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Pyrgou A.,The Cyprus Institute | Castaldo V.L.,Interuniversity Research Center on Pollution and Environment Mauro Felli | Castaldo V.L.,University of Perugia | Pisello A.L.,University of Perugia | And 5 more authors.
Sustainable Cities and Society | Year: 2017

Local climate phenomena impose a serious threat to the built environment. In particular, urban heat island and heatwaves can significantly affect buildings’ thermal-energy performance. The purpose of this study is to investigate summer hot periods and their impact on building thermal-energy behavior in an urban area in Italy. To this aim, the statistical analysis of the microclimate variation during monitored hot periods is performed by the analysis of local weather parameters collected from a dedicated meteorological station. Moreover, the numerical analysis of representative Italian residential buildings is carried out to determine the role of such phenomena on indoor thermal comfort and cooling energy requirements, by considering the consequences arising from heatwaves due to the indoor overheating stress. The analysis showed a strong negative correlation between temperature and relative humidity during extreme hot periods (∼−0.92). Positive correlation was noted between temperature and solar irradiance (∼0.62) and temperature and wind velocity (∼0.33). The southern winds registered in normal hot periods reduced the heat stress by cooling-down the south-facing urban surfaces. The numerical analysis demonstrated higher indoor temperature for insulated buildings, requiring more than three times the cooling requirement of traditional non-insulated buildings in extreme hot periods and exacerbating the occupants’ vulnerability. © 2016 Elsevier Ltd

Pisello A.L.,University of Perugia | Castaldo V.L.,Interuniversity Research Center on Pollution and Environment Mauro Felli | Piselli C.,Interuniversity Research Center on Pollution and Environment Mauro Felli | Pignatta G.,Interuniversity Research Center on Pollution and Environment Mauro Felli | Cotana F.,University of Perugia
Energy Procedia | Year: 2015

Recently, huge efforts were made to develop new passive solutions for optimizing building summer thermal-energy behavior. While cool roofs are well investigated, a lack of knowledge is detected about the benefits deriving from the combination of cool roofs and cool façades. This work aims at determining the thermal performance of innovative cool roofing membrane and cool façade painting when applied on a prototype building, through continuous monitoring. Additionally, sensitivity analysis is performed to investigate the thermal benefits of the coupled solutions. Results showed that the combined solutions generate significant passive cooling in terms of indoor operative temperature reduction. © 2015 Published by Elsevier Ltd.

Cobellis G.,University of Perugia | Petrozzi A.,Interuniversity Research Center on Pollution and Environment Mauro Felli | Forte C.,University of Perugia | Acuti G.,University of Perugia | And 6 more authors.
Sustainability (Switzerland) | Year: 2015

The effects of increasing concentrations of oregano (Origanum vulgare L.) and rosemary (Rosmarinus officinalis L.) essentials oil (EO) on ruminal gas emissions were tested in vitro using 50 mL serum bottles. Each bottle contained a 200 mg substrate (alfalfa hay and corn meal 1:1) and a 20 mL solution composed of a buffered medium and rumen fluid (1:2). The percentage of ruminal fermentation products was quantified by an infrared analyzer. The reduction of total gas production was 6% and 9% respectively when using the 1.5 and 2.0 g/L oregano EO measurements. The reduction of methane production was 55%, 72% and 71% respectively with regard to the 1.0, 1.5 and 2.0 g/L oregano EO doses, while rosemary EO (2.0 g/L) reduced the methane production by 9%. The production of ammonia was significantly reduced (59%-78%) by all treatments with the exception of rosemary EO at the lowest dose. Dry matter and neutral detergent fiber degradability was reduced by most of the treatments (respectively 4%-9% and 8%-24%). The total volatile fatty acids (VFA) concentration was markedly decreased by oregano EO and was not affected by rosemary EO. Both EOs mitigated rumen fermentations, but oregano EO gave rise to the highest reduction in methane and ammonia production. However, further research is needed to evaluate the use of these essential oils as dietary supplements by taking into account the negative effects on feed degradability. © 2015 by the authors.

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