In mobile devices such as aircraft and electric vehicles, due to limited space, there are strict requirements on the volume weight of compressor mounted vehicle. Therefore, high-speed scroll compressors have attracted more attention because their small size light weight. this paper, numerical calculations analysis three-dimensional (3D) transient flows in a refrigeration were established valida...

To control the temperature of electric motor, suction gas is introduced flowing through motor in hermetic scroll compressors. For high-speed compressors, this flow resistance high, which results decreasing efficiency. In paper, spiral channels were designed inside rotor to decrease and increase refrigerant rate compressor. Simulation was carried out. Two structure straight intake brought into s...

Motivated by the high speed of real-time data acquisition, computational power, and low cost of generic PCs and embedded-PCs running Linux, this thesis addresses new methods and approaches to fault detection, model identification, and control. Fault detection. A series of faults was introduced into a 3-Ton roof-top airconditioning unit (RTU). Supply and condenser fan imbalance were detected by ...

For a hermetic reciprocating compressor of the household refrigerator, it is not economic to set a separate oil pump, because of cost and space demands. Its oil supply system is mainly promoted by a reed pump and the spiral groove on the shaft. When the compressor is operating, the oil climbs up the inner wall of the reed pump because of the centrifugal force. The height to which the oil could ...

Selection of each major type of Reciprocating, Rotary, Centrifugal and axial Compressor is briefly reviewed. It ls explained how the nondimensional scales of Specific Speed and Speclfic Diameter can be used to select any of the above configuration of Compression machinery at its optimum efficiency range. The paper presents the approach of Engineers Constructors in selecting compressors in petro...

This thesis addresses modeling and active surge control of a simple compression system, using only the drive system of the compressor for actuation. Theoretical results are validated by experiments on a test rig that was built as a part of this work. Control laws are derived in two stages. First all system states, such as pressure mass ‡ow and impeller speed, are assumed as available signals. A...

In this paper, the experimental vibration analysis of a single cylinder air compressor based on a hypocycloid straight line mechanism (HSM) is investigated. The HSM mechanism uses planetary gears to convert rotational motion to purely linear motion. In the conventional air compressor, the slider- crank mechanism is replaced by the HSM mechanism with appropriate counterweights. The constructed s...

For a 120kW hydrogen fuel cell system, centrifugal air compressor with fixed power of 22kW is designed. Firstly, the theoretical calculation carried out for aerodynamic characteristics ultra-high-speed permanent magnet synchronous motor, an compressor, and foil bearing. Then, prototype trial-produced related test bench built verification. Finally, both simulation results indicate that designed ...