Phase-changing materials for thermal stabilization and thermal transport

Krašna, Marjan; Klemenčič, Eva; Kutnjak, Zdravko; Kralj, Samo

doi:10.1016/j.energy.2018.08.027

Cited by 16 publications

(5 citation statements)

References 18 publications

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“…The EC responsivity is an order of magnitude higher than the average EC responsivity in relaxor ferroelectrics. The phase-changing LC materials with large latent heat are thus an excellent candidate for thermal stabilization and thermal transport applications [45]. As fluids, they can also play a role of an EC active regeneration material which can reduce the passive mass in cooling devices employing the regeneration technique [11,19].…”

Section: Discussionmentioning

confidence: 99%

Caloric effects in liquid crystal-based soft materials

Črešnar,

Derets,

Trček

et al. 2023

J. Phys. Energy

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With the increased environmental awareness, the search for environmentally friendlier heat-management techniques has been the topic of many scientific studies. The caloric materials with large caloric effects, such as the electrocaloric (EC) and elastocaloric (eC) effects, have increased interest due to their potential to realize new solid-state refrigeration devices. Recently, caloric properties of soft materials, such as liquid crystals (LCs) and liquid crystal elastomers (LCEs), are getting more in the focus of caloric materials investigations, stimulated by large caloric effects observed in these materials. Here, an overview of recent direct measurements of large caloric effects in smectic LC 14CB and main-chain LCEs is given. Specifically, high-resolution thermometric measurements revealed a large EC response in 14CB LC exceeding 8 K. Such a large effect was obtained at a relatively moderate electric field of 30 kV/cm compared to solid electrocaloric materials. We demonstrate that such a small field can induce the isotropic to smectic A phase transition in 14CB, releasing or absorbing relatively large latent heat that enhances the EC response. Furthermore, it is demonstrated that in main-chain LCEs, the character of the nematic to isotropic transition can be tuned from the supercritical towards the first-order regime by decreasing the crosslinkers' density. Such tuning results in a sharper phase transition and latent heat that enhance the elastocaloric response, exceeding 2 K and with the eC responsivity of 24 K/MPa, about three orders of magnitude larger than the average eC responsivity found in the best shape memory alloys. Significant caloric effects in soft liquid crystal-based materials, observed at much smaller fields than in solid caloric materials, demonstrate their ability to play an important role as new cooling elements, thermal diodes, and caloric-active regeneration material in new heat-management devices.

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Section: Discussionmentioning

confidence: 99%

Caloric effects in liquid crystal-based soft materials

Črešnar,

Derets,

Trček

et al. 2023

J. Phys. Energy

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“…[14] Performance simulation based on Building Information Modeling (BIM) is studied to consider environmental friendliness and economic feasibility of target building and to guide program design decision. [15] Combining BIM simulation technology and value engineering, relationship between cost and energy efficiency in process of residential building design is analyzed, and BIM information model is used as a carrier to analyze and compare performance differences of different schemes based on BIM performance simulation to explore design strategies to obtain a comprehensive balance between green building assessment and cost control requirements. [16] Exploring sustainable design assessment of building projects in conceptual design stage through BIM-LEED application.…”

Section: Related Workmentioning

confidence: 99%

Performance Analysis of Application of BIM Technology and Two-Way Progressive Optimization Algorithm in Energy-Saving Design of Residential Buildings Based on BIM Technology

Gong

2024

jes

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The current residential energy-saving design is lagging behind, and lack of systematic design methods and scientific technical means seriously restricts process of improving quality of residential buildings in China. With development and application of digital information technology in construction field, BIM technology has brought new opportunities construction industry, and building performance data has become information basis for scientific promotion of energy conservation. This paper uses BIM technology as a platform to establish an information base of common building materials and components in Chongqing through literature research, field studies, summarization, and application practice, and to help architects make wise decisions at early design stage by using "one-click" scheme comparison and design evaluation to avoid a large number of potential energy consumption problems at a later stage, It greatly improves energy efficiency and design quality of buildings.

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“…Obviously, the most valuable and promising materials are based on latent thermal storage using phase change materials (PCMs) [6][7][8], which have a high heat storage density and constant temperature during the charge/discharge process [9,10]. Compared with hydrated salt and their mixture, molten salt is more attractive with the advantages of low subcooling, high melting temperature and high phase stability, which offer more potential for applications in solar thermal uses, waste heat recovery, steam production and so on [11,12].…”

Section: Introductionmentioning

confidence: 99%

In-Situ Reaction Method to Synthetize Constant Solid-State Composites as Phase Change Materials for Thermal Energy Storage

Yang

Liu

et al. 2021

Materials

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The encapsulation and heat conduction of molten salt are very important for its application in heat storage systems. The general practice is to solidify molten salt with ceramic substrate and enhance heat conduction with carbon materials, but the cycle stability is not ideal. For this reason, it is of practical significance to study heat storage materials with a carbon-free thermal conductive adsorption framework. In this paper, the in-situ reaction method was employed to synthetize the constant solid-state composites for high-temperature thermal energy storage. AlN is hydrolyzed and calcined to form h-Al2O3 with a mesoporous structure to prevent the leakage of molten eutectic salt at high temperature. Its excellent thermal conductivity simultaneously improves the thermal conductivity of the composites. It is found that 15CPCMs prepared with 15% water addition have the best thermal conductivity (4.928 W/m·K) and mechanical strength (30.2 MPa). The enthalpy and the thermal storage density of 15CPCMs are 201.4 J/g and 1113.6 J/g, respectively. Due to the excellent leak-proof ability and lack of carbon materials, the 15CPCMs can maintain almost no mass loss after 50 cycles. These results indicate that 15CPCMs have promising prospects in thermal storage applications.

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Phase-changing materials for thermal stabilization and thermal transport

Cited by 16 publications

References 18 publications

Caloric effects in liquid crystal-based soft materials

Caloric effects in liquid crystal-based soft materials

Performance Analysis of Application of BIM Technology and Two-Way Progressive Optimization Algorithm in Energy-Saving Design of Residential Buildings Based on BIM Technology

In-Situ Reaction Method to Synthetize Constant Solid-State Composites as Phase Change Materials for Thermal Energy Storage

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