scholarly journals Investigating the Effect of Dust Accumulation on the Solar Reflectivity of Coating Materials for Cool Roof Applications

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 445
Author(s):  
Hamed H. Saber ◽  
Ali E. Hajiah ◽  
Saleh A. Alshehri ◽  
Hussain J. Hussain
Keyword(s):  
Summer Season ◽  
Cleaning Process ◽  
Test Results ◽  
Test Protocol ◽  
Coating Materials ◽  
Incident Solar Radiation ◽  
Cool Roof ◽  
Industrial City ◽  
Reflective Coating ◽  
Cool Roofs

Cool roofs use reflective materials or coatings to reflect a portion of the incident solar radiation. This results in a lowering the surface temperature of the cool roof compared to black roofs, and thus helps reduce the cooling energy loads during the summer season. The research reported in this paper was conducted to assess experimentally and numerically the performance of cool and black roofs that were subjected to the hot, humid and dusty climate of Jubail Industrial City (JIC). This paper focused on characterizing one of the important properties of reflective coating material (RCM), which is its solar reflectivity. In this study, the effect of dust/dirt accumulation on the solar reflectivity of the RCM was investigated at different exposure times to the natural weathering conditions of JIC. The test results showed that dust and dirt can significantly contribute in reducing the solar reflectivity of the RCM. As such, a number of cleaning processes were conducted on the surface of the RCM so as to increase its solar reflectivity. The effect of each cleaning process on the solar reflectivity of the RCM was investigated. Finally, this paper provides a test protocol and procedure for characterizing the dust concentration/intensity on the surfaces of the RCM and cleaning this material after different exposure times to a natural and polluted climate.

Hygrothermal performance of cool roofs with reflective coating material subjected to hot, humid and dusty climate

2021 ◽  
pp. 174425912110014
Author(s):  
Hamed H Saber
Keyword(s):  
Total Energy ◽  
Numerical Simulations ◽  
Energy Savings ◽  
Weather Conditions ◽  
Energy Performance ◽  
Coating Material ◽  
Eastern Province ◽  
Cool Roof ◽  
Reflective Coating ◽  
Cool Roofs

The measurements for the short-wave solar reflectivity of a Reflective Coating Material (RCM) with various cleaning operations that were obtained in a previous study were used in this study to conduct numerical simulations in order to assess the moisture and energy performance of cool and black roofs when they were subjected to the weather conditions of Saudi Eastern Province and Kuwait City. The results of the numerical simulations showed that black roofs always work with less moisture than cool roofs. Because the highest relative humidity in the different components of the black and cool roofs was well below 80%, there was no risk of condensation and mold growth in these roofs. For both weather conditions of Saudi Eastern Province and Kuwait City, the results showed that installing cool roofs have resulted in increasing the heating energy loads in relation to black roofs. Conversely, the results showed that the decrease in the cooling energy loads due to installing cool roofs were typically much greater than the increase in the heating energy loads. As such, cool roofs have resulted in net energy savings in relation to black roofs. Replacing black roof by cool roof in Saudi climate, the results showed that the annual energy savings in the total energy load was 25% and 34% as a result of installing cool roof with RCM at no cleaning and weekly homemade cleaning, respectively. Additionally, replacing black roof by cool roof in Kuwaiti climate, the results showed that the annual energy savings in the total energy load was 23% and 31% a result of installing cool roof with RCM at no cleaning and weekly homemade cleaning, respectively.

Sunlight exposure: the effects on the performance of paragliding fabric

2018 ◽  
Vol 69 (05) ◽  
pp. 381-389
Author(s):  
MENGÜÇ GAMZE SÜPÜREN ◽  
TEMEL EMRAH ◽  
BOZDOĞAN FARUK
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Air Permeability ◽  
Sunlight Exposure ◽  
Test Results ◽  
Coating Materials ◽  
Strength Tests ◽  
Before And After ◽  
The Relationship ◽  
Dark Blue

This study was designed to explore the relationship between sunlight exposure and the mechanical properties of paragliding fabrics which have different colors, densities, yarn counts, and coating materials. This study exposed 5 different colors of paragliding fabrics (red, turquoise, dark blue, orange, and white) to intense sunlight for 150 hours during the summer from 9:00 a.m. to 3:00 p.m. for 5 days a week for 5 weeks. Before and after the UV radiation aging process, the air permeability, tensile strength, tear strength, and bursting strength tests were performed. Test results were also evaluated using statistical methods. According to the results, the fading of the turquoise fabric was found to be the highest among the studied fabrics. It was determined that there is a significant decrease in the mechanical properties of the fabrics after sunlight exposure. After aging, the fabrics become considerably weaker in the case of mechanical properties due to the degradation in both the dyestuff and macromolecular structure of the fiber

