OMORI Hiromi Kyushu Univ.Dept.of Chem.Eng., Technical Official, 工学部, 教務員 (10260712)
NODA Hidehiko Kyushu Univ.Dept.of Chem.Eng., Research Associate, 工学部, 助手 (00112409)
FUKAI Jun Kyushu Univ.Dept.of Chem.Eng., Associate Professor, 工学部, 助教授 (20189905)
|Budget Amount *help
¥1,900,000 (Direct Cost : ¥1,900,000)
Fiscal Year 1996 : ¥500,000 (Direct Cost : ¥500,000)
Fiscal Year 1995 : ¥1,400,000 (Direct Cost : ¥1,400,000)
A latent heat storage column was developed in order to use the solar energy effectively. We adopt form-stable cylindrical polyethylene particles as the phase change material and ethylene glycol as heat transfer fluid. The form-stable polyethylene can retain their shapes when heated above the melting point and thus enables heat transfer by direct contact with heat transfer fluid.
The experimental and numerical analyzes were carried out to investigate the discharge characteristics of the latent heat storage column. Firstly, particle-to-fluid heat transfer coefficient in a latent heat storage column was evaluated experimentally using the extended Schumann's theory, and correlated with the dimensionless groups associated with fluid dynamics, configuration of particles and so on. The resulting heat transfer coefficient was found to be definitely lower than those predicted from previously published work. Secondly, a theoretical model representing fluid dynamics and heat transfer in the latent heat storage column was developed. By using the model, the transient temperature distribution in the column and the transient response of the outlet temperature of heat transfer fluid were numerically calculated and compared with experiments. The numerical results were found to be in good agreement with the experimental results.