Charging of phase change material layers through air heat exchanger considering TiO2 nanomaterial

Abstract
Air heat exchanger for reaching cold air has been suggested in current article including sinusoidal containers\r\nfilled with PCM. The type of paraffin (RT25) was selected according to summer temperature and TiO2 nano-sized\r\nmaterials have been dispersed in to paraffin. Hot air with Tin=35 ◦C and Re=6000 enters the duct and goes\r\nthrough the air passages among the containers. At start of process, temperature of domain is 20 ◦C and PCM\r\nbecome warmer and its temperature reaches to 25 ◦C then it starts to convert to liquid. The regimes of flow inside\r\nthe paraffin and air zones are laminar and turbulent. Finite volume method with K-ε approach and implicit\r\ntechnique for transient terms has been incorporated considering structure form of grid. With dispersing the TiO2\r\nnanoparticles, the required time for melting reduces about 4.59% and 4.67% when b = 7.5 and 12.5 mm. This\r\npromising effect of nanomaterial on charging rate is mainly relevant to augmentation of conductivity. If the\r\ndistance between the PCM tanks (b) augments, hot air can move easier along the passages and charging rate\r\nenhances about 45.26%. When b = 12.5 andϕ = 0.04, the minimum needed time for melting occurs and charging

Author
ziyad jamil talabany

DOI
doi.org/10.1016/j.est.2021.103652

ISSN

Publish Date: 2021-10-21