Temat: total efficiency - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Total efficiency of adjustable compression ratio SI engine
Autorzy:: Sendyka, B.
Kula, K.
Kudzia, S.
Soczowka, J.
Tematy:: SI engine
compression ratio
combustion engines
total efficiency; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/242772.pdf Link otwiera się w nowym oknie
Opis:: The following paper includes adjustable ratio spark ignition engine's total efficiency analysis. Main modification of the engine is mounting of crankshaft on eccentric mechanism. Paper presents schemes of eccentric mechanism implemented in developed engine as well as adjustable compression ratio control system's block diagram. Propulsion from stepper motor is transmitted through self-locking worm gear. Value of compression ratio varies from 9.5 to 14. The main input signal for electronic control system is coming from knock-sensor mounted on the engine. If control system doesn't receive that signal it levels up compression ratio. As soon as signal appears ratio mentioned above is reduced by a value 0.05. During the investigation rotational speed of the engine was limited to nterval 1800-4000 [rpm] and throttle was partially closed. Relative increase of Suzuki engine's total efficiency presented in this paper surpasses 30 per cent. The outcome of investigation presents engine with variable compression ratio as a good prospect for the future. Constant adjustment of compression ratio with use of electronical control system allows significant improvement of total efficiency and consequently reducing fuel consumption.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: An influence of methane/hydrogen proportion in fuel blend on efficiency of conversion energy in SI engine
Autorzy:: Flekiewicz, M.
Kubica, G.
Tematy:: methane/hydrogen blend
low-carbon fuel
total efficiency
SI engine; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246510.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Test bed studies of an engine with combustion initiation from ignition dose of fuel
Autorzy:: Sendyka, B.
Noga, M.
Tematy:: two-cycle engine
compression ignition
spark ignition
total efficiency of engine; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245825.pdf Link otwiera się w nowym oknie
Opis:: Results of test bed studies of combustion engine with work possibility with application of spark ignition and combustion from ignition dose injected directly into the combustion chamber were described in this article. In engine working according to the patent solution of Prof. B. Sendyka, during start and work at low rotational speed and low load a system realizing spark ignition of homogenous mixture formed in classical way in the intake manifold is active. For higher rotational speeds and heavy load the ignition system is switched off whereas, injectors of ignition dose injecting fuel by the end of the compression stroke directly into the working space of the engine are activated. The fuel dose injected into the combustion chamber undergoes auto-ignition and in this way the combustion process in the whole volume of the homogenous combustion charge accumulated in the cylinder is initiated. The mass of ignition dose of fuel constitutes about 5 – 10% of the whole fuel mass per working cycle what differs decisively the presented solution from other known engines working according to similar principles. Application of two combustion system in four stroke combustion engine aims at combining the advantages of spark ignition a compression ignition engines. The engine is characterized by easy starting and during work at higher rotational speed and higher load in the mode of ignition from pilot dose exploitation efficiency of energy contained in fuel is higher than for spark ignition engine, this finds direct reflection in increase in total efficiency by over 9% as related to the base value.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: New design of the five-stroke SI engine
Autorzy:: Noga, M.
Sendyka, B.
Tematy:: five-stroke engine
spark ignition
additional expansion
increase of total efficiency; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245394.pdf Link otwiera się w nowym oknie
Opis:: The paper describes design of the five-stroke engine developed in the Chair of Combustion Engines at Cracow University of Technology. The idea of five-stroke engine, in which the expansion ratio is significantly greater than the compression ratio has been presented by the Belgian engineer Gerhard Schmitz. The prototype of such an engine was made by Ilmor Engineering. Engine developers have released results of preliminary research, but there is no detailed information on the toxic exhaust emissions. For this reason, at Cracow University of Technology the research was undertaken to determine the impact of implementing the five-stroke cycle into the engine with spark ignition to reduce toxic emissions and increase total efficiency. To achieve this goal, the test engine was built, which is based on a concept similar to the idea of Gerhard Schmitz, with the difference that it has not been designed from the ground up, and it is based on an existing four-cylinder four-stroke engine. In comparison with the original solution, the engine built in Cracow has a completely different design of timing system, four valves per cylinder and petrol direct injection. This paper presents a detailed description of the engine design and the results of its preliminary research. The results of the tests of the five-stroke engine confirm an increase of specific torque and power (related to unit of engine displacement) and improve of total efficiency within a certain range of the engine map.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The description of the total efficiency of 2SZ-FE engine with the variable valve timing
Autorzy:: Sendyka, B.
