Observations made during experimentation on SAH with encapsulated PCM on its absorber plate

A double pass packed bed solar air heater attached with encapsules filled with paraffin wax on its absorber plate is experimentally tested. Encapsules in circular and square cross sections in staggered and inline grid arrangements are used. Mass flow rate of air is changed to 0.00879 to 0.01484 kg/s. The absorber plate with cylindrical capsules in staggered arrangement was attached to SAH on the first day of the experiment and the blower was operated to supply air at a mass flow rate of 0.01484 kg/s. The direct solar radiation was recorded by placing solar power meter (WACO TM-206) perpendicular to the upper glass of the experimental setup. Thermocouples placed at different locations of SAH were connected to a multi-point temperature indicator to manually record temperatures at respective locations. The blower was allowed to run continuously for 30 minutes for each reading to ensure steady-state conditions are attained. Observations were recorded at every 5 minutes within these 30 minutes of time interval. PCM inside the capsules are charged during daytime from 9.45 a.m. to 2.15 p.m. The temperature of the air at SAH inlet and exit, temperatures of packed bed, absorber plate, lower glass, upper glass and PCM in capsules were manually recorded. In between 2.20 p.m. to 4.20 p.m, blower was switched off and the experimental setup was completely placed under insulation covers to minimize the heat loss to the surroundings. After 4.20 p.m. insulation covers were removed and blower was switched on to supply the air. This time PCM discharges stored heat to the air flowing over the capsules. The experiment for discharging process was conducted between 4.20 p.m. to 5.40 p.m. The temperature of the air at SAH inlet and exit, temperatures of packed bed, absorber plate, lower glass, upper glass and PCM in capsules were once again manually recorded.

本研究对一种在吸热板上搭载填充石蜡的封装容器的双程填充床式太阳能空气加热器（solar air heater, SAH）开展了实验测试。实验采用截面为圆形与方形的封装容器，排布方式涵盖错列与顺列网格两种形式。空气的质量流量设置范围为0.00879~0.01484 kg/s。首日实验时，将错列排布的圆柱形封装容器安装至SAH的吸热板上，并启动鼓风机以0.01484 kg/s的质量流量供给空气。通过将太阳能功率计（WACO TM-206）垂直置于实验装置的上玻璃盖板处，记录直接太阳辐射量。将布置于SAH不同位置的热电偶连接至多通道温度记录仪，以手动记录各测点的温度。每次读数前需让鼓风机连续运行30分钟，以确保系统达到稳态工况。在该30分钟的时长内，每5分钟记录一次观测数据。封装容器内的相变材料（Phase Change Material, PCM）于日间9:45至14:15期间完成蓄热。实验期间手动记录SAH进、出口空气温度，以及填充床、吸热板、下玻璃盖板、上玻璃盖板与封装容器内PCM的温度。14:20至16:20期间，关闭鼓风机，并将实验装置完全覆盖于保温隔热罩之下，以最大限度减少向环境的热损失。16:20后移除隔热罩并启动鼓风机供给空气，此时封装容器内的PCM释放储存的热量，对流经其表面的空气进行加热。放热实验的开展时段为16:20至17:40。实验人员再次手动记录SAH进、出口空气温度，以及填充床、吸热板、下玻璃盖板、上玻璃盖板与封装容器内PCM的温度。

搜集汇总

背景与挑战

背景概述

该数据集记录了在双通道填充床太阳能空气加热器（SAH）吸收板上使用封装相变材料（PCM）的实验观测结果，重点关注PCM的充电和放电过程。实验通过改变空气质量流量（0.00879至0.01484 kg/s）和胶囊排列方式（圆形与正方形横截面，交错与直线网格），手动收集了SAH入口出口空气温度、各组件温度及PCM温度数据，时间间隔为5分钟，旨在分析PCM在太阳能热存储中的性能表现。