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http://krishi.icar.gov.in/jspui/handle/123456789/82849
Title: | Study on various hot-gas defrosting configurations for CO2-NH3 cascade deep freezer |
Other Titles: | Not Available |
Authors: | Arun, B. S. George Ninan Murali, S. Samuel, M. Kumar, S. Vaishak, S. Dasgupta, M. S. Kochunni, S. K. Armin Hafner Widell, K. N. |
ICAR Data Use Licennce: | http://krishi.icar.gov.in/PDF/ICAR_Data_Use_Licence.pdf |
Author's Affiliated institute: | ICAR::Central Institute of Fisheries Technology Centre for Water Resources Development and Management School of Energy Science and Engineering, Indian Institute of Technology Birla Institute of Technology and Science, Pilani Norwegian University of Science and Technology Fisheries and New Biomarine Industry, SINTEF Ocean AS |
Published/ Complete Date: | 2024-02-28 |
Project Code: | Not Available |
Keywords: | Ammonia (R717) Carbon dioxide (R744) Cascade refrigeration Defrosting Blast freezer |
Publisher: | Society of Refrigeration and Air Conditioning Engineers |
Citation: | Arun, B. S., George Ninan, Murali, S., Samuel, M., Kumar, S., Vaishak, S., Dasgupta, M. S., Kochunni, S. K., Armin Hafner and Widell, K. N. (2024) Study on various hot-gas defrosting configurations for CO2-NH3 cascade deep freezer. Int. J. Air-Conditioning and Refrigeration, 32(6):1-17. |
Series/Report no.: | Not Available; |
Abstract/Description: | Four hot-gas bypass defrosting confgurations for CO2-NH3 cascade blast freezer for application in fsh processing frm are numerically investigated. Due to the high moisture content of fsh, defrosting is necessary after every 4 to 5 h of batch operation. A thermodynamic model for the cascade system and defrosting was developed to study various defrosting confgurations formulated by rearranging the existing compressor to operate as a defrosting compressor and with the addition of an external defrosting compressor. From the simulation fndings, it can be summarized that the conventional hot-gas bypass defrosting without defrost compressor is suitable for a high-capacity cascade refrigeration system with more than three evaporators. For low cooling capacity refrigeration systems, a defrosting compressor is necessary to elevate the temperature above the cascade condensing temperature. A dedicated defrosting compressor with a power consumption of 3.1 kW and a modifed refrigeration/defrosting compressor with a power consumption of 6.8 kW can deliver 33.3 kW of heating at a temperature of +10 °C (45 bar). Incorporating a desuperheater between the main and defrosting compressors reduces compressor temperature and maintains the lubricating oil stability, without change in defrosting energy consumption and less exergy loss. The defrosting efciency is obtained in the range of 39.7–42% which is in agreement with published literature. |
Description: | Not Available |
ISSN: | 2010-1333 |
Type(s) of content: | Research Paper |
Sponsors: | Not Available |
Language: | English |
Name of Journal: | International Journal of Air-Conditioning and Refrigeration |
Journal Type: | International |
NAAS Rating: | 0 |
Impact Factor: | 1.0 |
Volume No.: | 32(6) |
Page Number: | 17 |
Name of the Division/Regional Station: | Not Available |
Source, DOI or any other URL: | https://doi.org/10.1007/s44189-024-00049-9 |
URI: | http://krishi.icar.gov.in/jspui/handle/123456789/82849 |
Appears in Collections: | FS-CIFT-Publication |
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