The Potential Impact of the Small-scale Ejector on the R744 Transcritical Refrigeration
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24210%2F21%3A00009206" target="_blank" >RIV/46747885:24210/21:00009206 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0196890421010360" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0196890421010360</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.enconman.2021.114860" target="_blank" >10.1016/j.enconman.2021.114860</a>
Alternative languages
Result language
angličtina
Original language name
The Potential Impact of the Small-scale Ejector on the R744 Transcritical Refrigeration
Original language description
The evident adverse effects of climate change and the consequences of global warming has left an exigent circumstance requiring crucial actions on the applications and technology of refrigeration and air conditioning systems as it concerns its tremendous indirect contributions to greenhouse gas emissions. This field has witnessed steady expansion in recent times. The attendant high-grade energy consumption calls for pragmatic approaches to developing innovative technologies aimed at energy management and finding measures to curb global warming. This current study intends to illustrate the impact of implementing a small-size ejector profile on the R744 transcritical refrigeration system to improve the system performance by recovering some expansion work and reduce power consumption. The ejector-supported system was compared with the parallel compression concept as the baseline system and carried out at different pressure lift and exit gas cooler properties. The result indicated a COP and exergy efficiency improvement up to 2.05% and 1.92% for the set conditions respectively, while the COP could be improved to the highest of 11.22% when the system cooling load is at minimum. Moreover, the ejector played a vital role in the system input power, where up to 3.46% of the energy consumption was reduced at subcritical heat rejection conditions. Operating the system with an ejector at a lower cooling capacity allows a further 18% reduction in overall power consumption. In addition, the exergy analysis revealed a noticeable lack of total system exergy destruction by deploying the ejector in parallel with the highpressure valve, which recovered 21% of the expansion work and saved 46% of the HPV exergy losses. Furthermore, the result exhibited a maximum system exergy loss of 7.8% at the set condition and a maximum of 13.2% total system exergy destruction rate recovered by the ejector, which depends on the cooling load.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20303 - Thermodynamics
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Energy Conversion and Management
ISSN
0196-8904
e-ISSN
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Volume of the periodical
249
Issue of the periodical within the volume
114860
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
13
Pages from-to
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UT code for WoS article
000712665900001
EID of the result in the Scopus database
2-s2.0-85117708006