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Meefog guide CompAarative Guide to Inlet Air Cooling Technologies Under High Temperature Humidity Conditions An Overview MEE INDUSTRIES INC CDuring hot weather combustion turbine CT operators are posed a signi ?cant problem by the degradation of turbine g

CompAarative Guide to Inlet Air Cooling Technologies Under High Temperature Humidity Conditions An Overview MEE INDUSTRIES INC CDuring hot weather combustion turbine CT operators are posed a signi ?cant problem by the degradation of turbine generation capacity The typical CT on a hot summer day for instance produces up to less power than on a cold winter day As a result a number of cooling techniques have evolved over the years to maximize turbine output Correction Factor TURBINE PERFORMANCE CHART Compressor Inlet Temperature - ? F The basic theory of inlet air cooling for gas turbines is simple enough Combustion turbines are constant volume machines ?? at a given shaft speed they always move the same volume of air ?? but the power output of a turbine depends on the ow of mass through it That ? s why on hot days when air is less dense power output falls o ? By feeding cooler air into the CT mass ow is increased resulting in higher output Another factor is the power consumed by the CT ? s compressor The work required to compress air is directly proportional to the temperature of the air so reducing the inlet air temperature reduces the work of compression and there is more work available at the turbine output shaft There is however a limitation on the amount of inlet air cooling that can safely be accomplished If the temperature is allowed to go too low ice can form on the bell-mouth or inlet guide vanes with the risk of this ice aking o ? and doing mechanical damage to the compressor blades This phenomenon can occur even when the inlet air temperature is above freezing because suction at the turbine inlet creates a low pressure ? cool zone ? at the bell-mouth To avoid this problem most turbine manufacturers recommend that inlet air be kept at or above ?F Traditionally either mechanical chillers or media-type evaporative coolers have been used to cool combustion turbine inlet air INLET AIR CHILLERS Various refrigerant-type air chilling systems have been successfully employed for combustion turbine inlet air cooling These range from compressor-type chillers to absorption chillers which utilize ??waste ? heat as an energy source for the chilling process Thermal storage systems have also been successfully applied to CTs These use relatively small chiller plants running o ?-peak to make ice or coldbrine solutions which are stored in an insulated tank and used to cool the inlet air during peak-power demand Such systems have proven to be a coste ?ective way to overcome power loss during peak-demand periods while reducing the high costs normally associated with chiller plants Gas turbines typically operate at as little as of their rated capacity on hot days due to the lower air density and higher temperatures Inlet air cooling helps to make up the di ?erence by increasing the air mass ow through the turbine and by cooling the air which reduces the work of compression Inlet Air Chillers The most