Graphical analysis of photovoltaic generation and load matching in buildings: A novel way of studying self-consumption and self-sufficiency

Luthander, Rasmus; Nilsson, Annica M.; Widén, Joakim; Åberg, Magnus

doi:10.1016/j.apenergy.2019.05.058

Cited by 79 publications

(34 citation statements)

References 48 publications

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“…These results are in accordance with the indications included in various works related to limitations in the modernization of façades [29]. Although the improvement of the envelope clearly reduces the percentage of CO 2 emissions of the building, combining this measure with others, such as a more intelligent use of HVAC systems [40], self-consumption [41], and a greater generation of electrical energy with renewable sources at a national scale [42], is required. The combination of these measures, together with the improvement of the envelope, would more easily achieve a low-carbon building stock.…”

Section: Resultssupporting

confidence: 87%

Analysis of the Relationship of the Improvement of Façades and Thermal Bridges of Spanish Building Stock with the Mitigation of Its Energy and Environmental Impact

Bienvenido-Huertas

2020

Energies

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The energy improvement of building stock is essential to achieve a low-carbon economy. The improvement of façades is among the most common measures to reduce energy consumption. However, the effect of thermal bridges is undervalued in most cases. This study assesses the effect of improving building façades and thermal bridges. For this purpose, a case study is assessed for all climate zones in Spain, both in current and future scenarios, considering operational patterns from the COVID-19 pandemic. The study shows that the application of energy conservation measures focusing on reducing the thermal transmittance of façades and the linear thermal transmittance of thermal bridges has a more significant energy and environmental effect than other, more economical energy conservation measures that do not improve the effect of thermal bridges. Likewise, the application of energy conservation measures to improve façades can reduce carbon dioxide emissions but are far from achieving the 90% reduction set by the European Union by 2050. Consequently, these measures should be combined with other measures.

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Section: Resultssupporting

confidence: 87%

Analysis of the Relationship of the Improvement of Façades and Thermal Bridges of Spanish Building Stock with the Mitigation of Its Energy and Environmental Impact

Bienvenido-Huertas

2020

Energies

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“…These 5 kWp and 10 kWp limits represent past and current thresholds set in the Cypriot legislation for rooftop PV capacity. This analysis was performed using the energy matching chart proposed in [30]. Finally, the CO 2 emissions and the emissions reduction due to the PV generation were analyzed within this context, for 3 kWp, 5 kWp and 10 kWp PV generators.…”

Section: Methodsmentioning

confidence: 99%

“…The GTDR is a useful parameter for such analyses. Although this ratio has been used sporadically in the literature [15,19,30], here it has been formally defined as:…”

Section: Assessing the Load Matching Capabilities Of Householdsmentioning

confidence: 99%

Evaluation of Load Matching Indicators in Residential PV Systems-the Case of Cyprus

