K. Elsawy et al., International Journal of Advanced Trends in Computer Science and Engineering, 9(5),September-October 2020, 8737 – 8746 8737 ABSTRACT In this paper, two systems based on the humidification dehumidification process driven by solar energy were examined. The first system uses a humidifier of the packing type (HPT), while the second system uses a humidifier of the air bubble column type ( temperature, air temperature, water level, air level, and velocity of air were experimentally investigated. It is demonstrated that there is optimum mass ratio obtained to get the maximum water productivity. Moreover, in the HBCT system, there is a maximum value of water level inside the column and also the optimum value of air velocity to get the maximum freshwater productivity. The two systems HPT and HBCT were examined by using the solar collector as a heating source for the saline feed water and the introduced air to the humidifier, and it is found that the freshwater productivity was 8.53 kg/day and 5.04 kg/day for HPT and HBCT systems with a cost of US $17.07 /m 3 and to reduce the carbon dioxide released by 4534 g/day. The results of performance and the economic analysis of the proposed system are comparable to those published for other similar solar desalination systems. Key words:Humidification dehumidification, Packing, Air bubble column, Solar energy, Desalination. 1. INTRODUCTION The world in the future confront energy deficiency and freshwater. Both of them are important in the development of any nation. Desalination of brackish or seawater is one of the most important ways to settle the water scarcity issue in the world. A small size water desalination method is a solution to reproduction fresh water for teeny society. The utilize of solar energy or trash heat sources is suitable for such small size systems for produce water. Humidification dehumidification desalination (HDH) method is appropriate method used in water desalination. The effect of waste energy on HDH desalination system were discussed by Han et al [1]. The performance of the system was analyzed and the gained-output-ratio (GOR) was calculated. By increasing the inlet feed temperature of the sea water side, the GOR and the final water production was increased. Deniz and Cinar [2] discussed the different factors affected the desalination process. They found that the most effective time period of HDH system is between 1:00 pm and 6:00 pm. Moreover, the cost of desalination by HDH systems decreases with increasing efficiency. By increasing the temperatures of water and air at the humidifier inlet, the productivity enhanced. A solar still (SS) incorporated with a solar humidification- dehumidification system is deliberated by EL-samadony et al [3]. The results showed that, solar still unit or HDH unit are not effective individually for desalination and recommended to integrate the SS unit with HDH unit to enhance the performance. Yildrim and Solmus [4] found that, the water production is affected by the inlet water temperature, while the inlet air temperature has a weak influence on the productivity. As the water and air flow rates the productivity increased. Thiel et al. [5] explained the influence of mass extractions and injection on the performance of a fixed-size HDH desalination system. It is inferred that, the most favorable extraction flow rate from the dehumidifier to the humidifier, of the total circuit flow, was about 40%. EL-Shazly et al [6] investigated experimentally the effect of using pulsating liquid flow on the performance of HDH system. The hot seawater was driven through the humidification unit in pulsed flow regime counter current to a continuous airflow forced to the humidifier bottom. The investigated parameters are the pulsation frequency, the pulsation amplitude, the inlet water temperature, the inlet airflow rate and the cooling water flow rate. The best ratio on-off time is found to be 20:60 for enhancing the HDH unit performance and the productivity of water. Kabeel et al [7] examined factors affecting the performance enhancement of the HDH desalination unit by using forced and natural air circulation. Increasing the package area increases the distillate productivity, and the condenser of cylindrical shell and corrugate fins has a rate of heat transfer larger than a rectangular one. The water mass ratio of inlet condenser to hot water at evaporator which gives a maximum productivity should be twice. Li et al. [8] used a HDH process of solar air collector with evacuated tubes. By increasing the temperature of the sprayed water, the humidity improved and the outlet air temperature of humidifier increased. The productivity is improved by using solar air heater collector under the same cooling conditions and air flow rate. Sharqawy et al [9] Experimental investigation of air bubble/packing humidifier for desalination system driven by solar energy K. Elsawy 1 , I.A.Ibrahim 2 , A. Abdelmotalip 3 , Y. Elhenawy 4 1, Mechanical Power Engineering Department, Port-Said University, Egypt,42523,karim_elsawy2007@yahoo.com 2, Mechanical Power Engineering Department, Port-Said University, Egypt,42523,eng.hema@eng.psu.edu.eg 3, Mechanical Power Engineering Department, Port-Said University, Egypt,42523,Abdelhadyelabady@gmail.com 4, Mechanical Power Engineering Department, Port-Said University, Egypt,42523,dr_yasser@eng.psu.edu.eg ISSN 2278-3091 Volume 9, No.5, September - October 2020 International Journal of Advanced Trends in Computer Science and Engineering Available Online at http://www.warse.org/IJATCSE/static/pdf/file/ijatcse263952020.pdf https://doi.org/10.30534/ijatcse/2020/263952020