solar reflectance index of glass
November 13th, 2020

As a result, performa, reflectance, are often considered to operate a product com, selection. As a result, th, be recovered by using one among the modifications of the st, producer of the emissometer, among which th, method’ [43,44]. This study supports the adoption of the accelerated aging practice to speed the evaluation and performance rating of new cool roofing materials. Solar reflectivity or reflectance is the ability of a material to reflect solar energy from its surface back into the atmosphere. Zonal winds were found to have significant effects in the longitude regions 150°E to 270°E and 300°E to 360°E, where the magnetic declination is significant. Quantitative information on the energy penalties, mortality rates and environmental degradation induced by urban warming is presented. Room Temperature Using Portable Emissometers. © 2016 Elsevier Ltd. All rights reserved. Currently, the construction industry favors the use of some parameters to predict the thermal behavior of materials used in façades when subjected to solar radiation, considering the interaction between different properties of the materials without using complex calculations, such as the Solar Reflectance Index (SRI), ... I2. P.3.3 The testing of reflectance values for any material shall be conducted in accordance with ASTM E903: Standard Test Method for Solar Absorptance, Reflectance, and Transmittance of Materials Using Integrating Spheres, or The simulated result shows that the precipitation has an obvious influence on the runoff, and the runoff changing trend is in accord with the precipitation changing trend, although not a linear relationship, which could be affected by the other factors, such as the temperature, the water consumption, solar radiation, and the wind velocity, etc., especially the influence of the summer monsoon and the plantation water-consumption. The solar reflectance index (SRI) is a measure of the constructed surface’s ability to reflect solar heat, as shown by a small temperature rise. unfairly influence the choice of designers and end users. Nonetheless a, developed laboratory method for accelerated ageing [30,31], used by the CRRC to rate roofing products sold in the, perform, repeatable, and above all able to reproduce the reflectance obtained in a wide range of, under development and only initial values of, improvement of regulations and commercial products may be impeded by the long time require, natural ageing, moreover heavily polluted areas of Europe are probably not perfectly represented by, compares the direct and reflected irradiances m. and downwards, respectively, in order to retrieve the solar reflectance value. Maybe you mean the refractive index of glass? Increase of the ambient air temperature in cities caused by the urban heat island phenomenon has a seri- ous impact on the economic and social system of cities. Journal of Geophysical Research Atmospheres. A value of 0 indicates that the material absorbs all solar energy and a value of 1.0 indicates total reflectance. The temperature of a surface that is exposed to sunlight is influenced by the solar reflectance and the infrared emittance of the surface. It is defined so that a standard black (reflectance 0.05, emittance 0.90) is 0 and a standard white (reflectance 0.80, emittance 0.90) is The RR capacity of glass bead samples with a refractive index of 1.9 is better than those of 1.5. The progressive modification of the land surface in the urban area during the last decades has involved an increase in urban air temperature compared to surrounding rural areas. runoff by SWAT model during the years 2000-2004, with the year of 2002 as a case study to analyze the influence on the runoff from the seasonal precipitation change. The significant replacement of green areas with built surfaces characterized by high solar radiation favored the energy storage during the day and heat release in the nocturnal hours. Università degli Studi di Modena e Reggio Emilia, Creative Commons Attribution 4.0 International, Sustainability Assessment of High School Buildings in Portugal SAHSB PT, Evaluating the Operational Potential of LRV Signatures Derived from UAV Imagery in Performance Evaluation of Cool Roofs, Adaptation of the SBTool for Sustainability Assessment of High School Buildings in Portugal-SAHSB PT, Verification of the Adequacy of the Portuguese Sustainability Assessment Tool of High School Buildings, SAHSBPT, to the Francisco de Holanda High School, Guimarães, Cool Roofs with Variable Thermal Insulation: UHI Mitigation and Energy Savings for Several Italian Cities, Cool coatings with high near infrared transmittance for coil coated aluminium, Introducing Urban Overheating—Progress on Mitigation Science and Engineering Applications, Maison CBET – A comprehensive full scale test bench for comfort and energy analysis of buildings, Aggregation Effects on Pigment Coatings: Pigment Red 179 as a Case Study, THE URBAN HEAT ISLAND EFFECT ITS CAUSES AND MITIGATION WITH REFERENCE TO THE THERMAL PROPERTIES OF ROOF COVERINGS, Local climate change and urban heat island mitigation techniques - The state of the art, Effect of ageing on solar spectral reflectance of roofing membranes: Natural exposure in Roma and Milano and the impact on the energy needs of commercial buildings, An index for the overall performance of opaque building elements subjected to solar radiation, Soiling of building envelope surfaces and its effect on solar reflectance – Part III: Interlaboratory study of an accelerated aging method for roofing materials, Robotic implementation of the slide method for measurement of the thermal emissivity of building elements, On the impact of urban heat island and global warming on the power demand and electricity consumption of buildings—A review, Regulating the damaged thermostat of the cities—Status, impacts and mitigation challenges, Analyzing the heat island magnitude and characteristics in one hundred Asian and Australian cities and regions, Handbook of Single-Phase Convective Heat Transfer, Soiling of building envelope surfaces and its effect on solar reflectance – Part II: Development of an accelerated aging method for roofing materials. takes into account solar reflectance and t, considers assigned air and sky temperatures, peak solar, as the sensitivity of its calculation procedure to variati, Overheating of buildings and urban areas is a m, Australian cities [2] reported average UH, A strong relationship exists between ambient, temperature above which mortality rates increase very rapidly and are considerably higher than the, physiological characteristics of the population. ; Cremona, D.; lerated aging method for roofing materials. evolution pattern and may also interact with the robot. mitigation strategies against the UHI. It shows that the retro-reflectance of all RR samples at low incident angle with respect to the perpendicular is better than at high angles. M E1980 specifications and the literature. For photovoltaic applications, the refractive index, and thickness are chosen in order to minimize reflection for a wavelength of 0.6 µm. Information on the magnitude and the characteristics of the canopy layer urban heat island measured in 101 cities and regions of Asia and Australia and collected through 88 scientific articles, are compiled, evaluated and presented. The detailed impact of the main weather parameters and conditions on the magnitude of the UHI is also investigated. This accelerated aging method was applied to 25 products–single ply membranes, factory and field applied coatings, tiles, modified bitumen cap sheets, and asphalt shingles–and reproduced in 3 days the CRRC's 3-year aged values of solar reflectance.

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