Study on Affecting Factors of Rapid Oxygen Reduction Process in C.A. Storage

Abstract:

Inorder to get the concentration of O2 and CO2 into the specified values as soon as possible，to improve the storage quality，this paper studied on the affecting factors of rapid oxygen reduction process in the CA room. This paper takes a CA room for apples in Xian as research object，by means of K-ε model establishing the three dimensional physical and mathematical models for gas flow，heat and mass transfer inside the CA storage. This paper solves the problems of the apples' changing respiration rate and the changing mass fractions of the velocity-inlet boundary by writing a UDF program. By numerical calculation we obtain the curves of O2 concentration varied with time in the CA storage，at the same time comparing the simulated results to the experimental data of the relative reference. The results show that the different nitrogen purity corresponds to the fastest oxygen-consumed interval. When the volume fraction of nitrogen is 96%，the time of rapid oxygen reduction process is the least. The respiration rate of fruits vary greatly which can significantly affect the time of the rapid oxygen reduction process.