多管阵列相变储热装置在日光温室的应用研究

Application of a Multi Tube Array Phase Change Thermal Energy Storage Device in Solar Greenhouses

为研发适用于日光温室的简易相变储热装置,本文提出一种基于硬脂酸丁酯相变材料的多管(PVC)阵列储热结构,改造新疆吐鲁番的一个既有日光温室,实验研究改造后的日光温室热环境。结果表明:相同光照时间(冬季光照6 h)条件下,黑表面储热装置的蓄热量比白表面大66.7%;对比三种直径PVC管材硬脂酸丁酯蓄热体,直径75 mm最为适合。与传统日光温室对照,采用多管阵列储热的日光温室的夜间平均温度提高1.2℃以上,硬脂酸丁酯的单位实际蓄热量可达163 kJ/kg(包含显热)。本文多管阵列储热结构具有造价低、安全可靠、简单易行等特点,可在日光温室规模化应用。

This study proposed a multi-tube(polyvinyl chloride,PVC)array thermal energy storage structure based on butyl stearate phase change material,aiming to develop a simple and low-cost thermal energy storage device for solar greenhouses.The thermal environment of a greenhouse with a multi-tube array thermal energy storage device was studied through a series of experiments.The results indicated that the heat storage capacity of the device with a black surface was 66.7%higher than that with a white surface under similar irradiation conditions.Compared to devices with diameters of 50 mm and 110 mm,the discharging performance was the best when using a 75 mm PVC pipe containing butyl stearate.Moreover,in contrast to traditional solar greenhouses,the nighttime average temperature of the solar greenhouse with the multi-tube array thermal energy storage device was higher by more than 1.2℃,and the in-situ thermal energy storage capacity of the unit with butyl stearate reached 163 kJ/kg(including sensible heat).Therefore,multi-tube array thermal energy storage devices,which are economical,safe,and simple,can be widely applied in solar greenhouses.