配合集热器的盐梯度太阳池热性能实验与分析

Experiment and analysis of thermal performance for salt-gradient solar pond with solar collector

构建表面积为1.50 m×1.50 m的小型实验用盐梯度太阳池,并与平板太阳能集热器配合使用,分别对普通太阳池和集热增强型太阳池进行了储热、放热实验。实验研究与理论分析表明:单独盐梯度太阳池的放热量为3.5×103k J,热效率为13.6%;集热增强型太阳池放热量可以达到4.8×103k J,且热效率增至28.1%。另外后者下对流层温度最高可提升10℃以上,从而证明太阳能集热器可以有效提高太阳池热效率,增加下对流层储热量。此外,考虑了放热过程换热器对太阳池下对流层的扰动,对比实验前后的溶液浓度,可以看出实验后太阳池盐度曲线合理,非对流层呈良好梯度分布,太阳池稳定性并未遭到破坏。

A small experimental gradient solar pool with a surface area of 1.50 m × 1.50 m was constructed. Heat storage and dissipation experiments were carried out on the ordinary and heat enhanced solar pool combined with a flat solar collector. The experimental and theoretical analyzes results show that the heat dissipation of solar pool is 3.5× 103 kJ and the thermal efficiency is 13.6%. However, for enhanced solar pool, the heat dissipation and the thermal efficiency increase to be 4.8× 103 kJ and 28.1%, respectively. Additionally the lower convective zone （LCZ） temperature is increased by more than 10 ℃, which verifies that the solar collectors can improve the thermal efficiency and enhance the heat storage of lower troposphere. Moreover, the concentration of the solution before and after the experiment were compared by considering the disturbance of the heat exchanger to non-convective zone （NCZ） of the solar pond. It can be seen that the salinity curve of the solar pool is reasonable, the NCZ shows a good gradient distribution, and the stability of the solar pool is not destroyed.