PCM cool roof systems for mitigating urban heat island - an experimental and numerical analysis

Yang, Young Kwon; Kim, Min Young; Chung, Min Hee; Park, Jin Chul

doi:10.1016/j.enbuild.2019.109537

Cited by 29 publications

(6 citation statements)

References 18 publications

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“…Similar results were proven using PCM-doped tiles for a cool roof system in simulated summer conditions [40]. In real winter conditions, the use of PCMs maintained a higher indoor temperature than cool paints, and with a low surface temperature reducing the heat penalty [43]. In this sense, several types of PCMs have been tested as dynamic components in buildings in comparison to conventional cool roof materials, showing that their incorporation in the roof materials matrix decreased the heat gain flux by 54%, and registered for various values of albedo compared to cool roof technology, and a lower sensible heat by 40% [16].…”

Section: Pcmssupporting

confidence: 68%

“…The implementation of PCMs in the matrix of roof finishing materials decreases the flux of the roof heat gain by 54%, compared to the cool roof [16], and it helps to compensate for the effect of the thermal stress generated by the latter [39]. Moreover, PCMs can be used to regulate the indoor thermal comfort and reduce the heating penalty during the summer and winter, respectively, more so than do cool paints [40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

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Cool Surface Strategies with an Emphasis on the Materials Dimension: A Review

et al. 2022

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The need to tackle the urban heat island effect demands the implementation of cool surfaces as a mitigation strategy. This study comprehensively reviews the evolution of this research field from a materials perspective. It provides a bibliometric analysis of the relevant literature using the SciMAT software processing of bibliographic records from 1995 to 2020, for the evolution of cool surfaces. The results obtained show an increased interest in the field from 2011 to 2020, particularly for roof applications, and present the scientific evolution of reflective materials. According to the materials dimension adopted by the development of the research field, the study is refined from a bibliometric analysis of 982 selected records for the analysis of five themes: (i) Pigments; (ii) Phase change materials; (iii) Retroreflective materials; (iv) Ceramic materials; and (v) Glass. These materials present promising results in terms of their solar reflectance performances in the mitigation of the urban heat island phenomenon. At the end of this review, recommendations for future studies are provided for the creation of economic and environmentally friendly materials based on waste glass recycling. This study represents a valuable contribution that provides a scientific background with regard to cool surfaces from a materials perspective for future investigations.

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Section: Pcmssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Cool Surface Strategies with an Emphasis on the Materials Dimension: A Review

et al. 2022

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“…This condition contributes to forming the phenomenon known as heat islands [194]. Several studies have analyzed and identified the causes and solutions to this phenomenon [195][196][197][198]. In addition to the positive effects on energy savings in buildings, cool roofs also contribute to reducing the formation of heat islands in urban areas [196].…”

Section: Cool Roof and Cool Wallsmentioning

confidence: 99%

Enhancement Techniques for the Reduction of Heating and Cooling Loads in Buildings: A Review

Ismail,

Lino,

Henriquez

et al. 2023

J Energ Power Technol

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The building sector is rated as a big consumer of electric energy and emissions, responsible for about 40% of final electric energy consumption. As a result, the Paris Agreement 2015 set a goal for buildings and the construction sector to reach a nearly zero-carbon stage by 2050. This urged most countries to create regulations for the construction sector and invest in energy efficiency programs. The present paper aims to present an updated review of building energy-saving solutions and techniques to contribute to carbon emission mitigation in the building sector. The high energy consumption of a building is mainly due to heating and cooling, which is directly related to the thermal properties of the materials used. Natural ventilation and illumination are other aspects that contribute to the high energy consumption. Considering these issues, the review covers energy-efficient construction materials such as mortars, concrete with PCM, new construction materials with PCM such as 3d printing concrete and geopolymer concrete, and bricks usually used in buildings. Also, the review covers the methods and solutions for energy saving for building heating and cooling. Since transparent windows and façades are essential for structures, their thermal and visual performance is crucial. Established and under-development techniques for windows and façades are presented and discussed. Walls and roofs are usually rated at the top of the weak barriers against a building's heat losses and energy gains. The present paper reviews existing and still under research and development techniques to improve the thermal performance of walls and roofs, such as cool roof and cool walls, walls and roofs with phase change materials (PCM), and ventilated walls and ceilings.Some authors’ comments are presented at the end of each topic. Some possible opportunities for future research and developments are also presented.

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“…Over the past few years, numerous articles have been dedicated to exploring the use of PCMs in construction and building materials [12][13][14]. More specifically, the ability to store and release large amounts of heat into PCMs mixed within insulating envelopes can effectively reduce the thermal conditioning load of the building [15][16][17][18][19][20][21][22][23][24]. In this context, a significant proportion of the research on PCMs focuses on their incorporation into porous cementitious or other binder-based composites (i.e., having a density <800 kg/m 3 ) to be 2 of 20 used for thermal insulation in nearly-zero-energy buildings (nZEB) [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Modelling Porous Cementitious Media with/without Integrated Latent Heat Storage: Application Scenario

Nazari Sam,

Schneider,

Lutze

2023

Energies

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This paper presents a methodological approach for the evaluation of the thermal behavior of cementitious porous media with/without integrated latent-heat thermal energy storage (LHTES). To achieve this goal, the Lewis-Nielsen model has been calibrated to predict the insulation properties of mineralized foamed concretes. Two pore-related microstructural fitting parameters, A and Φm, are presented according to the available data in the literature. In this regard, new findings are implemented for the classification of pore structure and prediction of the homogenized thermal conductivity of two-phase cementitious foams with or without phase change materials. The calibration and predictive analyses have been extended to a wide range of experimental data, including variation of binder types, porosities, and latent components. The presented analytical approach appears to agree well with experimental results and can be employed in the design of two-phase mineral foam materials. Then, to assess the thermal behavior of the predicted insulating envelopes, a one-dimensional (1D) enthalpy-based model is used which combines Fourier’s law of heat conduction, the first law of thermodynamics, Lewis-Nielsen conductivities, and the mixture theory for LHTES additions. The results demonstrated the importance of volumetric heat capacity for the thermal inertia of building envelopes.

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PCM cool roof systems for mitigating urban heat island - an experimental and numerical analysis

Cited by 29 publications

References 18 publications

Cool Surface Strategies with an Emphasis on the Materials Dimension: A Review

Cool Surface Strategies with an Emphasis on the Materials Dimension: A Review

Enhancement Techniques for the Reduction of Heating and Cooling Loads in Buildings: A Review

Modelling Porous Cementitious Media with/without Integrated Latent Heat Storage: Application Scenario

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