Abstract: A temperature setting part sets a reference temperature of the interior of a refrigerating compartment of a refrigerator. A door opening/closing detection part detects opening and closing of a door of the refrigerating compartment. First and second temperature detecting parts detect the interior and exterior temperatures of the refrigerating compartment respectively. An air curtain fan driving part drives an air curtain fan. A control part performs a normal cooling operation to control the interior temperature of the refrigerating compartment by driving the cooling fan when the interior temperature is under a reference temperature, drives the air curtain fan with each of the numbers of rotations corresponding to each of several temperature ranges, and performs the normal cooling operation by stopping the driving of the air curtain fan if the closing of the door of the refrigerating compartment is detected.

Abstract: A refrigerator having dual air velocity generating apparatus for air curtain flow comprises a cool air supply duct through which cool air is supplied to an upper opening of a food storage chamber by operation of a fan, and a dual air velocity generating apparatus provided at an exit of the cool air supply duct for transforming the air curtain flow discharged through the exit with the dual air velocity, thereby decreasing the velocity of the air curtain flow distal to the food storage chamber than that proximal to the food storage chamber.

Abstract: A cool air circulation apparatus in a refrigerator provides an upper curved lip extended from a front face of a lower shelf in a refrigerating chamber, by which cool air contacting with ambient air is discharged outside of the refrigerator and only the cool air adjacent to the refrigerating chamber flows into the refrigerating chamber. Accordingly, even though a door of the refrigerating chamber is open for a long time or is opened and closed frequently, ambient air does not enter into the refrigerating chamber and thus cooling efficiency of the refrigerator increases. As a result, a constant temperature in the refrigerating chamber is maintained at all times, thereby being capable of maintaining freshness of a stored foods for a long time.