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.

Copyright American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. 1999 under license agreement with Books24x7

Products & Services
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.
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.
Evaporative Coolers
Evaporative coolers are cooling devices that use the evaporation of water into the air to cool the air temperature. They are sometimes called air coolers, desert coolers or swamp coolers.
Laboratory Condensers
Laboratory condensers are large, coolant-filled tubes that surround smaller glass tubes that contain a hot fluid or vapor. They are used to cool fluids and condense gases.

Topics of Interest

Evaporative Cooling An ideal evaporative cooling process occurs at a constant wet-bulb temperature, cooling the air to 100% relative humidity. The inlet warm air is partly in contact with the liquid...

2.3 Air Cooling System Equipment The air entering a combustion turbine can be cooled by different methods and by a wide range of equipment types. Historically, air cooling has been accomplished by...

2.6 Heat Rejection Considerations For any of the vapor compression refrigerating equipment configurations, heat must be rejected from the condenser component of the refrigerating system. Cooling is...

Secondary Fluid Cooling A secondary fluid cooling (SFC) process is also shown in Figure 10, where the air-water vapor mixture is being cooled from the same initial condition, condition 1. The SFC...

6.1 WHERE THE REFRIGERATION LOAD ENTERS THE SYSTEM The evaporator is the component of the refrigeration system where a fluid stream or a product is cooled. As Fig. 6.1 shows, the evaporator is the...