Patent ID: 7343756
Filing Date: 2008-03-18
Classification: F25B

Abstract:
1. An air conditioning system, comprising: an indoor unit in which a first refrigerant flows; a first tank connected to an outlet side refrigerant line of the indoor unit for sucking a first refrigerant; a second tank disposed to be lower than the suction tank and connected to an inlet side refrigerant line of the indoor unit for supplying the first refrigerant stored in the first tank to the indoor unit; a middle tank installed between the first tank and the second tank for connecting the first tank to the second tank; a heat source cycle for depressurizing and cooling the first refrigerant inside the first tank by circulating a second refrigerant, and heating the first refrigerant of the second tank; a middle tank cooling unit for feed back connected to an inlet side refrigerant line of the second tank among refrigerant lines of the heat source cycle for cooling the middle tank and maintaining a pressure inside the middle tank to be lower than a pressure inside the first tank; a middle tank heating unit for feed back connected to a refrigerant line between the first tank and the second tank among refrigerant lines of the heat source cycle for heating the middle tank and maintaining a pressure inside the middle tank to be higher than a pressure inside the second tank; and a controller for selectively circulating the second refrigerant of the heat source cycle to the middle tank cooling unit for feed back or the middle tank heating unit for feed back.