Theoretical study of a hybrid Humidification-Dehumidification desalination / Cooling system

This paper presents a theoretical investigation of a Humidification–Dehumidification Desalination (HDH) system, which is enhanced through hybridisation with technologies derived from refrigeration (Vapour Compression Refrigeration Cycle, VCR) and air conditioning (Indirect Evaporative Cooling, IEC) sectors. The IEC device serves as an efficient air humidifier. The hot and cold coils of the VCR cycle are used to improve the performance of the standard HDH system. Additionally, the proposed technology has the capability to deliver cooled air using the primary air from the IEC device. The scheme is presented and theoretically modelled, integrating data from commercial devices. The cycle is simulated under significant inlet and annual environmental conditions across diverse climatic zones. In certain reference climates, the cycle achieves a yearly SEC (energy consumption) of 220 kWh/m3 and a RWA (water recovery) of 4.42∙10-6. Furthermore, the proposed scheme can deliver cooled air ranging between 20-25 °C under hot operational conditions. These findings suggest that the system represents a competitive alternative within the HDH sector, with the added capability of supplying air cooling power when needed.