Effect of Phase Change Materials on Time Lag, Decrement Factor and Heat-Saving

Bilgin, Feyza; Arıcı, Müslüm

doi:10.12693/aphyspola.132.1102

Cited by 13 publications

(2 citation statements)

References 19 publications

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“…A recent study in 2017, indicated that the employment of phase change materials in walls of a building has a pronounced effect on the time lag and the decrement factor. It is concluded that a significant amount of heating energy can be saved, and thermal comfort can be considerably enhanced, by incorporating phase change materials into external walls (Bilgin and Arici 2017).…”

Section: Previous Studies On Df Tdr and Tgmentioning

confidence: 99%

Thermal performance of insulated concrete block in Sharjah, United Arab Emirates (UAE): continuous monitoring and IR assessment

Taleb

AlShuhail

2020

Journal of Asian Architecture and Building Engineering

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Among the popular construction materials used in the UAE are Insulated Concrete Blocks (ICB). This block is a combination of a unique block design and insulating inserts that enable this block to be highly energy efficient. This paper aims at investigating the thermal performance of this block during different climatic seasons. An experimental model was constructed in the emirate of Sharjah, mainly using this block. Its thermal behaviour was thoroughly studied over the course of one year by using Continuous Method (CM) and the Infrared Technique (IR) method. The main thermal parameters were focused on the Decrement Factor (DF), the Temperature Differences Ratio (TDR) and the Time Lag (Tg). It was found that the ICB does not perform similarly in all seasons, and/or in all orientations. The results show that ICB will perform best in Autumn with an average DF of 0.23, and with an average TDR of 0.56. The biggest value in terms of the Tg is found in Spring with 14.85h. Wind fluctuations can also affect these three parameters. In addition to wind, rain also affects the thermal performance of the ICB. Calibration between the CM and IR methods will be discussed, and detailed analysis will be provided.

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Section: Previous Studies On Df Tdr and Tgmentioning

confidence: 99%

Thermal performance of insulated concrete block in Sharjah, United Arab Emirates (UAE): continuous monitoring and IR assessment

Taleb

AlShuhail

2020

Journal of Asian Architecture and Building Engineering

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“…Thongtha et al [10] reported that the time lag is directly proportional to the wall thickness, while the decrement factor is inversely proportional to the wall thickness. Bilgin and Arici [11] found through a simulation model that for the PCM wall in Ankara, Turkey, TL increased from 5.64 to 16.11h, and DF decreased from 0.144 to 0.034. Kuznik et al [12] concluded that the PCM layer increases the TL by 1.66 hours.…”

Section: Introductionmentioning

confidence: 99%

Impact of phase change materials and brick thickness on thermal comfort in free-floating mode

El-Raheim

Mohamed²,

Fatouh³

et al. 2022

Engineering Research Journal

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In this paper, a simulation model is developed to predict the effects of phase change materials (PCMs) with different perforated brick thicknesses on the thermal comfort of heavy structural buildings in a free-floating mode under the hot-dry conditions. According to Egyptian building standards, a room with a floor area of 16m 2 and a height of 3m is simulated under Cairo (Egypt) weather conditions. Two PCMs with melting temperatures of 29 and 25C and perforated brick thicknesses of 10, 15, 20, 25, and 30 cm are used and evaluated in terms of the exceeding hours, the time lag, and the decrement factor. The simulation model is validated using data reported in the literature for an outdoor cubicle. The results confirmed that the installed PCM layer into the building envelope saves the building's usable area and reduces the initial cost of construction. When the PCM-29 layer is integrated with a 20 cm thick perforated brick, the maximum exceedance hours are reduced by nearly 620 hours compared to 10 cm brick thickness. Combining the PCM layer with the 10 cm thick perforated brick achieved the same exceeding (approximately 1383) hours as the 20 cm thick base case. Seasonal assessment of PCMs revealed that the best PCM behavior varies according to outdoor temperature fluctuations. PCM-25 produces better indoor operative temperature than PCM-29 in spring and vice versa in summer. As the perforated brick thickness increased from 10 cm to 30 cm, the charging time required to melt 5% PCM-25 increased from 3.5 hours to 22 hours. In addition, when the brick thickness is 15 cm, the maximum time lag difference of the PCM-25 layer is about 7.25h. In summer, PCM is most effective when the thickness of the perforated bricks is 20 cm.

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The Effect of Different Natural Porous Aggregates on Thermal Characteristic Feature in Cementitious Lightweight Mortars for Sustainable Buildings

Gündüz

KALKAN²

2022

Iran J Sci Technol Trans Civ Eng

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Effect of Phase Change Materials on Time Lag, Decrement Factor and Heat-Saving

Cited by 13 publications

References 19 publications

Thermal performance of insulated concrete block in Sharjah, United Arab Emirates (UAE): continuous monitoring and IR assessment

Thermal performance of insulated concrete block in Sharjah, United Arab Emirates (UAE): continuous monitoring and IR assessment

Impact of phase change materials and brick thickness on thermal comfort in free-floating mode

The Effect of Different Natural Porous Aggregates on Thermal Characteristic Feature in Cementitious Lightweight Mortars for Sustainable Buildings

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