Because the total gross of cold stores is increasing

the energy consumption of cold stores is attracting increasing attention. Infiltration through the doorway

which accounts for a large part of the total heat load

has become an important research focus with regard to the energy consumption of the cold store. In this paper

by using an unsteady RANS model

a transient infiltration simulation model is established. By utilizing a cold store with height ratio between the cold store and the door 2:1

experimentally measured data under conditions with different temperature differences and operation modes of the cooling fans are used to validate the model. The results show that the predicted value and change trends of the infiltration air volume

local wind speed

and temperature of the established model agree well with the experimental data. The predicted error for the infiltration air volume before 40 s of door-open time is ±10%. By using this model

the characteristics and mechanism of the infiltration are analyzed. The results show that

owing to the effect of the airflow made by cooling fans

the temperature in the cold store when the fans are on is lower than that when the fans are off. There is little density difference between the warm air and the cold air. The gravity imposed on the cold air has little variation. Thus

the infiltration air volume changes linearly with the door-open time.