Modeling of heat capacity peaks and enthalpy jumps of phase-change materials used for thermal energy storage
TL;DR: In this article, three phase-change materials (PCMs) in which a change between two phases may be used to store/release thermal energy were measured in a quasistatic regime by adiabatic scanning calorimetry and showed, within a certain temperature range, a single distinct jump and peak.
About: This article is published in International Journal of Heat and Mass Transfer.The article was published on 2017-04-01. It has received 32 citations till now. The article focuses on the topics: Volumetric heat capacity & Enthalpy of fusion.
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TL;DR: In this article, a novel polymeric solid-solid phase change materials (SSPCMs) were prepared through solvent-free bulk polymerization by employing polyethylene glycol (PEG) as phase change functional segments, diphenylmethane diisocyanate (MDI) as coupling agent and xylitol as curing agent.
45 citations
TL;DR: In this paper, a physical model for heat transfer in a construction material integrating microencapsulated phase change material (PCM) has been studied and analyzed using the apparent heat capacity approach.
Abstract: In this research, heat transfer in a construction material integrating microencapsulated phase change material (PCM) has been studied and analyzed using a physical model based on the apparent heat capacity approach. The PCM considered includes impurities and behaves like a binary solution. The physical model was validated with the experimental and numerical data from literature. The numerical and experimental results revealed that the fusion and freezing operations were asymmetrical. The impact of the scan rate, the melting temperature, the volume fraction of the PCM and the thickness of the composite material on the phase transition process has been examined and outlined.
41 citations
TL;DR: This study presents a procedure of verification and validation of PCM models for building’s envelopes developed in Modelica employing an approach similar to ASHRAE Standard 140, consisting of empirical validation, analytical verification, and comparative testing.
29 citations
TL;DR: A detailed review for the applications of phase change materials (PCMs) in residential heating identifies potential energy management opportunities that can significantly reduce the authors' reliance on fossil fuels.
Abstract: The aim of this paper is providing a detailed review for the applications of phase change materials (PCMs) in residential heating. The study focuses mainly on its use in domestic water heating systems. Different studies accounting for structural characterization, research methodology, and long term performance were carefully assessed. The gaps in the literature have been highlighted and recommendations for future studies have been presented. The technical gaps urge the need for research to be directed towards enhancing PCM properties in the domestic system, novel integration of PCM within the system, and optimization of system performance based on real-time accurate weather data. The economic opportunities for such systems were presented in different locations of the world by investigating different energy efficiency measures. The work presented herein identifies potential energy management opportunities that can significantly reduce our reliance on fossil fuels. Consequently, promoting a green future and mitigating greenhouse gas emissions. It is structured to provide guidance for researchers and engineers working in inclusion of PCMs in residential heating applications.
28 citations
TL;DR: In this article, the authors developed a simplified model for investigating numerically a Li-Ion battery pack storage with phase change material (PCM), which is based on the energy balances for the battery cells and the PCM with a heat generation source.
Abstract: The present work is aimed at developing a simplified model for investigating numerically a Li-Ion battery pack storage with phase change material (PCM). The developed model is based on the energy balances for the battery cells and the PCM with a heat generation source. To simulate the phase transition phenomena in the PCM, the PCM specific heat capacity is expressed as a temperature-dependent function. The verification of the proposed model is carried out by comparing the numerical results with the experimental data from the literature and the maximum relative error obtained is approximately 6%. With the help of the validated model, the battery pack is explored during both charge and discharge cycles and the effect of various design and operating parameters on the battery temperature is reported and discussed. Results show that the use of PCM in the battery pack is appropriate and reduces the maximum battery temperature by up to 3 °C compared to a battery pack without PCM. Improving the airflow around the storage system can significantly increase the thermal management performance of the PCM and reduce the maximum temperature of the batteries by up to 2.5 °C. It has been also shown that PCM A-32 H is suitable for the battery pack than PCMs RT-31, RT-35 HC and A-36 due to its transition temperature and to its high latent heat of fusion. Eventually, the fast and simplified thermal model can be employed by battery pack designers to explore and optimize the thermal management system of the PCM with reasonable accuracy.
23 citations
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TL;DR: A review of the latest publications on the use of phase change materials (PCM) in buildings is presented in this article, where the authors present a classification of materials, materials available and problems and possible solutions on the application of such materials in buildings.
Abstract: In recent years the use of thermal energy storage with phase change materials has become a topic with a lot of interest within the research community, but also within architects and engineers. Many publications have appeared, and several books, but the information is disseminated and not very much organised. This paper shows a review of the latest publications on the use of phase change materials (PCM) in buildings. The paper compiles information about the requirements of the use of this technology, classification of materials, materials available and problems and possible solutions on the application of such materials in buildings.
1,389 citations
TL;DR: In this paper, the state of the art of phase change materials (PCMs) for storing solar energy is discussed. But, prior to the large-scale practical application of this technology, it is necessary to resolve numerous problems at the research and development stage.
Abstract: The continuous increase in the level of greenhouse gas emissions and the climb in fuel prices are the main driving forces behind efforts to more effectively utilise various sources of renewable energy. In many parts of the world, direct solar radiation is considered to be one of the most prospective sources of energy. However, the large-scale utilisation of this form of energy is possible only if the effective technology for its storage can be developed with acceptable capital and running costs. One of prospective techniques of storing solar energy is the application of phase change materials (PCMs). Unfortunately, prior to the large-scale practical application of this technology, it is necessary to resolve numerous problems at the research and development stage. This paper looks at the current state of research in this particular field, with the main focus being on the assessment of the thermal properties of various PCMs, methods of heat transfer enhancement and design configurations of heat storage facilities to be used as a part of solar passive and active space heating systems, greenhouses and solar cooking.
1,173 citations
TL;DR: In this article, a comprehensive review of the integration of phase change materials in building walls is presented. But, even if the integrated phase change material have a good potential for reducing energy demand, further investigations are needed to really assess their use.
Abstract: The present paper is the first comprehensive review of the integration of phase change materials in building walls. Many considerations are discussed in this paper including physical considerations about building envelope and phase change material, phase change material integration and thermophysical property measurements and various experimental and numerical studies concerning the integration. Even if the integrated phase change material have a good potential for reducing energy demand, further investigations are needed to really assess their use.
856 citations
TL;DR: In this article, a review of thermal energy storage (TES) for cold storage applications using solid liquid phase change materials has been carried out, focusing on different aspects: phase change material (PCM), encapsulation, heat transfer enhancement, and the effect of storage on food quality.
851 citations
TL;DR: In this paper, the authors explore how and where phase change materials (PCMs) are used in passive latent heat thermal energy storage (LHTES) systems, and present an overview of how these construction solutions are related to building's energy performance.
817 citations