Study on heat transfer enhancing performance of spiral groove tube in phase change heat storage for solar energy

Study on heat transfer enhancing performance of spiral groove tube in phase change heat storage for solar energy

Blog Article

Based on the energy storage problems for solar energy utilization and the advantages of spiral groove tube heat exchanger, spiral groove tubes are used in the solar energy phase change heat storage, with numerical simulation of the thermal storage process of heat reservoir.Firstly, the simulation method and the reliability of the used model are verified experimentally with smooth tube.Using spiral groove tube as water flow pipe and phase change material as heat storage medium, building the three-dimensional model by Gambit software earthbath facial wipes and meshing by ICEM, the heat storage process in the spiral groove tube and smooth tube heat storage are numerically simulated while the heat transfer enhancing effect is investigated.The influence of structural parameters such as groove pitch and groove depth on the heat storage process is simulated numerically and the influence rules are analyzed.

The results show that the convective heat transfer intensity and heat transfer capability are enhanced when the smooth tubes are substituted by spiral groove tubes in the phase change heat storage and the heat storage time become shorter.In the range of simulation, the gtech brush bar optimal structural parameters of spiral groove tube is that the groove pitch p=7 mm and groove depth e=0.4 mm.The further improved design of phase change thermal storage can be realized in later research in-depth.