Energy and economic analysis and feasibility of retrofit actions in Italian residential historical buildings

Ciulla, Giuseppina; Galatioto, Alessandra; Ricciu, Roberto

doi:10.1016/j.enbuild.2016.07.044

Cited by 83 publications

(43 citation statements)

References 43 publications

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“…Nonetheless, the introduction of the new regulation on the performance of buildings [3], i.e., the introduction of nearly zero energy buildings (NZEBs) as the new building target [4,5], will force the building sector to handle simultaneously the heat losses and the air quality issues, since ventilation approaches not properly designed will likely not fulfill the limitation on energy need for space heating typical of the NZEBs [6][7][8]. Apart from new constructions, the strategic challenge in view of the reduction of the energy consumption of the building sector is the energy retrofit of the existing buildings [9][10][11][12][13]. This is even more important in countries (like Italy) characterized by a huge percentage (roughly 70%) of buildings built before any regulatory indication on building energy efficiency [14][15][16] and then without any carefulness to the ventilation issues.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ventilation Strategies on Indoor Air Quality and Energy Consumptions in Classrooms

et al. 2019

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Most of the school buildings in Italy are high energy-demanding buildings with no ad-hoc ventilation systems (i.e., naturally-ventilated buildings). Therefore, reducing the heat losses of schools represent the main aspect to be dealt with. Nonetheless, the indoor air quality of the building should be simultaneously considered. Indeed, to date, energy consumptions and air quality are considered as incompatible aspects especially in naturally-ventilated buildings. The aim of the present paper is to evaluate the effect of different ventilation and airing strategies on both indoor air quality and energy consumptions in high energy-demanding naturally-ventilated classrooms. To this purpose, an Italian test-classroom, characterized in terms of air permeability and thermophysical parameters of the envelope, was investigated by means of experimental analyses and simulations through CO2 mass balance equation during the heating season. The air quality was assessed in terms of indoor CO2 concentrations whereas the energy consumptions were evaluated through the asset rating approach. Results clearly report that not adequate indoor CO2 concentrations are measured in the classroom for free-running ventilation scenarios even in low densely populated conditions (2.2 m2 person−1), whereas scheduled airing procedures can reduce the indoor CO2 levels at the cost of higher energy need for ventilation. In particular, when airing periods leading to the air exchange rate required by standards are adopted, the CO2 concentration can decrease to values lower than 1000 ppm, but the ventilation losses increase up to 36% of the overall energy need for space heating of the classroom. On the contrary, when the same air exchange rate is applied through mechanical ventilation systems equipped with heat recovery units, the ventilation energy loss contribution decreases to 5% and the overall energy saving results higher than 30%. Such energy-saving was found even higher for occupancy scenarios characterized by more densely populated conditions of the classroom typically occurring in Italian classrooms.

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Section: Introductionmentioning

confidence: 99%

The Effect of Ventilation Strategies on Indoor Air Quality and Energy Consumptions in Classrooms

et al. 2019

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“…In addition to environmental protection, it is very important to meet the expectations of ordinary building users, who in general are not experts in the field of energy saving [2]. In building envelope insulation systems, we very often apply such insulation materials as expanded polystyrene (EPS) and extruded polystyrene (XPS) [3], or their modifications [4][5][6][7]. Such systems can be used on building envelopes as insulation from the inside, which is often applied in buildings having historical character [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies Involving the Impact of Solar Radiation on the Properties of Expanded Graphite Polystyrene

Krause¹,

Nowoświat²

2019

Energies

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This article presents the research studies aimed at identifying the behavior of expanded polystyrene with the addition of graphite in the conditions of exposure to solar radiation. For this purpose, a series of in situ tests and laboratory studies were carried out. Three types of material were tested, i.e. expanded polystyrene (EPS) (white polystyrene), polystyrene with the addition of graphite (gray polystyrene) and two-layer polystyrene (gray bottom layer and white top layer). Temperature distributions on the surfaces of the panels in field and laboratory conditions were determined. The distributions of temperature were recorded at varied wind impact (field conditions and laboratory conditions) and at varied impact of solar radiation (laboratory conditions). Based on the conducted experiments, differences in temperature distribution on the surfaces of the tested panels were determined. In addition, geometric changes and deformation levels of the tested white and gray expanded polystyrene panels exposed to artificial sun radiation were determined in laboratory conditions.

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“…Se destaca la posibilidad de considerar el cambio climático como una variable de incertidumbre en la generación de escenarios [6], pues el desempeño de las alternativas de inversión en eficiencia energética varía conforme al clima según evidencia Ciulla et al [13] en la priorización de las alternativas de inversión.…”

Section: Economic Assessment Of Energy Efficiency Investments In Dwelunclassified

Economic assessment of energy efficiency investments in dwellings = Evaluación económica de inversiones de eficiencia energética en viviendas

Hernández

2017

B&M

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En pro de la mejora del desempeño energético de los edificios, surge la necesidad de evaluar económicamente las inversiones de eficiencia energética asociadas a la rehabilitación de viviendas. Este punto de vista trata de ser una herramienta útil para analistas que se inicien en la evaluación económica de inversiones en eficiencia energética. La presente investigación muestra un marco conceptual de la evaluación económica de este tipo de inversiones en viviendas. Como resultado, es posible identificar dos enfoques presentes en los análisis económicos de esta naturaleza: el dinámico y el estático. Ambos métodos contrastan los beneficios (ahorros energéticos) con los costes de las inversiones en el tiempo. Sin embargo, diferencian la oportunidad y el momento en que la inversión debe realizarse dado un escenario de incertidumbre. Esta precisión conceptual permite estudiar varias publicaciones donde se evaluaron diferentes alternativas de reacondicionamiento en viviendas, confirmándose las consideraciones que deben tenerse presentes en momento de realizar la modelación económica: el tipo de enfoque a usar (dinámico o estático) y, en la definición de las alternativas de inversión y escenarios, los aspectos de tiempo, irrevocabilidad e incertidumbre. Eficiencia energética de la vivienda; Inversiones en eficiencia energética; Reacondicionamiento energético; Evaluación económicaEvaluación económica de inversiones de eficiencia energética en viviendas  The literature in appraisal of dwelling energy efficient investments is investigated, founding two approaches and examples. Five cases from publications are tackled finding that the static approach is more frequent than the dynamic approach. Literature shows that dynamic approach should be preferred, but its use is scarce.

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Energy and economic analysis and feasibility of retrofit actions in Italian residential historical buildings

Cited by 83 publications

References 43 publications

The Effect of Ventilation Strategies on Indoor Air Quality and Energy Consumptions in Classrooms

The Effect of Ventilation Strategies on Indoor Air Quality and Energy Consumptions in Classrooms

Experimental Studies Involving the Impact of Solar Radiation on the Properties of Expanded Graphite Polystyrene

Economic assessment of energy efficiency investments in dwellings = Evaluación económica de inversiones de eficiencia energética en viviendas

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