŚiGW mechanizmom wsparcia (Program Prosument/Program Ryś), zarówno osoby fizyczne, przedsiębiorstwa, jak i jednostki samorządowe będą mogły z niego skorzystać.
Improving energy efficiency is one of the priorities of the Polish energy policy. Activities undertaken in this field seek to reduce primary energy consumption, while contributing to the growth of national energy security and the reduction of environmental pollution. The article contains the discussion on effective energy management in the Rozprza municipality. The analysis of the current situation allowed for the main objective to be set, and once it is achieved, it will contribute to energy efficiency improvement. One of the authors’ proposal was the use of low temperature geothermal energy as a source of heat and cold. Devices designed for this, such as heat pumps, are multifunctional installations where the ability of using the warm water contained in the environment can be widely implemented on the entire area of the municipality. Households, businesses and local governments will benefit from the funding line through the support systems introduced by National Fund for Environmental Protection and Water Management (Prosument and Ryś programs).
Źródło:: Technika Poszukiwań Geologicznych; 2016, R. 55, nr 2, 2; 79-82
0304-520X
Pojawia się w:: Technika Poszukiwań Geologicznych
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Some Issues Quantifying Low-carbon of an Achievement Energy and Industry
Autorzy:: Ziganshin, Malik G.
Powiązania:: https://bibliotekanauki.pl/articles/2069932.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: global pollutants
emission source
greenhouse gas
low-carbon achieve quantifying
energy efficiency
energy
industry
Opis:: In this work, for use as a unified tool within the framework of ISO 50001, a methodology for rating assessment of the processing of emissions with global pollutants is proposed, which was developed by the authors and recommended for use by state documents of the Republic of Tatarstan, Russia. It is distinguished by the absence of not transparences elements. As the initial data, the actual background concentrations (according to WMO data), the annual ceiling of greenhouse gas emissions and the maximum permissible emissions of toxic compounds, information on the characteristics of emission sources are taken for the enterprise, and as operational constants, the global warming potentials of greenhouse gases (GWP100) and officially approved values of maximum permissible concentrations of toxic compounds (MPC). The method is based on the equation (presented here at annotation in a simplified form), which gives a numerical indicator (rating) R of the efficiency of a production facility in terms of hazardous emissions into the atmosphere, taking into account greenhouse gases and energy costs arising from their removal. Currently, the technique is adapted to the energy sector; for wider adaptation to various industries, a low-carbon rating program has been drawn up for boiler houses, thermal power plants and industrial enterprises. It also meets the needs of understanding and predicting possible deviations of emission parameters from the standardized indicators. Therefore, it can serve as a tool within the framework of ISO 50001, providing objective control over the choice of means to ensure compliance with the requirements for harmful components emissions including greenhouse gases in the design and modernization of production facilities. The developed program is embedded for Russian enterprises in the shell of the ‘1C: Enterprise’ platform – a software product for automating accounting and management at enterprises. The program can also be used in the software shell of the automated accounting of the activities of a particular organization in a one or the other country.
Źródło:: Rocznik Ochrona Środowiska; 2021, 23; 446--457
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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