Based on damage data owned by PT XYZ, the compressor engine that has a history of high is D32 CP8 Compressor Engine. Critical components CP 8 are determined using risk matrix. The critical selected from Engine Screw Motor, Refrigerant Air Cooler, and Cylinder Bearing Oil Cooler. This study uses Reliability Centered Spares (RCS), Min-Max Stock, Reorder Point (ROP) methods. collection processing ...

The screw compressor in the early stage of development is generally known as the oil-injection type. However, escalating environmental problems and advances in electronic components have spurred continuous R & D to minimize the oil content in compressed air. The oil-free twin-screw compressor is continuously compressed by inner volumetric change between rotors and casing. Fo this reason, in ord...

The paper presents the study of a new compressor for household appliances, developed through a virtual simulation system, with Simulink and Adams software. Linear compressor has a linear motor coupled to a mechanical system: a piston and a spring. The advantage of this compressor respect to a standard reciprocating compressor is due to the high reduction of energy losses and variable capacity p...

This paper proposes efficient and optimal 4:2 and 5:2 compressors. The compressors are highly optimized in terms of transistor count. These designs have the principle advantage that in addition to reduced transition activity, they have no direct connections to the power-supply and is totally driven by the input signals, leading to a noticeable reduction in short-circuit power consumption. The p...

In recent years, several research activities have been conducted to develop knowledge in analysis, design and optimization of compressor anti-surge control system. Since the anti-surge control testing on a full-scale compressor is limited to possible consequences of failure, and also the experimental facility can be expensive to set up control strategies and logic, design process often involves...

A general procedure for the three dimensional analysis of a gas cavity by the concept of four pole parameters has been developed by Kim and Soedel [1]; the procedure was later extended by Lai and Soedel [2] to two dimensional analysis, which is more efficient in computation than the 3~D analysis method and can solve some geometries which are difficult to solve by the 3-D method. In this study, ...

To evaluate the effects of the thermal properties of components on the overall temperature distribution of a compressor, a heat transfer model employing the lumped thermal conductance approach has been formulated. The model has been verified with extensive measurements and the overall discrepancy of less than 7% is obtained. The discrepancies in the prediction are mainly the results of assumpti...

BACKGROUND Blow-by, a common form of nebulizer therapy, in which the device is held away from a child's face, has been dismissed as ineffective because studies have demonstrated incremental aerosol drop-off with increasing distances from the face. Many of these studies do not take into account differences among nebulizer systems. Using common, commercially available nebulizer systems, we define...

design models of multi- stage, axial flow compressor are developed for gas turbine engines. axial flow compressor is one of the most important parts of gas turbine units. therefore, its design and performance prediction are very important. one-dimensional modeling is a simple, fast and accurate method for performance prediction of any type of compressors with different geometries. in this appro...