Abstract
Energy and exergy analysis of reverse Brayton refrigerator for Gas Turbine power boosting
Highlights
The output of Gas turbine (GT) power plants operating in the arid and semiarid zones is affected by weather conditions where the warm air at the compressor intake decreases the air density and reduces the net output power far below the ISO standard (15 oC and 60% relative humidity)
In this study a new approach for boosting the power of gas turbine power plants by cooling the intake air is analyzed by the energy and exergy methods
The gas turbine inlet temperature is reduced by mixing chilled air from a Brayton refrigeration cycle and the main intake air stream
Summary
The output of Gas turbine (GT) power plants operating in the arid and semiarid zones is affected by weather conditions where the warm air at the compressor intake decreases the air density and reduces the net output power far below the ISO standard (15 oC and 60% relative humidity). In a recent study by Alhazmy et al (2006), they introduced two generic dimensionless terms (power gain ratio (PGR) and thermal efficiency change factor (TEC)) for assessment of intake air cooling systems They presented the results in general dimensionless working charts covering a wide range of working conditions. A novel approach has been presented by Zaki et al (2007), where a reverse Joule-Brayton air cycle was used to reduce the air temperature at the compressor inlet Their coupled cycle showed a range of parameters, where both the power and thermal efficiency can be simultaneously improved. Both the thermal and exergetic efficiencies are determined and the exergy destruction terms are evaluated
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