Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 53 Issue 5 (Special Issue) 2021 07 23 Performance investigation of freezing desalination coupled with carbon dioxide refrigeration system Performance investigation of freezing desalination coupled with carbon dioxide refrigeration system 3351 3366 4173 10.22060/mej.2020.18120.6746 FA Maryam Salajeghe Department of Energy, Institute of science and high technology and Environmental Science, Graduate University of Advanced Technology, Kerman, Iran Mehran Ameri Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran Journal Article 2020 03 19 The world is currently facing the prospect of a severe global shortage of fresh water. Desalination of seawater can provide an almost inexhaustible source of freshwater if it can be made affordable. Freezing is a well-known technique for water desalination. The carbon dioxide refrigeration system is used for cooling required in the freezing desalination system and the evaporator and condenser of the refrigeration system are respectively crystallized and melted in the freezing desalination system. In this paper, the basic principles of freeze concentration processes are presented and a model of a freezing desalination coupled with CO₂ refrigeration has been developed based on the theories of heat and mass transfer. To examine the performance of the system, a parametric study is performed to investigate the effect of different parameters such as freezing desalination feed temperature, feed concentration, distillate temperature, distillate concentration and freezing desalination recovery ratio on coefficient performance and energy consumption have been explored. It can be concluded that increasing the feed concentration and feed temperature is accompanied with the reduction of coefficient performance and a raise in specific energy consumption. Increasing the ice fraction also increases the specific energy consumptionsystem. Freezing desalination system in the present study is comparable in energy consumption to reverse osmosis desalination system. The world is currently facing the prospect of a severe global shortage of fresh water. Desalination of seawater can provide an almost inexhaustible source of freshwater if it can be made affordable. Freezing is a well-known technique for water desalination. The carbon dioxide refrigeration system is used for cooling required in the freezing desalination system and the evaporator and condenser of the refrigeration system are respectively crystallized and melted in the freezing desalination system. In this paper, the basic principles of freeze concentration processes are presented and a model of a freezing desalination coupled with CO₂ refrigeration has been developed based on the theories of heat and mass transfer. To examine the performance of the system, a parametric study is performed to investigate the effect of different parameters such as freezing desalination feed temperature, feed concentration, distillate temperature, distillate concentration and freezing desalination recovery ratio on coefficient performance and energy consumption have been explored. It can be concluded that increasing the feed concentration and feed temperature is accompanied with the reduction of coefficient performance and a raise in specific energy consumption. Increasing the ice fraction also increases the specific energy consumptionsystem. Freezing desalination system in the present study is comparable in energy consumption to reverse osmosis desalination system. https://mej.aut.ac.ir/article_4173_1f6e8e82a9e7fbc2bdb39a59a193784d.pdf