Air conditioner energy-saving refrigeration control method and system based on variable freezing water temperature model

The invention discloses an air conditioner energy-saving refrigeration control method and system based on a variable freezing water temperature model, and relates to the field of air conditioner refrigeration. Obtaining a test enthalpy value; calculating the total cooling capacity by using a total cooling capacity formula; the air inlet enthalpy value and the test enthalpy value are substituted into a full cooling capacity formula, and A is obtained; calculating a current outdoor air enthalpy value I; the actual total cooling capacity is calculated through a total cooling capacity formula, and the actual total cooling capacity is A (I-It); calculating to obtain an indoor enthalpy value; the actual refrigerating capacity is obtained; if the actual total cooling capacity is equal to the actual refrigerating capacity, algebraic transformation is carried out to obtain It = a-b * I; obtaining the set temperature of the chilled water with the enthalpy value of It; and adjusting the temperature of the chilled water.