Analytical model for an overdriven free-displacer thermocompressor

Fischer, Fabian; Kuehl, Hans-Detlev

doi:10.1016/j.applthermaleng.2020.116251

Cited by 5 publications

(25 citation statements)

References 28 publications

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“…Unlike the Stirling cycle, the cycle of the thermocompressor is an open cycle, since it conveys mass and the system gas mass changes periodically. Therefore, check valves (5,6) are needed, which are located in the cold working space, as well as the displacer rod (4) [12]. 9…”

Section: Analytical Cycle Analysismentioning

confidence: 99%

“…1. Layout of a thermocompressor: (1) displacer, (2) hot working space, (3) cold working space, (4) displacer rod, (5) inlet valve, (6) outlet valve, (7) heater, (8) regenerator, (9) cooler [12].…”

Section: Analytical Cycle Analysismentioning

confidence: 99%

“…Throughout process 1-2, the piston moves from the upper end of stroke downwards. As both valves are closed, the system gas mass is constant and the pressure rises, because gas is displaced from the cold to the hot working space, taking up heat in the regenerator [12].…”

Section: Analytical Cycle Analysismentioning

confidence: 99%

“…In state 2, the system pressure reaches the outlet pressure, so that the outlet valve opens. Instead of a further pressure increase, mass is discharged, so that the system gas mass decreases and the ideal process 2-3 is isobaric [12].…”

Section: Analytical Cycle Analysismentioning

confidence: 99%

“…Therefore, a cascaded arrangement of several stages is required [10 -12]. In the past, there have been various approaches to analytically describe, simulate, construct and test such machines, which have been reviewed by Fischer and Kühl [12]. The project currently in progress at the Chair of Thermodynamics of TU Dortmund University aims at investigating the possibility of generating compressed air from waste heat by means of a cascade of identical thermocompressor stages.…”

Section: Introductionmentioning

confidence: 99%

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Generation of compressed air by cascaded thermocompressors – project status

Fischer

Kühl

2021

E3S Web Conf.

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Compressed air is one of the most widely used industrial energy sources, and its production by mechanical compressors is extremely expensive and, in addition, inefficient. Therefore, the utilization of waste heat, which accrues on a large scale in many industrial applications, by means of a thermocompressor is an obvious alternative. This contribution presents a design approach to experimentally investigate a reciprocating thermocompressor with a self-actuated overdriven free displacer. These experiments shall be the basis for the design and realization of a cascade of identical stages, which has so far only been investigated by means of analytical modelling and theoretical similarity considerations. The main advantage of this approach is its extreme constructive simplicity and the expected self-regulating effect, which both facilitate a cost-effective production and operation. As the minimization of dead volume and fluid friction losses is essential, the heat exchangers and the regenerator are plainly realized by an annular gap around the displacer in the proposed design, thus further increasing its simplicity. The design parameters are determined by an optimization based on an analytical model extended by various losses and heat transfer limitations.

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Section: Analytical Cycle Analysismentioning

confidence: 99%

Section: Analytical Cycle Analysismentioning

confidence: 99%

Section: Analytical Cycle Analysismentioning

confidence: 99%

Section: Analytical Cycle Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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