Composite metal foam/PCM energy store design for dwelling space air heating
Composite metal foam/PCM energy store design for dwelling space air heating
复制标题
DOI：
10.1016/j.enconman.2019.112151
复制
发表时间：
2019-12-01
影响因子：
10.4
通讯作者：
Gillott, Mark
中科院分区：
文献类型：
--
作者：
Sardari, Pouyan Talebizadeh;Grant, David;Gillott, Mark
本数值研究的目的是开发一种潜热储存（LHS）空气加热器，在进料和出料过程中找到住宅空间加热的几何和操作条件。蓄热式加热器的目的是在所需的加热时间内，根据典型房间所需的热负荷提供均匀的输出温度。相变材料（PCM）嵌入在铜多孔结构中，以提高传热速率并克服相变材料的低导热性。首先对排料过程进行了几何参数分析，根据排料时间和空气输出温度，得到了排料高度、风道宽度、PCM壳体宽度、空气质量流量等几何参数。然后，对充电机构进行评估，以找到所采用的矩形加热元件所需的面积。结果表明，金属泡沫/ pcm -空气复合换热器在排料时间（减少56.5%）和输出温度均匀性方面均优于单纯的pcm换热器。该系统高度为30 cm， PCM和风道厚度分别为15 cm和2 cm，深度为1 m，能够在空气质量流量为0.01 kg/s的情况下提供所需的47℃输出温度近17.4 h。充电分析表明，所需的矩形加热元件的尺寸为15 x 60 cm，恒温温度为100℃，位于装置两侧。
The objective of this numerical study is to develop a latent heat storage (LHS) air heater in both charging and discharging processes to find the geometrical and operating conditions for dwelling space heating. The aim of the storage heater is to provide a uniform output temperature according to the required heating load of a typical room in the required heating hours. The phase change material (PCM) is embedded in a copper porous structure to enhance the rate of heat transfer and overcome the low thermal conductivity of PCMs. The geometrical parameters is first obtained from analysing the discharging process including the height, air channel and PCM shell widths and air mass flow rate according to the discharging time as well as the output temperature of the air. Then, the charging mechanism is assessed to find the required area for the employed rectangular heating element. The results show the significant advantages of composite metal foam/PCM-air heat exchanger in comparison with the PCM-only unit on both the discharging time (56.5% reduction) and the uniformity of output temperature. The system with the height of 30 cm, PCM and air channel thickness of 15 cm and 2 cm, respectively, and a depth of 1 m, is capable to provide the desired output temperature of 47 degrees C for almost 17.4 h with the air mass flow rate of 0.01 kg/s. The charging analyses shows that the dimensions of the required rectangular heating element with constant temperature of 100 degrees C is 15 x 60 cm located at both sides of the unit.