SHOWCASE AND AIR CURRENT CIRCULATION THEREOF

PURPOSE:To permit simultaneous cooling from the front surface and the back surface of a case by a method wherein the showcase is equipped with a back duct, introducing cold air from a lower duct into an upper duct, a flow regulating member, equipped with a multitude of air outlet holes, and a resistance member, positioned before the flow regulating member. CONSTITUTION:Cold air is distributed from a lower duct 11 by a ventilating fan 21 and flows upward through respective back ducts 12, then, is joined in an upper duct 8. The pressure of the cold air is increased by a resistance member 25 in the back duct 8 and one part of the same is blown downward from the multitude of air outlet holes 24, then, the cold air flows forward along the surface of the back ducts 12 across an opening 13. On the other hand, most of the cold air is blown downward through an air outlet port 7 and forms a back surface air curtain BC across another opening 2 as a front surface air curtain FC, then, is returned into a lower duct 11 from a suction port 10 after joining cold air passed through respective racks 14 and, thereafter, heat exchange is effected in a cooler 20 and above-described circulation is repeated.