Thermodynamic analysis of ammonia mass fraction effect on simple Kalina cycle system performance.

This work studied the effect of ammonia mass fraction on Kalina cycle system performance with NH3−H2O as working fluid. The mass fractions used in this theoretical study are 0.85, 0.86, 0.87, 0.88 and 0.89. The inlet turbine temperature is 160°C. The maximum pressure varies from 35 bar to 50 bar with step 5 bar and minimum pressure are 1, 2, 3 and 4 bar. The dryness fraction at separator entrance is 0.3. The waste heat of combustion products from boiler is used as the source of energy. The temperature of this combustion products is 175°C. The results showed that the highest thermal efficiency and exergy efficiency are about 9.6% and 56% respectively at x=0.85, Pmax=50 bar and Pmin = 2 bar. While the network is 0.139 kW at the same conditions. The highest exergy destruction is found in the vapour generator is 52% compare with other components at ammonia mass fraction x=0.89, maximum pressure Pmax =35 bar and minimum pressure Pmin =2 bar and dryness fraction DF=0.3. The highest exergy destruction is found at heat recovery vapour generator is 0.62 kW at Pmax =35bar, Pmin =2bar and x=0.85. [ABSTRACT FROM AUTHOR]