2019 Volume 33 Issue 4 Pages 151-158
This study shows the results of measurement and evaluation of the thermal conductivity and density of the nanosuspension type latent heat storage material in which the latent heat storage material is dispersed in nano size. The latent heat storage material dispersed in the test nano suspension is tetracosane with a melting point of 50.6 ° C, and is dispersed in distilled water using a nonionic surfactant. The latent heat storage material dispersed by using an ultrasonic homogenizer has an average diameter of 265 nanometers. The data of density and thermal conductivity of nanosuspensions as a flowable latent heat storage materials are provided useful basic data for the design of latent heat storage systems. In this study, a density hygrometer is used to measure the density of the nanosuspension, an experimental device of transient hot wire method is used to measure the thermal conductivity. The measurement range are the mass composition ratio of dispersoid 10.0 to 40.0mass% and the temperature of 10 to 84°C. It is shown that the density of the test nanosuspension can be estimated by the additivity law, and that the Maxwell-Eucken model is effective for the estimation of the thermal conductivity.
