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RESEARCH PAPERS

Development of a Novel Combined Absorption Cycle for Power Generation and Refrigeration

[+] Author and Article Information
Na Zhang2

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, P. R. Chinazhangna@mail.etp.ac.cn

Noam Lior

Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104-6315

2

Corresponding author.

J. Energy Resour. Technol 129(3), 254-265 (Jul 23, 2006) (12 pages) doi:10.1115/1.2751506 History: Received March 07, 2006; Revised July 23, 2006

Cogeneration can improve energy utilization efficiency significantly. In this paper, a new ammonia-water system is proposed for the cogeneration of refrigeration and power. The plant operates in a parallel combined cycle mode with an ammonia-water Rankine cycle and an ammonia refrigeration cycle, interconnected by absorption, separation, and heat transfer processes. The performance was evaluated by both energy and exergy efficiencies, with the latter providing good guidance for system improvement. The influences of the key parameters, which include the basic working solution concentration, the cooling water temperature, and the Rankine cycle turbine inlet parameters on the cycle performance, have been investigated. It is found that the cycle has a good thermal performance, with energy and exergy efficiencies of 27.7% and 55.7%, respectively, for the base-case studied (having a maximum cycle temperature of 450°C). Comparison with the conventional separate generation of power and refrigeration having the same outputs shows that the energy consumption of the cogeneration cycle is markedly lower. A brief review of desirable properties of fluid pairs for such cogeneration cycles was made, and detailed studies for finding new fluid pairs and the impact of their properties on cogeneration system performance are absent and are very recommended.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

The flow sheet of the combined power/refrigeration cycle

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Figure 2

The heat exchange t-Q diagram in the cogeneration cycle

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Figure 3

The exergy flow diagram for the combined power/refrigeration cycle (the numbers are the fluid states, Fig. 1)

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Figure 4

The effect of turbine inlet temperature, t8

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Figure 5

The effect of turbine inlet pressure, p8

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Figure 6

The effect of basic solution ammonia mass fraction, X

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Figure 7

The effect of coolant cooling water temperature, tw

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Figure 8

The heat exchange t-Q diagram in the Kalina/refrigeration separate system (option 1)

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Figure 9

The heat exchange t-Q diagram in the Rankine/refrigeration separate system (option 2)

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Figure 10

The flow sheet of the alternative combined power/refrigeration cycle

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Figure 11

Performance of the alternative cycle described in Fig. 1

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