Search results for "PV"
showing 10 items of 704 documents
A PV plant simulator for testing MPPT techniques
2013
This paper introduces a versatile and reliable photovoltaic systems simulator. It includes the main components of a photovoltaic plant: a PV string and a PWM controlled boost chooper. The key feature of this simulator is the ability to consider different and non-uniform irradiation and temperature conditions (partial shading and partial heating of the strings). All the different I-V and P-V or P-I characteristics can then be determined in such non-uniform irradiation and temperature conditions, with the aim to try different MPPT algorithms. The simulator also allows to verify an enhanced version of the Incremental Conductance algorithm (IncCond) where, in order to reach the real absolute ma…
Empirical estimates of the radiative impact of an unusually extreme dust and wildfire episode on the performance of a photovoltaic plant in Western M…
2019
Abstract We have estimated the radiative impact produced by an unusually extreme dust and wildfire episode on the performance of a photovoltaic (PV) plant. The dust and wildfire events were mostly active on 26–28 and 29–30 June 2012, respectively. We took advantage of the consecutiveness of both events to separate and derive empirically the radiative effect of dust and smoke aerosols. With this purpose, we employed measurements of aerosol load, radiation and PV power output from a collocated atmospheric station and PV plant located at Burjassot (Valencia, Spain). The empirical estimates were obtained by direct comparison with a summer background day, happened right before the two consecutiv…
Empowering Photovoltaics with Smart Light Management Technologies
2021
The daily Sun supplies the continents of the Earth with four times more energy than humanity consumes in a year. This enormous potential of solar energy to generate clean energy is therefore driving great efforts to replace conventional and unsustainable fossil fuel consumption that damages our climate and our environment. Solar photovoltaic (PV) is emerging as the fastest growing renewable energy technology in the world, yet its share to the electricity production currently is less than 3%. While coal and gas remain key to electricity production, the climate crisis demands a fast transition to a carbon-neutral energy system. In the year 2019, the PV industry produced solar panels with a ca…
Exergetic and exergoeconomic analysis of a renewable polygeneration system serving a small isolated community
2014
A great interest has been arising in the last decade for the sustainable supply of energy and fresh water, also due to the rapidly growing demand from developing countries. Facing this demand by traditional technologies and fossil energy sources implies evident difficulties and risks, because of the scarcity and high cost of fuels and their relevant environmental impact in terms of local pollution and global warming emissions. Then, the efforts of researchers have been focusing on alternative solutions, either based on the use of renewable energy sources and on innovative plant schemes for the combined and efficient production of several energy and material flows. In this paper an innovativ…
A novel solar trigeneration system integrating Photovoltaic/Thermal collectors and seawater desalination: dynamic simulation and economic assessment
2013
This paper investigates the integration of renewable energy sources and water systems, presenting a novel solar system producing simultaneously: electrical energy, thermal energy, cooling energy and domestic water. The polygeneration system under analysis includes photovoltaic/thermal solar collectors (PVT), a multi-effect distillation (MED) system for seawater desalination, a single-stage LiBr-H2O absorption chiller and additional components, such as storage tanks, auxiliary heaters and balance of plant devices. The PVT produces simultaneously electrical energy and thermal energy, at a maximum temperature of about 100 °C. The electrical energy is delivered to the grid, whereas the thermal …
