A novel configuration of humidification dehumidification (HDH) desalination system is presented using direct contact bubble column (BC) humidifier and dehumidifier. Experiments are carried out for performance analysis and comparison between a single‐stage, HDH air heated system (one humidifier and a dehumidifier) and a double‐stage HDH system (two BC humidifiers with air reheating). Effect of various operating parameters such as airflow rate, air temperature, and humidifier water levels is studied on performance metrics such as productivity, gain output ratio (GOR), input energy, specific energy consumption, and effectiveness. Results show that higher airflow rate, air temperature, and humidifier water level favor the system performance. The single‐stage system has a maximum productivity rate of 0.19 L/h and GOR of 0.21 obtained at 140°C and 1.5 standard cubic feet per minute (SCFM). However, the productivity of the single‐stage HDH system is limited due to low air outlet temperature at the exit of the BC humidifier. The double‐stage humidification system performs better in terms of productivity and GOR. The two‐stage humidification HDH system produced a distillate rate of 0.46 L/h and GOR of 0.4 with thermal energy increment of only 0.27 kW compared to the single‐stage system. The obtained results are promising in comparison with previous HDH studies, especially of air heated cycle. The estimated cost of production is 0.090 USD/L for double‐stage HDH BC.

中文翻译：

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风热鼓泡塔加湿除湿脱盐系统的实验研究

提出了一种使用直接接触式鼓泡塔（BC）加湿器和除湿器的新型加湿除湿（HDH）脱盐系统配置。对单级HDH空气加热系统（一个加湿器和一个除湿器）和双级HDH系统（两个带空气再加热的BC加湿器）之间的性能分析和比较进行了实验。研究了诸如空气流速，空气温度和加湿器水位等各种操作参数对性能指标的影响，这些性能指标包括生产率，增益输出比（GOR），输入能量，比能耗和效率。结果表明，较高的气流速率，空气温度和加湿器水位有利于系统性能。单级系统在140°C和1下的最大生产率为0.19 L / h，GOR为0.21。每分钟5标准立方英尺（SCFM）。但是，由于BC加湿器出口处的空气出口温度低，单级HDH系统的生产率受到限制。双层加湿系统在生产率和GOR方面表现更好。与单级系统相比，两级加湿HDH系统产生的馏出液率为0.46 L / h，GOR为0.4，热能增量仅为0.27 kW。与以前的HDH研究相比，所获得的结果很有希望，尤其是在空气加热循环方面。双层HDH BC的估计生产成本为0.090 USD / L。双层加湿系统在生产率和GOR方面表现更好。与单级系统相比，两级加湿HDH系统产生的馏出液率为0.46 L / h，GOR为0.4，热能增量仅为0.27 kW。与以前的HDH研究相比，所获得的结果很有希望，尤其是在空气加热循环方面。双层HDH BC的估计生产成本为0.090 USD / L。双层加湿系统在生产率和GOR方面表现更好。与单级系统相比，两级加湿HDH系统产生的馏出液率为0.46 L / h，GOR为0.4，热能增量仅为0.27 kW。与以前的HDH研究相比，所获得的结果很有希望，尤其是在空气加热循环方面。双层HDH BC的估计生产成本为0.090 USD / L。