Study on the influence of albedo on building heat environment in a year-round

Yu, Bo; Chen, Zhi; Shang, Pingjun; Yang, Juan

doi:10.1016/j.enbuild.2007.07.009

Cited by 18 publications

(10 citation statements)

References 11 publications

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“…A modelling study [10] has shown the benefits in retail store at different climates. Cool Roofs have also been studied in experimental facilities; [11,12].…”

Section: Introductionmentioning

confidence: 99%

Cool roof technology in London: An experimental and modelling study

Kolokotroni

Gowreesunker

Giridharan

2013

Energy and Buildings

170

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One of the primary reasons for the application of cool materials is their energy and associated environmental impact on the built environment. Cool materials are usually applied on the roof of buildings to reduce cooling energy demand. The relative benefits of this reduction depend on the construction of the building, external weather conditions and use of the building. This paper examines the impact from the application of a reflective paint on a flat roof in a naturally ventilated office building in the area of London, UK where the climate is moderate with high heating demand by buildings.The environmental conditions (internal/external air and surface temperatures) of the building were monitored before and after the application of the cool roof during the summer. It was found that internal temperatures were reduced after the application of the cool roof. The building was modelled using TRNSYS and the model was calibrated successfully using the measurements. A parametric analysis was carried out by varying the reflectivity and insulation of the roof and ventilation rate; the heating and cooling demand for a year was calculated using the Summer Design Year for London as the weather file. It was found that cooling demand is significantly reduced, heating demand is increased and the total energy savings vary between 1 and 8.5% relative to an albedo of 0.1 for the same conditions. In free floating (naturally ventilated) buildings summer comfort is improved but there is a penalty of increased heating energy during the winter. Thermal comfort can be improved by an average of 2.5 o C (operative temperature difference for a change of 0.5 in albedo) but heating demand could be increased by 10% for a ventilation rate of 2 air changes per hour. The results indicate that in the case of temperate climates the type, operation and thermal characteristics of the building should be considered carefully to determine potential benefits of the application of cool roof technology. For the examined case-study, it was found that a roof reflecticity of 0.6-0.7 is the 2 optimum value to achieve energy savings in a cooled office, improve summer internal thermal conditions in a non-cooled office (albeit with some heating energy penalty). It indicates that it is a suitable strategy for refurbishment of existing offices to improve energy efficiency or internal environmental conditions in the summer and should be considered in the design of new offices together with other passive energy efficient strategies.

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“…A modelling study [10] has shown the benefits in retail store at different climates. Cool Roofs have also been studied in experimental facilities; [11,12].…”

Section: Introductionmentioning

confidence: 99%

Cool roof technology in London: An experimental and modelling study

Kolokotroni

Gowreesunker

Giridharan

2013

Energy and Buildings

170

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“…Scale or size varies from as small as an actual shoe box size with dimension smaller than 1000mm [19,20,21,22], to medium size with dimensions between 1000 to 2000mm [23,24,25,26], and to large scales of more than 2000mm [27,28,29,30,31,32,33]. Most studies include multiple test cells starting by two [22], four [20,21,23,26,27,32] or more [25].…”

Section: Previous Studiesmentioning

confidence: 99%

“…Some choose random existing structures [33] with different configurations and construction, whereas, others make use of one surface with different alternations [29,30,31,34]. The observations can sometimes be for only short periods [19,21,24,25,26,31,33]. Researchers seldom study both walls and roofs simultaneously [32,33].…”

Section: Previous Studiesmentioning

confidence: 99%

The Rasmaska project: Temperature behaviour of three, full scale test cells in hot mediterranean summer: Non-insulated double masonry wall and different insulation locations

Saleh

Schiano-Phan

Gleeson

2018

Energy and Buildings

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“…This phenomenon, the urban heat island, has been recognized since the turn of this century and has been well documented [1][2][3]. Many measures against environmental problems are developed in buildings, such as restricted use of indoor air conditioning, using high performance thermal insulating building materials, increasing building and peripheral greening and, hoping to reduce and mitigate the deterioration of living environment [4][5][6][7][8]. The thermal characteristics of paved surfaces interacting with solar radiation are among a number of causal factors affecting urban heat island, which also include the population and population density of the urban area, building materials, spacing and height of buildings, waste heat generated by building equipment, as well as vegetative cover, geographic location [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

A Study of Reflectance of Sandblasted Tile with Different Colors

Bin-Feng¹,

Soen-Han²,

Yu-Hsin³

2015

Proceedings of the AASRI International Conference on Industrial Electronics and Applications (2015)

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This study discussed the reflectance of outdoor compressed concrete paving units. The research samples were basic square ground tiles, including sandblasted tiles with secondary treatment of surface, iridescent crystal sandblasted tiles mixed with waste glass, and rustic tiles. The ASTM E1918A method lately developed by the U.S. Lawrence Livermore National Laboratory (LLNL) was used for measurement. The measurement samples were square ground tiles in length and width of 20CM. The weather on the day was sunny, and the sunshine amount was greater than 800wa/m 2. The measurement site was the top of the 7th story of research building of Kuang-Fu Campus, National Cheng Kung University, Tainan City. The measurement environment avoided plants, buildings and persons shielding the samples, to avoid the measurement process being disturbed. This study suggests that in order to reduce the urban heat island effect, the white flat tiles without special treatment can be selected as the material for urban outdoor pavement design. Thus, the carbon emission from special treatment can be reduced, and a good reflectance effectiveness can be obtained.

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Study on the influence of albedo on building heat environment in a year-round

Cited by 18 publications

References 11 publications

Cool roof technology in London: An experimental and modelling study

Cool roof technology in London: An experimental and modelling study

The Rasmaska project: Temperature behaviour of three, full scale test cells in hot mediterranean summer: Non-insulated double masonry wall and different insulation locations

A Study of Reflectance of Sandblasted Tile with Different Colors

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