环形相变单元的蓄热装置设计及运行特性

通过对圆柱和圆环相变单元进行蓄放热性能实验,发现环形结构可有效降低蓄放热时间,提高相变材料蓄放热速率。采用环形相变蓄热单元,设计了一种新型相变蓄热装置,搭建了相变蓄热实验系统,对蓄热装置运行特性进行了分析。结果表明:蓄热工况下,增加换热流体流量,提高换热流体温度,可明显提高蓄热速率;放热工况下,增加换热流体流量可加快蓄热装置的热释放速率,但流量过大相变潜热无法及时释放,在冷水补水流量为4 L/min时,可多提供约44 L温度高于40℃的热水。根据实际生活用水,对间隔用水分别为5 min和10 min两种工况进行了放热实验,同样可以满足用水需求。

Design and Operating Characteristics of Heat Storage Device for Annular Unit

Experiments were carried out to study the thermal performance of cylindrical and annular units. The results show that the annular structure effectively reduces the heat storage time and improves the heat storage rate of phase change materials. A novel phase change heat storage device is designed using annular units, and a phase change heat storage experiment system is set up to analyze the operation characteristics of the heat storage device. The results show that the rate of heat transfer is significantly improved when the flow rate and temperature of the heat transfer fluid increase. Under the discharge conditions, the rate of heat transfer is significantly improved when the flow rate of the cold fluid increases within a reasonable range. The heat storage device provides more than 44 L of hot water at a cold water flow rate of 4 L/min. According to the water usage conditions, the performance that water was supplied intermittently every 5 min and 10 min were investigated experimentally, and the results show that the water demand could be satisfied.