A Comparison of Solar and Conventional Pavements Via Life Cycle Assessment
2023
The sustainable and green development of roads is lately receiving significant attention. As a multi-functional road capable of both accommodating traffic loads and generating clean energy, solar pavements exhibit a strategic opportunity for the future path of development in the road engineering. Although solar pavements have significant environmental benefits during their operation, they can lead to increased carbon emissions during the process of material preparation, construction, maintenance, etc. Therefore, it is essential to implement the framework of Life Cycle Assessment (LCA) to investigate their potential environmental impacts and/or benefits. Hence, this paper systematically anal…
Meticilīnrezistences gēna mecA un toksīna PVL sintēzi noteicošā gēna luk molekulāri bioloģiskā noteikšana Staphylococcus aureus izolātos
2021
Staphylococcus aureus, it īpaši tā meticilīnrezistentie celmi ir vieni no izturīgākajiem mikroorganismiem visā pasaulē, kas pateicoties tiem piemītošajai ģenētiskajai daudzveidībai spēj mainīt sev piederošo virulences faktoru ekspresiju. Tā rezultātā kļūstot par strukturāli un ķīmiski daudzveidīgiem mikroorganismiem, kam ir būtiska loma ar veselības aprūpi saistīto infekciju izplatībā. Mūsdienās, neskatoties uz pēdējos gados vērojamo MRSA celmu izplatības samazināšanos lielākajā daļā ES lielvalstu, arvien biežāk tiek ziņots par pieaugošu Panton-Valentine leikocidīna pozitīvu S. aureus celmu izplatību. Pateicoties, kam tiek sekmēta gan antibakteriālās rezistences attīstība, gan organisma imū…
Сборник действующих договоров, соглашений и конвенций, заключенных Р.С.Ф.С.Р. с иностранными государствами. Вып. 2: Действующие договоры, соглашения …
1921
Содержание: Отдел I. Союзные договоры и соглашения: Армения, Белоруссия, Бухара. Отдел II. Договоры об установлении сношений: Афганистан, Великобритания, Германия, Монголия, Норвегия, Персия, Польша, Турция. Отдел III. Договоры и соглашения о границах: Дальне-Восточная Республика, Польша. Отдел IV. Соглашения по правовым вопросам: Венгрия, Германия, Латвия, Литва, Польша, Турция. Отдел V. Соглашения по экономическим вопросам: Финляндия. Отдел VI. Соглашения по вопросам транзита: Дальне-Восточная Республика, Латвия. Отдел VII. Соглашения по вопросам почтово-телеграфной связи: Латвия, Эстония. Приложение: Американская Администрация помощи. Указатель договоров по странам
Сборник действующих договоров, соглашений и конвенций, заключенных Р.С.Ф.С.Р. с иностранными государствами. Вып.1: Действующие договоры, соглашения и…
1921
Содержание: Отдел I. Союзные договоры и соглашения : Азербейджан, Белоруссия, Украйна, Хорезм. Отдел II. Договоры об установлении сношений : Грузия, Латвия, Литва, Польша, Румыния, Финляндия, Эстония. Отдел III. Соглашения по правовым вопросам : Австрия, Бельгия, Великобритания, Венгрия, Германия, Грузия, Дания, Италия, Латвия, Литва, Франция, Эстония. Отдел IV. Соглашения по экономическим вопросам : Грузия, Дальне-Восточная Республика, Эстония. Отдел V. Соглашения по вопросам здравохранения и социального обеспечения. Добавление к отделу III : Эстония. Указатель договоров по странам
Hibrīddraudu novēršana Latvijā, Zviedrijā un Spānijā
2022
Maģistra darbā "Hibrīddraudu novēršana Latvijā, Zviedrijā un Spānijā" tiek pētīti un salīdzināti hibrīddraudu novēršanas pasākumi Latvijā, Zviedrijā un Spānijā kopš 2014. gada (Krievijas hibrīdkara pret Ukrainu) līdz 2022. gadam (Krievijas pilna mēroga karadarbībai pret Ukrainu). Pētījumā tiek aplūkota dažādu faktoru ietekme uz starpvalstu sadarbības veidošanos hibrīddraudu novēršanas jomā, īpašu uzsvaru liekot uz atšķirīgiem plānošanas cikliem. Darba teorētisko ietvaru veido mūsdienu hibrīddraudu galveno izpausmju un to novēršanas iespēju apraksts. Balstoties uz teorētiskajām atziņām, tiek izvirzīti empīriskās izpētes kritēriji – visas valdības (whole-of-government) un visas sabiedrības (w…