Solar Energy Conversion Systems in the Built Environment

Vişa, Ion; Duţă, Anca; Moldovan, Macedon; Burduhos, Bogdan; Neagoe, Mircea

doi:10.1007/978-3-030-34829-8

Cited by 17 publications

(12 citation statements)

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“…α is the solar altitude angle [7] calculated based on the declination angle (δ), hour angle (ω) and site latitude (ϕ) using:…”

Section: Site Weather Datamentioning

confidence: 99%

“…In the case of fixed photovoltaic platforms, this is obtained by optimizing the tilt angle of the photovoltaic modules in correlation with the characteristics of the implementation site. Thus, due to larger amount of solar energy during summer than winter, the tilt angle will be close to the complement of the solar elevation angle at summer solstice noon to maximize the received solar energy in this period [7]. This way of setting the tilt angle negatively affects the amount of the solar energy received during the winter days when the electrical energy demand of a heat pump system is higher.…”

Section: Introductionmentioning

confidence: 99%

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Yearly Electrical Energy Assessment of a Photovoltaic Platform/Geothermal Heat Pump Prosumer

2021

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Romania introduced in 2018 an amendment to the national law 220/2008 by including the Prosumer concept that allows investors in grid-connected photovoltaic systems with a capacity up to 27 kWp to receive a feed in tariff for the electricity delivered to the grid representing approximatively one third of the price paid when the electricity is consumed from the grid. Thus, the challenge is to use as much as possible the photovoltaic power when it is produced. A methodology is developed to evaluate how much of the electrical energy output of a grid-connected photovoltaic platform is used by a geothermal heat pump for space heating in a building. A numerical simulation is performed in Trnsys17 based on locally measured meteorological parameters over a period of one entire year. A case study is presented for which the characteristics of the building, of the heat pump system and of the photovoltaic system are described and integrated into the transient simulation environment. The numerical results are comparatively presented and discussed along with experimental data for sunny days in cold season. For the analysed case study, the self-consumption is 16%, significantly lower than the yearly coverage degree of 70%. Further research can be done to increase the self-consumption.

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“…α is the solar altitude angle [7] calculated based on the declination angle (δ), hour angle (ω) and site latitude (ϕ) using:…”

Section: Site Weather Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Yearly Electrical Energy Assessment of a Photovoltaic Platform/Geothermal Heat Pump Prosumer

2021

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“…Introducing biocoal in the industrial sector, and especially in thermal demand, calls for a change in the energy supply management model [38]. Energy production systems consist of sets of technologies that transform raw energy from one fuel into final use energy [17], allowing for the production of heat and/or electricity and of new biofuels. Based on the analysis of energy management, the energy to be produced will be assessed on the basis of the biocoal production in the roasting system as compared to its energy-based equivalence to the mass (m f ) of other conventional fuels, Equation 7.…”

Section: Phase 3: Energy Managementmentioning

confidence: 99%

“…However, modelling, conversion and energy management of resource supply are some of the main challenges in the current energy context [16]. In this regard, Visa et al [17] have defined the importance of characterizing energy production systems according to the nature of the energy resource used. Paredes-Sánchez and Ochoa-Lopez [18] established the importance of biomass modelling as an alternative to coal in the energy production systems.…”

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confidence: 99%

Energy Multiphase Model for Biocoal Conversion Systems by Means of a Nodal Network

2020

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The coal-producing territories in the world are facing the production of renewable energy in their thermal systems. The production of biocoal has emerged as one of the most promising thermo-energetic conversion technologies, intended as an alternative fuel to coal. The aim of this research is to assess how the model of biomass to biocoal conversion in mining areas is applied for thermal systems engineering. The Central Asturian Coal Basin (CACB; Spain) is the study area. The methodology used allows for the analysis of the resource as well as the thermo-energetic conversion and the management of the bioenergy throughout the different phases in a process of analytical hierarchy. This is carried out using a multiphase mathematical algorithm based on the availability of resources, the thermo-energetic conversion, and the energy management in the area of study. Based on the working conditions, this research highlights the potential of forest biomass as a raw material for biocoal production as well as for electrical and thermal purposes. The selected node operates through the bioenergy-match mode, which has yielded outputs of 23 MWe and 172 MWth, respectively.

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“…Among the renewable energy sources, solar energy is an abundant source that can be harnessed in the built environment [4,5]. Its main disadvantage is represented by its low energy density requiring large surfaces especially in the case of photovoltaic (PV) systems [6].…”

Section: Introductionmentioning

confidence: 99%

One Year Experimental Evaluation of the Electrical Gain by Solar Tracking a 12 KW Photovoltaic System Installed on a Building Rooftop

Moldovan

Vişa

2020

Mechanisms and Machine Science

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To fulfil the requirements of the European Directive 31/2010, by January 2021, all new buildings and those undergoing major renovation must have renewable energy systems implemented on or near the building targeting the nearly Zero Energy Building standard. In areas with high density of buildings the available surfaces to install solar energy conversion systems are limited. A solution to tackle this issue consists of implementing solar tracking systems to increase the amount of received solar energy and thus, the thermal or electrical energy output of the solar energy conversion system. A solar tracking mechanism, with 2 DOF and mono-axial diurnal movement implemented in the Renewable Energy Systems and Recycling R&D Centre of the Transilvania University of Brasov, Romania is presented in the paper. This mechanism simultaneously rotates eight photovoltaic strings (each string consisting of six photovoltaic modules) around North-South oriented horizontal axes. Experimental results obtained during 2018 are comparatively presented in the paper for the solar tracking photovoltaic system kept in a fixed position for the first six months of 2018 and with active solar tracking system during the last six months of 2018. Significant solar tracking gain of 59.4% resulted for the sunniest clear sky days in the monitoring period. When considering the entire monitoring period of six months with active solar tracking system vs. the six months in fixed position, a solar tracking gain of 24.89% resulted.

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Solar Energy Conversion Systems in the Built Environment

Cited by 17 publications

References 0 publications

Yearly Electrical Energy Assessment of a Photovoltaic Platform/Geothermal Heat Pump Prosumer

Yearly Electrical Energy Assessment of a Photovoltaic Platform/Geothermal Heat Pump Prosumer

Energy Multiphase Model for Biocoal Conversion Systems by Means of a Nodal Network

One Year Experimental Evaluation of the Electrical Gain by Solar Tracking a 12 KW Photovoltaic System Installed on a Building Rooftop

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