Development of a new type of PCM thermal capsule transport system

Microencapsulated phase change slurry (MPCS) is a multiphase fluid with considerable potential to be a next-generation thermal energy transport material because of its high latent heat capacity and heat transfer rate. However, this encapsulated phase change slurry is difficult to transport because of its high viscosity, and its usage with conventional heat exchangers is complex. Therefore, in this study, a new type of thermal energy transport system using a rotary screw fin heat exchanger is developed for the safe and effective transportation of capsules. The long-distance direct PCM transport and MPCMS transport were firstly validated with the new system. The developed system played a role of pumping and heat exchanger has a pipe that rotates and transports MPCS using screw fins and enables the easy flow of water, resulting in enhancement of convective heat transfer. The results indicate that MPCS (<35% mass concentration) can be transported effectively, and the thermal energy transport per unit flow rate can be increased by a maximum of 180% under a supply–demand temperature difference of 25 °C. Finally, thermal cycle testing is conducted to verify the thermal durability of the capsules and fins, and the results confirm the reliability of the designed device.