Thermal performance analysis of combined solar collector with triple concentric-tube latent heat storage systems

In this paper, an analysis of the thermal performance of triple concentric-tube latent heat storage systems filled with a commercial phase change material (PCM: RT50) is presented. The triple concentric-tube storage systems incorporating PCM are connected with a flat-plate solar collector. Water act...

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Bibliographic Details
Published in:Energy and buildings 2018-06, Vol.168, p.438-456
Main Authors: Elbahjaoui, Radouane, El Qarnia, Hamid, Naimi, Abdelouahed
Format: Article
Language:English
Subjects:
Buildings
Convection
Energy consumption
Finite volume method
Forced convection
Free convection
Heat conductivity
Heat storage
Heat transfer
Heat transfer fluid (HTF)
Latent heat
Mathematical models
Melting
Phase change material (PCM)
Phase change materials
Solar collectors
Solar energy
Solar energy storage
Solar heating
Storage systems
Thermal conductivity
Thermal energy
Triple concentric-tube storage system
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Summary:In this paper, an analysis of the thermal performance of triple concentric-tube latent heat storage systems filled with a commercial phase change material (PCM: RT50) is presented. The triple concentric-tube storage systems incorporating PCM are connected with a flat-plate solar collector. Water acting as heat transfer fluid (HTF) flows in the solar collector and receives solar thermal energy. The latter is then transferred by forced convection to the PCM and stored as latent heat in the storage unit. The finite volume method is used to model and numerically investigate the melting and heat transfer processes. The effect of natural convection on the melting heat transfer is taken into consideration through an effective thermal conductivity of the liquid phase of PCM. The thermal performance of the triple concentric-tube latent heat storage unit is evaluated and compared with the performance of the double concentric-tube storage unit under the meteorological conditions of a typical day of the month of July in Marrakesh city, Morocco. The results reveal that the combined solar collector with triple concentric-tube storage unit owns higher storage and collection efficiencies than that combined with double concentric-tube unit.
ISSN:0378-7788
1872-6178
DOI:10.1016/j.enbuild.2018.02.055