Cycle-Based Vapor Cycle System Control and Active Charge Management for Dynamic Airborne Applications

Emo, Stephen; Ervin, Jamie S.; Michalak, Travis E.; Tsao, Victor

doi:10.4271/2014-01-2224

Cited by 13 publications

(9 citation statements)

References 5 publications

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“…In Ref. [195], it was shown that the active charge management system proposed provided efficiency, accuracy, and operability benefits, but would add weight and complexity. In Ref.…”

Section: Refrigeration Cyclesmentioning

confidence: 99%

Aircraft thermal management: Practices, technology, system architectures, future challenges, and opportunities

Heerden

Judt

Jafari

et al. 2022

Progress in Aerospace Sciences

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“…In Ref. [195], it was shown that the active charge management system proposed provided efficiency, accuracy, and operability benefits, but would add weight and complexity. In Ref.…”

Section: Refrigeration Cyclesmentioning

confidence: 99%

Aircraft thermal management: Practices, technology, system architectures, future challenges, and opportunities

Heerden

Judt

Jafari

et al. 2022

Progress in Aerospace Sciences

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“…1 may be preferred in order to reduce the weight and/or size of the VCS by not including an accumulator. Such applications include next-generation aircraft, for which VCSs have been investigated as a lighter, less expensive, and more efficient alternative to air-cycle systems for thermal energy management [2].…”

Section: Fig 1 Schematic Of a Basic Vapor Compression Systemmentioning

confidence: 99%

“…This provides a key capability to applications in which extended durations of compressor liquid ingestion are undesirable, but preventing against liquid ingestion by adding an accumulator to the system is not preferred due to the weight and/or size of this additional hardware. Such applications may include next generation aircraft, for which performance and power density requirements on the thermal management systems have resulted in recent investigations into replacing traditional air-cycle systems with VCSs [2].…”

Section: Experimental Validation and Comparison To Simulationmentioning

confidence: 99%

Switched linear control for refrigerant superheat recovery in vapor compression systems

Pangborn

Alleyne

2016

Control Engineering Practice

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Extended durations of liquid refrigerant ingestion by the compressor of a vapor compression system (VCS) can lead to damage or failure of this component. While this can be prevented by inserting an accumulator between the evaporator and compressor, this addition of hardware may be undesirable for applications in which the weight or size of the thermal management system is critical. As an alternative, this paper proposes a switched Linear Quadratic Gaussian (LQG) design to quickly recover the presence of a superheated phase at the exit of the evaporator using feedback control. Stability analysis of the closed-loop switched system is presented, and application of the control approach in both simulation and on an experimental VCS testbed demonstrate the success of the control design.

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“…They do not require a source of high-pressure air from engine bleed air or conventional ram air for operation, for example [2][3][4][5]. The working fluid in VCS undergoes a phase change and therefore VCS have higher transfer rates than non-phase changing cooling systems making them more efficient in weight and volume [6][7][8][9][10][11][12]. Another benefit of VCS is that two-phase systems use the latent heat of vaporization of the working fluid for heat dissipation and rejection, unlike a single-phase system that uses sensible heat [7,13].…”

Section: Introductionmentioning

confidence: 99%

Parameter Tuning of a Vapor Cycle System for a Surveillance Aircraft

Drego,

Andersson,

Staack

2024

Aerospace

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Surveillance aircraft perform long-duration missions (>eight hours) that include detection and identification of objects on the ground, the water, or in the air. They have surveillance systems that require large amounts of cooling power (typically 10 s of kW) for long durations. For aircraft application, vapor cycle systems (VCS) are emerging as a more efficient alternative to conventional cooling systems. In this study, a two-part method was applied to a cooling system with a VCS that can be installed on a surveillance aircraft. The first part focused on a parameter tuning study set-up and demonstrated how after identifying the operating conditions, constraints, and requirements, the only cooling system parameter available for tuning was the VCS compressor speed. The second part focused on a modelling and solving strategy for the cooling system and showed how the capacity of an aircraft cooling system was impacted by tuning the VCS compressor speed (Hz) for a surveillance system heat flow rate from 10 kW to 70 kW. The results from this study can be used to design a control strategy for the compressor. In a broader perspective, the two-part method and the results analysis presented can serve as a preliminary method for aircraft VCS control optimization studies.

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Cycle-Based Vapor Cycle System Control and Active Charge Management for Dynamic Airborne Applications

Cited by 13 publications

References 5 publications

Aircraft thermal management: Practices, technology, system architectures, future challenges, and opportunities

Aircraft thermal management: Practices, technology, system architectures, future challenges, and opportunities

Switched linear control for refrigerant superheat recovery in vapor compression systems

Parameter Tuning of a Vapor Cycle System for a Surveillance Aircraft

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