TY - JOUR
TI - Application of performance dynamic equationin numerical simulation and optimization of waste heat utilization and storage system
AU - Li Feng
JN - Thermal Science
PY - 2024
VL - 28
IS - 2
SP - 1253
EP - 1261
PT - Article
AB - In order to improve the current situation of double energy loss in waste heat  recovery and utilization, according to the factors such as phase change  temperature, thermal conductivity, phase change latent heat, economy, and  safety of thermal storage materials, 70# phase change thermal storage balls  produced by XX company were selected as phase change thermal storage  materials, and differential scanning calorimetry was used to test and  analyze them, and the melting point, freezing point and phase change latent  heat value of PCM were obtained, provide data reference for simulation in  the following text. The shell and tube heat exchanger is selected as the  core component of the mobile heat storage system, and its heat storage and  release processes are simulated using FLUENT software. The results show that  when the heat transfer equipment is charged for 7 hours, almost all of the  inner-heat exchangers have completed the heat supply, and only the phase  change products at both sides and bottom of the heat supply have "dead  zone", which is the major effect of heat storage. In order to improve the  heat storage and release rate and break the "bottleneck" of heat storage,  the heat transfer was strengthened by changing the diameter size,  arrangement, and adding fins of the heat exchange tube. The effects of  straight fins, T-shaped fins, as well as the number, height, thickness, and  width of fins on the heat storage performance were explored. The results  indicate that, adding fins cannot only improve heat transfer efficiency, but  also inhibit natural-convection. The heat storage and release time decreases  to varying degrees with the increase of fin width, thickness, height, and  the number of circumferential fins in a single heat exchange tube.