What is the primary function of the evaporator coil in an air conditioning system?

What is the primary function of the evaporator coil in an air conditioning system?

• A. Condenses refrigerant to release heat to the outside
• B. Absorbs heat from the indoor air by evaporating refrigerant
• C. Compresses refrigerant to increase pressure
• D. Regulates refrigerant flow through the metering device

Answer: (B)

The evaporator coil’s job is to remove heat from the indoor air by absorbing it into the refrigerant as it boils inside the coil. When indoor air blows over the cold, low-pressure refrigerant inside the coil, heat is transferred to the refrigerant, causing it to change from a liquid to a low‑pressure gas. This heat absorption cools the air that comes back into the room. The resulting vapor then goes to the compressor to continue the refrigeration cycle. The other functions belong to different components: the condenser coil releases that absorbed heat outside, the compressor raises the refrigerant’s pressure, and the metering device controls how much refrigerant flows.

The evaporator coil’s job is to remove heat from the indoor air by absorbing it into the refrigerant as it boils inside the coil. When indoor air blows over the cold, low-pressure refrigerant inside the coil, heat is transferred to the refrigerant, causing it to change from a liquid to a low‑pressure gas. This heat absorption cools the air that comes back into the room. The resulting vapor then goes to the compressor to continue the refrigeration cycle. The other functions belong to different components: the condenser coil releases that absorbed heat outside, the compressor raises the refrigerant’s pressure, and the metering device controls how much refrigerant flows.