In cold store facilities

such as cold rooms and fresh storage warehouses

air curtains are usually installed at the door to reduce the loss of cooling capacity caused by opening the door during operation. Traditional air curtains have disadvantages such as high wind speed attenuation and poor sealing performance. Therefore

in this study

three structurally independent design are developed

aiming to optimize the wind speed through the air curtain device as follows: an improved small static pressure box and the tapered nozzle is installed

guide vanes are installed in the static pressure box

and the return air system is installed. Additionally

an optimization of the air curtain airflow organization and the sealing effects of the cold storage are studied. The wind speed at various points of the air curtain's outlet section is measured to determine the decrease in the wind speed as it traveled 1.2 m from the outlet. The effectiveness of the air curtain in sealing a warehouse door is also evaluated by using a gas tracer method to examine cold air penetration under different configurations of the air curtain system. The results show that the installation of the static pressure box and tapered nozzle significantly increases the wind speed in the first half of the air supply

and the installation of the guide vanes has a greater impact on the wind speed in the second half of the wind speed storehouse door. The return-air system increases the wind speed in the second half. The sealing efficiencies of the single-layer air curtain

double-layer air curtain

and three-layer air curtain in the cold air penetration experiment are 0.16

0.19

and 0.22

respectively

and those of the single-layer circulating air curtain

double-layer circulating air curtain

and three-layer circulating air curtain are 0.29

0.38

and 0.43

respectively.