In what scenario is hot gas defrost typically used?

Hot gas defrost is especially used in scenarios where freezing conditions are prevalent. In refrigeration systems, especially those involving evaporators, the formation of ice on the evaporator coils can significantly hinder the system's efficiency and cause potential operational issues. This ice build-up typically occurs in colder environments, where the moisture in the air can condense and freeze on the coils.

When hot gas is circulated through the evaporator coils, it raises the temperature enough to melt any ice that has formed, thereby restoring proper airflow and efficiency within the system. This method effectively addresses the challenges posed by freezing conditions, as it allows the system to maintain performance without needing to shut down completely for a lengthy defrost cycle.