Zobrazeno 1 - 10
of 635
pro vyhledávání: '"R744"'
Publikováno v:
Frontiers in Mechanical Engineering, Vol 10 (2024)
Validated CO2 ejector models are essential for developing high-performance refrigeration and heat pump cycles. This study focuses on assessing the Homogeneous Equilibrium Model’s applicability to simulate a CO2 flashing ejector at a reduced pressur
Externí odkaz:
https://doaj.org/article/ff7e1958e37c445ba89f117b1ba7734d
Autor:
B. S. Arun, George Ninan, S. Murali, Manoj Samuel, Sumit Kumar, S. Vaishak, Mani Sankar Dasgupta, Sarun Kumar Kochunni, Armin Hafner, Kristina Norne Widell
Publikováno v:
International Journal of Air-Conditioning and Refrigeration, Vol 32, Iss 1, Pp 1-17 (2024)
Abstract Four hot-gas bypass defrosting configurations for CO2-NH3 cascade blast freezer for application in fish processing firm are numerically investigated. Due to the high moisture content of fish, defrosting is necessary after every 4 to 5 h of b
Externí odkaz:
https://doaj.org/article/8aa4d33a9ac148deba78b93817901497
Autor:
Min-Ju Jeon, Joon-Hyuk Lee
Publikováno v:
Energies, Vol 17, Iss 18, p 4708 (2024)
The cascade refrigeration systems (CRS) used in hypermarkets and supermarkets, which are used by many people, have been employing R744 for the low-temperature cycle (LTC) and R404A for the high-temperature cycle (HTC) due to environmental and public
Externí odkaz:
https://doaj.org/article/b4e16f851a3247cd92343c825afcb1c2
Publikováno v:
Applied Sciences, Vol 14, Iss 17, p 7735 (2024)
This paper proposes, for the first time, the research concept of comparing energy and economy between transcritical cycle high-temperature heat pumps and subcritical cycle high-temperature heat pumps with new refrigerants. Experiments and simulations
Externí odkaz:
https://doaj.org/article/225e8b63e7a04d2f892c28192dc89fd2
Autor:
Min-Ju Jeon, Joon-Hyuk Lee
Publikováno v:
Energies, Vol 17, Iss 17, p 4481 (2024)
The R744/R404A cascade refrigeration system (CRS) has been widely used in supermarkets and hypermarkets, but due to the refrigerant regulation of R404A, research on alternative refrigerants is necessary. In addition, although there have been quite a
Externí odkaz:
https://doaj.org/article/2a677ad9ae484dc6b3f06034e4cb9ebb
Autor:
Min-Ju Jeon, Joon-Hyuk Lee
Publikováno v:
Energies, Vol 17, Iss 16, p 4127 (2024)
In this study, the performance characteristics of an R404A indirect refrigeration system (IRS) applied to an internal heat exchanger (IHX) is evaluated for supermarkets and hypermarkets. In a direct expansion system, R404A is the primary refrigerant
Externí odkaz:
https://doaj.org/article/1664a74aa7e044349d62af81722ced07
Autor:
Min-Ju Jeon, Joon-Hyuk Lee
Publikováno v:
Energies, Vol 17, Iss 16, p 4143 (2024)
Although the R404A indirect refrigeration system (IRS) with an internal heat exchanger (IHX) and R744 as the secondary fluid has potential applications in supermarkets and hypermarkets, the exergy characteristics of this IRS have not been extensively
Externí odkaz:
https://doaj.org/article/6872eb6f3faa46378122087cd35ebc9a
Autor:
Meltem Koşan
Publikováno v:
Hittite Journal of Science and Engineering, Vol 10, Iss 3, Pp 243-248 (2023)
Cascade refrigeration systems are preferred in applications where low temperature cooling is required, such as in some special industrial and laboratory applications. Since, in these systems, the energy consumed by the compressors is less and the com
Externí odkaz:
https://doaj.org/article/fe558ccaf65b4d64a1bc18d165880fc9
Autor:
Cosmin-Mihai Udroiu, Adrián Mota-Babiloni, Pau Giménez-Prades, Ángel Barragán-Cervera, Joaquín Navarro-Esbrí
Publikováno v:
Energy Conversion and Management: X, Vol 20, Iss , Pp 100446- (2023)
Carbon dioxide (CO2, R744) is the only refrigerant in the safest class by the ASHRAE 34 Standard in the group of natural refrigerants, with zero ozone depletion potential and a global warming potential of 1. It has been recently proposed for commerci
Externí odkaz:
https://doaj.org/article/5206decf3bf04a81977f046a57dfa634
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