Paper Title
Exergetical Performance Analysis of Kalina and Organic Rankine Cycles

Abstract
The organic Rankine cycle (ORC) and the Kalina cycle system (KCS) are being considered as the most feasible and promising ways for recovery of low-grade finite heat sources. This paper presents a comparative exergetical performance analysis for ORC and Kalina cycle using ammonia-water mixture as the working fluid for recovery of low-grade heat. Effects of the system parameters such as working fluid, turbine inlet pressure, and mass fraction of ammonia on the exergetical performance are parametrically investigated. Results show that KCS does not show higher exergy efficiency, however, shows lower exergy destruction ratio of source heat exchanger and higher second-law efficiency than ORC. Index Terms - Organic Rankine cycle, Kalina cycle, ammonia-water mixture, low-grade heat source, exergy.