Summary
Feasibility of replacing oil-lubricated compressing equipment in CO2 based refrigeration systems with oil-free turbo-machinery is assessed. Presented concept enables efficient compression for systems ranging from 0.1 to 5 MW of cooling capacity, provided that the operating pressures are low, i.e. 30/10 bar. Performance of the systems with higher operating pressures, i.e. 77/30 bar is penalized in wide range of capacities due to the excessive windage losses, especially pronounced in the systems with cooling capacities lower than 1 MW. In some cases, possibility of using longer motor should be analyzed. This may require special strategies for rotordynamic issues or driving each impeller with separately mounted motor. It is observed that optimal specific speed of the compressor stage does not always result in optimal overall performance. The trade-off between aerodynamic efficiency and non-stage losses must be found.
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Details
- Original title: Oil free turbo-compressors for CO2 refrigeration applications.
- Record ID : 30008173
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 5
- Publication date: 2013/08
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Indexing
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Themes:
Compression systems;
Compressors - Keywords: Refrigerating system; Oil free compressor; Compressor; CO2
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Intensification of external cooling of lubricat...
- Author(s) : ÛCHA V. L., BUSAROV S. S.
- Date : 2006
- Languages : Russian
- Source: Kholodilnaya Tekhnika - n. 2
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Oil-free turbo-compressors for refrigeration ap...
- Author(s) : KUS B., NEKSÅ P.
- Date : 2012/06/25
- Languages : English
- Source: 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
- Formats : PDF
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Evaporative cooling system with natural refrige...
- Author(s) : BARROCA P., HAFNER A., PARDINAS A., VERLAAT B., ZWALINSKI L., HULEK W., PETAGNA P., HANF P., BATTISTIN M.
- Date : 2020/12/07
- Languages : English
- Source: 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2020). Proceedings. Kyoto, Japon, December 7-9th 2020.
- Formats : PDF
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Experimental investigation on the application o...
- Author(s) : SCHNOTALE J., MACZEK K., WOLEK M., WARCZAK W.
- Date : 1998
- Languages : Polish
- Source: Chlodnictwo - vol. 33 - n. 6
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Novel partial admission radial compressor for C...
- Author(s) : KUS B., NEKSÅ P.
- Date : 2013/12
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 8
- Formats : PDF
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