Icemaking system and a method of controlling evaporation temperature referred to by the icemaking system

An icemaking system comprising:

• a refrigerant circuit that executes a vapor compression refrigeration cycle;
• a circulation circuit that circulates solution as a cooling target of the refrigerant circuit;
• and
• a control device that controls refrigerant evaporation temperature at the refrigerant circuit, wherein
• the circulation circuit comprises a solution flow path of:
• an ice generator;
• a solution tank that stores the solution;
• and
• a pump that pressure feeds the solution to the solution flow path,
• the refrigerant circuit comprises:
• an evaporator of the ice generator;
• a compressor;
• a condenser;
• and
• an expansion valve, and
• the control device comprises a central processing unit that:
• calculates target evaporation temperature based on a correlation between solute concentration of the solution and the refrigerant evaporation temperature, wherein the correlation is defined such that a temperature difference between freezing temperature of the solution and evaporation temperature at the evaporator increases as the solute concentration increases, and
• adjusts the evaporation temperature at the evaporator to decrease as the solute concentration of the solution increases and to reach the target evaporation temperature thus calculated.