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Mathematical model and energy efficiency analysis of a vacuum-based liquid desiccant regenerator

机译：真空基液体干燥剂再生器的数学模型和能效分析

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摘要

Liquid desiccant air conditioning (LDAC) has been considered as a promising solution for efficient air temperature and humidity control in air conditioning fields. However, the high regeneration temperature of desiccant solution impedes its spread and application. In this study, a vacuum-based liquid desiccant regenerator (VLDR) for desiccant solution regeneration in LDAC driven by low-grade energy is studied, meanwhile, the mathematical model considering the variation of heat transfer coefficient under different operating conditions is developed to analyze the system performance and energy efficiency. After the model is validated by the experimental data, the regeneration performance and energy efficiency analysis of the VLDR system is simulated and investigated. Simulation results show that hot water temperature, flowrate are the variables that affect the performance of the generator, and the performance of the condenser is influenced by cooling water temperature and flowrate. Opposite influences for vacuum pressure are found on the performances of generator and condenser, therefore the hot water temperature, vacuum pressure, and cooling water temperature should be designed properly to provide the required regeneration capacity with the pressure balance maintained. Moreover, energy efficiency is analyzed by comparing the ratio of water vapor generation rate to the total electricity consumption of the VLDR under different temperatures and vacuum pressures.
机译：液体干燥剂空调（LDAC）被认为是用于空调场中有效的空气温度和湿度控制的有希望的解决方案。然而，干燥剂溶液的高再生温度阻碍了其扩散和应用。在该研究中，研究了通过低级能量驱动的LDAC的洗涤剂溶液再生的真空基液滴再生器（VLDR），同时，考虑到不同操作条件下的传热系数变化的数学模型进行了分析系统性能和能效。通过实验数据验证模型后，模拟并研究了VLDR系统的再生性能和能效分析。仿真结果表明，热水温度，流量是影响发电机性能的变量，电容器的性能受冷却水温和流量的影响。对发电机和冷凝器的性能来说，对真空压力的相反影响，因此应适当地设计热水温度，真空压力和冷却水温度，以提供所需的再生能力。此外，通过将水蒸气产生速率与不同温度和真空压力的总电消耗的比较来分析能量效率。

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