Development of a new methodology for validating thermal storage media: Application to phase change materials

Bayón, Rocío; Rojas, Esther

doi:10.1002/er.4589

Cited by 12 publications

(4 citation statements)

References 119 publications

(455 reference statements)

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“…Mass decrease can be due to vaporization and, hence, to material loss but also to the formation of volatile species due to the occurrence of chemical reactions so that the PCM composition changes. If mass loss is due to chemical reactions leading to volatile species, not only PCM thermal properties are expected to change but dangerous compounds can be evolved [8]. Note that if PCM is reacting with the surrounding gases (mainly water vapor or oxygen), its mass could increase as well.…”

Section: Sample Mass Monitoring After Certain Number Of Cycles or Timmentioning

confidence: 99%

“…In the case of solid-liquid PCM, heat is stored and released under repeated melting and solidification processes, which are also referred as thermal cycles. To assess the suitability of a PCM for a thermal storage application, testing the variation of its thermal properties under repeated thermal cycling (type A tests) taking application conditions into account is crucial [6][7][8]. Relevant experimental conditions are the temperature interval, heating and cooling rates, contact to atmosphere, contact to container, heat exchanger material, etc.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Devices to Investigate the Long-Term Stability of Phase Change Materials under Application Conditions

et al. 2020

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An important prerequisite to select a reliable phase change material (PCM) for thermal energy storage applications is to test it under application conditions. In the case of solid–liquid PCM, a large amount of thermal energy can be stored and released in a small temperature range around the solid–liquid phase transition. Therefore, to test the long-term stability of solid–liquid PCM, they are subjected to melting and solidification processes taking into account the conditions of the intended application. In this work, 18 experimental devices to investigate the long-term stability of PCM are presented. The experiments can be divided into thermal cycling stability tests, tests on PCM with stable supercooling, and tests on the stability of phase change slurries (PCS). In addition to these experiments, appropriate methods to investigate a possible degradation of the PCM are introduced. Considering the diversity of the investigated devices and the wide range of experimental parameters, further work toward a standardization of PCM stability testing is recommended.

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Section: Sample Mass Monitoring After Certain Number Of Cycles or Timmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Devices to Investigate the Long-Term Stability of Phase Change Materials under Application Conditions

et al. 2020

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“…The energy storage density, duration of hot water produced and energy efficiency are enhanced at a significant amount by using PCM in storage tank. Bayon et al [6] assessed the various types of PCM and explained the characterization, life cycle testing and thresholds of thermophysical and chemical properties based on applications. Govindasamy et al [7] and Godwin et al [8] theoretically analyzed the various organic and inorganic PCM properties, in different environment conditions and in various storage medium.…”

Section: Literature Reviewmentioning

confidence: 99%

Calorimetric investigation of magnesium nitrate hexahydrate and sodium thiosulphate pentahydrate as salt mixture encapsulated materials for thermal energy storage

Rajamani¹,

Balasubramaniam²,

Radhakrishnan³

2020

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI190602456RThe use of magnesium nitrate hexahydrate and sodium thiosulphate pentahydrate salt composite as an encapsulated phase change material in solar water heater storage unit for thermal energy storage was experimentally tested and investigated in this research study. A differential scanning calorimetry is performed to determine the properties such as melting temperature, specific heat capacity, and latent heat of the selected mixtures for the proportion 70:30 and 80:20 by weight. For the experimentation, these two samples are stored separately in the aluminum canisters and filled in storage tank to avoid the heat loss directly. The thermal performance of the solar water heater at different zones on collector with and without using encapsulated phase change material in storage tank was tested experimentally. Maximum temperature achieved in solar water collector was 50 °C at midpoint and 46 °C at outlet of the tank. It is found that even after late evenings 18.00 IST, the average storage tank temperature with phase change material was found to be nearly 2.6 to 3.2 times greater than conventional solar water heater and the average temperature of phase change material is 42 °C. The test results shows that sample B 80:20 will produces higher amount of hot water and stores the maximum heat compared to sample A 70:30. The results demonstrate that this encapsulated phase change material cylinder stores higher latent heat of fusion and, it can also be used for indirect solar cooking and other low temperature application even at late evenings.

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“…The majority of the studies in literature, focus on thermal cycling tests in order to evaluate the use of PCMs as latent heat storage media. It was found out that most of these tests concerned PCMs used for low‐temperature applications (below 100°C) whilst very few studies were found for applications above 100°C 16 …”

Section: Introductionmentioning

confidence: 99%

Alternative storage options for solar thermal systems

2020

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The efficient implementation of solar systems in buildings depends on the storage of energy yielded, as it can both increase the solar system's autonomy and make it a feasible solution for zero energy buildings, and make storage vessels more compact, reducing precious space requirements. This is of particular important in places with reduced time of sunshine, where solar systems are less effective, because of the deviation between solar radiation and the demand. The traditional storage options use water, which is practical, safe and low-cost, especially when the storage requirements are small. However, when larger storage is needed, limits concerning the use of water exist, mainly due to the need for larger installation space and the increased thermal losses. The use of phase change materials (PCM) for thermal energy storage seems an upcoming technology. The main idea is the substitution of water with PCM, which feature larger specific energy storage capacity compared to other conventional materials. In the context of the specific paper, a combined solar thermal system used for the preparation of domestic hot water (DHW) and space heating (Solar Combi System) with two different types of storage is studied, for two Greek cities. The aim is to find out which is the most efficient way of storing energy with respect to the autonomy of the system, for a solar combi system. This is being achieved by determining the comparative autonomy of PCM and water storage system for various climates. It was proven that using PCM is advantageous, as it can extend the autonomy duration of the solar system for 2 to 8 hours, depending on the season and the climatic conditions. However, it was also seen that in solar combi systems used throughout the whole year, PCM are inefficient during summer period.

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Development of a new methodology for validating thermal storage media: Application to phase change materials

Cited by 12 publications

References 119 publications

Experimental Devices to Investigate the Long-Term Stability of Phase Change Materials under Application Conditions

Experimental Devices to Investigate the Long-Term Stability of Phase Change Materials under Application Conditions

Calorimetric investigation of magnesium nitrate hexahydrate and sodium thiosulphate pentahydrate as salt mixture encapsulated materials for thermal energy storage

Alternative storage options for solar thermal systems

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