On the Dynamic Robustness of a Non-Endoreversible Engine Working in Different Operation Regimes

Sánchez-Salas, N.; Chimal-Eguía, Juan Carlos; Guzmán-Aguilar, F.

doi:10.3390/e13020422

Cited by 9 publications

(7 citation statements)

References 31 publications

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“…Moreover, some authors [ 25 , 26 ] showed that a good trade-off between the engine performance and its dynamic behavior occurs when

, providing important guidance when real power plants are designed. This indicates that

plays an important role in engine performance as other authors have stated [ 27 , 28 ].…”

Section: Discussionsupporting

confidence: 71%

Comparative Performance Analysis of a Simplified Curzon-Ahlborn Engine

Páez-Hernández

Chimal-Eguía

Ladino-Luna

et al. 2018

Entropy

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This paper presents a finite-time thermodynamic optimization based on three different optimization criteria: Maximum Power Output (MP), Maximum Efficient Power (MEP), and Maximum Power Density (MPD), for a simplified Curzon-Ahlborn engine that was first proposed by Agrawal. The results obtained for the MP are compared with those obtained using MEP and MPD criteria. The results show that when a Newton heat transfer law is used, the efficiency values of the engine working in the MP regime are lower than the efficiency values ( τ ) obtained with the MEP and MPD regimes for all values of the parameter τ = T 2 / T 1 , where T 1 and T 2 are the hot and cold temperatures of the engine reservoirs ( T 2 < T 1 ) , respectively. However, when a Dulong-Petit heat transfer law is used, the efficiency values of the engine working at MEP are larger than those obtained with the MP and the MPD regimes for all values of τ . Notably, when 0 < τ < 0.68 , the efficiency values for the MP regime are larger than those obtained with the MPD regime. Also, when 0.68 < τ < 1 , the efficiency values for the aforementioned regimes are similar. Importantly, the parameter τ plays a crucial role in the engine performance, providing guidance during the design of real power plants.

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“…Moreover, some authors [ 25 , 26 ] showed that a good trade-off between the engine performance and its dynamic behavior occurs when

, providing important guidance when real power plants are designed. This indicates that

plays an important role in engine performance as other authors have stated [ 27 , 28 ].…”

Section: Discussionsupporting

confidence: 71%

Comparative Performance Analysis of a Simplified Curzon-Ahlborn Engine

Páez-Hernández

Chimal-Eguía

Ladino-Luna

et al. 2018

Entropy

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“…In this scenario, a stability study for a particular case when R = 1 was presented in [27]. The third case [23] presented the stability analysis for an engine with internal irreversibilities operating at maximum ecological function (Equations (5) and (6)). …”

Section: Steady-state Properties and Stability Analysis Of The Ca Enginementioning

confidence: 99%

“…Specifically, the relaxation time evolution derived from the linearization of the dynamic equations [23,25,27,29] are shown. Figure 7 shows the behavior of the relaxation times for the CA engine operating at maximum power (a) and maximum ecological function (b).…”

Section: Relaxation Times For Ni and Nia Adiabats: A Comparative Analmentioning

confidence: 99%

“…On the other hand, the optimal thermodynamic properties, namely, high power output, high efficiency, low entropy production, etc., guarantee the convenience of the energy converting system. Moreover, it has been shown [18][19][20][21][22][23] that these two physical properties inherently contain a certain kind of trade-off due to the fact that both are governed by the same parameters. The former reflects a certainty that while the stability becomes stronger the thermodynamic properties become weaker, and thus, it is clear that both properties must be adjusted in order to have the best possible system design.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic and Thermodynamic Properties of a CA Engine with Non-Instantaneous Adiabats

Páez-Hernández

Sánchez-Salas

Chimal-Eguía

et al. 2017

Entropy

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Abstract:This paper presents an analysis of a Curzon and Alhborn thermal engine model where both internal irreversibilities and non-instantaneous adiabatic branches are considered, operating with maximum ecological function and maximum power output regimes. Its thermodynamic properties are shown, and an analysis of its local dynamic stability is performed. The results derived are compared throughout the work with the results obtained previously for a case in which the adiabatic branches were assumed as instantaneous. The results indicate a better performance for thermodynamic properties in the model with instantaneous adiabatic branches, whereas there is an improvement in robustness in the case where non-instantaneous adiabatic branches are considered.

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“…Reyes-Ramírez et al [3] presents a global stability analysis of a Curzon-Ahlborn heat engine considering different regimes of performance: maximum power (MP), efficient power (EP) and the so-called ecological function (EF). Sanchez-Salas et al [5] extended a previous work and studied the local stability of an endoreversible Curzon-Ahlborn engine working in the ecological regime, with inclusion of the engine inherent time delays to account for internal irreversibilities. Besides, in order to compare the ecological and maximum power regimes, they included a third criteria named Maximum efficient power.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Operation Conditions of Stability on a Gamma Stirling Engine

Hachem

Gheith

Aloui³

et al. 2016

Volume 1B, Symposia: Fluid Mechanics (Fundamental Issues and Perspectives; Industrial and Environmental Applications); Multipha

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Considering Stirling engines modern applications and cogeneration recovery energy from industrial process, the power of a Stirling prime mover is to be provided at a speed of rotation adapted to the operation of the receiver system (usually a generator) to exploit the performance of this machine under the conditions of its use (ie lowering of the rotational speed and torque transmitted rise or, more rarely, elevated speed and lowering the torque transmitted). Knowing that the hot air engine cannot change speed quickly and in order to have a well designed system, it is important to study the unsteady state conditions. In this work we present an experimental stability analysis of an irreversible heat engine working at different conditions. The experimental study aims at analyzing the effect of working parameters disruption on the stability of the Gamma Stirling engine. Parameters involved in this experimental study are the load pressure of the motor and the load applied to the Stirling engine. The influence of engine operating parameters on its torque and rotational speed is investigated. The time required by a gamma type Stirling engine to stabilize operation after disruption is estimated. Results show that after a small disruption, speed and temperature evolutions decays exponentially to the steady state determined by a relaxation time. It is assumed that the decrease of the applied power load to the engine or the increase of the load pressure leads to a speed up. And that the increase of the applied power load to the engine or the decrease of the load pressure leads to a speed down.

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On the Dynamic Robustness of a Non-Endoreversible Engine Working in Different Operation Regimes

Cited by 9 publications

References 31 publications

Comparative Performance Analysis of a Simplified Curzon-Ahlborn Engine

Comparative Performance Analysis of a Simplified Curzon-Ahlborn Engine

Dynamic and Thermodynamic Properties of a CA Engine with Non-Instantaneous Adiabats

Experimental Study of the Operation Conditions of Stability on a Gamma Stirling Engine

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