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On the other hand, the effect of air temperature on the productivity of the HDHSDS is insignificant.

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This novel HDH system uses advantages of ETC-HP as a highly efficient thermal absorption and conductor device, and at the same time employs the advantages of an air bubble column humidifier, i.e.

high interface area and effective mixing in order to heat the water and humidify the air, respectively.

The overall objective of this work is to investigate the main operating parameters of the new humidifier.

The study addresses the significance of the perforated plate geometric features, optimum balance of air superficial velocity and water column height, and the influence of inlet water temperature and inlet air relative humidity on the performance of the humidifier.

Three set of experiments is performed by integrating the HDH system with conventional solar air heater (case I), by integrating with solar air heater containing turbulators (case II), and by integrating with dual purpose solar collector containing turbulators (case III).

Turbulators in the air flow field of solar collector enhances the exit air temperature.The performance of the system is improved with the increase in air and cooling water flow rate.Gained output ratios of about 2, 2.8, 3.3 and productivities of around 16.32, 20.61, 23.92 kg/m²day are observed in the case I, case II and case III respectively.The change in the temperature difference along the column is less than 2.5 °C for all measurements.The best performance is observed from sieve with 1 mm hole diameter at which the outlet air from the bubble columns is always saturated.The estimated cost of fresh water produced through the HDH system designed is 0.028 $/L.

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