Wyniki wyszukiwania - BazTech

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Effect of Charging and Discharging Process of PCM with Paraffin and Al2O3 Additive Subjected to Three Point Temperature Locations

Kumar Sunil K., Muniamuthu Sumathy, Mohan A., Amirthalingam P., Anbu Muthuraja M.

Journal of Ecological Engineering

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2022

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Vol. 23, nr 2

34--42

EN

This analysis focused on investigating thermal storage behaviour on phase change material along with Al2O3 as an additive. The experimental investigation was performed by three set temperature points, i.e. 40 °C, 50 °C and 60 °C with the mass circulation rate through the tank of 5 kg/min, 3 kg/min and 2 kg/min. The forced circulation method was used to circulate the liquid, water was used as a working medium and Al2O3 as nano particle. Paraffin acts a phase change material to conduct the experimental procedure. The combination of paraffin with Al2O3 improves the latent heat storage of the material. The performance, with respect to charging and discharging of the material, was investigated and it was observed that the temperature location point of 50 °C shows the best results in terms of charging and discharging phenomena, compared to other two temperature location points. During the process of charging, the maximum rate of heat transfer can be achieved by Al2O3 nanofluids. Paraffin along with Al2O3 are characterized by the best thermal storage behaviour during the latent heat storage at charging process and dissipation of heat during discharge process. The rapid cooling comparison for three set location points has been studied and best solidification was achieved at the point of 60 °C; this is due to the rapid cooling at higher elevation temperatures. The energy that was stored in thermal form is to be transferred with the aid of heat exchanger, a special type heat exchanger employed in this analysis to transfer the heat. From this analysis it is concluded that paraffin with Al2O3 are characterized by the best performance in terms of the charging and discharging phenomenon.

2

Design and Simulation of Cyclic Battery Tester

Bilansky Juraj, Lacko Milan

Power Electronics and Drives

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2020

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Vol. 5 (40)

229--241

EN

The paper presents an approach to the modelling of a cyclic battery tester and contains observations about lithium-ion (Li-ion) batteries, charging/discharging procedures, conditions and protections which must be observed during the testing process. The main goal was to create and simulate a schematic which will be capable of cyclically testing Li-ion battery cells. Regulation of the final schematic is based on cascade connections of operation amplifiers, which work as a voltage source with current-limiting functions. The power part is created by two MOSFETs connected as a half-bridge. This topology allows current to flow in both directions (from and to the battery). Final simulation is supplemented by protections such as reverse polarity protection, short circuit protection and overvoltage protection during charging. Proper operation of the whole connection is demonstrated by the simulation outputs in the final section.

3

Electrospinning synthesis of 3D porous NiO nanorods as anode material for lithium-ion batteries

Kong X. W., Zhang R. L., Zhong S. K., Wu L.

Materials Science Poland

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2016

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Vol. 34, No. 2

227--232

EN

Three-dimensional NiO nanorods were synthesized as anode material by electrospinning method. X-ray diffraction results revealed that the product sintered at 400 °C had impure metallic nickel phase which, however, became pure NiO phase as the sintering temperature rose. Nevertheless, the nanorods sintered at 400, 500 and 600 °C had similar diameters (∼200 nm).The NiO nanorod material sintered at 500 °C was chip-shaped with a diameter of 200 nm and it exhibited a porous 3D structure. The nanorod sintered at 500 °C had the optimal electrochemical performance. Its discharge specific capacity was 1127 mAh·g−1 initially and remained as high as 400 mAh·g−1 at a current density of 55 mA·g−1 after 50 cycles.

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Zachowanie akumulatorów trakcyjnych zamontowanych w pojeździe elektrycznym

Bakun B.

Przegląd Elektrotechniczny

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2014

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R. 90, nr 2

152--155

PL

W niniejszym artykule przedstawiono problem eksploatacji pojazdu elektrycznego z zastosowaniem akumulatorów kwasowoołowiowych, połączonych w szereg i równolegle, bez systemu zarządzania stanem akumulatorów (BMS). Przedstawiony jest charakterystyczny i powtarzalny - w swoim sposobie - stan rozładowania akumulatorów.

EN

This paper presents the problem of using an electric vehicle using lead-acid batteries connected in series and in parallel, without Battery Management System (BMS). There is shown a characteristic and reproducible - in his way – battery state of charge.

5

Programowalny system do badań wybranych charakterystyk i parametrów akumulatorów

Grzesiak W., Maćków P., Maj T., Kubica D., Zawora S.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 10

77-79

PL

W artykule zaprezentowano programowalny system przeznaczony do wspomagania badań wybranych charakterystyk i parametrów akumulatorów. Powstał on z myślą o badaniach akumulatorów bazujących na technologii LiFePO4, ale z powodzeniem może być stosowany do rozwiązań opartych o inne technologie. System zbudowano w oparciu o programowalny zasilacz stałoprądowy, programowalne stałoprądowe obciążenie elektroniczne, multimetr oraz w specjalnie do tego celu zaprojektowany i wykonany układ do pomiaru temperatury i nadzoru systemu.

EN

The article presents programmable system to support of selected characteristics and parameters of batteries. Particularly it is dedicated for testing secondary batteries based on LiFePO4 cells, however is possible to utilize this system in other technologies. System is built on programmable DC power supply, programmable electronic DC load, digital multimeter and dedicated unit for temperature measurement and control system, designed and made by Authors.

6

Wpływ wodorotlenku wapnia na elektrochemiczne właściwości katod przeznaczonych do akumulatorów wodorkowych

Skowroński J.M., Turowski T.

Przemysł Chemiczny

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2005

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T. 84, nr 8

574-576

PL

Przeprowadzono badania wpływu dodatku Ca(OH)2 do elektrody niklowej typu Ni(OH)2/NiOOH. Powoduje on zarówno podwyższenie potencjału końca ładowania, jak i zdolności przyjmowania ładunku. Elektrody zawierające 0,5–3% mas. Ca(OH)2 już po pierwszym cyklu wykazują większą sprawność procesu wyładowania/ładowania, w porównaniu z elektrodami nie zawierającymi tego związku. Dla elektrod zawierających 0,5–2% mas. Ca(OH)2 w pierwszym cyklu ładowania/wyładowania stwierdzono zwiększenie masowej pojemności właściwej wyładowania o ok. 10%, zaś w kolejnych cyklach wartość ta pozostaje, o co najmniej 5% wyższa w stosunku do elektrody bez dodatku tego związku.

EN

After the 1st cycle, the Ni(OH)2/NiOOH-based Ni electrodes contg. 0.5–3% Ca(OH)2 showed increasingly better charge acceptance, higher (by 20–40 mV) final charging potentials, and a higher charge/discharge efficiency. In the 0.5–2% Ca(OH)2 electrodes, the mass specific capacity was 10% higher in the 1st charge/discharge cycle and 5% higher in the subsequent cycles.

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Co warto wiedzieć o bateriach używanych do przenośnych przyrządów pomiarowych

Dąbrowski J.

Nowa Elektrotechnika

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2005

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nr 8 (12)

14--15