Abstract
The latent heat thermal energy storage units are very popular because of their high energy density and almost close to constant temperature during the charging/discharging. In the present study has been proposed new shell-and-coil geometry with a shifted coil position to enhance the performance of phase change thermal magazine. The experimental investigations have been performed both for the melting and solidification process of coconut oil for constant wall temperature conditions. The experiments have been carried out for cylindrical as well as coil shape geometry of the TES unit. In the case of annular TES, the copper tube with outer diameter d = 10 mm and total length equal to 165 mm were used (4). In the case of shell-and-coil TES the coil has been also made of a copper tube but with an outer diameter d = 6 mm. The total length of the tube was 460 mm. However, the length of the tube element that has been used in the process of bending the coil had a total length equal to 360 mm. The rest of the tube was straight. The coil pitch was 15 mm and the outer coil diameter was 26 mm. The experiments have been conducted for the coil position at the top and the bottom of the tank. The results showed the influence of heat transfer geometry for phase change efficiency. The article presents the thermal characteristic of melting and solidification phenomena as well as their visual analysis. A significant impact of heat transfer geometry at the shape of the melting and solidification profile. The optimal performance has been achieved for shell-and-coil TES with a coil arranged at the top of the tank.
Highlights
It is well known that increasing pollution influences global temperature growth and the deterioration of living conditions
This study has shown a significant decrease in the charging/discharging time in the case of truncated cone thermal energy storage unit (TES) geometry compare to cylindrical TES [3]
The results showed that copper nanoparticle additives can enhancement the melting process between 5.5% and 6.5% compare to pure phase change material (PCM)
Summary
It is well known that increasing pollution influences global temperature growth and the deterioration of living conditions. One of the possible solutions to stop these adverse changes is the pursuit of energy-saving. The energy could be utilized better if the energy system cooperates with the energy magazine [1]. The TES system can shift the demand for cooling/heating in time and due to that fact enhance energy efficiency [2]. The latent heat thermal energy storage is very popular because of their high energy density and close to a constant temperature of charging/discharging. The PCM’s conductivity is relatively low, which is deterioration the heat transfer efficiency. One of the possibilities to deal with that problem is to optimize the heat transfer area
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have