Performance

 

Inputs for the configuration of the wet cooling tower are entered on the Performance parameter screen. It is the same for all plant types. The following parameters are available:

•Ambient Air Temp (Dry Bulb Average): (Not shown for hybrid cooling systems .) This refers basically to the ambient air temperature measured by a thermometer. This input specifies annual average ambient temperature.

•Air Wet Bulb Temperature (Average): (Not shown for hybrid cooling systems .) This refers to the temperature of air that is cooled adiabatically to saturation at a constant pressure by evaporation of water into it. It is calculated in terms of ambient dry bulb temperature and humidity. This is the lowest temperature that can be reached by evaporating water into the air.

•Cooling Water Inlet Temperature: This is the temperature of the cooling water entering the wet tower.

•Cooling Water Temperature Drop: This parameter specifies the temperature drop range of cooling water across the wet tower.

•Cycles of Concentration: This is a measure of the degree to which dissolved solids are being concentrated in the circulating water and is estimated in terms of concentration ratio of dissolved solids in the circulating versus makeup water. It is reversely related to the blowdown. Improving the quality of makeup water for the cooling system can increase the cycle of concentration and decrease the amount of tower blowdown.

•Tower Drift Loss: This parameter specifies a percent of the quantity of cooling water as drift loss.

•Auxiliary Cooling Load: This parameter specifies additional heat load on the auxiliary equipment and is expressed as a percentage of the load on the primary steam cycle. The default value comes from the IECM's predecessor, the PISCES model.

•Tower Overdesign Factor: This parameter overdesigns the wet tower size.

•Slip Stream Treatment System: These parameters are only shown when the Slip Stream Treatment System is selected on the Config screen.

•Slip Stream Inlet: This parameter specifies the underflow as a percent of the quantity of cooling water.

•Slip Stream Underflow: This parameter specifies the underflow as a percent of the quantity of slip stream.

•Cooling Makeup Treatment System: These parameters are only shown when the Makeup Water Treatment System is selected on the Config screen.

•Cooling Makeup Underflow: This parameter specifies the underflow as a percent of the quantity of entering water treated.

•Alum Dosage (Coagulant): (Not shown for hybrid cooling systems .) This is the alum dosage for makeup water treatment.

•Power Requirement: This is the power needed to run the pumps and other equipment for the water cooling system. It is also referred to as an energy penalty. In PC power plants, it is expressed as a percentage of the gross plant capacity. In IGCC plants, it is calculated based on the steam turbine power output and expressed as a scaled percentage of the total gross power outputs including the gas and steam turbines.

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