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Research Papers: Energy Systems Analysis

Advanced Exergetic Assessment of a Vapor Compression Cycle With Alternative Refrigerants

[+] Author and Article Information
Nishant Modi

School of Technology,
Pandit Deendayal Petroleum University,
Gandhinagar 382007, Gujarat, India
e-mail: nishant.mmtmc17@sot.pdpu.ac.in

Bhargav Pandya

School of Chemical Engineering,
University of Birmingham,
Birmingham B15 2TT, UK
e-mail: bxp815@student.bham.ac.uk

Jatin Patel

School of Technology,
Pandit Deendayal Petroleum University,
Gandhinagar 382007, Gujarat, India
e-mail: jatin.patel@spt.pdpu.ac.in

Anurag Mudgal

School of Technology,
Pandit Deendayal Petroleum University,
Gandhinagar 382007, Gujarat, India
e-mail: anurag.mudgal@sot.pdpu.ac.in

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received December 20, 2018; final manuscript received March 15, 2019; published online April 4, 2019. Assoc. Editor: Esmail M. A. Mokheimer.

J. Energy Resour. Technol 141(9), 092002 (Apr 04, 2019) (9 pages) Paper No: JERT-18-1902; doi: 10.1115/1.4043249 History: Received December 20, 2018; Accepted March 16, 2019

The present study compares the thermal performance of various alternative refrigerants with conventional refrigerant operating on a vapor compression cycle with energetic, exergetic, and advanced exergetic approaches. Appropriate alternative refrigerants are selected for the analysis, and R1234yf is recommended as the best suitable refrigerant to replace the existing refrigerants. By splitting the exergy destruction into endogenous and unavoidable, endogenous and avoidable, exogenous and unavoidable, and exogenous and avoidable parts, an advanced exergy method depicts the real potentials for the improvement in the thermal system. Moreover, a traditional exergy method prefers condenser for performance improvement as it has 18.48% higher exergy destruction than evaporator, whereas the advanced exergy method proposes evaporator rather than condenser since its endogenous and avoidable destruction part is 26.38% more than condenser for R1234yf refrigerant.

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Figures

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Fig. 1

Schematic diagram of the examined vapor compression system

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Fig. 2

Hybrid cycles for various components: (a) compressor, (b) condenser, (c) expansion valve, and (d) evaporator

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Fig. 3

Unavoidable cycle for the vapor compression system

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Fig. 4

Splitting of exergy destruction within the component “k

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Fig. 5

Comparison of the coefficient of performance for various refrigerants

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Fig. 6

Comparison of exergetic efficiency for various refrigerants

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Fig. 7

Splitting of exergy destruction for R134a: (a) total exergy destruction, (b) unavoidable and avoidable part, (c) compressor, (d) condenser, (e) expansion valve, and (f) evaporator

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Fig. 8

Splitting of exergy destruction for R143m: (a) total exergy destruction, (b) unavoidable and avoidable part, (c) compressor, (d) condenser, (e) expansion valve, and (f) evaporator

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Fig. 9

Splitting of exergy destruction for R1234yf: (a) total exergy destruction, (b) unavoidable and avoidable part, (c) compressor, (d) condenser, (e) expansion valve, and (f) evaporator

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Fig. 10

Splitting of exergy destruction for R161: (a) total exergy destruction, (b) unavoidable and avoidable part, (c) compressor, (d) condenser, (e) expansion valve, and (f) evaporator

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Fig. 11

Splitting of exergy destruction for R513A: (a) total exergy destruction, (b) unavoidable and avoidable part, (c) compressor, (d) condenser, (e) expansion valve, and (f) evaporator

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Fig. 12

Splitting of exergy destruction for R1270: (a) total exergy destruction, (b) unavoidable and avoidable part, (c) compressor, (d) condenser, (e) expansion valve, and (f) evaporator

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