In a mechanical refrigeration circuit, what is the purpose of the evaporator?

In a mechanical refrigeration circuit, what is the purpose of the evaporator?

• A. Transfer Heat From The Refrigerant To The Indoor Air
• B. Transfer Heat From The Indoor Air To The Refrigerant
• C. Transfer Heat From Outdoor Air To The Refrigerant
• D. Transfer Heat From The Refrigerant To The Outdoor Environment

Answer: (B)

The evaporator’s job is to remove heat from the space being cooled by transferring it to the refrigerant as the refrigerant evaporates. In cooling mode, the refrigerant enters the evaporator as a low-pressure, cold liquid. The indoor air passes over the evaporator coils, and because the air is warmer than the refrigerant, heat flows into the refrigerant. This heat absorption causes the refrigerant to vaporize, turning into a low-pressure gas. The cooled air is sent back into the space, while the refrigerant gas moves on to the compressor to continue the cycle. If heat were transferred from the refrigerant to the indoor air, the space would warm instead of cool, which isn’t how the evaporator operates. Heat is rejected to the outdoor environment later in the condenser, not in the evaporator.

The evaporator’s job is to remove heat from the space being cooled by transferring it to the refrigerant as the refrigerant evaporates. In cooling mode, the refrigerant enters the evaporator as a low-pressure, cold liquid. The indoor air passes over the evaporator coils, and because the air is warmer than the refrigerant, heat flows into the refrigerant. This heat absorption causes the refrigerant to vaporize, turning into a low-pressure gas. The cooled air is sent back into the space, while the refrigerant gas moves on to the compressor to continue the cycle. If heat were transferred from the refrigerant to the indoor air, the space would warm instead of cool, which isn’t how the evaporator operates. Heat is rejected to the outdoor environment later in the condenser, not in the evaporator.