High performance storage composite for the enhancement of solar domestic hot water systems

Haillot, Didier; Goetz, V.; Py, Xavier; Benabdelkarim, Mohamed

doi:10.1016/j.solener.2011.02.016

Cited by 53 publications

(18 citation statements)

References 17 publications

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“…From the relation given by Rabl 3 , we determine the average number of reflections, m, passing through a CPC inside its acceptance angle, given by equation [2] [2]…”

Section: Figure 1 the Compound Parabolic Concentrator (Cpc)mentioning

confidence: 99%

“…This analysis is based on energy conservation (first law of thermodynamics) to evaluate available energy and performance of the heat storing solar cooker. The efficiency, or performance, depends upon many factors such as design of solar concentrator (optical efficiency, thermal efficiency), storage material, and the system used to store the energy 2 .…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Performance of Thermal Energy Storage in a Solar Cooker

Chourasia

2016

IJSLE

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Finite element analysis was used to simulate the performance of thermal energy storage in a solar cooker which was fabricated by our team. This cooker stores solar energy in materials like sand for future use. It is inexpensive to construct and can be widely used in villages and urban areas. The cooker energy storage unit consists of a cubical solid block which contains sand as a solar-energy storage unit, along with conducting aluminum sheets for uniform heat distribution throughout the block. The block is enclosed in a uniform layer of insulation, except the cavities on the top surface to allow heating of the sand and as well as near the cooking pot. This heated sand can be used at night to heat a cooking pot which is centrally located in the storage box. A paraboloidal concentrator focuses solar radiation through a secondary reflector onto the central zone of the storage block through the cavity in the insulation. The storage is charged for a set period of time and heat is subsequently discharged to a pot during the night time. The effects on cooker performance are compared for various numbers of plates in the storage block. The temperature attained at various stages is studied for various models. This can be used to cook food in a slow manner and can be kept heated until night.Keywords: Solar cooker; simulation; thermal storage; night solar cooker; ANSYS; transient thermal analysis; slow cooker. IntroductionVarious types of solar cookers, with or without thermal energy storage, have been developed over the years 1 . The main advantage of using a thermal energy storage unit for a solar cooker is that cooking can be carried out during periods when there is very little or no solar radiation. A solar cooker with thermal energy storage can also be used during peak hours to limit the demand of electrical energy for cooking.The method of characterizing performance of a solar cooker is based on energy analysis done mathematically and computationally. This analysis is based on energy conservation (first law of thermodynamics) to evaluate available energy and performance of the heat storing solar cooker. The efficiency, or performance, depends upon many factors such as design of solar concentrator (optical efficiency, thermal efficiency), storage material, and the system used to store the energy 2 .

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“…From the relation given by Rabl 3 , we determine the average number of reflections, m, passing through a CPC inside its acceptance angle, given by equation [2] [2]…”

Section: Figure 1 the Compound Parabolic Concentrator (Cpc)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of Performance of Thermal Energy Storage in a Solar Cooker

Chourasia

2016

IJSLE

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“…Composite materials incorporating carbon have enhanced thermal conductivity and have been proposed for solar thermal applications (e.g. [Zhong et al, 2010 andHaillot et al, 2011]). However in some materials, increased thermal conductivity comes at the expense of energy density, which can be reduced by 35% or more due to the volume of the conductive material [Haillot et al, 2011].…”

Section: Overview Of Materialsmentioning

confidence: 99%

“…[Zhong et al, 2010 andHaillot et al, 2011]). However in some materials, increased thermal conductivity comes at the expense of energy density, which can be reduced by 35% or more due to the volume of the conductive material [Haillot et al, 2011]. Like water, PCMs have limited potential for seasonal storage but are explored here for extended periods.…”

Section: Overview Of Materialsmentioning

confidence: 99%

Development of Space Heating and Domestic Hot Water Systems with Compact Thermal Energy Storage

Davidson¹,

Quinnell²,

Burch³

et al. 2013

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“…Bir başka iyileştirme yöntemi ise parafin ile ısıl iletkenliği yüksek malzemelerin birleştirilmesi ile elde edilen kompozit malzemelerin parafin yerine kullanılmasıdır [8][9][10][11][12][13][14][15]. Parafin-grafit kompozit yapılar ısı iletkenliği iyileştirilmiş kompozit FDM'lere örnek olarak gösterilebilir.…”

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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High performance storage composite for the enhancement of solar domestic hot water systems

Cited by 53 publications

References 17 publications

Simulation of Performance of Thermal Energy Storage in a Solar Cooker

Simulation of Performance of Thermal Energy Storage in a Solar Cooker

Development of Space Heating and Domestic Hot Water Systems with Compact Thermal Energy Storage

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

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