Modeling and Conceptual Design of Solar Water Desalination System with Ground Condenser

, Ph.D. Dissertation Sharif University of Technology Asgari, Behrad (Author) ; Kazemzadeh Hannani, Siamak (Supervisor) ; Hakkaki Fard, Ali (Supervisor)

Abstract

Providing fresh water for domestic and agricultural purposes has become one of the most pressing issues of the present century. Due to the dependency of conventional desalination on fossil fuels, these methods are associated with carbon dioxide and other greenhouse gas emissions. Therefore, renewable energy-based desalination systems have come to the fore. This study scrutinizes the performance of the solar Humidification-Dehumidification (HDH) desalination systems with subsurface condensers. In this system, solar energy evaporates water, and subsurface condensers condense water vapor into fresh water. Therefore, this system uses two renewable solar and geothermal energy. Due to the lack of...

Experimental Investigation of an Evaporative Condenser-Based Combined Heat Pump and Humidification-Dehumidification Desalination System

, Ph.D. Dissertation Sharif University of Technology Faegh, Meysam (Author) ; Shafii, Mohammad Behshad (Supervisor)

Abstract

The present thesis aimed to study a novel heat pump integrated humidification-dehumidification (HDH-HP) desalination system. A theoretical outline was proposed for the first time to examine the design and off-design performance of HDH-HP cycles via the compressor characteristics method. In this regard, the variations in heat pump performance were modeled in different operating conditions for a fixed-size system. To fabricate a compact HDH-HP system, an evaporative condenser was designed and used instead of a separate humidifier, heater, and air/water-cooled condensers find in previous HDH-HP systems. Meanwhile, the air dehumidification process in this work directly occurred inside the heat...

Experimental Evaluation of a Multi-Stage Design Strategy in a Humidification-Dehumidification System for Desalination of Highly Saline Waters

, M.Sc. Thesis Sharif University of Technology Karimbeigi Darian, Reza (Author) ; Moosavi, Ali (Supervisor)

Abstract

In this research, an attempt has been made to construct an industrial-scale humidification-dehumidification water desalination system using the results of previous laboratory-scale studies and experiments by researchers. The constructed system consists of two separate sections, each containing two stages for humidification and dehumidification. It is noteworthy that only the bubble column method has been utilized in this system, with each stage containing ten layers to increase the moisture exchange between air and water. In this study, the effects of parameters such as the structure of the trays in each layer, the water height in each layer, air flow rate, and the temperature at various...