Thermal performance assessment of cool roofs on supermarkets through case analysis in 13 cities

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Juan Carlos Ríos-Fernández
Keyword(s):  
Energy Consumption ◽  
Air Conditioning ◽  
Energy Savings ◽  
Real Data ◽  
Research Approach ◽  
Environmental Implications ◽  
Content Type ◽  
Cool Roof ◽  
Increase Energy Efficiency ◽  
Cool Roofs

PurposeThis paper aims to study the use of cool roof technology to avoid unnecessary energy consumption in supermarkets. This will allow to reduce and even cancel the heat absorbed by the roofs, transferring it to the buildings and thus, creating more sustainable cities.Design/methodology/approachThirteen real supermarkets with cool roofs were analysed in Australia, Canada, the USA and Spain. An analysis of so many supermarkets located in different parts of the world with different climatic zones has allowed an inductive analysis, obtaining real data of energy consumption associated with the air conditioning installations for a year with and without implementing the cool roof technology.FindingsThe paper provides insights on how the use of cool roof managed to reduce the need for energy for heating, ventilating and air conditioning by between 3.5 and 38%. Additionally, this technology reduces the annual generation of carbon dioxide (CO2) emissions per square meter of supermarket up to 2.7 kgCO2/m2. It could be an economical technology to apply in new and old buildings with a period of average economic recovery of four years.Research limitations/implicationsBecause of the chosen research approach, the research results may be generalisable. Therefore, researchers are encouraged to test proposals in construction with other uses.Practical implicationsThe paper includes economic and environmental implications for the development of cool roof technology and smooths the way for its implementation to increase energy efficiency in commercial buildings.Originality/valueThis paper is an innovative contribution to the application of cool roof technology as a source of energy savings in commercial construction through the analysis of supermarkets located in different countries with different climate zones. This will help other researchers to advance in this field and facilitate the implementation of the technology.

scholarly journals The Need of Top Anti-reflective Coating Materials for ArF Immersion Lithography

2005 ◽  
Vol 18 (5) ◽  
pp. 627-630 ◽  
Author(s):  
Jae Chang Jung ◽  
Geunsu Lee ◽  
Sung Koo Lee ◽  
Keun Do Ban ◽  
Cheolkyu Bok ◽  
...  
Keyword(s):  
Coating Materials ◽  
Reflective Coating ◽  
Immersion Lithography

Solar Reflection Characteristics of Phthalocyanine Green/TiO2 Composite Green Pigments Prepared via Different Approaches

2016 ◽  
Vol 849 ◽  
pp. 725-731 ◽  
Author(s):  
Xiao Juan Feng ◽  
Qian Jin Mao ◽  
Qiu Rui Lv ◽  
Zi Ming Wang ◽  
Su Ping Cui
Keyword(s):  
Near Infrared ◽  
Sol Gel ◽  
Coating Materials ◽  
Gel Method ◽  
Sol Gel Method ◽  
Reflective Coating ◽  
Study Results ◽  
Infrared Spectral ◽  
Physical Mixing ◽  
Green Pigments

Near-infrared pigment is the key to control the near-infrared performance of solar heat-reflective coating which has good economic and application prospects as a new special coating. Green infrared reflective pigments were prepared through physical mixing, inorganic lake method and sol-gel processes in this study. Results show that the near-infrared spectral reflectance of composite pigments is improved when using inorganic lake method and sol-gel method. Chromaticity of composite pigment is the closest to phthalocyanine green when using sol-gel method. Physically mixing method is not suitable to prepare infrared reflective pigment. The coating materials have influence on the coating effect and the reflectivity of near-infrared spectral range in a certain extent.

scholarly journals Comparative Thermal Analysis of Different Cool Roof Materials for Minimizing Building Energy Consumption

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Y. Anand ◽  
A. Gupta ◽  
A. Maini ◽  
Avi Gupta ◽  
A. Sharma ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Urban Areas ◽  
Electricity Consumption ◽  
Building Envelope ◽  
Comfort Level ◽  
Urban Heat Islands ◽  
Heat Islands ◽  
Cool Roof ◽  
Cool Roofs ◽  
The Impact

The roof and walls in the urban areas contribute to major share in the absorption of solar radiations and also retard the outflow of the absorbed radiation from the building envelope, thereby increasing the global warming by inducing the heat island effect. The impact of using cool roof technologies on the thermal comfort of the office buildings has been estimated. Cool roofs reduce electricity consumption for maintaining the temperature of the air-conditioned buildings in the comfort level and also increase comfort in buildings merely not relying completely on cooling equipment. The cool roofs and cool pavements, however, can mitigate summer urban heat islands by improving indoor air quality and comfort. The thermal analysis of different materials has been carried out to analyze the impact of the rate of heat transfer on the building envelope and the results obtained indicate that different cool roof techniques are beneficial in maintaining the comfort level of the building which purely depends on the ambient temperature conditions.

