1991 Volume 8 Issue 3 Pages 213-220
The purpose of this paper is to obtain the basic data for the design of the pressure cooling system. The effects of stacking arrangements,the porosity of container and the ratio of channel width on the resistance to airflow were measured. Summary of the result is as follows : 1) The resistance to airflow of containers in rectangular stack is showed in the expression,ΔP= KQm εn, where ΔP is pressure drop,K is constant,Q is airflow rate and ε is porosity of container. The ranges of values of m and n are 1.96 ~ 2.00 and -1.98 ~ -2.13,respectively. 2) The pressure drop of four containers at the airflow rate 10m3/ min is 98.1Pa (10mmAq) when ε = 34.7% and 4.02kPa (410mmAq) when ε = 5.4%. 3) The resistance to airflow of U-shaped stack is constant at supply channel width ≥ 150mm and exit channel width ≥ 300mm.When the ratio of channel width is about 1.0,the pressure drop is the minimum. 4) As for U-shaped stack,the ranges of values for m and n are 1.93~ 2.00 and -1.75~-2.00,respectively. The pressure drop is 2.9Pa (0.3mmAq) when ε =34.7% and 123.6Pa (12.6mmAq) when ε = 5.4%at the volume ratio 50% and airflow rate l0m3/min. 5) On the consideration of the energy for airflow,the U-shaped stack is of great advantage compared with the rectangular stack.
