Thermo-statistical study of sustainable refrigeration system for stack flow heat recovery of combined gas turbine-steam turbine power generation

Abstract

Abstract The major part of input heat of power plant is lost during the exhaust flow process and this flue gas has tremendous potential for heat recovery and cooling generation. The employment of LiBr-H2O based eco- friendly and less energy consumption vapour absorption refrigeration system (VARS) is integrated with stack flow unit of combined gas turbine and steam turbine (GT-ST) plant. If thestack flow temperature is maintained about 200–250 0C, the projected VARS is suitable for the generation of efficient cooling effect. The main highlights of this research work have been concluded in terms of exergy losses in components, exergetic& overall efficiency of combined plant. The maximum irreversibility has been found in combustion chamber (CC) of GT system and exhaust flow ofST system as 66.8% and 13.4% respectively. The effect of GT plant efficiency influences the overall performance. The proposed VARS performance coefficient estimated as 0.708 with 05 ton of refrigeration effect which is valuable achievement for space cooling purpose for plant infrastructure and efficiently it can replace high grade energy consumption vapour compression refrigeration system (VCRS) type air conditioning system. This eminence cooling technology of VARS system can save 10,440 USD yearly in terms of energy and carbon emission, and able to map the de-carbonized economy infrastructure. The methane fuel gas has found remarkable performance at 8 bar of compressor pressure and 900 0C GT inlet temperature (GTIT) of operating condition with all set of operating factors by using MLR method of DOE. The determination coefficient (R2) is computed as 0.991 which gives minimum deviation between actual and predicted results.