Turbomachinery Advisor with Petrobras E&P Business Unit, in Rio de Janeiro, Brazil. He has been in the oil and gas industry for 28 years. Mr. Miranda is responsible for the technical support to existing machinery operations, as well as for conceptual design, specification, selection, and shop test acceptance of turbomachinery. His background includes comprehensive evaluation of energy and compr...

Dynamic models of vapor compression systems are important tools for HVAC engineers in the development and evaluation feedback control and fault detection and diagnostic (FDD) algorithms. Significant literature exists on dynamic models of vapor compression systems. Much of it is restricted to air-to-air systems and few papers deal with liquid chillers. Most of existing liquid chiller models revi...

Abstract The centrifugal compressor is an important machine in the oil and gas industry, so fault prediction of these machines widely discussed literature. Several techniques can should be used compressors: vibration analysis, non-destructive testing techniques, operating parameters, other techniques. But particular cases, tools are inefficient for making a decision regarding combined diagnosis...

This paper introduces a way of reducing the torque variation in scroll compressors. In a scroll compressor where radial compliance device such as the slider bush is used for the flank sealing, the orbiting scroll member is given the freedom of movement in the radial direction. When such an orbiting scroll member orbits around the nonorbiting scroll member whose center is offset from that of the...

Spatiotemporal evolution and fluctuation characteristics of a centrifugal compressor are investigated by numerical simulation under near-stall conditions with high mass-flow rate. The large-eddy (LES) for unsteady computations is implemented in the flow. internal flow physical mechanism presented at rate (1.1 Qn) low (0.8 Qn, near-stall). spatiotemporal velocity streamline demonstrates that lot...

Centrifugal compressors are widely used in many industrial fields such as automotive, aviation, aerospace. However, these turbomachines suffer instability phenomenon when the flow rate is too high or low, called rotating stall and surge. These phenomena cause operation failure, pressure fluctuations vibrations of thorough system. Numerous mechanical solutions have been presented to minimize ins...