Sochan, A.
Noga, M.
Rodak, Ł.
Tematy:: silnik spalinowy
obieg Atkinsona
spalanie
sprawność ogólna
silnik
combustion engine
Atkinson cycle
combustion
total efficiency
engine; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/243046.pdf Link otwiera się w nowym oknie
Opis:: In this paper there were conducted tests of the combustion engine with the Atkinson cycle and with applying variable valve timing. There was described the 2SZ-FE engine characteristics and assigned the total efficiency before and after application of the phase shifter. Secondly, there was determined the thermal efficiency of the single engine work cycles and also engine 's total efficiency by using the optoelectronic pressure sensor and mathematical programme. After that, it was available to present the range of the variable valve timing. Atkinson system, phases of 2SZ-FE engine timing gear, the total efficiency distribution during 75 % of throttle opening and when inlet valves are open, the total efficiency increase during 75 % of throttle opening, the total efficiency distribution during 50 % of throttle opening and when suction valves are open, the total efficiency increase during 50 % of throttle opening, the total efficiency distribution during 25 % of throttle opening and when inlet valves are opened, the total efficiency increase during 25 % of throttle opening, the total efficiency distribution with application of phases shifter are presented in the paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Assumptions of a method estimation for adjustments charakteristics of an engine and turbo-compressor set in sequential turbocharging
Założenia metody oceny dopasowania charakterystyk silnika i zespołu turbosprężarkowego w doładowaniu zakresowym
Autorzy:: Danilecki, K.
Tematy:: doładowanie zakresowe
całkowita sprawność układu doładowującego
sequential turbocharging
optimum power distribution of turbochargers
total efficiency of a supercharging device; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245757.pdf Link otwiera się w nowym oknie
Opis:: The paper presents fundamentals characterising the operation of turbochargers and the dependencies essential for the calculation (the use of balance equations of a turbocharger this purpose ) of the total efficiency of a compressor set with respect to the power balance of the respective devices of aturbine. For the assumed conditions of the engine operation - an optimum power distribution has been carried out on the basis ofa theoretical analysis as far as the total efficiency is concerned in the compressor set and in theturbine set of a supercharging device. The required pressure drops in the turbine, essential to ensure the power in the compressor have been carried out with respect to the efficiency of each device. The paper pays attention on connected problems with the choice of the suitable design system range supercharging and secures favourable conditions its cooperation with the engine. This is especially important in phase switches over modes of operation between turbo-compressors and it has principle importance for the maintenance of the continuity of engine characteristics. In particular the entire efficiency of system supercharging was appointed, the required pressure of exhaust gases, flows and profiles of intake-boxes of every turbine were calculated.
