Scroll compressors are cooled by

Scroll compressors are cooled by

• A. Ambient air
• B. Liquid refrigerant
• C. Oil
• D. Suction vapor

Answer: (D)

Scroll compressors are cooled by the suction vapor. When low‑pressure refrigerant enters from the evaporator as a vapor, it absorbs heat from the compressor components and motor windings as it moves through the compressor, carrying that heat away as discharge gas. Oil mainly provides lubrication and helps with sealing, but the vapor that enters on the suction side is the primary cooling medium. Ambient air isn’t circulated inside the sealed compressor, and while liquid refrigerant or oil have roles in lubrication and system operation, they are not the primary means of cooling the compressor itself.

Scroll compressors are cooled by the suction vapor. When low‑pressure refrigerant enters from the evaporator as a vapor, it absorbs heat from the compressor components and motor windings as it moves through the compressor, carrying that heat away as discharge gas. Oil mainly provides lubrication and helps with sealing, but the vapor that enters on the suction side is the primary cooling medium. Ambient air isn’t circulated inside the sealed compressor, and while liquid refrigerant or oil have roles in lubrication and system operation, they are not the primary means of cooling the compressor itself.