Development of PCM cool roof system to control urban heat island considering temperate climatic conditions

Chung, Min Hee; Park, Jin Chul

doi:10.1016/j.enbuild.2015.12.056

Cited by 75 publications

(25 citation statements)

References 24 publications

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“…Further, 23 August was a cloudy day; hence, comprehensive experimental analyses were conducted on 24 August. The accumulated solar irradiation was 4632 Wh/m 2 , which is higher than the average summer solar irradiation of 3709 Wh/m 2 [10]. We assumed that the thermal plates were placed on the roof of the existing building, as shown in Figure 6.…”

Section: Results With Respect To the Melting Temperature Of The Phasementioning

confidence: 99%

“…Energies 2017, 10,195 7 of 12 the phase-change temperature. Consequently, the nighttime temperature of RT 25 was higher than those of the other PCMs.…”

Section: Results With Respect To the Melting Temperature Of The Phasementioning

confidence: 99%

“…Santamouris et al [9] examined coatings developed with infrared reflective pigments doped with PCM. Chung and Park [10] proposed the use of PCM tiles covered with shape-stabilized PCM and demonstrated that the incident irradiation on a roof with a PCM layer can be utilized to reduce internal heat flow from the roof to mitigate the urban heat island effect. These studies, similar to most in the relevant literature, have investigated and advocated the integration of PCMs in roof layers.…”

Section: Experimental Materialsmentioning

confidence: 99%

“…Recently, the use of phase-change materials (PCMs) in building components, such as walls [1][2][3], roofs [4][5][6][7][8][9][10], windows [11][12][13], and floors [14][15][16][17], has grown. PCMs function as thermal storage materials that can absorb or release heat during liquefaction or solidification at their phase-change temperatures.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study on the Thermal Performance of Phase-Change Material and Wood-Plastic Composites for Building Roofs

Chung

Park

2017

Energies

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Abstract:We assessed the usefulness of phase-change material (PCM)-based thermal plates fabricated from wood-plastic composites (WPCs) in mitigating the urban heat island effect. The thermal performance of plates containing PCMs with two different melting temperatures and with two different albedo levels was evaluated. The results showed that the PCM with a melting temperature of 44 • C maintained lower surface and inner temperatures than the PCM with a melting temperature of 25 • C. Moreover, a higher surface albedo resulted in a lower surface temperature. However, the thermal performance of PCMs with different melting temperatures but the same surface albedo did not differ. Using PCM-based materials in roof finishing materials can reduce surface temperatures and improve thermal comfort.

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Section: Results With Respect To the Melting Temperature Of The Phasementioning

confidence: 99%

“…Energies 2017, 10,195 7 of 12 the phase-change temperature. Consequently, the nighttime temperature of RT 25 was higher than those of the other PCMs.…”

Section: Results With Respect To the Melting Temperature Of The Phasementioning

confidence: 99%

Section: Experimental Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Experimental Study on the Thermal Performance of Phase-Change Material and Wood-Plastic Composites for Building Roofs

Chung

Park

2017

Energies

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“…The study of (Pisello et al, 2016) was aimed at the development and prototyping of a cool polyurethane-based membrane with PCM inclusion for roofing applications, whose relevant thermophysical properties were assessed by laboratory analyses. In (Chung & Park, 2016) a PCM cool roof system was created using PCM doped tiles; experimental results showed that such tiles, in summer weather conditions, allow a decrease of surface temperature while keeping low the temperature in the room below.…”

Section: Phase Change Materials and Their Coupling With Cool Roof Surmentioning

confidence: 99%

Coupling of Solar Reflective Cool Roofing Solutions with Sub-Surface Phase Change Materials (PCM) to Avoid Condensation and Biological Growth

Muscio

2016

ESSD

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Cool roofs are effective solutions to counter the overheating of building roofs, inhabited spaces below and urban areas in which buildings are located thanks to their capability of reflecting solar radiation. Nonetheless, the relatively low surface temperatures that they induce can cause condensation of humidity and leave the surface wetted for large part of the day, thus promoting the growth of bacteria, algae and other biological fouling; this can cause a quick decay of the solar reflective performance. Biological growth is countered by surface treatments, which, however, may be toxic and forbidden in many countries and may also vanish quickly. It can also be countered by lowering the thermal emittance and thus decreasing heat transfer by infrared radiation to the sky and the consequent night undercooling, but this can decrease the performance of cool roofs. An alternative approach, which is analyzed in this work, is to embed in the first layer below the cool roof surface a phase change material (PCM) that absorbs heat during the daytime and then releases it in the nighttime. This can increase the minimum surface temperatures, thus reducing the occurrence humidity condensation and also the biological growth. In this work, preliminary results on the coupling of a cool roof surface with a PCM sublayer are presented, being obtained by theoretical investigation on commercial materials and taking into account the time evolution pattern of the environmental conditions.

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Optimal roof structure with multilayer cooling function materials for building energy saving

et al. 2019

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Summary Both cool roof and phase change thermal storage are promising technologies in decreasing building energy consumption. Combining these two technologies is likely to further enhance the thermal comfort of the building as well as reduce air condition loads. In this paper, the cooling performance and energy‐saving effects of four types of roof (normal roof, phase change material [PCM] roof, cool roof, and cool PCM roof [cool roof coupled with PCM]) were investigated under a simulated sunlight. Experimental results indicate that compared with normal roof, the other three roofs are able to narrow the indoor temperature fluctuation and decrease the heat flow entering into the room. Among them, cool PCM roof gave the best energy‐saving effect that can lower the indoor temperature and heat entering into rooms by 6.6°C and 52.9%, respectively. Besides, the PCM location, PCM thickness, and insulation thickness exerted great impacts on the cooling performance of the roof. Placing the PCM on the internal layer beneath the extruded polystyrene (XPS) insulation board can make the indoor temperature 1.2°C lower than that on the middle layer. Although thicker PCM panels or insulation boards can provide a better thermal insulation, 5 mm in PCM thickness and 20 mm in insulation thickness are enough to guarantee the indoor temperature of cool PCM roof system at a comfortable range (22°C‐28°C) for a whole day. These findings will give guidance in designing buildings with a light and compact roof structure to decrease energy consumption and improve comfort level.

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Development of PCM cool roof system to control urban heat island considering temperate climatic conditions

Cited by 75 publications

References 24 publications

An Experimental Study on the Thermal Performance of Phase-Change Material and Wood-Plastic Composites for Building Roofs

An Experimental Study on the Thermal Performance of Phase-Change Material and Wood-Plastic Composites for Building Roofs

Coupling of Solar Reflective Cool Roofing Solutions with Sub-Surface Phase Change Materials (PCM) to Avoid Condensation and Biological Growth

Optimal roof structure with multilayer cooling function materials for building energy saving

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