發(fā)布時間：2018-10-30 07:03

【摘要】：目的研究多種影響因素下的相變儲能水箱蓄放熱性能,優(yōu)化相變儲能水箱設(shè)計參數(shù).方法以CFD軟件為平臺,從4個方面模擬了11組相變儲能水箱的蓄放熱情況,確定最優(yōu)的相變儲能水箱設(shè)計參數(shù).結(jié)果模擬結(jié)果表明,采用直徑30 mm相變封裝單元的水箱蓄放熱速度比采用40 mm和50 mm相變封裝單元的水箱更快.放熱階段應(yīng)在滿足供熱需求的前提下選取較小的水箱進(jìn)水流速.相變材料(PCM)的導(dǎo)熱系數(shù)提高0.1 W/(m·K),節(jié)省了近50%的蓄放熱時間.相變封裝單元交錯排列時相變儲能水箱蓄放熱效果好于順序排列.最后選取最優(yōu)的設(shè)計參數(shù)進(jìn)行模擬,模擬結(jié)果顯示放熱時水箱出水被加熱2℃以上的時間為1.45 h,占總放熱時間的63%.結(jié)論筆者分析得出的結(jié)果將為實際相變儲能水箱的設(shè)計提供參考,有利于提高相變儲能水箱的蓄放熱性能.
[Abstract]:In order to optimize the design parameters of phase change energy storage tank, the heat storage performance of phase change storage tank is studied. Methods based on CFD software, the heat storage and discharge of 11 groups of phase change energy storage tanks were simulated from four aspects, and the optimal design parameters of phase change energy storage tanks were determined. The simulation results show that the heat storage rate of water tank with 30 mm diameter phase change packaging unit is faster than that with 40 mm and 50 mm phase change packaging unit. In the exothermic stage, the smaller inlet velocity of water tank should be selected on the premise of satisfying the heating demand. The thermal conductivity of phase change material (PCM) was increased by 0.1 W / (m K), and the heat storage and exothermic time was saved by nearly 50%. The heat storage and exothermic effect of phase change storage tank is better than that of sequential arrangement when phase change packaging units are staggered. At last, the optimal design parameters are selected to simulate. The simulation results show that the time when the effluent of the tank is heated above 2 鈩，

本文編號：2299291