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Natural aging of cool walls: Impact on solar reflectance, sensitivity to thermal shocks and building energy needs. Wall finishes with high solar reflectance and thermal emittance, commonly known as cool walls, can reduce the exterior surface temperatures of façades, and consequently the building cooling energy needs and power demand, and lower the sensitivity to degradation.
Aging, though, may affect their performance. To investigate this risk, we exposed for four years in Milan, Italy, two series of façade finish coats, white and beige, facing north and south, in vertical and vertical-sheltered position, and we measured their solar spectral reflectance and thermal emittance before and after aging. The solar reflectance of the white finish coats drops from 0.
Finally, the moisture content in the external layers is reduced, showing the impact on the heat and mass balance because of the uncertainty in solar absorption due to aging.
Determinazione del profilo caratteristico di prestazione ottica di un pannello semitrasparente in PMMA e fibrocemento al variare della geometria e del contesto. Scopo di questo contributo è quello di definire la prestazione offerta da un elemento semitrasparente in calcestruzzo al variare del suo contesto applicativo, nel caso sia impiegato come sistema di chiusura trasaparente o schermatura.
Nella prima parte delle lavoro vengono riportati i risultati relativi alle misure di caratterizzazione ottico-radiativa e il comportamento del pannello rispetto alla radiazione incidente. Optical and radiative properties of textiles used for light temporary structures: Jul IsteA Comfort control and assessment in open spaces is an issue widely treated in literature, as well as the effectiveness of possible mitigation strategies green area, shadings etc.
The aim of this paper is to identify and compare textile material for roofing, considering different properties such as tensile strength, embodied energy, cost and how their optical-radiative behavior affect comfort. Hence, for a selection of two types of textile that have different optical-radiative properties we simulated the air temperature and, in accordance with UTCI index, the hourly comfort of the users under a reference roofing structure.
The effects of soiling on textile surfaces and how affects the decay of optical-radiative properties is already investigated. The performance decay analysis during time was carried out on a membrane made of polyester with a PVC coating and an additional protective PVDF layer. Optical and radiative measurements at zero time were performed obtaining, in accordance with iso integrated values of 4. After 3 and 6 months of exposure, reflectance and transmittance measurements were measured again.
Shading devices with 3D geometry: Characterization of optical and radiative properties and evaluation of energetic efficacy for different exposures. Heat and luminous fluxes cannot be modulated only by single glazing; thus, the transparent surfaces are protected by an external shading element with different efficacy grades, in function of the material consistency, morphology, and handling typology. In steel and glass architectures, whose design is often experimental, there is a more and more frequent use of elements characterized by a three-dimensional matrix and a multi-directional performances, as for instance expanded metal or perforated metal sheets, micro and geosynthetic fabrics.
The objective of this contribution is to determine, for several typologies of materials with 3D matrix, the optical-energetic behaviour and the correlation between geometry variation and performance, as a function of the angle of incidence of solar radiation. Then with numerical simulation we compared their performance and shading efficacy. The analysis carried out shows that solar transmittance does not always decrease with increasing angle of incidence.
For the selected samples, the relative positioning of the texture horizontal or vertical affects the transmittance values: Are you a researcher? Yes, I'm a researcher. Navy suedette 'Barleena' block heel ankle boots. Black faux leather 'Baker' high block heel ankle boots.
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