Experimental study on optimum performance of two-stage air-heated bubble-column humidification–dehumidification system

IF 1 4区 环境科学与生态学 Q4 WATER RESOURCES
None Majid Khan, None M Faizan, None Mohamed A Antar, None Atia E Khalifa
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Abstract

An experimental investigation of a small-scale air-heated humidification–dehumidification (HDH) desalination system with bubble-column humidification and dehumidification units was conducted. The study addressed the performance of the multistage air-heated bubble-column HDH system, which has limited coverage in the literature, by operating two bubble-column humidifiers in series for the air humidification process with air reheating. The effect of operating parameters such as airflow rate, air temperature, and saline water levels in both humidifiers on the performance metrics of the system were investigated. The product distillate rate, energy consumption, gain output ratio (GOR), and specific energy consumption (SEC) are the main indicators of performance for the proposed desalination system. Response surface methodology (RSM) was applied to the current system using the design of experiment (DoE) for the prediction of variables that greatlyaffect productivity and energy input. The airflow rate, air temperature, and water level of the second humidifier have a favourable effect on the distillate rate and GOR of the system. In contrast, the effect of the water level inside the first humidifier is insignificant. Furthermore, the RSM optimization approach was used to obtain the optimum distillate productivity. An optimized distillate rate of 0.45 L/h and a GOR of 0.4 are achieved at 1.5 SCFM (standard cubic feet per minute) of airflow rate, and 6.5 cm of water level in the second humidifier with 140°C air inlet temperature. The numerical optimization reveals the optimal operating parameters, that correspond to maximum distillate production of 0.3 L/h with minimum input energy of 0.71 kW, to be 139°C air temperature, 1.13 SCFM of airflow rate, 6.5 cm and 3 cm water levels of second and first humidifier, respectively.
两级空气加热气泡柱加湿-除湿系统最佳性能的实验研究
对具有气泡柱加湿和除湿装置的小型空气加热加湿-除湿海水淡化系统进行了实验研究。该研究通过在空气再加热的空气加湿过程中串联运行两个气泡柱加湿器,解决了多级空气加热气泡柱HDH系统的性能问题,这在文献中覆盖面有限。研究了两个加湿器的气流速率、空气温度和含盐水位等运行参数对系统性能指标的影响。产品馏出率、能耗、增益输出比(GOR)和比能耗(SEC)是该脱盐系统的主要性能指标。将响应面法(RSM)应用于现有系统,利用实验设计(DoE)对影响生产率和能源投入的变量进行预测。第二加湿器的风量、空气温度和水位对系统的馏分率和GOR有良好的影响。相比之下,第一加湿器内部水位的影响是微不足道的。在此基础上,采用RSM优化方法获得最佳馏出物产率。优化的馏分率为0.45 L/h, GOR为0.4,风速为1.5 SCFM(标准立方英尺/分钟),第二个加湿器的水位为6.5 cm,进气温度为140°C。数值优化结果表明,在最小输入能量为0.71 kW的情况下,达到最大馏分产量0.3 L/h的最佳运行参数为:空气温度139℃,气流速率1.13 SCFM,第二和第一加湿器水位分别为6.5 cm和3 cm。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Water SA
Water SA 环境科学-水资源
CiteScore
2.80
自引率
6.70%
发文量
46
审稿时长
18-36 weeks
期刊介绍: WaterSA publishes refereed, original work in all branches of water science, technology and engineering. This includes water resources development; the hydrological cycle; surface hydrology; geohydrology and hydrometeorology; limnology; salinisation; treatment and management of municipal and industrial water and wastewater; treatment and disposal of sewage sludge; environmental pollution control; water quality and treatment; aquaculture in terms of its impact on the water resource; agricultural water science; etc. Water SA is the WRC’s accredited scientific journal which contains original research articles and review articles on all aspects of water science, technology, engineering and policy. Water SA has been in publication since 1975 and includes articles from both local and international authors. The journal is issued quarterly (4 editions per year).
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