Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 56 10 2024 12 21 Modeling and Thermodynamic Analysis of Vacuum Crystallizer with Heat Pump Modeling and Thermodynamic Analysis of Vacuum Crystallizer with Heat Pump 1377 1398 5687 10.22060/mej.2025.23430.7770 FA Amir Mehrdar Department of Mechanical Engineering, Shahrood Univ of Tech, Shahrood, Iran Mohsen Nazari Department of Mechanical Engineering, Shahrood Univ of Tech, Shahrood, Iran Mostafa Nazari Department of Mechanical Engineering, Shahrood Univ of Tech, Shahrood, Iran Maryam Ramezani Bazan Department of Mechanical Engineering, Shahrood Univ of Tech, Shahrood, Iran Journal Article 2024 08 29 <span style="letter-spacing: .05pt;">In this article, a forced circulation crystallizer under a vacuum, which consists of crystallizer, pump, and heat exchanger, is proposed for the purpose of providing fresh water for consumption. To simultaneously supply the heating load of the crystallizer and also to distill the water vapor coming out of the crystallizer, a heat pump has been used as a new method. A laboratory set is designed and built to demonstrate the feasibility of the proposed system, which includes a forced circulation crystallizer cycle. The average error percentage between the laboratory and simulation results was reported as 4.8%. The results indicate that by changing the inlet temperature and pressure of the crystallizer, the rate of salt crystal production and freshwater production increases by 0.65 and 19.81 kg/h, respectively. Electric energy consumption also decreases with the increase of feed water inlet temperature and the heat capacity of the heat exchanger, and the lowest amount of electric energy consumption occurs at the temperature of 50 degrees Celsius, the pressure of the crystallizer is 0.085 bar, and the heat capacity of the heat exchanger is 13.25 kw.</span> <span style="letter-spacing: .05pt;">In this article, a forced circulation crystallizer under a vacuum, which consists of crystallizer, pump, and heat exchanger, is proposed for the purpose of providing fresh water for consumption. To simultaneously supply the heating load of the crystallizer and also to distill the water vapor coming out of the crystallizer, a heat pump has been used as a new method. A laboratory set is designed and built to demonstrate the feasibility of the proposed system, which includes a forced circulation crystallizer cycle. The average error percentage between the laboratory and simulation results was reported as 4.8%. The results indicate that by changing the inlet temperature and pressure of the crystallizer, the rate of salt crystal production and freshwater production increases by 0.65 and 19.81 kg/h, respectively. Electric energy consumption also decreases with the increase of feed water inlet temperature and the heat capacity of the heat exchanger, and the lowest amount of electric energy consumption occurs at the temperature of 50 degrees Celsius, the pressure of the crystallizer is 0.085 bar, and the heat capacity of the heat exchanger is 13.25 kw.</span> https://mej.aut.ac.ir/article_5687_293a2870a8310985e2fd6890882f74fb.pdf