Summary
In the semi-hermetic screw refrigeration compressor, the motor is mostly cooled down by suction refrigerant before it flows into the compressor suction port. To investigate cooling effects of the motor and performance of the compressor under part-load conditions, a lumped parameter model describing heat-transfer characteristics inside the motor and a part-load model of screw refrigeration compressor are developed and validated. Heating effects at compressor suction end and heat conduction from the male rotor screw to the motor shaft are taken into account. Nodes representing refrigerant inside the motor cooling passages are modeled separately. Temperature rise of refrigerant through the motor increases when the compressor load drops by either suction volume variation or speed variation. With drop of the compressor load, stator winding temperature goes up in the case of suction volume variation by slide valve motion, but it lowers in the case of speed variation by frequency conversion.
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Details
- Original title: Thermal modeling for the motor in semi-hermetic screw refrigeration compressors under part-load conditions.
- Record ID : 30009779
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 7
- Publication date: 2013/11
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Indexing
- Themes: Compressors
- Keywords: Semihermetic compressor; Cooling; Performance; Electric motor; Model; Part load; Screw compressor
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Thermal modeling for the motor in semi-hermetic...
- Author(s) : CHEN W., SHEN J., HE Z., et al.
- Date : 2012/07/16
- Languages : English
- Source: 2012 Purdue Conferences. 21st International Compressor Engineering Conference at Purdue.
- Formats : PDF
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Research of thermal dynamic characteristics for...
- Author(s) : WANG Z., WANG J., JIANG W., et al.
- Date : 2017/01/05
- Languages : English
- Source: Applied Thermal Engineering - vol. 110
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Thermal and hydraulic analysis on the flow arou...
- Author(s) : HE Z. H., XING Z. W., CHEN W., et al.
- Date : 2013/01
- Languages : English
- Source: Applied Thermal Engineering - vol. 50 - n. 1
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New generation CS.3 compact screw compressors: ...
- Author(s) : GROSSE-KRACHT R.
- Date : 2011/06/10
- Languages : English
- Source: Green new deal - green economy. The latest technology in refrigeration and air conditioning: energy issues and climate change, new refrigerants, new European regulations, new plants. XIV European Conference: June 10-11, 2011, Milan.
- Formats : PDF
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La nuova generazione di compressori a vite comp...
- Author(s) : GROSSE-KRACHT R.
- Date : 2011/06/10
- Languages : Italian
- Source: Green new deal - green economy. The latest technology in refrigeration and air conditioning: energy issues and climate change, new refrigerants, new European regulations, new plants. XIV European Conference: June 10-11, 2011, Milan.
- Formats : PDF
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