Abstract
A simulation model of shell and tube phase change energy storage heat exchanger was established in this paper, and the heat transfer characters of the studied heat exchanger was analyzed under the energy storage and energy release conditions by Fluent software. The change reasons of hourly heat exchange intensity were analyzed based on the three aspects of temperature field, velocity field and solid-liquid interface. The influence of heat source tube wall temperature and caliber of heat pipe on heat transfer efficiency was discussed. The results show that the effects of thermal agitation and natural convection on the studied heat exchanger performance are obvious under the heat storage condition, and the liquid fraction reaches 95% at 10000 s. The heat conduction is dominated under the heat release condition, and there is only 75% of the phase change material solidified at 60000 s. Based on the analysis of the field synergy theory, the heat transfer time is shorter when the pipe diameter reduces, however, the heat transfer rate in per unit area is decreased significantly. It is indicated that the heat transfer efficiency begins to decline when the heat transfer temperature difference is less than 20℃.
| Translated title of the contribution | Performance study and field synergy analysis of shell and tube phase change energy storage heat exchanger |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 226-233 |
| Number of pages | 8 |
| Journal | Taiyangneng Xuebao/Acta Energiae Solaris Sinica |
| Volume | 41 |
| Issue number | 3 |
| State | Published - 28 Mar 2020 |
