Organic Working Fluids for a Combined Power and Cooling Cycle

[+] Author and Article Information
Sanjay Vijayaraghavan

D. Y. Goswami

Mechanical and Aerospace Engineering Department University of Florida, P.O. Box 116300 Gainesville, Florida 32611-6300goswami@ufl.edu

J. Energy Resour. Technol 127(2), 125-130 (Feb 06, 2005) (6 pages) doi:10.1115/1.1885039 History: Received November 12, 2003; Revised February 06, 2005

A new thermodynamic cycle has been developed for the simultaneous production of power and cooling from low-temperature heat sources. The proposed cycle combines the Rankine and absorption refrigeration cycles, providing power and cooling as useful outputs. Initial studies were performed with an ammonia-water mixture as the working fluid in the cycle. This work extends the application of the cycle to working fluids consisting of organic fluid mixtures. Organic working fluids have been used successfully in geothermal power plants, as working fluids in Rankine cycles. An advantage of using organic working fluids is that the industry has experience with building turbines for these fluids. A commercially available optimization program has been used to maximize the thermodynamic performance of the cycle. The advantages and disadvantages of using organic fluid mixtures as opposed to an ammonia-water mixture are discussed. It is found that thermodynamic efficiencies achievable with organic fluid mixtures, under optimum conditions, are lower than those obtained with ammonia-water mixtures. Further, the refrigeration temperatures achievable using organic fluid mixtures are higher than those using ammonia-water mixtures.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 8

Maximum (limiting) pressure ratio using some working fluid mixtures at various basic solution concentrations in the absorber and using a 360K heat source

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Figure 1

Diagram showing the combined power and cooling cycle configuration

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Figure 2

Representation on the phase diagram of a part of the cycle using isobutane-n-decane at 400K, optimized for exergy efficiency

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Figure 3

Close up of a portion of Fig. 2

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Figure 4

Maximum exergy efficiency using different working fluids

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Figure 5

Maximum resource utilization efficiencies using different working fluids

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Figure 6

Observed pressure ratios corresponding to the efficiencies plotted in Fig. 4

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Figure 7

Observed pressure ratios corresponding to the efficiencies plotted in Fig. 5



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