Heat Transport Evaluation of Nanosuspension as Latent Heat Storage Material

This paper deals with the characteristics of a straight pipe inner flow of the nanosuspension that has non-Newtonian viscosity. The parameters are set in the mass composition of 10–20 mass% of dispersoid and in the temperature range of 20–70 ℃ that includes the melting point of tetracosane. The experimental study is carried out by using the flow pressure loss measurement apparatus. The test section that made of a stainless straight pipe has an inner diameter 8 mm, and it has the length 1000 mm. The inner flow of a straight pipe is occurred by using a pump that is controlled by an inverter. The pressure drop is measured by a differential pressure gauge. The measured pressure loss is used for the calculation of the flow friction loss coefficient and the pump power. The experimental data are evaluated by the variation of the pressure loss coefficient with Reynolds number that defined by the non-Newtonian behavior. Viscosity data by previous study data that correlated by the power law method are used for Reynolds number calculation. The viscosity including non-Newtonian characteristics had been estimated by using a rotary viscosity meter. The measuring ranges are shear rate <500 1/s and temperature 10–84 ℃. The calculation data from experimental correlation equation, which was adjusted by an exponential law, are used for Reynold’s number. The flow friction loss coefficient and the pump power are estimated by measured flow pressure loss. The heat transport amount is calculated by the sensible heat and the latent heat of nanosuspension. The thermal property data (specific heat and latent heat) are the obtained data by previous study that measured by using differential scanning calorimeter. The relationship between the heat transport amount and pump power of this study is shown that the heat transport ability of nanosuspension is 1.5–2 times of water at the same value of pump power.