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Research Papers: Energy Systems Analysis

Advanced Exergy Analysis of a Compression–Absorption Cascade Refrigeration System

[+] Author and Article Information
Dario Colorado-Garrido

Centro de Investigación en Recursos
Energéticos y Sustentables,
Universidad Veracruzana,
Av. Universidad km 7.5, Col. Santa Isabel,
Coatzacoalcos CP 96535, Veracruz, México
e-mail: dcolorado@uv.mx

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 4, 2018; final manuscript received November 9, 2018; published online November 30, 2018. Assoc. Editor: Abel Hernandez-Guerrero.

J. Energy Resour. Technol 141(4), 042002 (Nov 30, 2018) (12 pages) Paper No: JERT-18-1253; doi: 10.1115/1.4042003 History: Received April 04, 2018; Revised November 09, 2018

This work presents a theoretical thermodynamic study of a compression–absorption cascade refrigeration system using R134a and a lithium bromide–water solution as working fluids. First and second law of thermodynamics analyses were carried out in order to develop an advanced exergetic analysis, by splitting the total irreversibility and that of every component. The potential for improvement of the system is quantified, in the illustrated base-case 55.4% of the irreversibility is of avoidable nature and it could be reduced. The evaporator is the component that shows a significant potential for improvement, followed by the cascade heat exchanger, the compressor, and finally, the generator. The results of the advanced exergetic analysis can be very useful for future design and experimentation of these kinds of systems.

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References

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Figures

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Fig. 1

Schematic of the compression–absorption cascade refrigeration system

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Fig. 2

Exergy destruction splitting following the advanced exergetic analysis

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Fig. 3

Coefficients of performance and nII for all three cycles configurations against heat source temperature

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Fig. 4

(a) Generator exergy destruction and (b) absorber exergy destruction against heat source temperature

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Fig. 5

(a) Cascade heat exchanger exergy destruction and (b) condenser exergy destruction against heat source temperature

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Fig. 6

(a) Compressor exergy destruction and (b) evaporator exergy destruction against heat source temperature

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Fig. 7

Coefficient of performance and exergetic efficiency against IT

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Fig. 8

(a) Generator exergy destruction and (b) absorber exergy destruction against IT

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Fig. 9

(a) Cascade heat exchanger exergy destruction and (b) condenser exergy destruction against IT

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Fig. 10

(a) Compressor exergy destruction and (b) evaporator exergy destruction against IT

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Fig. 11

Coefficients of performance and nII for all three cycles configurations against Teo

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Fig. 12

(a) Generator exergy destruction and (b) absorber exergy destruction against Teo

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Fig. 13

(a) Cascade heat exchanger exergy destruction and (b) condenser exergy destruction against Teo

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Fig. 14

(a) Compressor exergy destruction and (b) evaporator exergy destruction against Teo

Tables

Errata

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