Thermally conductive high‐density polyethylene as novel phase‐change material: Application‐relevant long‐term stability

Weingrill, Helena; Resch‐Fauster, Katharina; Lucyshyn, Thomas; Zauner, Christoph

doi:10.1002/app.48269

Cited by 9 publications

(11 citation statements)

References 37 publications

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“…The material lost only minimal storage capacity over time, although it should be noted that the material with filler had lower thermal capacity than the pure HDPE. The expanded graphite was shown to best for enhancing the thermal conductivity at the studied composition, while the aluminum was best for improving the stability against thermo-oxidation …”

Section: Emerging Materials Types For Intermediate Temperature Range ...mentioning

confidence: 97%

“…Polymers, like most organic materials, suffer from low thermal conductivity. Approaches to improve this include the addition of carbon, metals, metal oxides, nitrides, and other additives. , The low thermal stability and high flammability of polymers, especially above the melting point, and aging effects over prolonged periods of heating, are also important drawbacks . If these disadvantages could be overcome, HDPE would certainly be among the most promising as a low-cost energy storage PCM for the 130 °C range.…”

Section: Emerging Materials Types For Intermediate Temperature Range ...mentioning

confidence: 99%

“…Unfortunately, these are often not part of primary research reports in the field. Ideally, methods such as FT-IR and NMR should be performed before and after extensive cycling of PCMs, ,, or after exposing the material to different atmospheres, such as oxygen, for a prolonged time, e.g., >7000 h. , Aside from examining the materials after cycling, such spectroscopic methods can also be used to determine the purity of the PCM prior to cycling, because even small traces of impurities can become detrimental upon long-term cycling.…”

Section: Practical Challenges and Important Materials Propertiesmentioning

confidence: 99%

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Phase Change Materials for Renewable Energy Storage at Intermediate Temperatures

et al. 2022

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Thermal energy storage technologies utilizing phase change materials (PCMs) that melt in the intermediate temperature range, between 100 and 220 °C, have the potential to mitigate the intermittency issues of wind and solar energy. This technology can take thermal or electrical energy from renewable sources and store it in the form of heat. This is of particular utility when the end use of the energy is also as heat. For this purpose, the material should have a phase change between 100 and 220 °C with a high latent heat of fusion. Although a range of PCMs are known for this temperature range, many of these materials are not practically viable for stability and safety reasons, a perspective not often clear in the primary literature. This review examines the recent development of thermal energy storage materials for application with renewables, the different material classes, their physicochemical properties, and the chemical structural origins of their advantageous thermal properties. Perspectives on further research directions needed to reach the goal of large scale, highly efficient, inexpensive, and reliable intermediate temperature thermal energy storage technologies are also presented. CONTENTS References R

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Section: Emerging Materials Types For Intermediate Temperature Range ...mentioning

confidence: 97%

Section: Emerging Materials Types For Intermediate Temperature Range ...mentioning

confidence: 99%

Section: Practical Challenges and Important Materials Propertiesmentioning

confidence: 99%

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Phase Change Materials for Renewable Energy Storage at Intermediate Temperatures

et al. 2022

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“…Unfortunately, its thermal conductivity is low, which is compensated through improved materials or storage design [18]. Reference [13] built a demonstrator using HDPE as a storage material and aluminum alloy fins on the heat exchanger to overcome limitations through thermal conductivity.…”

Section: A State Of the Art Technologymentioning

confidence: 99%

Design and Performance Analysis of a Latent Heat Storage for the Operation of a High-Temperature Methanol Fuel Cell

Deinert¹,

Daschner²,

Hornung³

2021

Atlantis Highlights in Engineering

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Due to ever stricter economical and legislative regulations, the efficiency of technical processes has to be constantly increased. Besides many other efficiency enhancing methods, the use of waste heat has a great potential to save energy. In particular, the use of waste heat at temperatures above 373 K offers many possibilities, as it is mostly unused today. In order to exploit these potentials, a new latent heat storage system using a polymer as a phase change material has been developed during the R&D project "eleMeMe -Decentralized decoupling of power generation and energy supply through onsite electrochemical methanol production and methanol fuel cells". The storage is used to operate a hightemperature methanol fuel cell. Usually the fuel cell must be electrically preheated before the start to reach its optimum operating temperature. During operation, heat is generated and the system has to be air cooled to maintain its temperature. Instead of cooling the system with air, the heat is now stored in a latent heat storage system to start the fuel cell later.

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“…Therefore, some studies focus on the enhancement of that property, for example, by adding metallic composites. [ 22–28 ]…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Thermal Management of a High‐Temperature Methanol Fuel Cell Using a Latent Heat Storage

et al. 2021

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Waste heat from industrial applications offers a high but mostly unused potential due to the time differences between its generation and possible consumption. By using waste heat, the energy efficiency can be increased and therefore, the overall costs and emissions can be reduced. This work shows the feasibility of increasing the energy efficiency of a high‐temperature methanol fuel cell using a latent heat storage with the help of full‐scale experiments. The fuel cell needs to be preheated for start up to reach its operation temperature. During operation, heat is generated at a temperature of 433 K and the system needs to be air‐cooled to maintain its temperature. Instead of cooling the fuel cell with air and losing the heat to the environment, the waste heat is now stored in a latent heat storage to later be used for preheating the fuel cell. Different experiments are conducted to find the optimum operation point of the latent heat storage in combination with the fuel cell. The aging and the cycling stability of high density polyethylene, which is used as phase change material in the latent heat storage, is monitored as well as the mechanical stability of the system.

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Thermally conductive high‐density polyethylene as novel phase‐change material: Application‐relevant long‐term stability

Cited by 9 publications

References 37 publications

Phase Change Materials for Renewable Energy Storage at Intermediate Temperatures

Phase Change Materials for Renewable Energy Storage at Intermediate Temperatures

Design and Performance Analysis of a Latent Heat Storage for the Operation of a High-Temperature Methanol Fuel Cell

Analysis of the Thermal Management of a High‐Temperature Methanol Fuel Cell Using a Latent Heat Storage

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