Dynamic behaviour simulation of a liquid desiccant dehumidification system
Dynamic behaviour simulation of a liquid desiccant dehumidification system
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DOI：
10.1016/j.energy.2017.11.161
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发表时间：
2018-02
期刊：
影响因子：
9
通讯作者：
A. Kabeel;A. Khalil;S. S. Elsayed-S.;A. M. Alatyar
中科院分区：
文献类型：
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作者：
A. Kabeel;A. Khalil;S. S. Elsayed-S.;A. M. Alatyar
在热驱动空调系统中，液体除湿空调系统可以通过低水温太阳能集热器来辅助。这可以减少空调系统的电力需求。此外，这些系统可以提供以液体干燥剂溶液中的化学能或太阳能收集器热水中的热能的形式的能量存储的可能性。本文采用两种动态模型：瞬态模型和离散稳态模型对液体除湿制冷循环进行了模拟。瞬态模型考虑了除湿器/再生器模型和液-液热交换器模型的控制方程中的非稳态项。而在另一种动态模型中，仅使用稳态项。相应地，液体除湿除湿除湿系统的构建，故障排除和现场测试在夏季条件下。仿真结果表明，所建立的动态模型能适应工况变化和供热水的变化。此外，湿度比之间的偏差，从模拟结果和现场测试的模拟溶液浓度的影响，小于4%的偏差。模拟和测试的水分去除率结果之间的最大偏差在除湿器中为-0.21g/s，在再生器中为-0.5g/s。因此，所建立的溶液除湿系统动态模型能够可靠地预测溶液除湿系统在溶液存储模式下的性能，仿真结果的比较表明，所采用的两种动态模型之间的差异并不显著。然而，瞬态模型比离散稳态模型减少了21%的计算时间。这可以加快处理时间。
Among heat driven air conditioning systems, liquid desiccant air conditioning system can be assisted by low water temperature solar collectors. This can reduce the electricity demand of the air conditioning systems. Furthermore, these systems can provide possibility of energy storage in the form of chemical energy in the liquid desiccant solution or thermal energy in the solar collector hot water. This article simulates a liquid desiccant dehumidification cycle by two dynamic models: transient and discrete-steady state model. The transient model takes into consider the unsteady term in the governing equations for both the dehumidifier/regenerator model and also liquid-liquid heat exchanger model. While, in the other dynamic model, the steady state terms are used only. Correspondingly, a liquid desiccant dehumidification system was constructed, troubleshoot and field tested at summer conditions. According to the simulation results, the dynamic models are compatible with the variances in operating conditions and supply heating water. Also, the deviation between the humidity ratio results from simulation and field test effects on the simulated solution concentration with less than 4% deviation. The maximum deviation between the moisture removal rate results from simulation and test are −0.21 g/s in the dehumidifier and −0.5 g/s in the regenerator. Thus, the models of liquid desiccant system have reliability to predict the performance with solution storage mode.The comparison between simulation results shows that the disagreement between the two employed dynamic models is insignificant. However, the transient model reduces the computational time by 21% less than the discrete-steady state model. This can speed up the processing time.