Impacts of the water absorption capability on the evaporative cooling effect of pervious paving materials

Wang, Junsong; Meng, Qinglin; Zhang, Lei; Zhang, Yu; He, Bao‐Jie; Zheng, Senlin; Santamouris, M.

doi:10.1016/j.buildenv.2019.01.033

Cited by 83 publications

(22 citation statements)

References 35 publications

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“…Different cooling pads were evaluated regarding cooling efficiency, such as jute, luffa fibers, and palm fibers [16]; coarse and fine polyvinyl carbonate [17]; rice straw and palm leaf fibers [18]; and CELdek ® , straw, and slice wood [19]. Additionally, several researchers have discussed the main factors when testing a cooling pad, such as surface area, thickness, and type and size of its perforations [20][21][22]. Some researchers also further discussed the decrease in electricity consumption by natural draught without the use of a blower [23].…”

Section: Figurementioning

confidence: 99%

Adaption of an Evaporative Desert Cooler into a Liquid Desiccant Air Conditioner: Experimental and Numerical Analysis

2019

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Desert coolers have attracted much attention as an alternative to mechanical air conditioning systems, as they are proving to be of lower initial cost and significantly lower operating cost. However, the uncontrolled increase in the moisture content of the supply air is still a great issue for indoor air quality and human thermal comfort concerns. This paper represents an experimental and numerical investigation of a modified desert air cooler into a liquid desiccant air conditioner (LDAC). An experimental setup was established to explore the supply air properties for an adapted commercial desert cooler. Several experiments were performed for air-water and air-desiccant as flow media, at several solutions to air mass ratios. Furthermore, the experimental results were compared with the result of a numerical simplified effectiveness model. The outcomes indicate a sharp reduction in the air humidity ratio by applying the desiccant solutions up to 5.57 g/kg and up to 4.15 g/kg, corresponding to dew point temperatures of 9.5 • C and 12.4 • C for LiCl and CaCl 2 , respectively. Additionally, the experimental and the numerical results concurred having shown the same pattern, with a maximal deviation of about 18% within the experimental uncertainties.

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Section: Figurementioning

confidence: 99%

Adaption of an Evaporative Desert Cooler into a Liquid Desiccant Air Conditioner: Experimental and Numerical Analysis

2019

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“…There are two broad types of UHI, namely Surface Urban Heat Island (SUHI) and Atmospheric Urban Heat Island (AUHI). The differences within these types have to do with how they are formed, their impacts, and techniques used for identification and quantification [31]. An increase in urban surface temperatures creates the SUHI that is present all day and night and is most intense during the summer.…”

Section: Introductionmentioning

confidence: 99%

“…Atmospheric processes in an urban area is studied within the defined climatic scales and vertical layers (Figure 1). On the horizontal scale, we can distinguish microscale or street canyon scale, local scale or neighborhood scale, mesoscale or city-scale [31,38]. Due to the air turbulence, an increase in spatial scale decreases the temperature difference between UCL and UBL layers [34].…”

Section: Introductionmentioning

confidence: 99%

“…To enhance the understanding of the impact of water absorption on the evaporative cooling effect of pavement, Wang et al [127] used similar colored pavement materials with different pore sizes and geometry and similar hydrophilicity. They tested three pavement materials such as sintered ceramic pervious brick (CB), pervious concrete brick (PB), and open-graded pervious concrete (PC).…”

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confidence: 99%

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Urban Heat Island: Causes, Consequences, and Mitigation Measures with Emphasis on Reflective and Permeable Pavements

et al. 2021

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Economic and social development of urban and rural areas continues in parallel with the increase of the human population, especially in developing countries, which leads to sustained expansion of impervious surface areas, particularly paved surfaces. The conversion of pervious surfaces to impervious surfaces significantly modifies local energy balance in urban areas and contributes to urban heat island (UHI) formation, mainly in densely developed cities. This paper represents a literature review on the causes and consequences of the UHI and potential measures that could be adopted to improve the urban microclimate. The primary focus is to discuss and summarise significant findings on the UHI phenomenon and its consequences, such as the impact on human thermal comfort and health, energy consumption, air pollution, and surface water quality deterioration. Regarding the measures to mitigate UHI, particular emphasis is given to the reflective and permeable pavements.

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“…The re ectance of a pavement can be increased by coating the pavement surface with highly re ectance pigment (Feng, Zhong et al 2012), sealing the pavement with light-colored layers (Tran, Powell et al 2009), and others (Levinson and Akbari 2002). Increasing the cooling capacity of a pavement can be achieved by developing water-retaining pavements to hold water at the surface layer for subsequent evaporative cooling (Bao, Liu et al 2019, Wang, Meng et al 2019. Pavement temperature can be also reduced by harvesting the heat of a pavement for sustainable usages, and by embedding phase-change materials in a pavement to convert the absorbed heat to latent heat rather than sensible heat (Bo, Biao et al 2011, Jiang, Jin et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the thermal characteristics of urban mockups with different paved streets

Qin

Wei

Wang

et al. 2021

Environ Sci Pollut Res

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Pavements in urban area absorb more sunlight due to the canyon-like geomorphology of the urban geometry, and store more heat due to the great thermal bulk properties of concrete. Heat released from pavements warms up the urban air, contributing to the urban heat island. Recently, the uses of cool pavements to reduce the pavement temperature as an urban heat island mitigation have gained momentum. Understanding the temperature and solar insolation of a pavement in an urban area is important to adopt the right cool pavement option for the right place. This study measured the temperature of paved streets in an urban mockup for four days in summer. It is found that east-west (EW) streets are the hottest place in an urban area, followed by the intersection, and nally the south-north (SN) street; and that increasing the pavements albedo reduces the pavement temperature effectively. The dark grey pavement in open space is hotter than those in an urban canyon. The heat storage in the building blocks keeps the pavement warmer more than 2 o C at nightime. The EW street is exposed to solar insolation for long hours, so it is suitable for preferentially developing of re ective cool pavements.

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Impacts of the water absorption capability on the evaporative cooling effect of pervious paving materials

Cited by 83 publications

References 35 publications

Adaption of an Evaporative Desert Cooler into a Liquid Desiccant Air Conditioner: Experimental and Numerical Analysis

Adaption of an Evaporative Desert Cooler into a Liquid Desiccant Air Conditioner: Experimental and Numerical Analysis

Urban Heat Island: Causes, Consequences, and Mitigation Measures with Emphasis on Reflective and Permeable Pavements

Experimental study on the thermal characteristics of urban mockups with different paved streets

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