Exergy Analysis of High-Temperature Kalina Cycle Configurations Integrated with a Solar Central Receiver

The integration of high-temperature Kalina cycles with solar central receiver systems offers a promising pathway for enhancing the efficiency of concentrated solar power (CSP) systems. This study presents a comprehensive exergy analysis of four high-temperature Kalina cycle configurations (KC۱۲, KC۱۲۳, KC۲۳۴, and KC۱۲۳۴), distinguished by the number and placement of recuperators, to optimize thermodynamic performance under operating conditions of ۵۰۰°C, turbine inlet pressures of ۱۰۰–۱۴۰ bar, and ammonia mass fractions of ۰.۵–۰.۸. Utilizing molten salt as the heat transfer medium, the configurations were modeled with a solar central receiver tower and analyzed using Engineering Equation Solver (EES) to evaluate exergy destruction and efficiency. The results indicate that the KC۱۲۳۴ configuration achieves the highest exergy efficiency (۳۱.۴۵%) at ۱۴۰ bar and ۰.۸ ammonia mass fraction, driven by enhanced heat recovery from additional recuperators. The evaporator and solar receiver were identified as the primary sources of exergy destruction, contributing approximately ۶۰% and ۲۲% of total losses, respectively, due to significant temperature gradients.

کلیدواژه ها:

Exergy Analysis ، Solar Central Receiver ، Kalina Cycle ، Exergy Destruction