Abstract
In the present study, the ice slurry refrigeration system with pre-cooling heat exchanger (ISSH) is studied experimentally to achieve the system performance, ice crystal formation time and the temperature of ice crystal formation. The operating parameters considered in this paper include the concentration of salt solution, suction pressure, discharge pressure and Energy Efficiency Ratio (EER). The result shows that the temperature of critical time of ice crystal formation decreases with the increasing concentration of salt solution and that the ice crystal formation time increases with the increasing concentration of salt solution. In the same concentration of salt solution, the ice crystal formation temperature of ISSH is lower than that of basic ice slurry refrigeration system (BISS), and the ice crystal formation time of ISSH is shorter than that of BISS. On the whole, the EER of ice slurry refrigeration system with pre-cooling heat exchanger is higher than that of basic ice slurry refrigeration system.
Highlights
In the history of fishery, ice as a cooling medium has been used for more than 100 years
The temperature change process can be divided into four stages: cooling section (AB), cold section (BC), ice crystal formation segment (CE) and stable segment (EF), and Tph is defined as the freezing point of salt solution
It is clearly that ice crystal formation process is promoted by the subcooling degree and the concentration of salt solution has a great effect on the subcooling degree
Summary
In the history of fishery, ice as a cooling medium has been used for more than 100 years. In the conventional ice slurry making system using the scraped surface type [11] [12], a circular shell-and-tube type heat exchanger is included, where the outer shell side is cooled by an evaporating refrigerant, and the inner side is scraped by spring loaded rotating blades to prevent any crystals from depositing on the cooled surface. Some problems still exist in this system, for example the scrape part is damaged, and the system is complex and has a huge volume which is difficult to carry This makes the fish cannot be cooled in time. ISSH is designed to experiment from system performance, ice crystal formation time and the temperature of ice crystal formation time. It aimed to provide some basis for the miniaturization of ice slurry refrigeration system
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