Patent ID: 7089760

Claim:
An air-conditioner comprising: a compressor configured to compress a refrigerant; a condenser configured to condense the compressed refrigerant with air outside of a vehicle compartment; a throttle configured to expand the condensed refrigerant; an evaporator configured to evaporate the expanded refrigerant to cool air inside of the vehicle compartment and to eliminate moisture from the air, a first refrigerant passage having the condensed refrigerant between the condenser and the throttle; a second refrigerant passage having the evaporated refrigerant between the evaporator and the compressor; and a refrigerant pipe located between the first and second refrigerant passages and configured to exchange heat between the condensed refrigerant and the evaporated refrigerant, the refrigerant pipe comprising: a first refrigerant pipe in fluid communication with the first refrigerant passage; a second refrigerant pipe in fluid communication with the second refrigerant passage; and a coupling connecting the first refrigerant pipe to the first refrigerant passage and connecting the second refrigerant pipe to the second refrigerant passage, wherein the first refrigerant pipe has an inlet and an outlet longitudinally opposite to each other and the outlet is positioned lower than the inlet.