A Methodology for Defining Electricity Demand in Energy Simulations Referred to the Italian Context

Caputo, Paola; Costa, G.; Zanotto, Valentina

doi:10.3390/en6126274

Cited by 27 publications

(21 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The core of the method is a more accurate tool to calculate the internal gains from lighting: this means that the contribution to internal gains from appliances and occupancy is assumed constant on the basis of literature reference values • applying the proposed calculation procedure to a real casestudy (the building hosting the Department of Energy at the Politecnico di Torino, Italy) and comparing the EP gl to the value which would be obtained through the assumption of 6 W/m 2 for all internal gains, as prescribed by the technical standards • estimating how the considered site influences the difference between the two approaches, repeating the calculations for a It is worth stressing that the procedure which is proposed in this paper refers to the energy certification, based on the standard use of a building, and not to the real utilization profile (HVAC and lighting systems, appliances, internal gains, regulation systems etc. ), like [13] did in their study. Internal loads and the electricity demand in real buildings depend on a high number of aspects.…”

Section: Objective Of the Studymentioning

confidence: 93%

“…In [13], they carried out a study on the energy and lighting performances for energy-efficient fluorescent lamps associated with electronic ballasts and high frequency photoelectric dimming controls installed in a school building. They showed that T5 fluorescent lamps associated with the electronic ballasts installed to replace the existing T8 light fittings with conventional ballasts lead to a 28% reduction in energy expenditure for electric lighting in a workshop room.…”

Section: Introductionmentioning

confidence: 99%

“…As summarized in [13], two different approaches can be used to get accurate input data to predict the energy consumption of a building: a top-down or a bottom-up approach. The top-down approach relies on macro-variables and "on long-time projections of energy demand according to historic response, but these are unable to model discontinuous advances in technology or to identify the end-use key areas for improvements".…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Methodology to Link the Internal Heat Gains from Lighting to the Global Consumption for the Energy Certification of Buildings in Italy

Verso

Mutani

Blaso

2014

Journal of Daylighting

View full text Add to dashboard Cite

This paper critically discusses the procedure prescribed by the Italian Technical Standards to account for the internal gains in the calculation of the energy performance indices for a building. This procedure is based on a tabular value set depending on the building usage only (e.g., 6 W/m 2 for office buildings), independently of the site and of the controls for blinds and lighting systems. Instead, the paper proposes a new procedure, which relies on the lighting energy numerical indicator (LENI) according to the European Standard EN 15193:2007. Basically, the procedure consists of the following steps: 1) internal gains from lighting are calculated accounting for the integration between electric appliances and daylighting; 2) these gains are summed to the internal gains from occupants and appliances; 3) the global gains are used as input data to calculate the energy performance indices for an office building (for space heating, space cooling, and lighting consumption) following the Italian Technical Standards. The office building which was used as case-study is the Department of Energy of the Politecnico di Torino. This was assumed to be located both in Turin (northern Italy) and in Palermo (southern Italy). In the study, the use of a manual on/off switch and of a photodimming sensor was also compared. For each configuration, the single and the global energy performance indices were calculated comparing two approaches to calculate the internal gains (Italian standard vs. new proposed procedure): a shift of one energy class for the building energy label was observed depending on the approach, which was used. BackgroundThe demand for more energy efficient solutions has risen with the worldwide growing concern about energy consumption. Buildings have been identified to play a major role in potential energy saving and new directives and standards are being issued to bound the integrated energy performance of new or renovated buildings within prescribed limits: the implementation of the European energy performance of buildings directives (EPBD) [1][2][3] at various national levels requires all new buildings achieve a building energy rating (BER) lower than the prescribed target energy rating (TER) for the specific building type. Within the European Union, a formal commitment was agreed to reduce by 2020 the primary energy consumption and overall greenhouse gas emissions by at least 20% below 1990 levels [4]. Following a mandate received from the European Commission [5], the European organization for standardization (CEN) started elaborating the various standards concerned with the EPBD to define a methodology to calculate the integrated energy performance of a building. Although an EPBD-Project Group was established for this purpose, due to the delays in completing the whole process, several countries have already adopted national calculation methods. As a consequence, the energy performance of the same system may be evaluated differently in different countries [6]. With regard to the Italian context, the ...

show abstract

Section: Objective Of the Studymentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Methodology to Link the Internal Heat Gains from Lighting to the Global Consumption for the Energy Certification of Buildings in Italy

