Modeling and simulation of a braking energy regeneration system in hydraulic hybrid vehicles in the Colombian topography

In this work presents the modeling and simulation of a braking energy regeneration system in a hydraulic hybrid vehicle. The vehicle used for testing is a 15000 kg heavy duty truck. The proposed regeneration system configured in parallel was subjected to a standard test speed profile such as the NEDC (New European Driving Cycle) and a real speed profile of a delivery vehicle in Colombian territory that was obtained by satellite tracking in order to compare its performance as an alternative in energy saving. A hydraulic circuit has been designed that considers travel characteristics such as track slope and vehicle speed to control hydraulic device displacement and mode of operation (braking and propulsion), as well as the dynamic model of the vehicle. The simulation has been developed in Matlab Simulink. The results of the model simulation are compared according to the torque required by the vehicle, the regenerated torque and the final torque. System performances are also compared with constant and variable displacement hydraulic device based on speed profiles and show a decrease in the torque spikes required in both the fixed and variable displacement of the hydraulic device, these energy savings have been estimated with the calculation of the power consumed based on time and are reflected as a percentage of the total required power. The development of the simulation yielded savings percentages of 15.5% and 22.5% for fixed and variable displacement respectively

Estudio del modelado de combustión de biomasa sólida mediante OpenFoam

Biomass is an important renewable energy source that has great potential as a substitute for fossil fuels in the short and medium-term, which has led to the development of various methods for its energy conversion, of which combustion is the most widely used. This process has several environmental advantages compared to traditional energy sources, however, there is still a long way to go in terms of process efficiency and emission reduction. In this context, CFD computational models are a powerful tool that allows to study and improve the performance of combustion systems in a safe, fast and economical way, compared to experimental studies. OpenFoam is one of the most important CFD software currently available, however, there are few works that use it to simulate the combustion of solid biomass. In this work an application of the software in modeling of a biomass boiler fueled by grape marc is reported, this model allows predict important parameters like CO, H2O and velocity fields in a 2D domain.La biomasa es una importante fuente de energía renovable que tiene un gran potencial como sustituta de los combustibles fósiles en el corto y mediano plazo, lo cual ha llevado al desarrollo de varios métodos para su conversión energética, de los cuales la combustión es el más utilizado. Este proceso, llevado a cabo con biomasa, tiene varias ventajas medioambientales comparadas con el mismo al utilizar fuentes de energía tradicionales, sin embargo, todavía hay un camino largo por recorrer en términos de mejora de la eficiencia del proceso y la reducción de emisiones. En este contexto, los modelos computacionales CFD son una herramienta poderosa que permite estudiar y mejorar el desempeño de sistemas de combustión de una manera segura, rápida y económica, en comparación con estudios experimentales. OpenFoam es uno de los softwares CFD más importantes disponibles en la actualidad, no obstante, hay pocos trabajos que lo utilicen para simular la combustión de biomasa sólida. En este trabajo se reporta una aplicación de dicho software en el modelado de la combustión en una caldera alimentada con orujo de uva, este modelo permite predecir parámetros importantes como el campo de velocidades y las emisiones de CO y H2O en un dominio 2D