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Technical Brief

First and Second Law Analyses of Double Effect Parallel and Series Flow Direct Fired Absorption Cycles for Optimum Operating Parameters

[+] Author and Article Information
Md. Azhar

Zakir Husain College of Engineering & Technology,
Department of Mechanical Engineering,
Aligarh Muslim University,
Aligarh, Uttar Pradesh 202002, India
e-mails: md_azhar@zhcet.ac.in; azharishtiyaque@gmail.com

M. Altamush Siddiqui

Zakir Husain College of Engineering & Technology,
Department of Mechanical Engineering,
Aligarh Muslim University,
Aligarh, Uttar Pradesh 202002, India
e-mail: altamushsiddiqui@yahoo.co.in

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received December 10, 2018; final manuscript received May 23, 2019; published online June 5, 2019. Assoc. Editor: Abel Hernandez-Guerrero.

J. Energy Resour. Technol 141(12), 124501 (Jun 05, 2019) (7 pages) Paper No: JERT-18-1884; doi: 10.1115/1.4043880 History: Received December 10, 2018; Accepted May 27, 2019

Thermodynamic analysis of double effect parallel and series flow direct fired absorption systems with lithium bromide–water has been carried out for different operating conditions. Temperatures in primary generator (Tg) and secondary generator (Tgs)/secondary condenser (Tcs) are optimized analytically using an iterative technique for maximum coefficient of performance (COP) and minimum energy required. A solution distribution ratio for a parallel flow cycle is also optimized. Source of energy used to drive the cycles is considered as compressed natural gas (CNG) and liquefied petroleum gas (LPG). Exergy destruction rate (EDR) in individual components as well as in the whole cycle along with volume flow rate of LPG and CNG is presented and compared. Results show that maximum COP for the parallel flow cycle is 3–6% higher than the series flow cycle. Also, minimum EDR of the parallel flow cycle is around 4% less while energy consumption is 2–3% low as compared to the series flow cycle.

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Figures

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Fig. 1

Schematic diagram of the double effect vapor absorption refrigeration cycle (Color version online.)

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Fig. 2

Variation of COP in the double effect parallel flow cycle with Tg at different Te

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Fig. 3

Variation of COP in the parallel flow cycle with Tg at different Tcs

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Fig. 4

Variation of maximum COP in the parallel flow cycle with temperatures Tcs and Tg at different Te

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Fig. 5

Variation of maximum COP in the series flow cycle with temperatures Tcs and Tg at different Te

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Fig. 6

Variation of maximum COP in the double effect parallel flow cycle with Z at different Te

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Fig. 7

Comparison of COP and generator heat load for parallel and series flow cycles

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Fig. 8

Comparison of EDR and volume flow rate for parallel and series flow cycles

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Fig. 9

Comparison of EDR of each component for parallel and series flow cycles

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