基于聚光太阳能电池冷却的微射流热沉传热性能数值研究

Numerical study on heat transfer performance of microjet heat sink based on concentrating solar cell cooling

中文关键词: 聚光太阳能电池  微射流热沉  回流通道  数值模拟

英文关键词: concentrating solar cell  microjet heat sink  return channel  numerical simulation

中文摘要:

      针对高倍聚光比下太阳能电池的热致失效问题，设计了一种带有回流结构的矩阵式微射流热沉。建立了热沉的三维物理和数学模型。并采用计算流体力学(CFD)软件对其进行了数值模拟，研究了回流通道数目、回流孔分布位置、射流高径比等因素对微射流热沉传热和流动特性及热有效性的影响。结果表明：在稳态条件下，回流孔数为49个结构的热沉性能比回流孔数为25个的热沉换热性能要好;当回流孔数目不变时，射流高径比(H/d)越小的热沉换热性能较好；被冷却表面平均温度随气体射流雷诺数增大而降低；系统压损随着射流雷诺数的增大不断增大；射流雷诺数大于5000以后，压损急剧增加。对于回流孔数为49的热沉，当运行参数4600≤Rea≤6663，换热面热流密度为4.22 W/cm2时，在不同的射流高径比下对比，H/d = 4时换热性能最好。

英文摘要:

      To solve the problem of thermal-induced failure of solar cells under high concentration ratio, a matrix microjet heat sink with return channel was designed. The three-dimensional physical and mathematical models of heat sink were established. Numerical simulation was carried out by computational fluid dynamics (CFD) software, the effects of the number of return channels, the distribution of return holes, the ratio of the distance between the microjet and the cooled surface to the diameter of the microjet heat sink (H/d) on heat transfer and flow characteristics and thermal efficiency of the microjet heat sink were studied. The results show that under the steady-state condition, the performance of the heat sink structure with 49 return channels is better than the heat sink structure with 25 return channels. With a certain number of return channels, the heat transfer performance of the heat sink with low H/d of the microjet heat sink is better. The average temperature of the cooled surface decreases with the increase of jet Reynolds number. The pressure loss of the system increases with the increase of jet Reynolds number. When the jet Reynolds number is greater than 5000, the pressure loss increases dramatically. When the microjet heat sink with 49 return channels for different H/d is working under 4600≤Rea≤6663 and the heat flux density at 4.22 W/cm2, the calculated results show that the performance of the microjet heat sink with H/d=4 is best.