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and without waste heat recovery is conducted. Moreover, a yearly assessment of the proposed HDH Mathematics 2021, 9, 33 system is also carried out to study the impact of waste energy recovery. In this regard, the data of the Taxila city (Pakistan) are used for solar irradiance over the complete year. A comparison of solar- assisted HDH desalination system with and without waste heat recovery is presented for the complete year; thereby indicating the impact of energy recovery. An economic analysis is also Figure 1. Checklist of various identified literature gaps which are addressed in this work contributing towards its novelty. FigurIen1t.hCihsewckolirskto,fuvsairnigouasimdeantthifeiemdalittiecraltumreogdaeplsawnhdicshimaruelaadtdiorenssefdorinatchtiusawlosroklcaornitrribaudtianngce, atoswseasrsdms ietsnntoovfelitmy.provements in the productivity of the proposed system is presented. The improvement in the HDH system is proposed in terms of recovering waste energy from the feed water at the exit of the dehumidification part of the system. Usually, water leaving the condenser has relatively higher enthalpy. The prime novelty of this work is to present a yearly thermoeconomic analysis of the solar-assisted humidification dehumidification desalination plant by recovering the energy from the wasted feed water enthalpy while considering the local conditions. Here, the proposed solar-assisted HDH desalination system utilizes the feed water at the exit of the condenser/dehumidification coil by reusing it in the brackish water storage tank. This allows the waste heat recovery (WHR) for the HDH desalination system and lessens the requirement of secondary energy sources. The governing mathematical model for the flat-plate solar collector, humidification chamber, and dehumidification chamber is solved through an iterative procedure [36]. The mass and energy balance on the brackish water storage is also solved including waste heat recovery from the condensing coil. A parametric study in which the influence of mass flow rate (MFR) of inlet air, saline water, feedwater, and temperature of the air on the freshwater productivity with and without waste heat recovery is conducted. Moreover, a yearly assessment of the proposed HDH system is also carried out to study the impact of waste energy recovery. In this regard, the data of the Taxila city (Pakistan) are used for solar irradiance over the complete year. A comparison of solar-assisted HDH desalination system with and without waste heat recovery is presented for the complete year; thereby indicating the impact of energy recovery. An economic analysis is also presented to reflect the advantages of waste heat recovery in terms of the cost of the desalinated water. presented to reflect the advantages of waste heat recovery in terms of the cost of the desalinated water. 5 of 31PDF Image | Humidification Dehumidification Solar Desalination System
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