Study on effect of effective thermal conductivities on melting characteristics of latent heat storage capsules

Shiina, Yasuaki; Inagaki, Terumi*

Nihon Kikai Gakkai Rombunshu, B, 69(681), p.1233 - 1241, 2003/05

https://doi.org/10.1299/kikaib.69.1233

In order to reduce phase change time in latent heat technology, improvement of effective thermal conductivity of heat storage unit would be one of the techniques. Effect of effective thermal conductivity on melting time are studied analytically of circular composite heat storage capsules made by immersing phase change materials (PCM) into porous metals. Numerical and approximate analysis were made with the consideration of uniform and non-uniform heat transfer coefficients around the cylindrical surface. Four PCMs (HO,Octadecane, LiCO, NaCl) and three metals (copper, aluminum and carbon steel) were selected specific materials. Porosity of the metals were restricted larger than 0.9 in order to lessen decrease in latent heat. Results show that reduction in melting time was obtained for the above PCMs, especially for low conductivity PCMs. Melting time obtained by approximate analysis agrees well with numerical analysis. High Nusselt number and high thermal conductivity of heat transfer fluid would be more effective to reduce phase change time.

Study on thermal characteristics of composite heat storage units made by impregnation of phase change material into porous materials; For cases of porous ceramics and porous metals (Cooperative research)

Shiina, Yasuaki; Komaki, Katsuya*; Tanaka, Gaku*; Hishida, Makoto*

JAERI-Tech 2001-076, 49 Pages, 2001/11

JAERI-Tech-2001-076.pdf:2.3MB

no abstracts in English

Derivation of Basic Equations for Rigorous Dynamic Simulation of Cryogenic Distillation Column for Hydrogen Isotope Separation

; Naruse, Yuji

JAERI-M 9657, 13 Pages, 1981/08

JAERI-M-9657.pdf:0.32MB

no abstracts in English