Thermal management performance and mechanical properties of a novel cementitious composite containing fly ash/lauric acid-myristic acid as form-stable phase change material

Hekimoğlu, Gökhan; Nas, Memduh; Ouikhalfan, Mohammed; Sarı, Ahmet; Kurbetçi, Şirin; Tyagi, V.V.; Sharma, R. K.; Saleh, Tawfik A.

doi:10.1016/j.conbuildmat.2020.122105

Cited by 82 publications

(16 citation statements)

References 50 publications

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“…A sharp peak at 1701 cm −1 is attributed to characteristic stretching of the C═O present in COOH 18,19 . Series of peaks noted at 1430, 1293, 937, and 724 cm −1 are attributed to the stretching/bending vibrations of OH, CH, C═O, and CO groups of lauric acid 20‐22 …”

Section: Resultsmentioning

confidence: 99%

Curding of milk in incubator utilizing latent heat of lauric acid in winter

2021

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The maintenance of incubation temperature (30 C-50 C) for growth of culture is essential during fermentation of milk to curd. This report discusses the issue of maintaining constant temperature of milk for formation of curd using lauric acid (m.p. 45.02 C and f.p. 40.21 C) as phase change material (PCM). Lauric acid possesses phase transition enthalpy, 189.43 kJ kg À1 and was thermally stable till 140 C. A known dimension of a temperature controlling packaging (TCP) box was made by taking 240 g of PCM uniformly distributed inside six polyethylene packets (40 g each) of dimensions identical with that of inner walls of the corrugated box and the packets were placed along inner walls of TCP box. The TCP box containing packets with molten PCM could maintain the temperature of 150 g milk (placed inside box) in between 50 C and 30 C for 160 minutes and helped in curd formation, while the whole assembly was exposed to 1 C of ambient temperature.

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Section: Resultsmentioning

confidence: 99%

Curding of milk in incubator utilizing latent heat of lauric acid in winter

2021

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“…Portland cement is the most studied binder, but alkali-activated cements and geopolymers also seem to be considered as viable alternatives. No problems due to chemical or physical interactions between PCM and mortar/concrete emerged; nevertheless, the percentage of PCM must be limited (up to 20 wt% in the mortars), mainly to control the decrease in mechanical properties, such as compressive strength and flexural strength [ 82 , 84 , 85 , 86 , 87 ]. Instead, the decrease in the workability of fresh mortar/concrete is usually solved by adding more water in the initial mixing of the materials or by using a superplasticizer [ 81 , 84 , 88 , 89 ].…”

Section: Pcms’ Evolution In the Building Sectormentioning

confidence: 99%

Phase Change Material Evolution in Thermal Energy Storage Systems for the Building Sector, with a Focus on Ground-Coupled Heat Pumps

et al. 2022

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The building sector is responsible for a third of the global energy consumption and a quarter of greenhouse gas emissions. Phase change materials (PCMs) have shown high potential for latent thermal energy storage (LTES) through their integration in building materials, with the aim of enhancing the efficient use of energy. Although research on PCMs began decades ago, this technology is still far from being widespread. This work analyses the main contributions to the employment of PCMs in the building sector, to better understand the motivations behind the restricted employment of PCM-based LTES technologies. The main research and review studies are critically discussed, focusing on: strategies used to regulate indoor thermal conditions, the variation of mechanical properties in PCMs-based mortars and cements, and applications with ground-coupled heat pumps. The employment of materials obtained from wastes and natural sources was also taken in account as a possible key to developing composite materials with good performance and sustainability at the same time. As a result, the integration of PCMs in LTES is still in its early stages, but reveals high potential for employment in the building sector, thanks to the continuous design improvement and optimization driven by high-performance materials and a new way of coupling with tailored envelopes.

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“…Many scholars combined some lauric acid-based phase change materials with building materials by technical means to study the energy-saving effect of composite materials. For example, Hekimoğlu 26 added lauric acid–myristic acid fly ash/composite to standard cement mortar to prepare phase change cement and compared the thermal performance test with standard cement. The results show that the temperature of the phase change mortar is lower than that of the standard mortar during the heating process, and the prepared phase change mortar has a good energy-saving effect.…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties and Reliabilities of Lauric Acid-Based Binary Eutectic Fatty Acid as a Phase Change Material for Building Energy Conservation

et al. 2022

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Thermal properties, stability, and reliability of lauric acid-based binary eutectic mixtures for building energy efficiency were studied. The eutectic points and phase change performance of these binary PCMs were obtained as follows: (1) For lauric acid–myristic acid, the mass eutectic point is 70 wt % LA/30 wt % MA. (2) For lauric acid–palmitic acid, the eutectic point is 79 wt % LA/21 wt % PA. (3) For lauric acid–stearic acid, the eutectic point is 82 wt % LA/18 wt % SA. The eutectic PCMs have a melting enthalpy of 166.18, 183.07, and 189.50 J·g –1 and a melting temperature of 35.10, 37.15, and 39.29 °C for lauric–myristic acid, lauric–palmitic acid, and lauric–stearic acid binary eutectic PCMs, respectively. The experimental results are very close to the theoretical results. Moreover, from FT-IR and XRD investigations, we realized that during the preparation of the lauric acid-based binary eutectic fatty acids, no new functional groups were produced. Besides, the TG illustrated that the LA–MA eutectic PCMs, LA–PA eutectic PCMs, and LA–SA eutectic PCMs exhibit excellent thermal stability below 126.51, 135.7, and 110.08 °C, respectively. Finally, lauric acid-based binary eutectic PCMs still show excellent thermal properties and chemical structure after 500 hot and cold cycles. All in all, as a novel material for building energy conservation, lauric acid-based binary eutectic PCMs have broad prospects and good practicability.

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Thermal management performance and mechanical properties of a novel cementitious composite containing fly ash/lauric acid-myristic acid as form-stable phase change material

Cited by 82 publications

References 50 publications

Curding of milk in incubator utilizing latent heat of lauric acid in winter

Curding of milk in incubator utilizing latent heat of lauric acid in winter

Phase Change Material Evolution in Thermal Energy Storage Systems for the Building Sector, with a Focus on Ground-Coupled Heat Pumps

Thermal Properties and Reliabilities of Lauric Acid-Based Binary Eutectic Fatty Acid as a Phase Change Material for Building Energy Conservation

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