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RESEARCH PAPERS

The Performance of the Kalina Cycle System 11(KCS-11) With Low-Temperature Heat Sources

[+] Author and Article Information
H. D. Madhawa Hettiarachchi, Mihajlo Golubovic

Department of Mechanical and Industrial Engineering,  University of Illinois at Chicago, 842 W. Taylor Street, Chicago, IL 60607wworek@uic.edu

William M. Worek1

Department of Mechanical and Industrial Engineering,  University of Illinois at Chicago, 842 W. Taylor Street, Chicago, IL 60607wworek@uic.edu

Yasuyuki Ikegami

Institute of Ocean Energy,  Saga University, Honjomachi 1, Saga 840-8502, Japan

1

Corresponding author.

J. Energy Resour. Technol 129(3), 243-247 (Feb 24, 2007) (5 pages) doi:10.1115/1.2748815 History: Received May 03, 2006; Revised February 24, 2007

The possibility of exploiting low-temperature heat sources has been of great significance with ever increasing energy demand. Optimum and cost-effective design of the power cycles provide a means of utilization of low-temperature heat sources which might otherwise be discarded. In this analysis, the performance of the Kalina cycle system 11 (KCS11) is examined for low-temperature geothermal heat sources and is compared with an organic Rankine cycle. The effect of the ammonia fraction and turbine inlet pressure on the cycle performance is investigated in detail. Results show that for a given turbine inlet pressure, an optimum ammonia fraction can be found that yields the maximum cycle efficiency. Further, the maximum cycle efficiency does not necessarily yield the optimum operating conditions for the system. In addition, it is important to consider the utilization of the various circulating media (i.e., working fluid, cooling water, and heat resource) and heat exchanger area per unit power produced. For given conditions, an optimum range of operating pressure and ammonia fraction can be identified that result in optimum cycle performance. In general, the KCS11 has better overall performance at moderate pressures than that of the organic Rankine cycle.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of the Kalina cycle system 11 (KCS11)

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Figure 2

Temperature-ammonia mass fraction diagram (T‐Y) of the Kalina cycle system considered (for the case of Y5=0.8 and P6=3MPa)

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Figure 3

Flow chart of the simulation procedure

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Figure 4

Efficiency with ammonia mass fraction at different turbine inlet pressures

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Figure 5

Performance of the Kalina cycle system (KCS11) with turbine inlet pressure

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Figure 6

Performance of the Kalina cycle system (KCS11) with ammonia mass fraction

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Figure 7

Kalina (KCS11) and Rankine cycle performance comparison

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