Performance evaluation of variable pressure humidification-dehumidification systems
Performance evaluation of variable pressure humidification-dehumidification systems
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DOI：
10.1016/j.desal.2017.01.025
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发表时间：
2017-05
期刊：
影响因子：
9.9
通讯作者：
O. Siddiqui;Mostafa H. Sharqawy;M. Antar;S. Zubair
中科院分区：
文献类型：
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作者：
O. Siddiqui;Mostafa H. Sharqawy;M. Antar;S. Zubair
典型的加湿除湿海水淡化（HDH）系统在环境压力下运行。然而，目前的工作提出了一种HDH系统，可以在不同的压力下工作，以提高其性能。系统参数优化，以最大限度地提高增益输出比（GOR）。此外，还研究了质量比、压力比、组分有效性和系统最高温度的影响。研究发现，当效率为0.8，加湿器压力为50kpa时，压力比为1.33时，最大GOR值为3.8（效率为0.9时，GOR值为8.2）。对影响系统性能的主要参数进行了灵敏度分析。研究发现，GOR对加湿器和除湿器的压力更为敏感（在考虑的变量中，压力对GOR的贡献为32%）。此外，还进行了火用分析，以确定导致系统中较高火用破坏的参数。结果表明，在60℃以下，压力比的增加增加了不可逆性，而最高温度对火用破坏没有影响。
A typical humidification dehumidification desalination (HDH) system operates at ambient pressure. However, the current work presents an HDH system that works at different pressures in order to improve its performance. The system parameters are optimized to maximize the Gain Output Ratio (GOR). In addition, the effect of the mass ratio, pressure ratio, effectiveness of components, and the maximum temperature of the system is studied. It is found that for an effectiveness of 0.8 and humidifier pressure of 50 kPa, a maximum GOR of 3.8 is obtained at a pressure ratio of 1.33 (GOR value of 8.2 is obtained for the effectiveness of 0.9). Sensitivity analysis is also performed to determine the main parameters that affect the system performance. It has been found that GOR is more sensitive to the pressures of humidifier and dehumidifier (32% contribution of pressure on the GOR among the variables considered). In addition, an exergy analysis is performed to determine the parameters that result in higher exergy destruction in the system. It is found that increasing the pressure ratio increases the irreversibility while maximum temperature has no effect on exergy destruction up to 60 °C.