Supercooling system cooling performance evaluation method and optimization method

The invention discloses a supercooling system cooling performance evaluation method and optimization method, the supercooling system is a liquid oxygen supercooling system, and the evaluation method comprises the influence of entropy production unit number and efficiency on the supercooling system; the entropy generation unit number is used for representing irreversible loss generated in the heat exchange process of the supercooling system; the efficiency is used for representing the ratio of income to payment in actual work of the supercooling system, the income is liquid nitrogen increase in a shell pass, and the payment is liquid oxygen reduction in a tube pass; the calculation formula of the entropy production unit number is shown in the specification; an efficiency calculation formula is shown in the specification; in the formula, the entropy production unit number, the entropy production number, the specific constant pressure heat capacity of the hot fluid, the mass flow rate of the hot fluid, the effic