Abstract: Aiming at how to determine the temperature of the outer wall of the cryogenic storage tanks when calculating the cold leakage of the tanks, the formulas for calculating the average temperature and the maximum temperature of the outer wall of the storage tanks are deduced by using the outdoor temperature change rules and the heat transfer principles of solar radiation through analyzing the ambient temperature and solar radiation which are two main factors affecting the outer wall temperature of cryogenic storage tanks. The method for calculating the average temperature and the maximum temperature of the outer wall of the tank roof, the average temperature and the maximum temperature of the outer wall of the tank wall is demonstrated in the form of an example by using the derived formulas and relevant standards. The main influencing factors of the outer wall temperature of cryogenic storage tanks are identified and the method for reducing the outer wall temperature is proposed by analyzing the formulas and calculation examples. The application suggestions for the outer wall temperature of cryogenic storage tanks in the calculation of insulation and evaporation rate are put forward, and the application of the calculation method is expanded.

Key words: cryogenic storage tanks, radiation, outer wall temperature, quantitative calculation