What occurs during the defrost cycle of refrigeration systems?

During the defrost cycle of refrigeration systems, one of the primary functions is to remove frost buildup on the evaporator coils. Frost accumulation occurs due to moisture freezing on the coils, which can impede airflow and reduce the system's efficiency. By entering the defrost cycle, the system typically warms the evaporator coils to melt any accumulated frost or ice. This process ensures optimal heat exchange, which is crucial for maintaining the refrigeration system's overall efficiency.

The defrost cycle involves temporarily halting the cooling cycle to facilitate this melting process. This action restores the evaporator's efficiency and improves the system's performance, preventing potential issues like reduced cooling capacity or increased energy consumption. Hence, the correct portrayal of the defrost cycle primarily focuses on the removal of frost to ensure the continued effectiveness of the refrigeration system.