Heat release characteristics of a latent heat storage heat exchanger by scraping the solidified phase change material layer

Maruoka, Nobuhiro; Tsutsumi, Taichi; Ito, Akihisa; Hayasaka, Miho; Nogami, Hiroshi

doi:10.1016/j.energy.2020.118055

Cited by 33 publications

(10 citation statements)

References 84 publications

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“…After solidification, the solid PCM has a large thermal resistance, which further hinders the heat transfer of the PCM. Maruoka et al 81 conducted a dynamic study on similar double‐pipe heat exchangers, as shown in Figure 26, the inner tube rotates, and the scraper is set on the inner and outer sides of the inner tube. The inner side of the inner tube is HTF.…”

Section: Latent Heat Thermal Storage Heat Exchanger Used In Stcmentioning

confidence: 99%

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Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Liu

Zhang

2021

Int J Energy Res

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This article reviews the design of solar phase-change energy storage systems and their applications in residential buildings. The solar thermal collection system has high heat collection efficiency, no pollution, and it is also widely used in the field of building heating. In order to improve the efficiency of the solar collector system, the researchers found that integrating phase-change materials (PCMs) into the solar thermal collector system can achieve this goal, but there will be a problem of PCM leakage. Some researchers have solved this problem by microencapsulating PCMs, the thermal conductivity and energy storage efficiency of the PCMs after microencapsulation will be greatly affected. Adjusting the solar collector to an appropriate inclination angle can achieve the highest heat collection efficiency. Choosing the PCM in the appropriate temperature zone can improve the system efficiency. For the separated solar collector system, the parts that need to be considered include the type of heat exchanger, the structure of the energy storage heat exchanger, the shape of the heat exchanger fins, the type of solar collector, and so on. All in all, coupling PCM into the solar collector system can improve energy efficiency reduce carbon emissions and have good economics, the maximum internal rate of return of solar collectors integrated with PCMs in residential and industrial applications is 22% and 17.2%.

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Section: Latent Heat Thermal Storage Heat Exchanger Used In Stcmentioning

confidence: 99%

“…Cross‐sectional figure of the proposed latent heat storage bath 81 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Latent Heat Thermal Storage Heat Exchanger Used In Stcmentioning

confidence: 99%

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Liu

Zhang

2021

Int J Energy Res

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“…On the other hand, heat exchangers that can be used in non-clean environments are critical in recent applications. For example, the scale of geothermal utilization [8][9][10] and the solidified layer in latent heat storage (LHS) 5,6,[11][12][13][14] cover the heat exchange wall heat exchange wall and impede efficient heat transfer. The heat transfer rate decreases significantly due to the thermal resistance in the covered layer, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 2 shows a schematic representation of the rotating heat exchanger consisting of a tube-type heat exchanger comprising a rotating cylinder as the heat exchange wall and a fixed blade attached to the rotating cylinder. 11) Figure 3 shows a cross-sectional image of the heat exchanger. 11) When the solid phase precipitated on the outer surface of the rotating cylinder, the precipitates were scraped immediately by the fixed blade in contact with the rotating cylinder, and the heat transfer surface was refreshed continuously.…”

Section: Introductionmentioning

confidence: 99%

“…11) When the solid phase precipitated on the outer surface of the rotating cylinder, the precipitates were scraped immediately by the fixed blade in contact with the rotating cylinder, and the heat transfer surface was refreshed continuously. 11) This heat exchanger was originally proposed by Chiba et al, and high heat transfer characteristics achieved by removing the thermal boundary layer on the both heat exchange wall surfaces have been reported. 15) We extended the heat exchanger for the application of LHS system by combining a rotating cylinder and a fixed blade.…”

Section: Introductionmentioning

confidence: 99%

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Long-term Experiment of Hot Spring Heat Recovery Using Rotary Heat Exchanger by Controlling Precipitation

Maruoka

Yamamoto

Endo³

et al. 2022

ISIJ Int.

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To establish a low-carbon society, it is necessary to break away from dependence on fossil fuels, and the utilization of geothermal energy/waste heat is one of the key methods. When using geothermal energy, the rate of heat transfer decreases with time due to the precipitation of scale on the heat transfer surface, and periodic maintenance is required. Therefore, the running cost of utilizing geothermal energy is high. We focused on a rotary heat exchanger consisting of a rotating cylinder as the heat transfer wall and a fixed blade attached to the rotating cylinder for scraping the heat transfer surface. In this study, the heat recovery characteristic from chloride hot spring was experimentally evaluated. The results showed that scale formation on the heat transfer surface could be suppressed and the heat transfer characteristics could be maintained for one month.

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A Review on Thermal Properties Improvement of Phase Change Materials and Its Combination with Solar Thermal Energy Storage

Liu

Zhang

et al. 2021

Energy Tech

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This article summarizes measures to enhance the solar phase change thermal energy storage (TES), starting from two key points in solar phase change TES research: solar phase change materials (PCM) and solar phase transition devices. First, different types of PCM and their advantages and disadvantages are introduced. To improve thermal performance, the research progress of different dimensional thermal conductivity additives, photothermal composite phase change materials (CPCM), and phase change microcapsules is reviewed. Then, the characteristics of commonly used solar phase transition TES devices and the research status of solar energy device improvement with fins and multistage phase transition TES are summarized for the past few years. It is hoped to provide methods and ideas for the design and research of solar phase change TES systems, and to increase the overall heat transfer properties through the combination of multiple optimization methods. Finally, the future direction and research focus of solar phase change TES technology are put forward.

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Heat release characteristics of a latent heat storage heat exchanger by scraping the solidified phase change material layer

Cited by 33 publications

References 84 publications

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Long-term Experiment of Hot Spring Heat Recovery Using Rotary Heat Exchanger by Controlling Precipitation

A Review on Thermal Properties Improvement of Phase Change Materials and Its Combination with Solar Thermal Energy Storage

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