Performance investigation of the organosilicone conduction oil with CuO nanoparticles filled in twist tube flow for solar energy storage

摘要

A regular polygon twisted tube with CuO nanoparticles distribution in the organosilicone conduction oil is adopted to improve the thermal performance of parabolic trough collectors (PTCs). A comprehensive numerical study is applied to invistigate the thermal performance of 21 kinds of wisted tubes under the Reynolds number ranging from 50 to 102000 when the temperature is 450 K. The novel twisted tubes are considered with the number of twisted tube edges varying from 1 to 8 and twist angle per unit length varying from 0 degrees to 360 degrees. Results show that the thermal performance of PTC can be enhanced obviously by the nanoparticles. The thermal efficiency enhancement increases with the increasing twist angle, and reaches up to about 306% compare with that for the smooth circular tube. A great effectiveness and uniform performance near the wall region is obtained with the designed complex method. The case of twist angle theta =360 degrees has a better thermal performance when it is compared with the ones with other twist angle. The case of twist angle theta=270 degrees with Reynolds number ranging from 3300 to 12200 has a better comprehensive energy-saving performance when it is compared to the cases with other twist angles. At the same heat transfer capacity, the energy consumption is reduced by 50%.