Problems. Today desalination of seawaterprovides a worldwide fresh water productionof 24.5 million m 3 perday.One of the promising desalination methods is thermal humidification-dehumidification process. In spite of significant benefits this technology, it has a key drawback – high thermal energy consumption.The aim of the study. Determine the optimal thermodynamic parameters of working substances (air and water) in elements of desalination system with humidification–dehumidification cycleto obtain maximum performance with a minimum energy consumption.Methodology of implementation. Mathematical modeling of the humidification-dehumidification cycle at different input parameters.The thermodynamic model was createdusing equations of mass and energy balances of the desalination system.Research results. System Gain output ratio(GOR) increases with increasing salt watertemperature at the outlet of the dehumidifier.Maximum valuesof GORand recovery ratio (RR) are observed at the maximum temperature difference (maximum heating) of salt water in the dehumidifier. It is shown that values of GOR and RR increasewith increasing salt water temperature at the inlet to the humidifier. It is found that GOR value is independent of the temperature and humidity of the air at the inlet to the humidifier.Conclusions.The maximum valuesof GOR and RR for the humidification-dehumidification cycle with additional water heating are 3.75 and 6%, respectively. To obtain such results,the temperature of salt water at the inlet tothe system (dehumidifier) should be equal to 10 °C, and the temperature of salt water at the inlet to the humidifier – 70 °C. At the same time, temperature and humidity of the airсan have any values. The use of renewable energy for heating salt water in the heater will significantly increase system GOR

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The analysis of energy efficiency of heat pump-adsorption system of conservation of power equipment taking into account real processes of dehumidification and humidification of air in adsorption rotor in comparison with energy efficiency of standard system with electric heater of regenerative air is performed. The analysis shows that the heat pump-adsorption system is many times more energy-efficient under the condition of not only theoretical but also real (non-isoenthalpy) working processes in the adsorption rotor. It is also shown that there are optimal values of regeneration air temperature after the heat pump condenser at the inlet to the rotor, at which the energy efficiency of the heat pump-adsorption system reaches maximum values. It is established that the optimal values of regeneration air temperature change in a narrow range (at the level of 60...65 0С), and the maximum values of energy efficiency coefficient significantly decrease for a standard system with electric heater and increase for heat pump-adsorption system with decreasing ambient temperature.