Experimental performance of a novel scraped surface heat exchanger for latent energy storage for domestic hot water generation

Egea, A.; Molina‐García, Ángel; Herrero-Martín, R.; Pérez-García, J.

doi:10.1016/j.renene.2022.05.057

Cited by 17 publications

(5 citation statements)

References 25 publications

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“…The heat transfer rate decreased at a heat release ratio of more than 80-90% due to the PCM around the HTF tube solidifying. A similar study with a unique LHTES system was conducted by Egea et al [51]. The authors experimentally analyzed the heat release rate of RT-44HC PCM in a vertical cylindrical LHTES system with the HTF surrounding the PCM container.…”

Section: Scraped Surfacementioning

confidence: 86%

“…An HTF is passed through a cavity within the rotating drum to extract thermal energy, which solidifies the PCM on the outer surface of the drum. The PCM is scraped off the outer surface of the drum before A similar study with a unique LHTES system was conducted by Egea et al [51]. The authors experimentally analyzed the heat release rate of RT-44HC PCM in a vertical cylindrical LHTES system with the HTF surrounding the PCM container.…”

Section: Scraped Surfacementioning

confidence: 99%

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A Review on Active Heat Transfer Enhancement Techniques within Latent Heat Thermal Energy Storage Systems

Shank

Tiari

2023

Energies

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Renewable energy resources require energy storage techniques to curb problems with intermittency. One potential solution is the use of phase change materials (PCMs) in latent heat thermal energy storage (LHTES) systems. Despite the high energy storage density of PCMs, their thermal response rate is restricted by low thermal conductivity. The topic of heat transfer enhancement techniques for increasing thermal performance of LHTES systems has mainly focused on passive heat transfer enhancement techniques with less attention towards active methods. Active heat transfer enhancement techniques require external power supplied to the system. In this paper, recent advances in active heat transfer enhancement techniques within LHTES systems are reviewed, including mechanical aids, vibration, jet impingement, injection, and external fields. The pertinent findings related to the field are summarized in relation to the charging and discharging processes of PCMs. Suggestions for future research are proposed, and the importance of additional energy input for storage is discussed.

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Section: Scraped Surfacementioning

confidence: 86%

Section: Scraped Surfacementioning

confidence: 99%

A Review on Active Heat Transfer Enhancement Techniques within Latent Heat Thermal Energy Storage Systems

Shank

Tiari

2023

Energies

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“…Shedding of PCM-solid-layers to enhance heat transfer for the discharge process was mostly achieved using active mechanical scrappers. 39,40 Studies to date do not exist on employing non-stick STFs for the temperature range up to $250 C. In mechanical scrapping, detaching the PCM-solid-layers from HX surfaces is typically accomplished using an electrical motor that provides shaft power for the scrapper. The total energy expended in shedding PCM-solid-layers includes the energy to overcome friction, and mechanical energy to drive the scrapper.…”

Section: Requirement Of Stf Surfaces For Lhtes Applications and Key C...mentioning

confidence: 99%

“…Table 1 summarises the research studies where different methods were utilised to detach the PCM‐solid‐layer from HX surfaces during heat discharge. Shedding of PCM‐solid‐layers to enhance heat transfer for the discharge process was mostly achieved using active mechanical scrappers 39,40 . Studies to date do not exist on employing non‐stick STFs for the temperature range up to ~250°C.…”

Section: Requirement Of Stf Surfaces For Lhtes Applications and Key C...mentioning

confidence: 99%

Super‐liquid‐repellent thin film materials for low temperature latent heat thermal energy storage: A comprehensive review of materials for dip‐coating

Muhumuza,

Eames

2024

Energy Storage

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When discharging latent heat thermal energy storage (LHTES) systems, performance is influenced by the formation and adherence of a solid layer of phase change material (PCM) on heat eXchange (HX) surfaces. Super‐liquid‐repellent thin films (STFs) may be able to reduce solidifying PCM adhesion on HX surfaces during discharging, delay PCM solidification to lower temperatures, and by modifying nucleation sites potentially enable long‐term seasonal thermal storage. Techniques employed previously to fabricate sintered polymeric STF coatings include chemical vapour deposition, dip‐coating, spray‐coating, spin‐coating, layer‐by‐layer (LbL) assembly, sol‐gel, anodizing, electrodeposition, electrospinning, so on. Dip‐coating is considered attractive for fabricating thin films on simple and complex surface geometries due to process maturity, scalability, flexibility and cost‐effectiveness. To identify suitable materials for preparing STFs on metal HX surfaces using the dip‐coating process, more than 200 journal articles published in English during the period 2010 to 2022 were reviewed and the potential role of STFs in LHTES applications was assessed. The review identified key areas and applications stimulating STF material developments and formulations. The dip‐coating of potential STF materials was classified under three major themes driving current research and development (R&D) activities, that is, high performance thin films, eco‐friendly thin films and fundamental research formulations. This review provides a platform from which to develop coatings and HX systems to enable the cost‐effective implementation of STFs for improved heat transfer in future mobile/stationery LHTES systems.

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“…In discharging the material around the HTF tube solidifies first and as the discharging continues the thickness of the solid PCM increases and the effect is equivalent to increasing the thermal resistance applied to the extraction of the remaining energy. Egea et al [195] designed a novel concentric tube heat exchanger with scraper blades to remove the solidified PCM layer from the HTF wall to enhance the discharging process. Four sets of scraper blades were employed for the present study as shown in Fig.…”

Section: Lhtes Units For Dhwmentioning

confidence: 99%

Phase change materials in building integrated space heating and domestic hot water applications: A review

Nair¹,

Wilson²,

Huang³

et al. 2022

Journal of Energy Storage

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Experimental performance of a novel scraped surface heat exchanger for latent energy storage for domestic hot water generation

Cited by 17 publications

References 25 publications

A Review on Active Heat Transfer Enhancement Techniques within Latent Heat Thermal Energy Storage Systems

A Review on Active Heat Transfer Enhancement Techniques within Latent Heat Thermal Energy Storage Systems

Super‐liquid‐repellent thin film materials for low temperature latent heat thermal energy storage: A comprehensive review of materials for dip‐coating

Phase change materials in building integrated space heating and domestic hot water applications: A review

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