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http://dx.doi.org/10.7836/kses.2011.31.1.015

Performance Analysis of Ammonia-Water Regenerative Rankine Cycles for Use of Low-Temperature Energy Source  

Kim, Kyoung-Hoon (School of Mechanical Engineering, Kumoh National Institute of Technology)
Han, Chul-Ho (School of Mechanical Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Korean Solar Energy Society / v.31, no.1, 2011 , pp. 15-22 More about this Journal
Abstract
It is a great interest to convert more energy in the heat source into the power and to improve the efficiency of power generating processes. Since the efficiency of power generating processes becomes poorer as the temperature of the source decreases, to use an ammonia-water mixture instead of water as working fluid is a possible way to improve the efficiency of the system. In this work performance of ammonia-water regenerative Rankine cycle is investigated for the purpose of extracting maximum power from low-temperature waste heat in the form of sensible energy. Special attention is paid to the effect of system parameters such as mass fraction of ammonia and turbine inlet pressure on the characteristics of system. Results show that the power output increases with the mass fraction of ammonia in the mixture, however workable range of the mass fraction becomes narrower as turbine inlet pressure increases and is able to reach 16.5kW per unit mass flow rate of source air at $180^{\circ}C$.
Keywords
Low-temperature energy source; Ammonia-water mixture; Rankine cycle; Regeneration; Thermal efficiency; Maximum net work;
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