Increasing population combined with pollution of water bodies makes human being on this earth fully dependent on purified or desalinated water Keeping in mind the end goal to take care of the demand for consumable water, desalination systems of different kind have been proposed by many industrial establishments and research groups. Among the known water purification system Humidification Dehumidification (HDH) has become popular due to its simple operation, economic viability, absence of skilled labor and dependence on green and low grade energy to power the system. The theoretical analysis has been carried out using a simulation code in �C� language to study the performance and quantity of output at various operating conditions. Results demonstrate that with increment in the mass flow rate of water and air, the effect of productivity on desalinated water increases and decreases respectively. In addition, the freshwater output increases with decrease in the heat input which is favorable for the enhancement of desalination efficiency. © 2019, Novel Carbon Resource Sciences. All rights reserved.