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Numerical assessment of energy generation from photovoltaic cells using the CM-SAF PVGIS database

Cholewiński Maciej, Fąfara Jean-Marc

Archives of Electrical Engineering

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2022

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Vol. 71, nr 1

227--243

EN

The main objective of this article is to assess the legitimacy of using different tracking systems applied to the photovoltaic panels, for the city of Wroclaw (Poland), using 2 numerical tools: the CM SAF (Climate Monitoring Satellite Application Facility) and PVGIS (Photovoltaic Geographical Information System). In order to identify the solar irradiation, the CM-SAF database (based on the measurements of MFG – Meteosat First Generation – and MSG – Meteosat Second Generation – satellites) was utilised, while the PVGIS (Photovoltaic Geographical Information System) – to calculate the energy yield from PV panels. Particular attention was given to the optimisation of the annual tilt angle and the determination of the energy benefits from the implementation of the various sun tracking systems. Conducted studies showed that up to 30% more electricity yearly can be yielded after the replacement of PV cells with optimally fixed both azimuth and tilt angles by the 2-axis tracking system (179 kWh/m2 instead of 138 kWh/m2). Moreover, by the adequate decreasing of tilt angles in the summer time or obtaining the most favourable local solar exposure conditions, the supply curve of PV units may be significantly flattened, which may be beneficial when energy storage systems have low capacities.

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Układy hydrauliczne wysokich lotów

Cholewiński Maciej

Pompy, Pompownie

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2020

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nr 2

70--72

PL

Pompy i układy pompowe znajdują szerokie zastosowanie nie tylko w warunkach naziemnych, lecz także w przestworzach. Instalacje hydrauliczne stanowią bowiem niemal nieodzowny system każdego statku powietrznego, a ich wpływ na bezpieczeństwo lotu oraz możliwości realizacji poszczególnych manewrów - niezależnie od specyfiki cywilnego czy też wojskowego statku powietrznego - jest nie do przecenienia. Co jednocześnie istotne, ze względu na specyfikę tej grupy pojazdów, architektura tego systemu oraz jego elementy składowe mogą znacząco różnić się od tych stosowanych na lądzie czy też morzu. Z czego wynikają owe różnice i czym się one cechują?

3

Numerical assessment of thermal behaviour of a superconducting bus-bar with a Nuclotron-type cable

Tomków Łukasz, Cholewiński Maciej, Ciszek Marian, Chorowski Maciej

Archives of Electrical Engineering

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2020

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Vol. 69, nr 2

365--377

EN

Sections of the superconducting magnets of the SIS100 particle accelerator, under construction at the Facility for Antiproton and Ion Research (FAIR), the Society for Heavy Ion Research (GSI), Darmstadt, are going to be connected with the by-pass lines. Each line will be used to transfer a two-phase helium flow and an electric current. The electric current will be carried by four pairs of superconducting Nuclotron-type cables. Fast-ramping currents are expected to cause the generation of heat within the cables. In this work the results of a numerical thermal analysis of a bus-bar are presented. The amount of heat transferred from the environment was found based on geometric dimensions of the line and applied insulation. The amount of hysteresis loss, generated in the cable during the operation under most demanding regime of the operation of the accelerator, was calculated. According to the amount of the generated heat, the amount of the hysteresis loss is low in relation to the heat generated in the superconducting magnets. Also it was found that the cable used in the line still retains a large margin of current-carrying capacity.