Development of capacity modulation compressor based on a two stage rotary compressor – part I: Modeling and simulation of compressor performance

2015 ◽  
Vol 54 ◽  
pp. 22-37 ◽  
Author(s):  
Seung-jun Lee ◽  
Jaesool Shim ◽  
Kyung Chun Kim
Keyword(s):  
Modeling And Simulation ◽  
Rotary Compressor ◽  
Two Stage ◽  
Compressor Performance ◽  
Capacity Modulation

A Design Model of a New Positive Displacement Rotary Compressor Based on Trochoidal Geometry for High Pressure Applications

2005 ◽  
Author(s):  
Ahmed Abdelwahab
Keyword(s):  
Gas Flow ◽  
Thermodynamic Cycle ◽  
Experimental Results ◽  
Design Model ◽  
Rotary Compressor ◽  
Mechanical Reliability ◽  
High Discharge ◽  
Positive Displacement ◽  
Performance Trends ◽  
Compressor Performance

The desire to achieve high discharge pressures at low manufacturing and maintenance costs has resulted in the development of a number of new positive displacement rotary compressor designs. The proposed design involves a compressor with a trochoidal casing geometry and a rotor orbiting the casing interior. This arrangement generates a varying trapped volume between the rotor and the casing thus providing the necessary compression for the compressor. The major advantage of this design is its inherent simple two-dimensional configuration which makes it a very cheap device to manufacture. Furthermore, the oil-flooded lubrication system used with this design not only acts as a lubricant but also as a coolant to the main gas flow and consequently improves the mechanical reliability of the compressor. This paper presents a complete design model developed to investigate the performance of the compressor. The geometrical, kinematic, and dynamic equations of the casing and rotor are derived. A model of the compressor thermodynamic cycle and gasdynamic performance is presented. A comparison between the developed model and the experimental results of a prototype compressor testing is presented. The comparison shows that the developed model indeed captures the compressor performance trends with considerable accuracy at the design conditions. Deviation between the model and experimental results at the off design conditions is due to inaccuracies in the inlet and exit port loss models at the off design conditions.

Modeling of a Two-Stage Rotary Compressor

2008 ◽  
Vol 14 (5) ◽  
pp. 719-748 ◽  
Author(s):  
Margaret Mathison ◽  
James Braun ◽  
Eckhard Groll
Keyword(s):  
Rotary Compressor ◽  
Two Stage

A CFD Analysis of the Effects of Two-Phase Flow in a Two-Stage Centrifugal Compressor

2015 ◽  
Author(s):  
Chaitanya V. Halbe ◽  
Walter F. O’Brien ◽  
William T. Cousins ◽  
Vishnu Sishtla
Keyword(s):  
Centrifugal Compressor ◽  
Two Phase Flow ◽  
Pressure Ratio ◽  
Three Dimensional ◽  
Power Input ◽  
Phase Flow ◽  
Two Stage ◽  
Two Phase ◽  
Droplet Dynamics ◽  
Compressor Performance

The performance of a compressor is known to be affected by the ingestion of liquid droplets. Heat, mass and momentum transfer as well as the droplet dynamics are some of the important mechanisms that govern the two-phase flow. This paper presents numerical investigations of three-dimensional two-phase flow in a two-stage centrifugal compressor, incorporating the effects of the above mentioned mechanisms. The results of the two-phase flow simulations are compared with the simulation involving only the gaseous phase. The implications for the compressor performance, viz. the pressure ratio, the power input and the efficiency are discussed. The role played by the droplet-wall interactions on the rate of vaporization, and on the compressor performance is also highlighted.

scholarly journals Y. S. Hu, H. J. Wei, B. Yu, O. X. Yang, J. Wang, J. Wu. Research on the vapor injection of two-stage rotary compressor / trans. from Engl. M. A. Fedorova

2021 ◽  
Vol 5 (4) ◽  
pp. 65-74
Author(s):  
M. A. Fedorova ◽  
Keyword(s):  
Flow Characteristics ◽  
Mass Conservation ◽  
Conservation Equation ◽  
Rotary Compressor ◽  
Two Stage ◽  
Injection Channel ◽  
Injection Flow ◽  
Vapor Injection ◽  
Intermediate Chamber ◽  
Mass Conservation Equation

In order to understand the vapor injection flow characteristics of two-stage rotary compressor in the course of compression, a mathematical model based on mass conservation equation, energy equation and thermodynamic identity was established and proved by P-V diagram testing results. Some useful conclusions about pressure in the intermediate chamber and mass flow of vapor injection in the course of compression were also given out. The results show that, gas backflow between the intermediate chamber and the vapor injection channel is an important defection of two-stage rotary compressor which can be solved by the application of injection valve in vapor injection channel. The injection valve can obviously reduce the gas backflow and the power loss in the course of compression while increasing the pressure fluctuation in the intermediate chamber. Experiments show that the COP of two-stage rotary compressor with the injection valve increased by over 2% in ASHRAE/T working condition.

scholarly journals Research on the Vapor Injection of Two-stage Rotary Compressor

2019 ◽  
Vol 604 ◽  
pp. 012072
Author(s):  
Y S Hu ◽  
H J Wei ◽  
B Yu ◽  
O X Yang ◽  
J Wang ◽  
...  
Keyword(s):  
Rotary Compressor ◽  
Two Stage ◽  
Vapor Injection
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