| The heat storage and release process of heat storage device using phase change materia(lPCM)were researched through numerical simulation and experiment. A kind of organic PCMs and spiral pipe with a straight pipe in the center were used in the device.First of all, the device size was computed according to the building load. Heat storage process was researched using melting or solidification model of FLUENT software, which was a three dimensional and unsteady process. The research can acquire PCM melting temperature and degree of different device in the same initial condition. The result shows that the cylinder heat storage device of spiral pipes with a straight pipe in the center is better in heat storage effect.Second, the experimental platform was built using heat storage device after optimization of numerical simulation and size of device and mass of PCM computed. On the one hand, the heat storage and release characteristics of PCM were researched in the device. On the other hand, the heat storage and release characteristics of PCM were also researched on the condition of different inlet temperature, inlet water velocity and PCM initial temperature. Influence degree of the parameters can be determined and the best plan also can be confirmed. The results show that the utilization rate of paraffin can be improved when the spiral pipes are placed symmetrically in the device. The center line position should be located below the center line of device. The inlet water temperature impacts most to the phase change process of paraffin, while the inlet water velocity and PCM initial temperature impacts less to it.Finally, the established mathematical model is reliable based on the contrast of numerical simulation and experimental results. Initial conditions of numerical simulation were the same to the experiment. The result shows that the numerical simulation conforms to the experimental results, which can provide the basis for the practical application of PCM. |
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