Maximization of performance of a PCM latent heat storage system with innovative fins

Sciacovelli, Adriano; Gagliardi, Flavio; Verda, Vittorio

doi:10.1016/j.apenergy.2014.07.015

Cited by 456 publications

(124 citation statements)

References 26 publications

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“…These convective flows, however, were not found even in the NEPCM with plain exchanger tube, as it can be easily seen by observing test 3, where the green line is more distant from the others than in test 1. In this case, the presence of nanoparticles significantly increases the viscosity [9,43,44] of the fluid and probably inhibits the starting of the abovementioned flows [40]. Thus, we can affirm that, when the PCM is in liquid phase and there are no physical limitations (i.e.…”

Section: Advancements In Energy Storage Technologiessupporting

confidence: 55%

“…The transition from a conductive to a convective regime produced a significant increase in thermal exchange with a reduction in charging and discharging times and consequent increase in available thermal power and system efficiency. The conditions necessary to establish these convective motions have been extensively studied both experimentally [30,[34][35][36] and numerically [37][38][39][40][41]. The last goal is to promote this sort of heat exchange within the LHTES to achieve an optimized and efficient system.…”

Section: Advancements In Energy Storage Technologiesmentioning

confidence: 99%

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Heat Exchange Analysis on Latent Heat Thermal Energy Storage Systems Using Molten Salts and Nanoparticles as Phase Change Materials

Miliozzi¹,

Liberatore²,

Nicolini³

et al. 2018

Advancements in Energy Storage Technologies

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The increase of carbon dioxide emissions is the most important contributor to climate change. A better use of produced energy, increasing systems efficiency and using renewable sources, can limit them. A key technological issue is to integrate a thermal energy storage (TES). It consists in stocking thermal energy through the heating/cooling of a storage material for future needs. Among various technologies, latent heat TES (LHTES) provides high energy storage density at constant temperature during melting/solidification of storage media. The bottleneck in the use of typical PCMs is their low thermal conductivity. To improve the heat exchange between heat transfer fluid and PCM, three methods are possible and here experimentally analyzed: conductivity systems enhancements; convective flows promotion in liquid phase; and improvement of PCM thermal properties including small amounts of nanoparticles. CFD models were used to evaluate physical phenomena that are crucial for optimized LHTES systems design. The study of the heat exchange mode allowed some useful indications to achieve an optimized LHTES, taking advantage by convective flows and conductivity promotion systems. The use of NEPCM, to maximize the stored energy density and realize compact systems, makes necessary the improvement of its thermal diffusivity. These will be the future research topics.

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Section: Advancements In Energy Storage Technologiessupporting

confidence: 55%

Section: Advancements In Energy Storage Technologiesmentioning

confidence: 99%

Heat Exchange Analysis on Latent Heat Thermal Energy Storage Systems Using Molten Salts and Nanoparticles as Phase Change Materials

Miliozzi¹,

Liberatore²,

Nicolini³

et al. 2018

Advancements in Energy Storage Technologies

View full text Add to dashboard Cite

show abstract

“…[23][24][25] discuss the development, modelling and application of novel PCM potentially to enhance the thermal storage and efficiency capabilities of residential and commercial buildings. Ref.…”

Section: Thermal Energy Storagementioning

confidence: 99%

Energy storage systems for a low carbon future – in need of an integrated approach

2015

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“…Parafinin düşük ısı iletkenliği, ısı depolamada kullanılan parafinli sistemlerin ısıl şarj/deşarj hızını belirgin olarak sınırlamaktadır. Parafinin ısı iletkenliğini artırmak için parafinin metal köpükler ve kanatçık [6,7] gibi yapılarla beraber kullanılması önerilmiştir.…”

Section: Introductionunclassified

Faz Değiştirme ile Isı Depolamada Kullanılan Parafin-Grafit, Parafin- Kanatçık ve Saf Parafinli Yapıların Performans Analizi

Dönmezer

2017

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzIsıl enerjiyi depolamada Faz Değiştiren Maddelerin (FDM) kullanımı en verimli yöntemlerden biridir. Değişken aralıklı erime/katılaşma sıcaklığına ve ortalama ısı depolama yoğunluğuna sahip ticari parafin ısıl enerji depolamada en çok incelenen FDM'lerin başında gelir. Parafin FDM'ler yüksek ısı depolama kapasitelerine rağmen düşük ısı iletkenliklerinden dolayı sistemlerin ısıl şarj/deşarj hızını belirgin olarak sınırlamaktadır. Parafinin ısıl iletkenliğini iyileştirme amaçlı kanatçık ve parafin-grafit yapılar kullanılmaktadır. Bu çalışmada ısıl iletkenlikleri geliştirilmiş parafin-grafit, parafin-kanatçık ile saf parafinli iki boyutlu yapılar ısıl deşarj anında modellenerek ısıl performansları bakımından birbirleriyle karşılaştırılmıştır. Bu karşılaştırmada yapıların zamana bağlı sıcaklık dağılımları, deşarj ettikleri toplam ısı miktarı ve faz değiştirme hızları belirleyici faktörler olarak kullanılmıştır. Sonuçlar, parafin-kanatçık yapıların ısıl performanslarının, yüksek ısı deşarj hızı ve ısı depolama kapasiteleri birlikte düşünüldüğünde, parafin-grafit ve saf parafin yapılarla karşılaştırıldığında daha gelişmiş olduğunu göstermektedir.Anahtar Kelimeler: Parafin, Grafit, Metal kanatçık, Faz değiştiren madde (FDM) Performance Analysis of Paraffin-Graphite, Paraffin-Fin and Pure Paraffin Structures Used in Phase Change Energy Storage AbstractUsage of Phase Change Materials (PCM) for storage of thermal energy is one of the most efficient methods to store thermal energy. The commercial paraffin, with a wide range of melting and solidification temperatures as well as moderate thermal storage densities, has been one of the most studied PCMs for thermal energy storage. Although the thermal storage capacity of paraffin PCMs are high, their low thermal conductivity limits the thermal charging/discharging rates considerably. The thermal conductivity of paraffin is enhanced by finned and paraffin-graphite structures. In this study, pure paraffin and thermally enhanced paraffin-graphite and paraffin-fin two-dimensional structures during thermal discharge are modeled. After modeling their thermal responses are compared with each other. The transient temperature distribution, total energy discharged and the rate of phase change are used as indicators in this comparison. The results show, considering both the thermal discharge rate and the * Sorumlu yazar (Corresponding author): Nazlı DÖNMEZER,

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Maximization of performance of a PCM latent heat storage system with innovative fins

Cited by 456 publications

References 26 publications

Heat Exchange Analysis on Latent Heat Thermal Energy Storage Systems Using Molten Salts and Nanoparticles as Phase Change Materials

Heat Exchange Analysis on Latent Heat Thermal Energy Storage Systems Using Molten Salts and Nanoparticles as Phase Change Materials

Energy storage systems for a low carbon future – in need of an integrated approach

Faz Değiştirme ile Isı Depolamada Kullanılan Parafin-Grafit, Parafin- Kanatçık ve Saf Parafinli Yapıların Performans Analizi

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