Modeling and analysis of a novel rotary compressor

Miguel E Jovane, Purdue University

Abstract

A novel rotary compressor has been developed by LG Electronics. This novel compressor, termed the z-compressor, performs very well in terms of noise and vibration but not in terms of energy consumption. The compressor uses refrigerant R-410A as the working fluid. In order to study in detail the performance of the compressor from an energy point of view, a model has been developed. The model accounts for internal leakages, frictional losses, heat transfer, and motor losses. The model has been validated by comparing its results with experimentally obtained results. The mass flow rate and power input of the compressor are predicted within 7%. The discharge temperature is predicted within 5°C. The model was used to identify and analyze internal losses within the compressor. Four leakage paths that are associated with the same clearance account for approximately 55% of the total leakage losses. 35% of the total leakage losses occur in two paths that are associated with another component of the compressor. 60% to 70% of frictional losses are associated with the same two components. In terms of efficiencies, for suction pressures between 600 kPa and 1 MPa and for pressure ratios between 2.0 and 3.4, the volumetric efficiency of the z-compressor ranges between 0.84 and 0.89, while the isentropic efficiency ranges between 0.53 and 0.59. By changing dimensions that addressed one of the main contacts of leakage and frictional losses, the volumetric efficiency was improved more than 4.5% while the isentropic efficiency was increased by 6%. Through further analysis it has been projected that the volumetric efficiency can be improved at least by another 4%.

Degree

Ph.D.

Advisors

Groll, Purdue University.

Subject Area

Mechanical engineering

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