Performance analysis of a Brayton Barocaloric refrigeration cycle using (C9H19NH3)2CuBr4 as refrigerant

Balthazar, P; Islam, MS; Bennett, NS

Performance analysis of a Brayton Barocaloric refrigeration cycle using (C9H19NH3)2CuBr4 as refrigerant

Balthazar, P

Islam, MS Bennett, NS

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Publisher:: Springer Science and Business Media LLC
Publication Type:: Journal Article
Citation:: International Journal of Air-Conditioning and Refrigeration, 34, (1)

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Field	Value	Language
dc.contributor.author	Balthazar, P https://orcid.org/0000-0002-3273-4477
dc.contributor.author	Islam, MS
dc.contributor.author	Bennett, NS
dc.date.accessioned	2026-05-19T01:39:44Z
dc.date.available	2026-05-19T01:39:44Z
dc.identifier.citation	International Journal of Air-Conditioning and Refrigeration, 34, (1)
dc.identifier.issn	2010-1333
dc.identifier.uri	http://hdl.handle.net/10453/195049
dc.description.abstract	<jats:title>Abstract</jats:title> <jats:p> Barocaloric materials promise eco-friendly alternatives to vapour compression in refrigeration, with (C <jats:sub>9</jats:sub> H <jats:sub>19</jats:sub> NH <jats:sub>3</jats:sub> ) <jats:sub>2</jats:sub> CuBr <jats:sub>4</jats:sub> being a focus of this study. It is a highly promising barocaloric refrigerant due to the 0.4 K hysteresis temperature and operational pressure as low as 500 Bar. A reversible and irreversible Brayton Barocaloric refrigeration cycle analysis is established. For the irreversible cycle, the irreversibility during the compression and expansion process is considered in the two adiabatic processes. Performance characteristics are investigated across various indoor and outdoor temperature ranges, material operational temperature points, and operating pressures to determine the Coefficient of Performance (COP) and Dimensionless Refrigeration Capacity (DRC). The guidance for optimising the irreversible Brayton Barocaloric refrigeration cycle analysis is provided by disclosing the impact of the irreversibility of work process efficiency, timing ratio, and heat reservoir temperatures. Moreover, several specific cases are examined in detail. The results demonstrate that maximising the phase transition region of (C <jats:sub>9</jats:sub> H <jats:sub>19</jats:sub> NH <jats:sub>3</jats:sub> ) <jats:sub>2</jats:sub> CuBr <jats:sub>4</jats:sub> results in a COP of 10.8 achieved at a temperature span of 3.5 K while maintaining a 0.9-time ratio and conservative irreversibility efficiency of 0.8. This material is capable of cooling by 5.0 K with a reasonable COP of 2.5 at the 0.75-time ratio for a heat source temperature of 309 K and heat sink temperature of 314 K. Finally, this study demonstrates the potential for constructing a simple Barocaloric refrigeration system to validate the concept, with opportunities for further improvement through modifications. </jats:p>
dc.language	en
dc.publisher	Springer Science and Business Media LLC
dc.relation.ispartof	International Journal of Air-Conditioning and Refrigeration
dc.relation.isbasedon	10.1007/s44189-026-00107-4
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	4012 Fluid mechanics and thermal engineering
dc.subject.classification	4018 Nanotechnology
dc.title	Performance analysis of a Brayton Barocaloric refrigeration cycle using (C9H19NH3)2CuBr4 as refrigerant
dc.type	Journal Article
utslib.citation.volume	34
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
pubs.organisational-group	University of Technology Sydney/UTS Groups
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Advanced Manufacturing (CAM)
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/Engineering and IT Related HDR Students
utslib.copyright.status	open_access	*
dc.rights.license	This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/
dc.date.updated	2026-05-19T01:39:43Z
pubs.issue	1
pubs.publication-status	Published online
pubs.volume	34
utslib.citation.issue	1

Abstract:

Abstract Barocaloric materials promise eco-friendly alternatives to vapour compression in refrigeration, with (C 9 H 19 NH 3 ) 2 CuBr 4 being a focus of this study. It is a highly promising barocaloric refrigerant due to the 0.4 K hysteresis temperature and operational pressure as low as 500 Bar. A reversible and irreversible Brayton Barocaloric refrigeration cycle analysis is established. For the irreversible cycle, the irreversibility during the compression and expansion process is considered in the two adiabatic processes. Performance characteristics are investigated across various indoor and outdoor temperature ranges, material operational temperature points, and operating pressures to determine the Coefficient of Performance (COP) and Dimensionless Refrigeration Capacity (DRC). The guidance for optimising the irreversible Brayton Barocaloric refrigeration cycle analysis is provided by disclosing the impact of the irreversibility of work process efficiency, timing ratio, and heat reservoir temperatures. Moreover, several specific cases are examined in detail. The results demonstrate that maximising the phase transition region of (C 9 H 19 NH 3 ) 2 CuBr 4 results in a COP of 10.8 achieved at a temperature span of 3.5 K while maintaining a 0.9-time ratio and conservative irreversibility efficiency of 0.8. This material is capable of cooling by 5.0 K with a reasonable COP of 2.5 at the 0.75-time ratio for a heat source temperature of 309 K and heat sink temperature of 314 K. Finally, this study demonstrates the potential for constructing a simple Barocaloric refrigeration system to validate the concept, with opportunities for further improvement through modifications.

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http://hdl.handle.net/10453/195049