In a typical vapor-compression air conditioning system, where does the refrigerant change from liquid to gas?

In a typical vapor-compression air conditioning system, where does the refrigerant change from liquid to gas?

• A. Filter
• B. Evaporator
• C. Condenser
• D. Compressor

Answer: (B)

The refrigerant changes from liquid to gas in the evaporator because that’s where it absorbs heat from the surroundings. After the expansion device lowers its pressure so the liquid is cold, it flows through the evaporator coils. As air from the space blows over the coils, heat is transferred into the refrigerant, causing the liquid to boil and become a low‑pressure vapor. The condenser would be where vapor turns back into liquid by releasing heat, and the compressor merely compresses the gas, so those aren’t the places of the liquid-to-gas change.

The refrigerant changes from liquid to gas in the evaporator because that’s where it absorbs heat from the surroundings. After the expansion device lowers its pressure so the liquid is cold, it flows through the evaporator coils. As air from the space blows over the coils, heat is transferred into the refrigerant, causing the liquid to boil and become a low‑pressure vapor. The condenser would be where vapor turns back into liquid by releasing heat, and the compressor merely compresses the gas, so those aren’t the places of the liquid-to-gas change.