What type of fan is typically used to push air through coils in ammonia refrigeration systems?

In ammonia refrigeration systems, the use of forced fans is critical for effectively promoting airflow through the coils. Forced fans are designed to move a substantial volume of air at a consistent velocity while overcoming resistance created by ductwork and coil structures. This capability is essential in ammonia refrigeration applications, where efficient heat exchange plays a crucial role in maintaining optimal cooling performance.

By utilizing forced fans, these systems ensure that the air is not only pushed through the evaporator coils—where heat is absorbed—but is also uniformly distributed to maximize contact with the coil surface. This results in enhanced heat transfer efficiency and overall system performance. The effectiveness of forced fans helps maintain the required temperature levels within the refrigeration system, contributing to its reliable operation.

The characteristics of other fan types do not align with the specific requirements of ammonia refrigeration systems. For instance, exhaust fans are primarily designed to remove air from a space, while convection fans rely on natural airflow and are not specifically optimized for pushing air through coils under pressure. Thus, the use of forced fans is the best choice for achieving effective air movement and heat exchange in ammonia refrigeration systems.