A hybrid solar desalination process of the multi-effect humidification dehumidification and basin-type unit

This paper presents a hybrid solar desalination process of the multi-effect humidification dehumidification and the basin-type unit. The sketch of the hybrid solar desalination process is given. The solar vacuated tube collector is employed in the desalination system, multi-effect humidification dehumidification desalination (HDD) process is plotted according to pinch technology, and then the water rejected from multi-effect HDD process is reused to desalinate in a basin-type unit further. The gain output ratio (GOR) of this system will rise by 2–3 at least through reusing the rejected water. The research proves that the multi-effect HDD has much room to be improved. A hybrid solar desalination process of the multi-effect humidification dehumidification and the basin-type unit should be noticed.

This study gives a hybrid solar desalination process of the multi-effect humidification dehumidification and the basin-type unit. The GOR of this system will rise by 2–3 at least through reusing the rejected water. Notation m h cp t d GOR Q Q r M N u S L H t Ratio h Mass flow rate, kg/s Specific enthalpy, kJ/kg Heat, kJ/kg K Temperature, °C Humidity ratio, g/kg (da) The gain output ratio Rate of heat transfer, kJ/s The amount of heat transfer, kJ Latent heat of water vapor, kJ/kg Mass, kg Number of stages of basin-type unit Specific inner energy, kJ/kg Solar radiation heat rate, kJ/s Loss flow rate, kJ/s Enthalpy, kJ Time Mass flows rate ratio of water to dry air Efficiency Subscripts added rec rej da w cw HDD Added by thermal source (solar collector or others) Recovered by heat exchanger Rejected by the unit Dry air Seawater Condensed water Multi-effect humidification dehumidification desalination basin loss useful in initial final collector single sum Basin-type desalination unit Loss from base and besides of basin Useful for distillation Flow in Initial state of basin Final state of basin Solar collector Single stage basin-type unit Sum of both desalination parts Water inlet to condenser Water outlet from condenser Water inlet to humidifier Water outlet from humidifier Air at bottom of unit Air at top of unit