基于NTU的太阳能溶液集热/再生器性能分析

太阳能溶液集热/再生器是集太阳能光热转化和溶液再生于一体的装置，它能有效实现太阳能溶液除湿蒸发冷却系统的溶液再生。通过自定义总温差（ΔT₀）和量纲1散热系数两个变量，得到以传热单元数为自变量的量纲1耦合传热、传质模型，并通过与相关实验对比对模型进行了验证。通过对空气和溶液入口参数变化对溶液集热再生性能影响分析，发现空气入口温度提高12℃、湿度降低12 g•kg^-1，溶液出口浓度升幅分别提高30%和70%以上；溶液入口温度提高30℃，溶液出口浓度升幅提高160%以上。对4组量纲群分析，得到传热单元数NTU、流量比ASMR、总温差ΔT0和Lewis数Le的增加都能促进溶液再生。逆流再生比顺流再生的出口浓度增幅能提高10%左右。

Analysis of performance of solar liquid collector/regenerator based on NTU

Solar liquid collector/regenerator combines solar photothermic transformation and liquid regeneration，effectively achieving liquid regeneration for solar energy-driven liquid desiccant cooling systems.In this paper a group of dimensionless heat and mass transfer equations describing the heat and mass transfer processes in the solar liquid C/R can be obtained by defining total temperature difference（ΔT₀）and dimensionless heat loss coefficient and validated by comparing with the related experimental data.Through the analysis of effect of inlet parameters of air and solution on the regeneration performance，it was found that when the air inlet temperature rose by 12℃ and humidity ratio decreased by 12 g•kg^-1，the increment of outlet concentration of solution increased by above 30% and 70% respectively and when the solution inlet temperature rose by 30℃，the increment of outlet concentration of solution raise increased by above 160%.From the effect of four kinds of variable groups，the increase of number of heat transfer units（NTU），flow rate ratio，total temperature difference ΔT₀ and Lewis factor Le could promote the regeneration of solution.Compared to the parallel-current regeneration，the increment of solution concentration in the counter-current regeneration case could increase by about 10%.