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Mathematics 2021, 9, 33 11 of 31 Reference [50] Table 1. Cont. The results have concluded that the Fresnel lens has a good efficiency in the range of ~70% for the clear days. The authors have also concluded that at an inlet water temperature of 90 ◦C, the flow rates were 27 and 40.8 litre/h/m3 of feed saline water for open and closed systems, respectively. Description The work presents an experimental and a theoretical model for the utilization of Fresnel lens in solar water desalination system working on the humidification-dehumidification principle. The thermodynamic analysis considering the mass and energy balance equations are developed for the following processes: water heater, humidifier, and other cycle components. The models were solved numerically, and the validation process has shown that the model outcomes are 25% higher than the experimental data owing to some energy losses. A humidification-dehumidification desalination unit having bubbler humidifier and thermoelectric cooler for the dehumidification purposes is presented with a theoretical and an experimental justification to evaluate the influence of temperature of air and water, the diameter of the hole on the periphery of circling tube, the height of hot water column, and the air mass flow rate in the performance indicator i.e., production of freshwater. Findings Location of the Analysis Egypt Demonstration Dates of the Analysis Gaps with the Current Work The components of the work of reference [50] are different from the current work because the authors of reference [50] have utilized a Fresnel lens; however, the current work utilizes a flat-plate solar collector. Owing to many other basic differences along with problem formulation, research design, and methodology, the outcomes/findings and conclusion of both of the works are quite different. The equipment utilized for the humidification and the dehumidification of the work of reference [51] is different from the one employed in this work. - [51] It is concluded that the achieved daily distillate production was in the range of 7 to 13 litres per day for different operational conditions; whereas the maximum productivity of the system was 12.96 litre per day for a hole diameter of 2mm, the mass flow rate of air of 0.016 kg/s, the water temperature of 60 ◦C, air temperature of 27 ◦C, and column height of 7cm. India -PDF Image | Humidification Dehumidification Solar Desalination System
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