Carnot, Stirling, Ericsson stochastic heat engines: Efficiency at maximum power

This work obtains the efficiency at maximum power for a stochastic heat engine performing Carnot-like, Stirling-like and Ericsson-like cycles. For the mesoscopic engine a Brownian particle trapped by an optical tweezers is considered. The dynamics of this stochastic engine is described as an overdamped Langevin equation with a harmonic potential, whereas is in contact with two thermal baths at different temperatures, namely, hot ($T_h$) and cold ($T_c$). The harmonic oscillator Langevin equation is transformed into a macroscopic equation associated with the mean value $\langle x^2(t)\rangle$ using the original Langevin approach. At equilibrium stationary state this quantity satisfies a state-like equation from which the thermodynamic properties are calculated. To obtained the efficiency at maximum power it is considered the finite-time cycle processes under the framework of low dissipation approach.Comment: 2 3pages, 5 figure

Energy conversion theorems for some linear steady-states

One of the main issues that real energy converters present, when they produce effective work, is the inevitable entropy production. Within the context of Non-equilibrium Thermodynamics, entropy production tends to energetically degrade man-made or living systems. On the other hand, it is also not useful to think about designing an energy converter that works in the so-called minimum entropy production regime since the effective power output and efficiency are zero. In this manuscript, we establish some \textit{Energy Conversion Theorems} similar to Prigogine's one with constrained forces, their purpose is to reveal trade-offs between design and the so-called operation modes for $\left(2\times2\right)$--linear isothermal energy converters. The objective functions that give rise to those thermodynamic constraints show stability. A two--meshes electric circuit was built as an example to demonstrate the Theorems' validity. Likewise, we reveal a type of energetic hierarchy for power output, efficiency and dissipation function when the circuit is tuned to any of the operating regimes studied here: maximum power output ($MPO$), maximum efficient power ($MP\eta$), maximum omega function ($M\Omega$), maximum ecological function ($MEF$), maximum efficiency ($M\eta$) and minimum dissipation function ($mdf$).Comment: 33 pages, 15 figures, 2 table

Simulation of demand side participation in Spanish short term electricity markets

Demand response resources management is one of the most investigated solutions oriented to improve the efficiency in electricity markets. In this paper, the capability of customers to participate in short term markets is analyzed. An available methodology to analyze the daily and monthly energy consumptions of large customers is used to create energy offers and bids. This allows customers to participate in energy markets in order to buy, as first step, the usual electricity consumption and, additionally, to offer demand reductions in the short term electricity markets. Additionally, this paper shows the customer potential to participate in the Spanish electricity markets.Valencia Salazar, I.; Álvarez Bel, CM.; Escrivá Escrivá, G.; Alcázar Ortega, M. (2011). Simulation of demand side participation in Spanish short term electricity markets. Energy Conversion and Management. 52(7):2705-2711. doi:10.1016/j.enconman.2011.02.005S2705271152

Campaña de sensibilización para el proyecto Ciudad Amigable con los mayores en Guadalajara, Jalisco: Equipo de producción

El presente reporte se enfoca en la creación de materiales audiovisuales para transformar la percepción actual de las y los adultos mayores, esto a partir de un eje rector que fue la diversidad en las formas de envejecer. El objetivo fue crear una campaña de sensibilización a partir de contenidos que se habían hecho en periodos anteriores del PAP, y con estos, mostrar una imagen digna de las y los adultos mayores para generar una transformación de los estereotipos que giran en torno a ellos. El trabajo se realizó a partir de un diagnóstico para conocer las formas en que se estaban siendo representados los adultos mayores en distintos medios de comunicación; y a partir de ahí se identificaron los recursos y elementos que ayudaban a generar una imagen digna e íntegra de ellos y los que no para usar como referencia de lo que se debía hacer y lo que no. Dentro de los resultados, encontramos distintos productos audiovisuales y gráficos que forman parte de una campaña de sensibilización y en los que se construye una imagen digna de los adultos mayores teniendo en cuenta las distintas formas de envejecer.ITESO, A.C