From Design Guide: Combustion Turbine Inlet Air Cooling Systems

2.2 Psychrometry of Inlet Air Cooling

The two most prevalent types of inlet air cooling are direct contact evaporative cooling and indirect cooling using refrigerant or fluids with cooling coils. The evaporative cooling process entails the direct contact of the inlet air with water, using a wetted media, water sprays (mists), or water overspray. The water is either contained in an absorptive media or is sprayed into the airstream, though the wetted media is the most prevalent type of evaporative cooling system.

Refrigerant and secondary fluid types of cooling use a heat exchanger such as finned cooling coils to separate the air from the cooling fluid. The cooling fluid can be a refrigerant, chilled water (or well water), or a chilled brine (secondary coolant) solution. For a finned coil, the coolant is circulated inside the coil tubes (see ASHRAE 1996 for a discussion of coil designs) and the inlet air is directed over the outside surface, the finned tubes.

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HVAC Chillers
Heating, ventilation and air conditioning (HVAC) chillers are refrigeration systems that provide cooling for industrial and commercial applications. They use water, oils or other fluids as refrigerants.
Cooling Towers
Cooling towers are defined as any open water recirculation device that uses fans or natural draft to draw or force air to contact and cool water by evaporation.
Chillers (industrial)
Industrial chillers cool water using refrigeration cycles to provide a constant stream of coolant for manufacturing and laboratory processes.
Refrigerants, Antifreezes, and Cooling Liquids
Primary refrigerants use a thermodynamic or adiabatic process (evaporation-condensation cycles) to remove heat and cool a region. Secondary refrigerants such as antifreeze liquids provide cooling solely through heat transfer.
Heat Exchangers
Heat exchangers are commonly used in a wide variety of industrial, chemical, and electronics processes to transfer energy and provide required heating or cooling.

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