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Energy Analysis of Supercritical Water and Ammonia (Kalina) Power Cycle
Abtin Ataei 1 , Mohammad Yousef Alizadeh 1 , Mehdi Ali Ehyaei 2 , Mohammad Hossein Ahmadi * 3
1  Department of Energy Engineering, Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran
2  Department of Mechanical Engineeringof Pardis Islamic Azad University
3  Department of Renewable Energies, Faculty of New Science and Technologies, University of Tehran, Tehran, Iran

Published: 31 October 2014 by MDPI AG in The 4th World Sustainability Forum session Energy Sustainability
10.3390/wsf-4-e001
Abstract: The application of supercritical Rankine cycle iscommon in order to improve the energetic efficiency of thermal power plants,but due to the low temperature of the gas turbine exhaust outlet, theutilization of supercritical steam cycle as a bottoming cycle in combinedcycles is not possible. Therefore, to achieve a higher efficiency, water asworking fluid of the cycle, should be replaced with another fluid with a lowercritical temperature. For this purpose, water and ammonia mixture (Kalinacycle) has been selected as the bottoming cycle in this manuscript. Unlike thepure water, the mixture of water and ammonia does not evaporate in a constanttemperature, which reduces the evaporator's exergy lost in the heat transferprocess. The energetic efficiency of a supercritical Kalina cycle equipped withan over atmospheric condenser, under thermodynamic conditions of 515 oCand 165 Bar for the gas turbine, ammonia mass fraction are 30% and 70% forcondenser and boiler which is 12% more than Rankine cycle efficiency in the sameconditions. This article is dedicated to modeling and thermodynamic analysis ofa Kalina cycle and introduction of thermo-physical properties of the water andammonia mixture in process of evaporation and condensation. In addition, theperformance comparison of the Kalina cycle and Rankine cycle in terms ofdifferent thermodynamic conditions is issued in this paper.
Keywords: Kalina cycle; rankine cycle; supercritical pressure; thermodynamic modeling; water and ammonia mixture
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