Design of a Cool Color Glaze for a Solar Reflective Tile

2014 ◽  
Vol 92 ◽  
pp. 159-167
Author(s):  
Chiara Ferrari ◽  
Alberto Muscio ◽  
Cristina Siligardi ◽  
Tiziano Manfredini
Keyword(s):  
Chemical Durability ◽  
Inorganic Pigments ◽  
Heat Island ◽  
High Chemical ◽  
Cool Roof ◽  
Island Effect ◽  
Solar Reflectance ◽  
Thermal Emissivity ◽  
Urban Heat ◽  
Cool Roofs

One of the most common materials-measures to counteract Urban Heat Island Effect can be identified in cool roof: white surface characterized by high solar reflectance and high thermal emissivity. One of the problems for the realization of cool roof is the difficult matching of white color with urban planning needs. In order to better integrate cool roofs into skylines cool colors were developed integrating pigments into cool roof surfaces. Cool roof market is actually dominated by organic based products with optimal solar performances but low durability against ageing. The use of ceramic-based products is crucial in the design of a new durable cool roof thanks to their naturally high thermal emissivity (ε=0.90) and their high chemical durability. The development of a new ceramic-based product made by a traditional porcelain stoneware tile as support, an inorganic engobe was started in the last years. In order to complete the product with a suitable glaze, eight different inorganic pigments were added to three different glazes, each one characterized by different surfaces features. Even if the addition of glazes, and pigments decrease the reflectance values of the solar reflective engobe, some promising results were achieved in this study especially regarding warm colored glazes.

Susceptor Coating Materials Applicable for SiC Reactor Cleaning

2017 ◽  
Vol 897 ◽  
pp. 99-102 ◽  
Author(s):  
Kohei Shioda ◽  
Hitoshi Habuka ◽  
Hideki Ito ◽  
Shinichi Mitani ◽  
Yoshinao Takahashi
Keyword(s):  
Silicon Carbide ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Carbon Film ◽  
Chemical Vapor ◽  
Cleaning Process ◽  
Coating Materials ◽  
Chemical Vapor Deposition Reactor ◽  
Pyrolitic Carbon

In order to develop a cleaning process for the silicon carbide chemical vapor deposition reactor, the susceptor coating materials are developed for protecting the susceptor from the etching by chlorine trifluoride gas. The chlorine trifluoride gas does not give a serious damage to the pyrolitic carbon film at the temperatures lower than 480 °C, at which temperature the quick and practical reactor cleaning process is expected to be possible

scholarly journals A Conceptual Review of the Potential of Cool Roofs as an Effective Passive Solar Technique: Elaboration of Benefits and Drawbacks

2021 ◽  
Vol 9 ◽  
Author(s):  
Babak Ashtari ◽  
Mansour Yeganeh ◽  
Mohammadreza Bemanian ◽  
Bahareh Vojdani Fakhr
Keyword(s):  
Clean Energy ◽  
Building Energy ◽  
Energy Performance ◽  
Cool Roof ◽  
Indoor Thermal Comfort ◽  
Pros And Cons ◽  
Passive Solar ◽  
Number Of Publications ◽  
Roof Design ◽  
Cool Roofs

Cool roofs, as feasible and efficient passive solar technique that reduces building energy requirements for cooling and improves indoor thermal comfort conditions, have received considerable attention in recent years and as a result, a number of concepts, methods, and experiences have been developed during the related research. Although some studies have been conducted on this subject in the form of review articles, taking into consideration the large number of publications, there is still a call for some review papers dealing with the potential of cool roofs and providing a thorough report on their energy performance and a detailed summary of their pros and cons on the basis of the relevant studies. On this account, this study contributes a systematic review of the issued paper in Scopus and Web of Science regarding the cool roof technologies to recognize the advantages and challenges of cool roofs in practice and its future trends. In addition, detailed summary of advantages and drawbacks of this passive solar measure has been developed, as itemized factors corresponded to the codified references. A total of 90 published reports were analyzed, declaring that a cool roof is an efficient approach for generating clean energy on the building scale. This article induces an overall view of the advantages and restrictions of the cool roof throughout the world. Conclusions give a valuable reference for improving the cool roof design for their more widespread use in the building industry.

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