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Research Papers: Energy Systems Analysis

A Parametric Study on a Subcritical CO2/NH3 Cascade Refrigeration System for Low Temperature Applications

[+] Author and Article Information
Baris Yilmaz

Mechanical Engineering Department,
Faculty of Engineering,
Marmara University,
Kadikoy 34722, Istanbul, Turkey
e-mail: byilmaz@marmara.edu.tr

Ebru Mancuhan

Chemical Engineering Department,
Faculty of Engineering,
Marmara University,
Kadikoy 34722, Istanbul, Turkey
e-mail: emancuhan@marmara.edu.tr

Nasuh Erdonmez

Mechanical Engineering Department,
Faculty of Engineering,
Marmara University,
Kadikoy 34722, Istanbul, Turkey
e-mail: nasuherdonmez@gmail.com

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 17, 2017; final manuscript received April 6, 2018; published online May 7, 2018. Assoc. Editor: Mohamed A. Habib.

J. Energy Resour. Technol 140(9), 092004 (May 07, 2018) (7 pages) Paper No: JERT-17-1370; doi: 10.1115/1.4039976 History: Received July 17, 2017; Revised April 06, 2018

Adverse effects of synthetic refrigerants on the environment have led to replacing them with natural refrigerants. The common candidates are ammonia, carbon dioxide, and several hydrocarbon compounds and their mixtures. Ammonia has been used mainly in large-scale cooling purposes such as large-scale supermarkets and climatic rooms. However, in such systems, leakage of ammonia may arise severe results on human health and may damage products in the cooled space. Recently, in last decade, a well-known refrigerant, CO2, has gained more attention to be applied in refrigeration systems due to having prominent thermo-physical properties. The performance analysis of a CO2/NH3 cascade (CAS) system has been theoretically examined in the current study. The detailed performance analysis of the system and optimization of the operating parameters have been studied extensively. In addition, the second-law analysis of the system with both cycles has been performed. Optimum operating conditions of the system are also determined and correlations are developed. Finally, the coefficient of performance (COP) correlations developed by several researchers in literature and those of current study are compared against available experimental COP results. The comparisons showed that the proposed correlations can be utilized for the accurate prediction of the COP of a cascade CO2/NH3 system within the studied range of operating conditions.

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Figures

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Fig. 1

Simplified drawing of a two-stage cascade system

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Fig. 2

Total and component based exergy lost variation with TCAS,C (SC5 case)

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Fig. 3

The variation of the COP and second law efficiency with TCAS,C (SC5 case)

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Fig. 4

Total and component based exergy lost variation with TCAS,C (SC4 case)

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Fig. 5

The variation of the COP and second law efficiency with TCAS,C (SC4 case)

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Fig. 6

Total and component based exergy lost variation with TCAS,C (SC3 case)

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Fig. 7

The variation of the COP and second law efficiency with TCAS,C (SC3 case)

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Fig. 8

The COP contour lines obtained from specific correlations based on TC and TCAS,C parameters: (a) SC5, (b) SC4, and (c) SC3 cases

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Fig. 9

The COP contour lines obtained from general correlation based on TC and TET = 5 °C)

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