#### Filter Results:

- Full text PDF available (6)

#### Publication Year

2001

2017

- This year (1)
- Last 5 years (7)
- Last 10 years (9)

#### Publication Type

#### Co-author

#### Journals and Conferences

#### Key Phrases

Learn More

- C de Tomás, A Calvo Hernández, J M M Roco
- Physical review. E, Statistical, nonlinear, and…
- 2012

A unified optimization criterion for Carnot engines and refrigerators is proposed. It consists of maximizing the product of the heat absorbed by the working system times the efficiency per unit time of the device, either the engine or the refrigerator. This criterion can be applied to both low symmetric dissipation Carnot engines and refrigerators. For… (More)

- B Jiménez de Cisneros, A Calvo Hernández
- Physical review letters
- 2007

Arrays of coupled heat engines are proposed as a paradigmatic model to study the trade-off between individual and collective behavior in linear irreversible thermodynamics. The analysis reveals the existence of a control parameter which selects different operation regimes of the whole array. In particular, the regimes of maximum efficiency and maximum power… (More)

- A C Hernández, A Medina, J M Roco, J A White, S Velasco
- Physical review. E, Statistical, nonlinear, and…
- 2001

We propose a unified optimization criterion for energy converters. It represents the best compromise between energy benefits and losses for a specific job and neither an explicit evaluation of entropies nor the consideration of environmental parameters are required. For all considered systems the criterion predicts a performance regime laying between those… (More)

- Yang Wang, Mingxing Li, Z C Tu, A Calvo Hernández, J M M Roco
- Physical review. E, Statistical, nonlinear, and…
- 2012

The figure of merit for refrigerators performing finite-time Carnot-like cycles between two reservoirs at temperature T(h) and T(c) (<T(h)) is optimized. It is found that the coefficient of performance at maximum figure of merit is bounded between 0 and (sqrt[9+8ε(c)] - 3)/2 for the low-dissipation refrigerators, where ε(c) = T(c)/(T(h) - T(c)) is the… (More)

- B Jiménez de Cisneros, A Calvo Hernández
- Physical review. E, Statistical, nonlinear, and…
- 2008

Full analytical models of heat engines and refrigerators in linear irreversible thermodynamics can be defined by means of a chain of coupled heat devices. In this way it is possible to derive results and techniques of finite-time thermodynamics, like endoreversible efficiencies and the usual models of irreversible heat devices, in terms of an endoreversible… (More)

- Y Izumida, K Okuda, J M M Roco, A Calvo Hernández
- Physical review. E, Statistical, nonlinear, and…
- 2015

We present results obtained by using nonlinear irreversible models for heat devices. In particular, we focus on the global performance characteristics, the maximum efficiency and the efficiency at maximum power regimes for heat engines, and the maximum coefficient of performance (COP) and the COP at maximum cooling power regimes for refrigerators. We… (More)

- Yong Hu, Feifei Wu, +4 authors J M M Roco
- Physical review. E, Statistical, nonlinear, and…
- 2013

We study the coefficient of performance (COP) and its bounds for a Carnot-like refrigerator working between two heat reservoirs at constant temperatures T(h) and T(c), under two optimization criteria χ and Ω. In view of the fact that an "adiabatic" process usually takes finite time and is nonisentropic, the nonadiabatic dissipation and the finite time… (More)

- B Jiménez de Cisneros, L A Arias-Hernández, A Calvo Hernández
- Physical review. E, Statistical, nonlinear, and…
- 2006

Following the recent proposal by Van den Broeck for a heat engine [Phys. Rev. Lett. 95, 190602 (2005)], we analyze the coefficient of performance of a refrigerator in two working regimes using the tools of linear irreversible thermodynamics. In particular, one of the analyzed regimes gives a coefficient of performance which could be considered as the… (More)

- Álvaro Durante, Gabriel Pena-Vergara, Pedro Curto-Risso, Alejandro, Antonio Calvo Hernández
- 2016

A thermodynamic model for a realistic Brayton cycle, working as an externally-fired gas turbine, fueled with biomass, is presented. The use of an external combustion chamber, allows to burn " dirty fuels " to preheat pure air, which is the turbine's working fluid. It also avoids direct contact of ashes with the turbine blades, resulting in a higher life… (More)

- J Pérez, A Padilla, W A Herrebout, B J Van der Veken, A Calvo Hernández, M O Bulanin
- The Journal of chemical physics
- 2005

We report an experimental study of the rotovibrational fundamental PQR-band shapes in the IR absorption spectra of HCl dissolved in condensed rare gases in a wide range of temperatures. The effective vibrational frequencies are determined from analysis of the fine rotational structure partially resolved in the band wings. The central Q-branch components… (More)