An analytical model for coupled heat and mass transfer processes in solar collector/regenerator using liquid desiccant
An analytical model for coupled heat and mass transfer processes in solar collector/regenerator using liquid desiccant
复制标题
使用液体干燥剂的太阳能集热器/再生器中传热传质耦合过程的分析模型
DOI：
10.1016/j.apenergy.2011.01.027
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发表时间：
2011-07
期刊：
影响因子：
11.2
通讯作者：
Zhang, Xiaosong
中科院分区：
文献类型：
--
作者：
Peng, Donggen;Zhang, Xiaosong
采用液体除湿的太阳能集热/回热器（C/R）将太阳能光热转换和液体除湿的再生结合在一起，有效地实现了太阳能驱动的液体除湿制冷系统的再生。本文通过引入总温差ΔT0和无因次热损失系数h <$z，得到了一组描述太阳能C/R传热传质过程的无因次传热传质方程。为了预测气流的热损失，简化计算，提出了无因次空气温度（θa）和平衡湿度比（YeL）沿着太阳能C/R高度变化的模型。由无因次传热传质驱动势的微分方程和热质守恒方程组成解析解。通过与数值模拟结果的对比，发现在不同的刘易斯因子Le、总温差Δ T0和空气与盐的质量流量比ASMR下，太阳能C/R的出口参数解析结果具有较高的精度。同时，分析了上述参数对再生性能的影响.最后，通过与实验数据的对比，分析计算结果与实验结果吻合较好，验证了分析模型是预测太阳能C/R性能的理想方法。
Solar collector/regenerator (C/R) using liquid desiccant combines solar photothermic transformation and regeneration of liquid desiccant together, effectively achieving the 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 process in the solar C/R were obtained by introducing total temperature difference (ΔT0) and dimensionless heat loss coefficient (h¯z). For the sake of predicting the heat loss of air stream and simplifying calculation, the models of dimensionless air temperature (θa) and equilibrium humidity ratio (YeL) along with the height of solar C/R were put forward. An analytical solution was formed by two differential equations on the dimensionless heat and mass transfer driving potentials and the heat and mass conservation equations. Compared with the numerical simulation results, the analytical results on the outlet parameters of solar C/R have great precision with different Lewis factor Le, total temperature difference ΔT0and air-to salt mass flow rate ratio ASMR. Simultaneously, the effects of above variables on the regeneration performance were analyzed. Lastly, by comparing with the experimental data, the analytical calculation results can agree well with the experimental results validating the analytical model is an ideal way for predicting the performance of the solar C/R.
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