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Semi-empirical modelling of small size radial turbines for refrigeration purposes.

Author(s) : MARTINS G., MENDONZA O. S. H., TUMIALAN J. A.

Summary

Use of small size turbochargers in refrigeration (Joule/Brayton cycles), as those used by utility vehicles, requires real modelling of their behaviour. This work uses the axial flow turbine model proposed by the document ASHRAE TC 4.7, applying it to a Brazilian turbocharger. The model proposed by ASHRAE requires identification of several parameters as: incidence flow angle, impeller diameter, exit throttle area. The ASHRAE model was tested using real behavior curves, given by Brazilian manufactures. Our work shows that the identified parameters can not be constants when the ASHRAE model is applied to small radial turbines, and also our works show that the throttle area can not be identify using just a shock condition; it needs a mach number correction to represent with veracity the real behavior. The authors are proposing a new methodology to identify parameters that improves and gives good results for the HVAC component. The results obtained and physical explanations are offered for the new parameter identification methodology presented in this paper.

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Details

  • Original title: Semi-empirical modelling of small size radial turbines for refrigeration purposes.
  • Record ID : 2007-1816
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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