Wyniki wyszukiwania - BazTech

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Reduction of CO2 emission as a result of the use of 48-volt electrical installationsin passenger cars

Kozyra Jacek, Łukasik Zbigniew, Kuśmińska-Fijałkowska Aldona, Janota Aleš

Archives of Transport

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2023

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Vol. 66, iss. 2

7--20

EN

The introduction of a new standard of 48-volt electrical systems in cars comes at an additional cost to the vehicle. Acceptance of these costs is justified because it becomes a way to achieve lower CO2 emissions and lower fuel consumption. An important factor in favor of adopting 48-volt systems is the reduction in CO2 due to the use of a highly efficient 48-volt motor-generator unit coupled to a DC/DC converter. A methodology for testing new solutions to quantify CO2 savings and reductions therefore becomes crucial. This methodology must be capable of demonstrating the CO2 benefits primarily of the innovative technology proven in real-world driving conditions and with a large amount of realistic statistical data. The introduction of new eco-innovations must take into account the linkage and impact on other environmentally oriented ecoinnovative solutions. When implementing new technical solutions, a necessary aspect is the interaction with other innovations installed in vehicles with new electrical installation standards. Therefore, for the expected synergy of solutions to occur, two or more innovative technologies must be installed. Then the combined savings from one of them will affect the performance of the other technologies, and vice versa. The new technology of a high-efficiency 48-volt motor-generator unit cooperating with a 48V/12V DC/DC converter fits very well in creating interactions with other implemented solutions aimed at reducing CO2 emissions. The article discusses the problems of the introduced new technology of a high-efficiency 48-volt motor-generator unit cooperating with a 48V/12V DC/DC converter. The publication analyzes the impact of in creasing the voltage rating of current passenger car installations to 48V. Based on the methodology for determining the reduction of CO2 emissions of a vehicle with a 48V/12V DC/DC voltage converter installed, the mass of fuel per unit of engine operation time was determined. The amount of fuel saved was determined, and CO2 emission reductions were calculated for the three adopted passenger vehicles tested.

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Factors affecting the energy efficiency of fishing vessels

Szczepanek M.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2015

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nr 42 (114)

38--42

EN

The paper presents guidelines for the factors affecting the energy efficiency of fishing vessels. A main classification covers operational and structural factors. This classification is due to circumstances under which an opportunity to make decisions affecting the final energy consumption level arises. Under this approach one may distinguish operational and structural methods for energy efficiency management of fishing vessels.

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Some ways of fuel consumption reduction of diesel railway vehicles

Kalinčák D., Bartík L., Grenčík J.

Autobusy : technika, eksploatacja, systemy transportowe

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2013

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R. 14, nr 3

1957-1966

EN

The utilization of installed power capacity of internal combustion engines (ICE) in motive power units (especially in shunting locomotives and locomotives for industrial transport) is very low. The mean output of ICE in this operational mode is about 15 - 20 % of its installed power. The result is that most of the time the internal combustion engine works in regimes that are far from optimum mode. It means that specific fuel consumption is high. Some examples of measured operational regimes of locomotives in shunting operation and other motive power units are given in the paper. Kinetic energy of a classic diesel locomotive as well as the DMUs and trains is transformed into thermal energy during braking process. Normally it is not possible to utilize this kinetic energy in areasonable way. In order to improve fuel economy, the kinetic energy should be transformed into a suitable form and stored for subsequent use. The improvement can be achieved by using of the unconventional traction drive of rail vehicles. One of possible ways is using of the hybrid traction drive. The hybrid drive includes the ICE, generator, traction motors and the energy storage device. In this case the output of ICE can be substantially lower than in the classic traction. The parameters of such traction drive must be based on analysis of real operational regimes of vehicles. Those parameters are particularly: output of ICE,output of traction motors, capacity and output of energy storage devices (accumulators). There are other ways how to save fuel on railway vehicles, e.g. by better utilization of heat released from the fuel or using of solar energy.

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Analiza możliwości oszczędzania paliwa dla agregatu prądotwórczego przy pracy wyspowej

Kandyba A., Latko A., Machniewski J.

Prace Naukowe Politechniki Śląskiej. Elektryka

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2007

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z. 4

61-68

PL

W artykule przedstawiono wyniki analizy pracy agregatu prądotwórczego zasilanego z sieci gazowniczej, który stanowi element składowy zasilania zespołu budynków szkolnych wraz z pływalnią. Celem analizy było ustalenie opłacalności pracy agregatu prądotwórczego w szerokim zakresie zmian obciążeń. Założono, że potencjalne oszczędności mogą wystąpić w przypadku zmiennoobrotowej pracy agregatu. Przyjęto strukturę układu składającego się z silnika gazowego, generatora synchronicznego, który został połączony z lokalną siecią odbiorczą za pośrednictwem przekształtnika. Dla uproszczenia analizy przyjęto, że obwód przekształtnikowy składa się z prostownika diodowego (AC/DC) i układu boost. Obwód w takiej konfiguracji ma zadanie stabilizowania napięcia wyjściowego DC. W praktyce napięcie wyjściowe DC jest napięciem obwodu pośredniczącego 3-fazowego falownika napięcia zasilającego lokalną sieć odbiorczą.

EN

The analysis results of operation of a gas engine - electric generator unit fed from the gas network are presented in the paper. The generator is the part of power facility at the school and swimming pool complex. The aim of the analysis was estimating the worth while ness of the generator unit operation within the wide range of load changes. The potential savings could take place in the case of variable speed operation of the unit. The system structure was assumed to consist of a gas engine and a synchronous generator connected to the local autonomous grid by means of a power electronics converter. In order to simplify the analysis, it was assumed that the power electronics converter consisted of a diode rectifier (AC/DC) and a step-up boost converter (DC/DC) and its task was to stabilize the output DC voltage. In reality the output DC voltage is a DC link voltage of a 3-phase voltage inverter supplying the local autonomous grid.