Andmebaasi logo

Sirvi Autor "Libra, M." järgi

Nüüd näidatakse 1 - 4 4
  • Pisipilt
    Kirje
    Autonomous photovoltaic system for night-time lighting in the stable
    (2019) Dang, M-Q.; Šafránková, J.; Libra, M.; Poulek, V.; Kouřím, P.; Sedláček, J.
    Autonomous photovoltaic (PV) systems are suitable, for example, for powering various appliances or scientific instruments in the field, for automatic data collection, for signaling, etc. At the Czech University of Life Sciences Prague, we have designed an experimental autonomous PV system designed for night-time lighting for orientating in a stable for horses. The article describes the construction of a PV system with a PV panel rated at 170 Wp, with a lead-acid accumulator and a 1,5 W LED light source. The data collection was automated. The data evaluation shows that during the whole year, the PV system has been recharged and there was no lighting failure. The paper also presents important measured characteristics.
  • Pisipilt
    Kirje
    Comparison of predicted and real parameters of PV systems in the Czech Republic and Spain
    (2018) Olšan, T.; Soucase, B. M.; Libra, M.
    This paper compares predicted performance by a simulation software for a given new constructed PV system of crystalline silicon technology located in Prague with 10 kWp peak power and a similar system in Spain. Simulation software used for the sake of this paper was publicly available PVGIS from the website of its creators, parameters were set to be the same like in the real PV system. The difference between the predicted and the real data was calculated and then discussed in the result section of this pape r. Suggestion how to increase the accuracy of the prediction by the simulation software is in the discussion part of this paper.
  • Pisipilt
    Kirje
    Design and data comparison of the photovoltaic power plants in the southern and northern hemispheres
    (2020) Daneček, M.; Havrlík, M.; Beránek, V.; Šafránková, J.; Libra, M.; Poulek, V.; Sedláček, J.; Belza, R.
    We have recently developed a unique monitoring system for photovoltaic power plants and have gradually improved it in recent years. The system is installed at about 80 power plants in several European countries and at one power plant in Chile. We collect and evaluate all data in our laboratory. In this paper we describe the unique design of a photovoltaic power plant in the southern hemisphere in Chile with photovoltaic panels installed on tracking stands. We present the evaluated data and we discuss their comparison with photovoltaic power plants installed in Europe. We also discuss different solar conditions of these locations.
  • Pisipilt
    Kirje
    Operation of the photovoltaic system in Prague and data evaluation
    (2021) Šafránková, J.; Petrík, T.; Libra, M.; Beránek, V.; Poulek, V.; Belza, R.; Sedláček, J.
    The on-grid photovoltaic system was installed at the Faculty of Engineering in 2015. The monitoring system developed in our laboratory monitors data and can also detect failure and type of failure. The evaluation of the data shows that the amount of electricity produced slightly exceeds the expected values predicted by the internationally used internet application PVGIS. The effect of the aging of PV panels has so far had a minimal effect on the electricity produced. Immediate output power is affected by multiple parameters. Higher temperatures reduce the efficiency of energy conversion, so in summer the instantaneous power may be lower even at higher radiation intensity and smaller angle of incidence.