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Parametric analysis of hybrid elastocaloric – ▫$CO_2$▫ cooling system
ID
Nebot-Andrés, Laura
(
Author
),
ID
Petruzziello, Fabio
(
Author
),
ID
Aprea, Ciro
(
Author
),
ID
Llopis, Rodrigo
(
Author
),
ID
Žerovnik, Andrej
(
Author
),
ID
Maiorino, Angelo
(
Author
),
ID
Tušek, Jaka
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S1359431124015114
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Abstract
This study examines the potential application of elastocaloric refrigeration (eC) technology for the subcooling of ▫$CO_2$▫ in transcritical single-stage refrigeration cycles. Elastocaloric refrigeration, a solid-state refrigeration technology, possesses significant untapped potential due to its environmentally friendly characteristics, primarily its lack of harmful operational fluids. However, its direct stand-alone application has been limited due to the relatively small temperature spans produced by current proof-of-concept elastocaloric devices. Efforts of the scientific community have focused on extending the temperature difference that eC systems can provide, while this work offers an alternative to that challenge, offering an application solution for the current state of technology. The study proposes for the first-time a unique integration of eC technology and ▫$CO_2$▫ cooling systems, aiming to capitalise on the respective weaknesses of these technologies and transform them into strengths. In the proposed solution, an eC device operates as an external agent to subcool ▫$CO_2$▫, with the objective of enhancing the energy performance of the refrigeration system. This concept is motivated by the recent advancements in ▫$CO_2$▫ cooling systems and the growing recognition of subcooling as a promising method to boost the performance of such systems. The hybrid system’s performance was evaluated across various ambient temperatures, ranging from 20 ◦C to 35 ◦C, and at an evaporating level of -15 ◦C. It is evaluated by means of a calculation model based on the data obtained experimentally from an elastocaloric regenerator and an experimental ▫$CO_2$▫ plant. The system‘s energy efficiency was analysed in comparison to a non-subcooled ▫$CO_2$▫ cycle, and a third cycle comprising both eC subcooling and an expander for energy recovery from the expansion process. The results demonstrated a considerable increase in the coefficient of performance (COP) with the use of eC subcooling: increments of 2.7 % at 20 ◦C, 4.5 % at 25 ◦C, 9.6 % at 30 ◦C and 13.1 % at 35 ◦C, where more significant increments were observed at higher ambient temperatures. The eC Subcooler with expander reaches increments of 7.5 %, 11.1 %, 18.1 % and 22.2 % respectively. Additionally, the eC subcooler allowed a reduction in the optimum gas-cooler pressure by up to 5 bar at the highest environment temperature. Despite these promising results, the study underscores the necessity for further optimisation and improvement of elastocaloric devices. Additionally, it emphasizes the importance of energy recovery strategies from the expansion process in transcritical ▫$CO_2$▫ cooling system.
Language:
English
Keywords:
carbon dioxide
,
elastocaloric
,
subcooling
,
modelling
,
optimization
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2024
Number of pages:
10 str.
Numbering:
Vol. 253, art. 123843
PID:
20.500.12556/RUL-161269-f46ed55a-f866-bafb-b54d-d4bffd938150
UDC:
621.56:546.264-31
ISSN on article:
1359-4311
DOI:
10.1016/j.applthermaleng.2024.123843
COBISS.SI-ID:
206758147
Publication date in RUL:
09.09.2024
Views:
31
Downloads:
41
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Record is a part of a journal
Title:
Applied thermal engineering
Shortened title:
Appl. therm. eng.
Publisher:
Elsevier Science
ISSN:
1359-4311
COBISS.SI-ID:
1861910
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
ogljikov dioksid
,
elastokalorični učinek
,
podhlajevanje
,
modeliranje
,
optimizacija
Projects
Funder:
EC - European Commission
Funding programme:
NextGenerationEU, PRTR
Project number:
TED2021-130162B-I00
Funder:
Other - Other funder or multiple funders
Funding programme:
University of Ljubljana
Name:
Razvoj prototipa hibridne elastokalorične in parno-kompresorske toplotne naprave
Acronym:
FutureECOool
Funder:
Other - Other funder or multiple funders
Funding programme:
Ministerio de Ciencia e Innovacóin of Spain
Project number:
PID2021126926OB-C21
Funder:
Other - Other funder or multiple funders
Funding programme:
University of Ljubljana
Project number:
820-1/2020-34
Funder:
ARIS - Slovenian Research and Innovation Agency
Project number:
P2-0422
Name:
Funkcionalne tekočine za napredne energetske sisteme
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