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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

INVESTIGATION OF THE HEAT TRANSFER CHARACTERISTICS OF THE PARALLEL PLATE VOLUMETRIC ABSORPTION SOLAR COLLECTOR USING MICRO-ENCAPSULATED PHASE CHANGE SLURRY

Get access (open in a dialog) DOI: 10.1615/IHTC16.nee.022207
pages 7417-7425

Résumé

Volumetric absorption solar collector has attracted much attention in recent years compared with conventional surface-based solar collector due to its higher energy conversion efficiency. The nanofluid is usually used as the heat transfer fluid to directly absorb the solar radiation energy. However, the volume fraction of nanoparticle is extremely small, which is in general far lower than 1 vol%, because of the high extinction coefficient of particle in nano-scale. The micro-encapsulated phase change material (MPCM) slurry is currently popular in the fields of energy transport and storage due to large heat capacity. Therefore, a concept that adopting MPCM slurry as the heat transfer fluid and energy storage medium rather than nanofluid in the volumetric absorption solar collector is proposed in the present study. The optical property of micro-scale particle is not as good as that of nano-scale particle so that the extinction coefficient of the slurry can be enhanced through increasing the volume fraction of particle, which can make full use of the large heat capacity of the MPCM. The extinction coefficient of the MPCM slurry with relatively large particle size and high volume fraction compared with nanofluid is firstly estimated to validate the feasibility of the MPCM slurry as the heat transfer fluid in the volumetric absorption solar collector. Then the Eulerian mixture model is built to investigate the thermal performance of the volumetric absorption solar collector based on the MPCM slurry. The thermal performance of the VASC using the slurry without phase change is also studied for comparison.