What type of compressor is mentioned as utilizing water for cooling?

Water-cooled compressors are designed specifically to use water as a cooling medium to dissipate heat generated during the compression process. This type of cooling system is effective in maintaining optimal operating temperatures, which can enhance the efficiency and longevity of the compressor. In water-cooled systems, water is circulated through a heat exchanger, absorbing heat from the compressor and subsequently carrying it away to a cooling tower or other heat dissipation system.

This method allows for better heat transfer compared to air cooling, especially in larger systems where the heat load is significant. Water-cooled compressors are often preferred in industrial applications where a stable and efficient cooling solution is essential for continuous operation.

The other options do not utilize water as a cooling medium in the same way. Air-cooled systems rely on ambient air for cooling, while evaporative-cooled and refrigerant-cooled systems use different principles of heat transfer that do not involve direct water cooling of the compressor unit itself.