Hydrological properties and solar evaporative cooling performance of porous clay tiles

Zhang, Lei; Pan, Zhenhao; Meng, Qinglin; Feng, Yanshan; Chen, Yuanrui

doi:10.1016/j.conbuildmat.2017.06.059

Cited by 20 publications

(6 citation statements)

References 28 publications

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“…Evaporative cooling based on the liquid‐vapor phase change of water 20,21 is a promising alternative to air conditioners owing to its super high enthalpy, that is, ~2450 J/g. For example, a technique used worldwide to cool high‐temperature roads is spraying water for surface cooling 22,23 .…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, developing highefficiency, environmentally friendly, and sustainable cooling strategies have become attractive for improving the working efficiency of buildings, data centers, and photovoltaics (PVs), and reducing carbon emissions, while meeting ever-increasing energy demands. 15,[17][18][19] Evaporative cooling based on the liquid-vapor phase change of water 20,21 is a promising alternative to air conditioners owing to its super high enthalpy, that is, ~2450 J/g. For example, a technique used worldwide to cool high-temperature roads is spraying water for surface cooling.…”

Section: Introductionmentioning

confidence: 99%

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High‐performance and wide relative humidity passive evaporative cooling utilizing atmospheric water

Guang

Qiu

et al. 2022

Droplet

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Global warming and increased living standards have rapidly increased the demand for cooling systems. Meeting this demand in less economically developed areas is highly challenging due to a lack of electricity. In this paper, we have demonstrated a high-performance and wide relative humidity (RH) solar-driven evaporative cooling strategy that uses only atmospheric water. Developed here for the first time, we designed a metal-organic framework (MOF-801) based composite with a high-performance atmospheric water absorption across a wide range of RH. The as-synthesized composite can adsorb atmospheric water up to ~22% (~80%) of its weight at an RH@28% (~70%). Our demonstration has shown that the corresponding cooling powers range from 136 to 344 W/m 2 in a wide range of RH and solar intensities, and the passive cooling temperature is up to 14°C lower than the device's reference counterpart. Our study thus proposes a solar-driven cooling coating with high cooling powers across a wide range of RH based on an as-synthesized composite, which pinpoints a pathway to replace traditional compression-based cooling systems (e.g., air conditioners) and which will also have a significant impact in future global energy consumption.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐performance and wide relative humidity passive evaporative cooling utilizing atmospheric water

Guang

Qiu

et al. 2022

Droplet

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“…The brick powder of clay courts dries quickly due to climatic factors such as solar radiation, vapor pressure deficit, air temperature, wind speed etc [ 5 , 6 ]. Thus, the court needs to receive constant and uniform hydration, otherwise cracks will be generated on its surface, enabling the growth of vegetation and reducing its quality and useful life.…”

Section: Introductionmentioning

confidence: 99%

Proposition of irrigation system for wetting the clay surface of tennis courts

et al. 2022

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The key to maintaining a clay court with quality and lastingly is through water applications, carried out periodically and through systems with high distribution uniformity, developed specifically for this purpose. The objective in this study was to evaluate the performance of a sprinkler irrigation system with hose and shower, traditionally used in clay tennis court, and propose another low-cost system that is operational and technically feasible, which is the irrigating bar. For each irrigation system, three evaluations were performed. At the beginning of each test, the pressures and flow rates of the emitters were measured, and the water distribution profile method was used to determine the distribution uniformity of the systems. Distribution efficiency was obtained through the Christiansen’s (UC), distribution (UD), absolute (UA), statistical (US) and Hart’s (UH) uniformity coefficients, HSPA standard efficiency (UHSPA) and, coefficient of variation (CV). Subsequently, the application and irrigation efficiencies were calculated. It was found that the irrigation bar required lower operating pressure, as well as greater stability of pressure and flow in relation to the hose system. Water losses in the hose/shower system (22.0%) were higher than in the irrigation bar (0.6%). Regardless of the evaluated system, UC (68.4% and 86.5%) and UH (66.4% and 87.5%) values were similar and higher than those of the other coefficients (~51.8% and ~81.2%). The collected depths, applied by the hose/shower irrigation system, showed high spatial variability and, consequently, low values of uniformity, being classified as poor or unacceptable. The irrigating bar promoted higher values of uniformity coefficients, being classified as good. Irrigation efficiencies were 53.97 and 85.97% for hose/shower and irrigation bar systems, respectively. The hose/shower system has low performance in the irrigation of clay tennis courts. The irrigation bar system, for providing technical, operational, and economic benefits, and has the potential to be used in the irrigation of clay tennis courts.

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“…Zhang et al (2015) analisaram comparativamente a economia de energia proporcionada por uma parede com azulejos porosos em uma cidade chinesa, concluindo que a utilização dessa técnica passiva representou uma diminuição entre 35-68% do consumo de energia para condicionamento de ar. Zhang et al (2017), ao analisarem o resfriamento evaporativo de tijolos porosos de cerâmica, verificaram que, embora a absortância do tijolo úmido seja maior do que a do material seco, 80% da radiação absorvida foi transformada em calor latente de evaporação, o que reduziu a temperatura superficial em 11 ºC e o fluxo de calor em 67,7%. Com os resultados obtidos, os autores ajustaram uma curva linear de decréscimo da refletância solar com o aumento da massa de água absorvida, com coeficiente de determinação de 0,87.…”

Section: Introductionunclassified

Influência Da Saturação Nas Propriedades Térmicas E Óticas De Materiais Porosos Utilizados Em Coberturas

Ramos¹,

Neto²,

Silva³

et al. 2020

Encontro Nacional De Tecnologia Do Ambiente Construído

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Diversas publicações indicam um potencial de redução de carga térmica de resfriamento por meio da aplicação de resfriamento evaporativo na cobertura de edificações. Tal processo consiste na dissipação do calor absorvido na forma de calor latente, por meio da evaporação da água contida em materiais porosos. Porém, a absorção de água nos materiais porosos causa uma alteração nas propriedades térmicas e óticas desses materiais, relacionadas a absorção de calor. Tais alterações podem reduzir as vantagens da utilização do resfriamento evaporativo em coberturas. Visando avaliar mais precisamente as variações dessas propriedades, foram medidas as emitâncias, refletâncias e SRIs de telhas porosas de cerâmica e fibrocimento, usualmente aplicadas no mercado de construção civil brasileiro, nas condições seca e saturada. De maneira geral, verificou-se um aumento na emitância e uma redução na refletância com a saturação, em todas as amostras avaliadas. Desta forma, com os resultados apresentados, novas pesquisas sobre este tema podem se utilizar de valores mais precisos em suas estimativas, implicando, por exemplo, em simulações computacionais mais robustas.

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Hydrological properties and solar evaporative cooling performance of porous clay tiles

Cited by 20 publications

References 28 publications

High‐performance and wide relative humidity passive evaporative cooling utilizing atmospheric water

High‐performance and wide relative humidity passive evaporative cooling utilizing atmospheric water

Proposition of irrigation system for wetting the clay surface of tennis courts

Influência Da Saturação Nas Propriedades Térmicas E Óticas De Materiais Porosos Utilizados Em Coberturas

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