Electrodynamic Oscillating Compressors: Part 2—Evaluation of Specific Designs for Gas Loads

Cadman, R. V.; Cohen, R.

doi:10.1115/1.3571207

Cited by 10 publications

(3 citation statements)

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“…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

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Both the resonant frequency and stroke are sensitive to changes in geometry and operating conditions (Cadman & Cohen, 1969;Park et al, 2004;Pollak et al, 1979;Unger & Novotny, 2002). This poses a challenge not only to compressor design but also to modeling efforts.…”

Section: Bdcmentioning

confidence: 99%

“…These two degrees of freedom are the desired piston translation and the undesired rotation of the piston within the cylinder. However, it has been observed that the resonant frequency of the linear compressor is predicted accurately using a one degree of freedom approach (Pollak et al, 1979;Cadman & Cohen, 1969). In addition, Equations (1)- (7) are linearized based on the desired input stroke.…”

Section: Resonant Frequency Of a Linear Compressormentioning

confidence: 99%

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

Bradshaw¹,

Groll²,

Garimella³

2013

International Journal of Refrigeration

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A comprehensive model of a linear compressor for electronics cooling was previously presented by Bradshaw et al. (2011). The current study expands upon this work by first developing methods for predicting the resonant frequency of a linear compressor and for controlling its piston stroke. Key parameters governing compressor performance -leakage gap, eccentricity, and piston geometry -are explored using a sensitivity analysis. It is demonstrated that for optimum performance, the leakage gap and frictional parameters should be minimized.In addition, the ratio of piston stroke to diameter should not exceed a value of one to minimize friction and leakage losses, but should be large enough to preclude the need for an oversized motor. An improved linear compressor design is proposed for an electronics cooling application,

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