Theoretical analysis of dynamic characteristics in linear compressors

Abstract Linear compressor technology is characterized by the absence of a crank mechanism, which has gained increasing attention in vapor compression systems due to its compactness and lower friction losses in comparison to conventional reciprocating compressors. Limited work was found in the open literature related to the development and in-depth validation of a comprehensive linear compressor dynamic model that couples thermodynamic aspects with both mechanical and electrical sub-models. This paper presents a comprehensive and generalized simulation model that is used to simulate the dynamic performance of a linear compressor. The model is based on mass and energy balance equations applied to open control volumes. The overall model is composed of several sub-models including the piston dynamics, electrical motor, valve dynamics, and leakage flows. The thermodynamic model and the sub-models are integrated into a compressor overall energy balance that describes the different heat flows and losses. The linear compressor model is able to predict both transient and steady-state behaviors of the piston movement, internal pressure and temperatures as well as the overall performance. Comparisons of predicted and measured mass flow rates as a function of operating frequency are also presented within this work.

[1]  Chul-Gi Roh,et al.  An experimental and numerical study on dynamic characteristic of linear compressor in refrigeration system , 2009 .

[2]  Werner Soedel,et al.  On the resonance and operational behavior of an oscillating electrodynamic compressor , 1979 .

[3]  Richard J Goldstein,et al.  An Experimental Study of Natural Convection Heat Transfer in Concentric and Eccentric Horizontal Cylindrical Annuli , 1978 .

[4]  Lei Zhang,et al.  Dynamic and thermodynamic characteristics of the moving-coil linear compressor for the pulse tube cryocooler: Part B – Experimental verifications , 2016 .

[5]  Vincent Lemort,et al.  PDSim: A general quasi-steady modeling approach for positive displacement compressors and expanders , 2020 .

[6]  Jiabin Wang,et al.  Design Optimization of Short-Stroke Single-Phase Tubular Permanent-Magnet Motor for Refrigeration Applications , 2010, IEEE Transactions on Industrial Electronics.

[7]  Andras Z. Szeri,et al.  Fluid Film Lubrication , 2010 .

[8]  J. Greenwood,et al.  The Contact of Two Nominally Flat Rough Surfaces , 1970 .

[9]  Ming Xia,et al.  Analysis of resonant frequency of moving magnet linear compressor of Stirling cryocooler. , 2010 .

[10]  C. Minas.  Nonlinear Dynamics of an Oilless Linear Drive Reciprocating Compressor , 1994 .

[11]  E. B. Qvale,et al.  Instantaneous Heat Transfer to the Cylinder Wall in Reciprocating Compressors , 1972 .

[12]  Xiao Jiang,et al.  Study on the stroke amplitude of the linear compressor , 2018 .

[13]  Richard Stone,et al.  Cooling microprocessors using vapor compression refrigeration , 2010, 2010 12th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems.

[14]  Lars Norum,et al.  Oscillatory motion application of tubular linear permanent magnet machine , 2009, 2009 35th Annual Conference of IEEE Industrial Electronics.

[15]  R. Stone,et al.  The effect of clearance control on the performance of an oil-free linear refrigeration compressor and a comparison between using a bleed flow and a DC current bias , 2016 .

[16]  N. R. Van der Walt,et al.  The Simulation and Design of a High Efficiency, Lubricant Free, Linear Compressor for a Domestic Refrigerator , 1992 .

[17]  James E. Braun,et al.  PDSim: Demonstrating the capabilities of an open-source simulation framework for positive displacement compressors and expanders , 2020 .

[18]  Werner Soedel,et al.  Fluid Dynamic Effects in the Multicylinder Compressor Suction and Discharge Cavities , 1976 .

[19]  Haizheng Dang,et al.  Dynamic and thermodynamic characteristics of the moving-coil linear compressor for the pulse tube cryocooler. Part A: Theoretical analyses and modeling , 2016 .

[20]  P. Lettieri,et al.  An introduction to heat transfer , 2007 .

[21]  Vincent Lemort,et al.  Development of a generalized steady-state simulation framework for positive displacement compressors and expanders , 2013 .

[22]  D Ziviani,et al.  A numerical study on dynamic characteristics of linear compressor for electronics cooling. , 2017 .

[23]  R. V. Cadman,et al.  Electrodynamic Oscillating Compressors: Part 2—Evaluation of Specific Designs for Gas Loads , 1969 .

[24]  Eckhard A. Groll,et al.  Dynamic Modeling of a Poppet Valve for use in a Rotating Spool Compressor , 2016 .

[25]  Kun Liang,et al.  A novel linear electromagnetic-drive oil-free refrigeration compressor , 2014 .

[26]  Vincent Lemort,et al.  Pure and Pseudo-pure Fluid Thermophysical Property Evaluation and the Open-Source Thermophysical Property Library CoolProp , 2014, Industrial & engineering chemistry research.