et al. 2020

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Three load matching indicators (self-consumption rate, self-sufficiency rate, loss of load probability) and the CO 2 emissions were evaluated for 55 Cypriot households with 3 kWp rooftop photovoltaic (PV) generators. The calculations were performed using 30-minute generation and consumption data from a large scale smart meter project in Cyprus. To investigate the effects of recent advances in local legislation, an analysis for higher PV capacities (5 kWp and 10 kWp) was also performed. The PV generation profiles for 5 kWp and 10 kWp PVs were obtained by scaling the 3 kWp PV generation profiles. The results showed that the self-consumption of the analyzed households varied seasonally, as it was related to their heating and cooling demand. More interestingly, the ratio between the households' annual electricity generation and demand, formally defined here as generation-to-demand ratio (GTDR), was found to be related to the value ranges of the studied load matching indicators. Hence, on average, households with 3 kWp PV generators annually self-consumed 48.17% and exported 2,415.10 kWh of their PV generation. On the other hand, households with larger PV generators were characterized by a higher GTDR, but lower load matching capabilities. For the cases of 5 kWp and 10 kWp PV generators, the average self-consumption fell to 34.05% and 19.31%, while the exported PV generation was equal to 5,122.47 kWh, and 12,534.90 kWh, respectively. Along with lower load matching capabilities, households that generated more than they consumed were also found to have a lower potential for CO 2 emissions reduction per installed kWp within the boundaries of the building. In this context, the GTDR could be used by stakeholders to characterize buildings, infer possible value ranges of more complex indicators and make evidence based decisions on policy and legislation.Energies 2020, 13, 1934 2 of 18 improvements in the building sector and the additional cooling load from the extreme temperature conditions [2]. Clearly, rapid and coordinated action is required to keep the building sector on track with sustainable development goals. In order to meet the 2-degree and 1.5-degree targets, in particular, the global emissions from the building sector should drop by 32 GtCO 2 , and 50 GtCO 2 , respectively [3]. This will likely be achieved through a combination of actions, such as the electrification of buildings [4], the integration of renewable energy sources (RES) [5] and deep retrofit measures [6]. Amidst this complexity, policy makers need to be guided by simple, but robust, indicators, in order to make evidence-based decisions.Very commonly, the energy performance of buildings is benchmarked by the intensity of primary energy use, the building material characteristics, and the minimum requirements of the renewable energy share or by the CO 2 emissions. These indicators are often found in the context of nearly zero energy buildings (NZEBs) which, in the EU, are regulated by the Energy Performance in Buildings Directive (EPBD) [7]. In essence,...

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“…Once renewable technologies that can meet current demands are identified, it is possible to create local energy scenarios and by using sustainability indicators proposed options can be formulated [10]. In assessing the potential of PV-battery system, Luthander et al [11] report the importance of the daily and seasonal matching between local energy production and consumption, using two indicators to express the load matching potential.…”

Section: Energy Performance Indicatorsmentioning

confidence: 99%

Indicators and Representation Tools to Measure the Technical-Economic Feasibility of a Renewable Energy Community. The Case Study of Villar Pellice (Italy)

Mutani¹,

Santantonio²,

Beltramino³

2021

IJSDP

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Energy Communities (EC) are intended as legal entities that can ensure environmental, economic, and social benefits for energy exchanges between its members. The Italian legislation has recently introduced incentives to Renewable Energy Communities (REC). This work analyses the case study of the REC in Villar Pellice (Turin) and defines a methodology to assess its technical-economic feasibility. The hourly energy consumption and the local renewable energy production are assessed through a place-based methodology, considering different category of end users (municipalities, residential dwelling, companies), and obtaining data from available online database. The REC energy performance is assessed through the self-consumption and the self-sufficiency indexes. Besides, cost-optimal analysis evaluates its economic feasibility, considering investment costs and economic incentives. Several interventions are hypothesized to compare possible REC scenarios (e.g., photovoltaic panels and storage systems installation, energy efficiency measures for public lighting, and different configurations of end users). Results show that REC allows to aggregate stakeholders, ensuring economic advantages and environmental benefits. The methodology applied in this work can support the design phase of the RECs. Its flexibility makes it adaptable to different territorial and regulatory contexts, in evaluating the optimal REC configuration to maximize revenues from the incentive and reach the highest level of energy independence.

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Graphical analysis of photovoltaic generation and load matching in buildings: A novel way of studying self-consumption and self-sufficiency

Cited by 79 publications

References 48 publications

Analysis of the Relationship of the Improvement of Façades and Thermal Bridges of Spanish Building Stock with the Mitigation of Its Energy and Environmental Impact

Analysis of the Relationship of the Improvement of Façades and Thermal Bridges of Spanish Building Stock with the Mitigation of Its Energy and Environmental Impact

Evaluation of Load Matching Indicators in Residential PV Systems-the Case of Cyprus

Indicators and Representation Tools to Measure the Technical-Economic Feasibility of a Renewable Energy Community. The Case Study of Villar Pellice (Italy)

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