Energy sovereignty in Italian inner areas: Off-grid renewable solutions for isolated systems and rural buildings

Menconi, Maria Elena; Dell’Anna, Stefano; Scarlato, Angelo; Grohmann, David

doi:10.1016/j.renene.2016.02.034

Cited by 33 publications

(17 citation statements)

References 18 publications

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“…σ is an empirical constant equal to 7.67 [21]. K is the kinematic momentum defined as: (3) where: ρ: Air density (kg/m 3 ) Jm: momentum deficit behind the tower The derived Jm expression [21] in terms of tower parameters can be written as:…”

Section: A Downwind Configuration -Tubular Towermentioning

confidence: 99%

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Analysis of Tower Shadow Effects on Battery Lifetime in Standalone Hybrid Wind-Diesel-Battery Systems

Gan

Shek

Mueller

2017

IEEE Trans. Ind. Electron.

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In a standalone hybrid wind-diesel-battery system, the battery lifetime is often optimistically overpredicted by hybrid system designers and battery manufacturers. As a result, battery replacement takes place more often than required. One of the reasons is due to the underestimation of battery wear from the short charge-discharge cycles, otherwise known as microcycles. A microcycle takes place when the power generation closely matches the load demand. The detrimental effect of microcycles on a battery-based standalone hybrid renewable energy system was previously investigated, however only from the perspective of short-term renewable energy fluctuations. This research paper provides new insight on battery lifetime reduction, resulting from microcycles which are generated through the tower shadow phenomena. Downwind wind turbines are considered here as their tower shadow effects are more significant compared to the upwind counterpart. This paper briefly presents the modeling of tower shadow profiles for both tubular and four-leg tower configurations. Experimental results have shown that the microcycles due to this non-ideal effect are significant in a battery-based standalone hybrid system. The quantification of the battery lifetime reduction due to this effect is demonstrated. Finally, the paper concludes with a sensitivity analysis of the battery lifetime reduction for different tower configurations, operating at different load conditions.

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Section: A Downwind Configuration -Tubular Towermentioning

confidence: 99%

“…The use of hybrid systems that couple renewable energy sources with diesel generation reduces diesel fuel usage. However, to date, a common design standard for off-grid systems has yet to be found and the reliability of batteries within an off-grid hybrid system still needs to be assessed [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Tower Shadow Effects on Battery Lifetime in Standalone Hybrid Wind-Diesel-Battery Systems

Gan

Shek

Mueller

2017

IEEE Trans. Ind. Electron.

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“…There is numerous con guration of photovoltaic systems; the essential con gurations are grid-connected P.V. system and stand-alone photovoltaic system [1]. The consumption of fossil fuel and the emission of greenhouse gases can be drastic decreases by using photovoltaic thermal (PVT) hybrid technology [2].…”

Section: Introductionmentioning

confidence: 99%

Analysis for sizing of the stand-alone solar photovoltaic thermal system for the residential house at Sultanpur

Singh¹,

Singh

Tiwari³

2020

Preprint

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Background: In this article, the potential applications of the solar photovoltaic thermal system have been discussed. The increasing cost and rapid depletion of conventional energy, researchers are optimizing the use of solar energy in residential and commercial purposes—the scope of solar energy, providing an alternative for residential and commercial power requirements. The average power requirement of a residential house is calculated with the help of power ratings. Hourly, daily, and monthly power requirement is calculated for designing the optimum size of solar photo voltaic thermal.Results: A stand-alone solar photovoltaic thermal system has been designed. For the sizing of the solar photovoltaic thermal system, meteorological data are collected through Synergy Enviro and PVWatts Calculator. The mathematical calculation and simulation study has been performed to estimate the expected power generation from the PVT. The cash flow and payback period of PVT are calculated. The total cost of installation was rupees 114450/- and the payback period was 9 years approximately.Conclusions: The forecasted output of solar photovoltaic thermal has been calculated based on solar radiation value obtained from different sources. The significant finding of the present study are: The maximum and the minimum electrical load was approximately 7.7 kWh per day in summer and about 2.5 kWh per day in winter. The maximum and minimum solar radiation at the installed site was 7.08 kWh / m 2 / day and 3.32 kWh / m 2 / day. The maximum electrical power calculated by installed solar module is 2466 kWh per year.

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“…in another hand, the offgrid systems with back-up (either diesel generators or chemical batteries) represent an alternative energy resource. This tendency is specific to countries that have enough solar resource throughout the year to make a PV system viable [20,21,22]. There are two types of structures of a photovoltaic system connected to the grid: centralized and decentralized.…”

Section: Introductionmentioning

confidence: 99%

Study and simulation of the energy performances of a grid-connected PV system supplying a residential house in north of Algeria

Laib

Hamidat

Haddadi

et al. 2018

Energy

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Worldwide, building is one of the most consuming energy sectors which are contributing significantly to the greenhouse effect, climate change and negative environmental impact. In Algeria, building sector is responsible of about 42% of the final energy consumption, with about 35% in the residential houses and 6% in the tertiary. This consumption is still in expansion, due to mainly on an exceptional growth of population and urbanism. The main objective of this paper is to study and assess the contribution of the grid-connected photovoltaic system in the energy balance in the residential building. A case study is applied in the northern region of Algeria. The photovoltaic system supplies the house with electricity during the sunny days, and during the night or the cloudy days, the house is powered by grid. The calculation of energy performance is based on the optimization, rationalization and saving energy approach. This takes into account the energy profiles of residential homes, real data and meteorological conditions (ambient temperature and irradiance). The results show clearly that the use of saving energy and grid-connected photovoltaic system allows a reduction of energy demand and a positive annual electricity balance of the studied residential house. The PV system generated 67.6% of the overall energy used in the house. Only, 33.4% are purchased from the grid. An energy positive balance of 2 kWh/day is observed.

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Energy sovereignty in Italian inner areas: Off-grid renewable solutions for isolated systems and rural buildings

Cited by 33 publications

References 18 publications

Analysis of Tower Shadow Effects on Battery Lifetime in Standalone Hybrid Wind-Diesel-Battery Systems

Analysis of Tower Shadow Effects on Battery Lifetime in Standalone Hybrid Wind-Diesel-Battery Systems

Analysis for sizing of the stand-alone solar photovoltaic thermal system for the residential house at Sultanpur

Study and simulation of the energy performances of a grid-connected PV system supplying a residential house in north of Algeria

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