W pracy przedstawione zostały zasadnicze wielkości charakteryzujące pracę turbosprężarek oraz zależności niezbędne do obliczenia całkowitej sprawności zespołu sprężarkowego przy uwzględnieniu równowagi mocy z odpowiednimi urządzeniami zespołu turbinowego, wykorzystując do tego celu równania bilansowe turbosprężarki. Następnie, dla założonych warunków pracy silnika, na drodze analizy teoretycznej, dokonano optymalnego pod względem sprawności całkowitej podziału mocy w zespołach sprężarkowych oraz turbinowych urządzenia doładowującego. Określone zostały wymagane spadki ciśnienia po stronie turbin konieczne do zapewnienia mocy potrzebnej po stronie sprężarek przy uwzględnieniu sprawności każdego urządzenia. W artykule zwrócono uwagę na problemy związane z wyborem odpowiedniej konstrukcji układu doładowania zakresowego i zapewnieniem korzystnych warunków jego współpracy z silnikiem. To jest szczególnie ważne w fazie przełączania trybów pracy pomiędzy turbosprężarkami i to ma zasadnicze znaczenie dla zachowania ciągłości charakterystyki silnika. W szczególności całkowita sprawność układu doładowującego wyznaczona została, wymagane ciśnienie spalin, wydatki oraz przekroje skrzyń wlotowych każdej turbiny były obliczone.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Wielkość ekonomiczna gospodarstw rolnych w Polsce a ich efektywność w latach 2004-2018
Economic size of farms in Poland and their efficiency in 2004-2018
Autorzy:: Sass, Roman
Tematy:: potencjał wytwórczy gospodarstw
efektywność całkowita gospodarstw
produktywność czynników produkcji
production potential of farms
productivity of production factors
total farm efficiency; Pokaż więcej
Wydawca:: Centrum Doradztwa Rolniczego w Brwinowie. Oddział w Poznaniu
Powiązania:: https://bibliotekanauki.pl/articles/2047277.pdf Link otwiera się w nowym oknie
Opis:: Celem pracy jest analiza produktywności ziemi, pracy i majątku trwałego oraz efektywności całkowitej w ujęciu dynamicznym według wielkości ekonomicznej gospodarstw rolnych w Polsce. Podstawowym źródłem informacji były wyniki standardowe uzyskane przez gospodarstwa rolne uczestniczące w Polskim FADN (ang. Farm Accountancy Data Network). W pierwszym etapie badań analizowano produktywność czynników wytwórczych, wykorzystując cząstkowe wskaźniki produktywności. W celu ustalenia łącznego wpływu czynników wytwórczych na produkcję, posłużono się nieparametryczną metodą DEA (Data Envelopment Analysis). Efektywność całkowitą gospodarstw analizowano w ujęciu dynamicznym, wykorzystując do tego celu indeks produktywności Malmquista (TFP – Total Factor Productivity). Z badań wynika, że największą produktywność ziemi, pracy i majątku trwałego jak i efektywność całkowitą (TFP) osiągnęły gospodarstwa duże i bardzo duże, zatem istotnym warunkiem budowania i utrzymania konkurencyjności gospodarstw jest poprawa struktury agrarnej polskiego rolnictwa.
The aim of the study is to analyse the productivity of land, labor and fixed assets as well as total efficiency in dynamic terms according to the economic size of farms in Poland. The basic source of information were standard results obtained by farms participating in the Polish FADN (ang. Farm Accountancy Data Network). In the first stage of the research, the productivity of factors of production was analysed with the use of partial indicators of land, labor and fixed assets productivity. In order to determine the total impact of production factors on production, the non-parametric DEA method (Data Envelopment Analysis) was used. The total efficiency of farms was analysed in dynamic terms, using the Malmquist productivity index (TFP - Total Factor Productivity). The research shows that the highest productivity of land, labor and fixed assets as well as total efficiency (TFP) was achieved by large and very large farms, therefore an important condition for building and maintaining the competitiveness of farms is the improvement of the agrarian structure of Polish agriculture.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Analiza porównawcza mocy i sprawności układu kogeneracyjnego turbiny gazowej i parowej
The Comparative Study on Selected Operation Parameters of a Combined Cycle Plant
Autorzy:: Chinhenha, A.
Mindykowski, J.
