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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September 2018
Research-Article
A Parametric Study on a Subcritical CO2/NH3 Cascade Refrigeration System for Low Temperature Applications
Baris Yilmaz,
Baris Yilmaz
Mechanical Engineering Department,
Faculty of Engineering,
Marmara University,
Kadikoy 34722, Istanbul, Turkey
e-mail: byilmaz@marmara.edu.tr
Faculty of Engineering,
Marmara University,
Kadikoy 34722, Istanbul, Turkey
e-mail: byilmaz@marmara.edu.tr
Search for other works by this author on:
Ebru Mancuhan,
Ebru Mancuhan
Chemical Engineering Department,
Faculty of Engineering,
Marmara University,
Kadikoy 34722, Istanbul, Turkey
e-mail: emancuhan@marmara.edu.tr
Faculty of Engineering,
Marmara University,
Kadikoy 34722, Istanbul, Turkey
e-mail: emancuhan@marmara.edu.tr
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Nasuh Erdonmez
Nasuh Erdonmez
Mechanical Engineering Department,
Faculty of Engineering,
Marmara University,
Kadikoy 34722, Istanbul, Turkey
e-mail: nasuherdonmez@gmail.com
Faculty of Engineering,
Marmara University,
Kadikoy 34722, Istanbul, Turkey
e-mail: nasuherdonmez@gmail.com
Search for other works by this author on:
Baris Yilmaz
Mechanical Engineering Department,
Faculty of Engineering,
Marmara University,
Kadikoy 34722, Istanbul, Turkey
e-mail: byilmaz@marmara.edu.tr
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
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
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. Sep 2018, 140(9): 092004 (7 pages)
Published Online: May 7, 2018
Article history
Received:
July 17, 2017
Revised:
April 6, 2018
Citation
Yilmaz, B., Mancuhan, E., and Erdonmez, N. (May 7, 2018). "A Parametric Study on a Subcritical CO2/NH3 Cascade Refrigeration System for Low Temperature Applications." ASME. J. Energy Resour. Technol. September 2018; 140(9): 092004. https://doi.org/10.1115/1.4039976
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