强制循环闭式太阳能供热系统数值模拟

太阳能技术已经逐渐地应用到供热系统之中,太阳能供热系统的工作机理之一就是水循环系统的流动吸热和散热过程,如何提高该过程产生的热效率是推广太阳能供热系统应用的关键.建立了强制循环闭式太阳能供热系统的三维数值模型,然后用CFD软件对其进行分析.研究结果表明:1) 在模拟强制循环闭式太阳能供热系统中,雷诺数和光照时间对系统影响较大;2) 在雷诺数为1 500、1 000、500时,经过实际1.5 h的模拟后系统内的最高温度分别为310 k、312 k、317 k;3) 强制循环系统中水温分层分布,且系统的得热量随雷诺数的减小而增大.

Numerical Simulation of Forced Convection Closed Loop Solar Water Heating System

The solar energy technology has been gradually applied to the heating systems, one of the working mechanisms of the solar energy heating system is endothermic and thermal in the flowing process, and the key of promoting the application of solar energy heating system is enhancing the thermal efficiency in the process. In this paper, the three-dimensional numerical model of the forced convection closed loop solar water heating system was established, and then analyzed the simulation date using the CFD. The results show that: 1) the Reynolds number and the illumination time have a greater impact on the heating system at simulating the forced convection closed loop solar water heating system; 2) when the Reynolds number 1500, 1000,500, the maximum system temperatures are 310k, 312k, 317k after 1.5 hours of simulated practices; 3) the temperatures are distributed stratifiedly in forced loop system, and the system heat increase during the decrease of the Reynolds number.