Tematy:: obieg gazowo-parowy
moc elektryczna i sprawność całkowita obiegu
model analityczny
badania symulacyjne
analiza parametrów
combined cycle plant
electric power and total efficiency
analytical model
simulation research
parameters analysis; Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
Powiązania:: https://bibliotekanauki.pl/articles/947654.pdf Link otwiera się w nowym oknie
Opis:: Przedmiotem pracy są badania symulacyjne i analiza wybranych parametrów siłowni pracującej w obiegu gazowo-parowym. Celem pracy jest opracowanie metodyki oceny mocy i sprawności siłowni z turbinami pracującymi w obiegu gazowo-parowym z wykorzystaniem autorskiego modelu analitycznego rozważanej instalacji. Uzyskane na podstawie przyjętego modelu szacunkowe wartości mocy i sprawności siłowni porównano z wynikami uzyskanymi podczas testów odbiorczych przykładowej instalacji, przeprowadzonych przez jedno z wiodących konsorcjów, działających w obszarze systemów wytwarzania energii (SIEMENS AG. Power Generation Group).
This paper deals with analysis and simulation research of selected parameters of combined cycle plant. Presented work is focused on elaboration of the evaluation methodology of power and efficiency of combined cycle plant based on the author’s analytical model of considered installation. The estimated values of power and efficiency obtained on the basis of the elaborated model have been compared with the results obtained during the final tests of the exemplary installations carried out by the one of the leading producers of the systems in the power generation field.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Increasing the operational reliability of a ship by using a composite impeller in the event of hydrophore pump failure
Autorzy:: Jabłońska, Monika
Jurczak, Wojciech
Ozimina, Dariusz
Adamiak, Marcin
Tematy:: carbon-fibre reinforced polyethylene terephthalate glycol
PETG CF
ship’s impeller
pump test bench
pump useful power
total pump efficiency
reliability
3D printing; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:: https://bibliotekanauki.pl/articles/24200820.pdf Link otwiera się w nowym oknie
Opis:: The time-consuming technological process of manufacturing impellers and the high production costs are the reason for the search for alternative materials and manufacturing methods. In this paper, based on a literature analysis, the performance of a pump with an impeller that was manufactured by an incremental method from polyethylene terephthalate with an admixture of glycol and carbon fibre (PETG CF) was selected and studied. Operation tests were conducted on the ship’s rotodynamic pump test bench. The composite impeller pump was shown to have an efficiency at the selected printing parameters of 26,23%, comparable to a tin bronze impeller, which has an efficiency of 27,7%. The maximum pump useful power with the impellers tested was 337 W at a flow rate of 4.42 m3/h. The results confirm that, with a filament layer height of 0.12 mm and 100% fill in the four print contours, the pump characteristics obtained are consistent with those of the reference impeller. This fact ensures continuous operation of the ship’s pump for 48 hours which makes the chosen manufacturing method a reliable emergency method of impeller repair in offshore operations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Reduction of the soil environmental impact caused by the presence of total petroleum hydrocarbons (TPH) by using Pseudomonas sp.
Autorzy:: Paredes Páliz, Karina
Cunachi, Ana M.
Licta, Edwin
Tematy:: bioaugmentation
biodegradation
total petroleum hydrocarbons
efficiency
bacterium; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/35551186.pdf Link otwiera się w nowym oknie
Opis:: This research focuses on the bioaugmentation with Pseudomonas sp. (native) and Pseudomonas aeruginosa (commercial) for the biodegradation of total petroleum hydrocarbons (TPH) of the environmental soil samples of the AqLab laboratory in Orellana, Ecuador. Two treatments of sterilized soil (one inoculated with the native strain and the other inoculated with the commercial strain), where used for physical- -chemical analyzes as well as the degradation of TPH. They were evaluated every 20 days for a total period of 80–100 days. The native bacterium was isolated from the laboratory agglomerates in a selective culture medium specific for Pseudomonas sp. The biodegradation of the TPH exhibited a positive result after 80 and 100 days of treatment, with a reduction of 84 and 96% of initial TPH after the bacterial inoculation. The comparison between the two strains evaluated, commercial and native, showed a greater efficiency of biodegradation by the native strain isolated directly from the agglomerates, suggesting working with native strains of the place that have a greater adaptability to the contaminated environment that would ensure bioremediation processes faster and more efficient, low cost and environmentally friendly.
Dostawca treści:: Biblioteka Nauki

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