Energy and exergy analysis of integrated system of ammonia-water Kalina-Rankine cycle

The integrated system of AWKRC (ammonia-water Kalina-Rankine cycle) is a novel cycle operated on MC (Kalina cycle) for power generation in non-heating seasons and on AWRC (ammonia-water Rankine cycle) for cogeneration of power and heating water in winter. The influences of inlet temperatures of both heat resource and cooling water on system efficiencies were analyzed based on the first law and the second law of thermodynamics. The calculation is based on following conditions that the heat resource temperature keeps 300 degrees C, the cooling water temperature for the KC or AWRC is respectively 25 degrees C or 15 degrees C; and the temperatures of heating water and backwater are respectively 90 degrees C and 40 degrees C. The results show that the evaluation indexes of the power recovery efficiency and the exergy efficiency of KC were respectively 18.2% and 41.9%, while the composite power recovery efficiency and the composite exergy efficiency of AWRC are respectively 21.1% and 43.0% accounting both power and equivalent power of cogenerated heating capacity, including 54.5% heating recovery ratio or 12.4% heating water exergy efficiency. The inventory flow diagrams of both energy and exergy gains and losses of the components operating on KC or AWRC are also demonstrated. (C) 2015 Elsevier Ltd. All rights reserved.