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Research Papers: Energy Systems Analysis

Experimental and Theoretical Analysis of the Goswami Cycle Operating at Low Temperature Heat Sources

[+] Author and Article Information
Gokmen Demirkaya

Gama Power Systems,
Bestepeler Mah. Nergis Sok. No: 9 Kat:12,
Sogutozu, Ankara 06520, Turkey
e-mail: gokmen.demirkaya@gama.com.tr

Ricardo Vasquez Padilla

School of Environment,
Science and Engineering,
Southern Cross University,
Lismore 2480, NSW, Australia
e-mail: ricardo.vasquez.padilla@scu.edu.au

Armando Fontalvo

Department of Energy,
Universidad de la Costa,
Barranquilla 080002, Colombia
e-mail: afontalv17@cuc.edu.co

Antonio Bula

Department of Mechanical Engineering,
Universidad del Norte,
Barranquilla 081007, Colombia
e-mail: abula@uninorte.edu.co

D. Yogi Goswami

Clean Energy Research Center,
University of South Florida,
Tampa, FL 33620
e-mail: goswami@usf.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received May 21, 2017; final manuscript received December 4, 2017; published online March 15, 2018. Assoc. Editor: Luis Serra.

J. Energy Resour. Technol 140(7), 072005 (Mar 15, 2018) (13 pages) Paper No: JERT-17-1235; doi: 10.1115/1.4039376 History: Received May 21, 2017; Revised December 04, 2017

The Goswami cycle is a cycle that combines an ammonia–water vapor absorption cycle and a Rankine cycle for cooling and mechanical power purposes by using thermal heat sources such as solar energy or geothermal steam. In this paper, a theoretical investigation was conducted to determine the performance outputs of the cycle, namely, net mechanical power, cooling, effective first law efficiency and exergy efficiency, for a boiler and an absorber temperature of 85 °C and 35 °C, respectively, and different boiler pressures and ammonia-water concentrations. In addition, an experimental investigation was carried out to verify the predicted trends of theoretical analysis and evaluate the performance of a modified scroll expander. The theoretical analysis showed that maximum effective first law and exergy efficiencies were 7.2% and 45%, respectively. The experimental tests showed that the scroll expander reached a 30–40% of efficiency when boiler temperature was 85 °C and rectifier temperature was 55 °C. Finally, it was obtained that superheated inlet conditions improved the efficiency of the modified expander.

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Figures

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Fig. 1

Photograph of the Goswami cycle experimental setup

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Fig. 2

Schematic drawing of Goswami cycle and the experimental system

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Fig. 3

Assembled absorber unit

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Fig. 4

Modified scroll expander used for experimental testing

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Fig. 5

Network output of the Goswami cycle at a boiler temperature of 85 °C without rectification. Input parameters are given in Table 2. xstrong: Ammonia mass fraction.

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Fig. 6

Effective first law and exergy efficiencies of the Goswami cycle at a boiler temperature of 85 °C without rectification. Input parameters are given in Table 2. xstrong: Ammonia mass fraction.

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Fig. 7

Optimum network and cooling outputs of the Goswami cycle for rectification temperatures in the range of 35–75 °C andboiler temperature of 85 °C. Input parameters are given in Table 2.

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Fig. 8

Optimum effective first law and exergy efficiency of the Goswami cycle for rectification temperatures in the range of 35–75 °C and boiler temperature of 85 °C. Input parameters are given in Table 2.

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Fig. 9

Optimum network and cooling outputs of the Goswami cycle for expander isentropic efficiencies the range of 30–50% and boiler temperature of 85 °C. Input parameters are given in Table 2.

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Fig. 10

Optimum effective first law and effective exergy efficiencies of the Goswami cycle for expander isentropic efficiencies the range of 30–50% and boiler temperature of 85 °C. Input parameters are given in Table 2.

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Fig. 11

Measured and simulation values of vapor mass flow fraction

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Fig. 12

Experimental measurement of the expander performance

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Fig. 13

Experimental measurement of the expander performance

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Fig. 14

Expected performance of the expander for low expander temperature inlet. Pexit: outlet expander pressure.

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