Introduction to the Working Principle of FNH Air-Cooled Condensers

Introduction to the Working Principle of FNH Air-Cooled Condensers

The working principle of FNH air-cooled condensers is based on heat exchange mechanisms. External airflow guided by fans exchanges heat with the internal refrigerant, condensing the high-temperature, high-pressure gaseous refrigerant into a liquid state. The specific process is as follows:

Refrigerant Inflow: High-temperature, high-pressure gaseous refrigerant exiting the compressor enters the pipes of the FNH air-cooled condenser. At this stage, the refrigerant carries significant heat generated during compression within the compressor, maintaining a high-temperature, high-pressure state.

Heat Transfer: The pipes of the FNH air-cooled condenser are typically constructed from highly thermally conductive metals like copper. The fins are generally made of aluminum and designed with shapes that maximize air contact area, such as plate-like or finned configurations. The heat from the refrigerant is transferred through the pipe walls to the fins outside the pipes.

Air Cooling: The FNH air-cooled condenser employs a side-blowing airflow configuration. Air is continuously blown over the fins by a fan. As the air flows through the fins, it absorbs heat from them, lowering their temperature and thereby cooling the refrigerant. The air, having absorbed heat, increases in temperature and is then discharged into the surrounding environment.

Refrigerant Condensation: As heat is continuously removed by the air, the refrigerant's temperature gradually decreases. When the temperature drops to the refrigerant's condensation point, the gaseous refrigerant begins to condense into a liquid state. During this process, the refrigerant releases a significant amount of latent heat, which is further removed by the fins and the air.

Liquid refrigerant discharge: The condensed liquid refrigerant flows out of the FNH air-cooled condenser outlet due to gravity or system pressure, proceeding toward a throttling device such as an expansion valve. After passing through the throttling device, the refrigerant pressure decreases, transforming into low-pressure, low-temperature liquid refrigerant. It then enters the evaporator, where it absorbs heat from the cooled object, completing the refrigeration cycle.