球式相变蓄热装置传热过程数值模拟与优化
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摘要
以储能球式蓄热装置为研究对象,通过Fluent软件模拟了流体与相变球的对流换热过程,对蓄热装置结构进行了优化设计,分析了球内相变材料在放热过程中的温度场随时间的变化过程,并计算了不同进水和进气流量下蓄热装置的供热参数。结果表明:蓄热装置加装折流挡板且相变球以顺排序列,可以显著增加蓄热装置的有效放热时间;沿着流体路径,球内相变逐渐凝固,且液相率的降低是先快后慢的过程;通过对不同供热参数的热力计算,发现供水流量选取241. 3 L/min、供暖流量选取723. 6 m3/h时,对应的有效供热时间最长,供热量最大。
Taking the energy storage ball type heat storage tank as the research object,the convective heat transfer process of the fluid and the phase change ball was simulated by Fluent software,and the structure of the heat storage tank was optimized. The temperature field,solid-liquid interface and liquidphase ratio of the PCM during the exothermic process were analyzed,and the heating parameters of the heat storage tank under different inlet flow rates were calculated. The results show that effective heat release time is increased obviously by installing baffle and putting the ball in ordering. The phase transition in the sphere gradually solidifies along the fluid path; besides,the decrease of liquid phase rate is a process from fast to slow. Through the calculation of the heat of different heating parameters,it is found that when the water supply flow rate is 241. 3 L/min and the heating flow rate is 723. 6 m~3/h,the effective heating time and heating supply are the maximum value.
Taking the energy storage ball type heat storage tank as the research object,the convective heat transfer process of the fluid and the phase change ball was simulated by Fluent software,and the structure of the heat storage tank was optimized. The temperature field,solid-liquid interface and liquidphase ratio of the PCM during the exothermic process were analyzed,and the heating parameters of the heat storage tank under different inlet flow rates were calculated. The results show that effective heat release time is increased obviously by installing baffle and putting the ball in ordering. The phase transition in the sphere gradually solidifies along the fluid path; besides,the decrease of liquid phase rate is a process from fast to slow. Through the calculation of the heat of different heating parameters,it is found that when the water supply flow rate is 241. 3 L/min and the heating flow rate is 723. 6 m~3/h,the effective heating time and heating supply are the maximum value.
引文
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[2]白青松,郭增旭,刘亦琳,等.通孔金属泡沫强化蓄冰实验研究[J].西安交通大学学报,2018,52(1):20-25.
[3] MBAYE M, BILGEN E. Phase change process by natural convection-diffusion in rectangular enclosures[J]. Heat and Mass Transfer,2001,37(1):35-42.
[4]李曾敏.固体相变蓄热材料的蓄热和放热性能研究[D].重庆:重庆大学,2002.
[5]张仲彬,刘永强,姜铁骝,等.带有空穴的相变胶囊蓄热过程分析[J].化工进展,2017,36(6):2123-2130.
[6] SEDDEGH S, TEHRANI S M, WANG X, et al.Comparison of heat transfer between cylindrical and conical vertical shell-and-tube latent heat thermal energy storage systems[J]. Applied Thermal Engineering,2018,130.
[7]文春明.基于MEMS技术的超级电容器三维微电极阵列制备及表征方法研究[D].重庆:重庆大学,2012.
[8] AGYENIMA F,EAMESB P,SMYTH M. Experimental study on the melting and solidification behaviour of a medium temperature phase change storage material(Erythritol)system augmented with fins to power a Li Br/H2O absorption cooling system[J]. Renewable Energy,2011,36(1):108-117.
[9]郝斌.汽水分离器的仿真建模研究[D].哈尔滨:哈尔滨工程大学,2016.
[10]张毅,张菁燕,黄斌,等.脂肪酸相变材料导热系数测试及相变传热过程的数值模拟[J].功能材料,2012,43(14):1950-1954.
[11]郎涛.水泵试验台不同来流系统的数值模拟与不确定度分析[D].镇江:江苏大学,2009.
[12]梁敏.基于Fluent的粗糙单裂隙水流数值模拟研究[D].合肥:合肥工业大学,2010.
[13]郭少鹏.移动式余热利用系统蓄热器实验和模拟研究及经济性分析[D].天津:天津大学,2013.