Condenser is located in the front of an engine compartment of an automobile to convert high-temperature and high-pressure refrigerant of an air conditioner, which is fed from a compressor, to liquid form by cooling it. The condenser is provided separately or is assembled with a radiator in the form of a cooling module. The condenser includes tubes, fins, and header pipes connecting the tubes, like a radiator. A receiver dryer integrated sub-cooling type, which is widely used at present, causes the refrigerant to flow through a sub-cooling zone inside the condenser before it flows to the exit, so that the refrigerant flows to an expansion valve in the supercooled state.