Verso

Mutani

Blaso

2014

Journal of Daylighting

View full text Add to dashboard Cite

show abstract

“…shows deviations in annual yields lower than 3.5% and accordance with the generated electricity during the whole period under review. In addition to the PV generation profile, simulation of load demand is required, but the consumption in a household varies significantly dependent on environmental conditions and especially on consumer behavior, existing equipment and its home application [46]. These typical fluctuations are only observable at high time resolutions.…”

Section: Input Datamentioning

confidence: 99%

Influence of Hydrogen-Based Storage Systems on Self-Consumption and Self-Sufficiency of Residential Photovoltaic Systems

2015

View full text Add to dashboard Cite

This paper analyzes the behavior of residential solar-powered electrical energy storage systems. For this purpose, a simulation model based on MATLAB/Simulink is developed. Investigating both short-time and seasonal hydrogen-based storage systems, simulations on the basis of real weather data are processed on a timescale of 15 min for a consideration period of 3 years. A sensitivity analysis is conducted in order to identify the most important system parameters concerning the proportion of consumption and the degree of self-sufficiency. Therefore, the influences of storage capacity and of storage efficiencies are discussed. A short-time storage system can increase the proportion of consumption by up to 35 percentage points compared to a self-consumption system without storage. However, the seasonal storing system uses almost the entire energy produced by the photovoltaic (PV) system (nearly 100% self-consumption). Thereby, the energy drawn from the grid can be reduced and a degree of self-sufficiency of about 90% is achieved. Based on these findings, some scenarios to reach self-sufficiency are analyzed. The results show that full self-sufficiency will be possible with a seasonal hydrogen-based storage system if PV area and initial storage level are appropriate.

show abstract

“…The methodology illustrated in the Section 2.2 provides the current energy performance of the whole built environment at the city level; however, the methodology should also be able to support decision making about future energy planning 26 . In this context, a further effort was made to perform an analysis of different future scenarios using a deterministic method.…”

Section: Deterministic Heating Energy Consumption Modelingmentioning

confidence: 99%

A new clustering and visualization method to evaluate urban energy planning scenarios

Moghadam¹,

Coccolo²,

Mutani³

et al. 2018

Preprint

View full text Add to dashboard Cite

The spatial visualization is a very useful tool to help decision-makers in the urban planning process to create future energy transition strategies, implementing energy efficiency and renewable energy technologies in the context of sustainable cities. Statistical methods are often used to understand the driving parameters of energy consumption but rarely used to evaluate future urban renovation scenarios. Simulating whole cities using energy demand softwares can be very extensive in terms of computer resources and data collection. A new methodology, using city archetypes is proposed, here, to simulate the energy consumption of urban areas including urban energy planning scenarios. The objective of this paper is to present an innovative solution for the computation and visualization of energy saving at the city scale. The energy demand of cities, as well as the micro-climatic conditions, are calculated by using a simplified 3D model designed as function of the city urban geometrical and physical characteristics. Data are extracted from a GIS database that was used in a previous study. In this paper, we showed how the number of buildings to be simulated can be drastically reduced without affecting the accuracy of the results. This model is then used to evaluate the influence of two set of renovation solutions. The energy consumption are then integrated back in the GIS to identify the areas in the city where refurbishment works are needed more rapidly. The city of Settimo Torinese (Italy) is used as a demonstrator for the proposed methodology, which can be applied to all cities worldwide with limited amount of information. KeywordsBuilding Energy Consumption; Geographical Information System; Statistical Models; Deterministic Models; Urban Energy Planning. Highlights• We use a large building energy 2D-GIS database to predict an energy consumption by statistical methodology.• A new engineering methodology, using 3D city archetype, is proposed to estimate energy savings 1 for building retrofits.• We compared the results using monitored data and with energy consumption from a statistical method.• The proposed spatial decision support system is developed to visualize the refurbishment scenarios for decision-making processes.

show abstract

A Methodology for Defining Electricity Demand in Energy Simulations Referred to the Italian Context

Cited by 27 publications

References 17 publications

A Methodology to Link the Internal Heat Gains from Lighting to the Global Consumption for the Energy Certification of Buildings in Italy

A Methodology to Link the Internal Heat Gains from Lighting to the Global Consumption for the Energy Certification of Buildings in Italy

Influence of Hydrogen-Based Storage Systems on Self-Consumption and Self-Sufficiency of Residential Photovoltaic Systems

A new clustering and visualization method to evaluate urban energy planning scenarios

Contact Info

Product

Resources

About