What happens to the refrigerant in the defrost cycle when it changes state back into a liquid?

When refrigerant transitions back into a liquid during the defrost cycle, it releases heat. This heat release occurs because the refrigerant, when changing from a gas to a liquid, goes through a process called condensation. This process is exothermic, meaning it releases heat into the surrounding area.

In the context of the evaporator, this released heat can help raise the temperature of the refrigerator or the area being conditioned, effectively assisting in melting any frost or ice accumulation on the coils. The defrost cycle is crucial for maintaining the efficiency of the refrigeration system, as excessive frost can hinder airflow and reduce the system's performance.

By releasing heat during this phase, the refrigerant ensures that the coils can clear ice buildup, thereby facilitating a more efficient cooling process once the system resumes normal operation.