Electrodynamic Oscillating Compressors: Part 1—Design Based on Linearized Loads

Cadman, R. V.; Cohen, R.

doi:10.1115/1.3571206

Cited by 18 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is similar to the approach adopted by Cadman and Cohen (1969a); however, in the current work k gas is updated as the guessed value of x p changes.…”

Section: Vibration Modelmentioning

confidence: 99%

A comprehensive model of a miniature-scale linear compressor for electronics cooling

Bradshaw

Groll

Garimella

2011

International Journal of Refrigeration

View full text Add to dashboard Cite

A comprehensive model of a miniature-scale linear compressor for electronics cooling is presented. Linear compressors are appealing for refrigeration applications in electronics cooling. A small number of moving components translates to less theoretical frictional losses and the possibility that this technology could scale to smaller physical sizes better than conventional compressors. The model developed here incorporates all of the major components of the linear compressor including dynamics associated with the piston motion. The results of the compressor model were validated using experimental data from a prototype linear compressor. The prototype compressor has an overall displacement of approximately 3cm3 , an average stroke of 0.6 cm. The prototype compressor was custom built for this work and utilizes custom parts with the exception of the mechanical springs and the linear motor. The model results showed good agreement when validated against the experimental results. The piston stroke is predicted within 1.3% MAE. The volumetric and overall isentropic efficiencies are predicted within 24% and 31%, MAE respectively.

show abstract

“…This is similar to the approach adopted by Cadman and Cohen (1969a); however, in the current work k gas is updated as the guessed value of x p changes.…”

Section: Vibration Modelmentioning

confidence: 99%

A comprehensive model of a miniature-scale linear compressor for electronics cooling

Bradshaw

Groll

Garimella

2011

International Journal of Refrigeration

View full text Add to dashboard Cite

show abstract

“…These configurations have been investigated for compressor applications and compared for power efficiency at different stroke positions [17]. Similar work has been conducted for the different linear compressor types in which the effect of the compressed gas on the piston has been expressed by an equivalent damping coefficient and a gas-spring stiffness [18][19][20][21][22]. Furthermore, Chen et al studied the static and dynamic performance of moving magnet linear compressors to identify the optimal points of the linear compressor [23].…”

Section: Introductionmentioning

confidence: 99%

Multi-Fidelity Design Optimisation of a Solenoid-Driven Linear Compressor

et al. 2020

View full text Add to dashboard Cite

Improved management and impermeability of refrigerants is a leading solution to reverse global warming. Therefore, crank-driven reciprocating refrigerator compressors are gradually replaced by more efficient, oil-free and hermetic linear compressors. However, the design and operation of an electromagnetic actuator, fitted on the compression requirements of a reciprocating linear compressor, received limited attention. Current research mainly focuses on the optimisation of short stroke linear compressors, while long stroke compressors benefit from higher isentropic and volumetric efficiencies. Moreover, designing such a system focuses mainly on the trade-off between number of copper windings and the current required, due to the large computational cost of performing a full geometric design optimisation based on a Finite Element Method. Therefore, in this paper, a computationally-efficient, multi-objective design optimisation for six geometric design parameters has been applied on a solenoid driven linear compressor with a stroke of 44.2 mm. The proposed multi-fidelity optimisation approach takes advantage of established models for actuator optimisation in mechatronic applications, combined with analytical equations established for a solenoid actuator to increase the overall computational efficiency. This paper consists of the multi-fidelity optimisation algorithm, the analytic model and Finite Element Method of a solenoid and the optimised designs obtained for optimised power and copper volume, which dominates the actuator cost. The optimisation results illustrate a trade-off between minimising the peak power and minimising the volume of copper windings. Considering this trade-off, an intermediate design is highlighted, which requires 33.3% less power, at the expense of an increased copper volume by 5.3% as opposed to the design achieving the minimum copper volume. Despite that the effect of the number of windings on the input current remains a dominant design characteristic, adapting the geometric parameters reduces the actuator power requirements significantly as well. Finally, the multi-fidelity optimisation algorithm achieves a 74% reduction in computational cost as opposed to an entire Finite Element Method optimisation. Future work focuses on a similar optimisation approach for a permanent magnet linear actuator.

show abstract

“…Cadman and Cohen et al. 2 proposed a simulation model with the purpose of assessing the performance of possible designs of electrodynamic oscillating gas compressors featuring a linear spring-damper load over the expected range of operating conditions. After almost a decade, one mathematical model of a single oscillating compressor was developed by Pollak et al., 3 a cyclic system was used to treat losses as integration over the cycle and consider all forces on the coil-piston combination.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of gas bearings in oil-free linear compressors

Zhang

Ziviani

Braun

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

Recently, linear compressor technology has gained increased attention in vapor compression systems due to its compactness and lower frictional losses compared with the conventional reciprocating compressors. Since the absence of the crank-mechanism eliminates the rotation and reduces the side loads on the piston centered inside the cylinder, it is possible to operate the linear compressors without oil lubrication. A number of advantages can be obtained in terms of the refrigerant compatibility, operation conditions and the system cost. In order to enable oil-free operation, while minimizing frictional losses and leakage flow between the piston and the cylinder wall, a gas bearing approach is applied. Little work was found in the open literature related to the numerical analysis of gas bearings coupled with a comprehensive dynamic linear compressor model. This paper presents a 1-D gas bearing model based on a Finite Volume Method (FVM) applied to a linear compressor. The dynamic characteristics of the gas bearings on the gas film pressure field are analyzed using the model. When integrated together with a comprehensive dynamic linear compressor model, it is possible to predict leakage and frictional losses within the compressor as well as the overall performance.

show abstract

Electrodynamic Oscillating Compressors: Part 1—Design Based on Linearized Loads

Cited by 18 publications

References 0 publications

A comprehensive model of a miniature-scale linear compressor for electronics cooling

A comprehensive model of a miniature-scale linear compressor for electronics cooling

Multi-Fidelity Design Optimisation of a Solenoid-Driven Linear Compressor

Numerical analysis of gas bearings in oil-free linear compressors

Contact Info

Product

Resources

About