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Nelson Calderon Henao

Bio: Nelson Calderon Henao is an academic researcher from Universidade Federal de Itajubá. The author has contributed to research in topics: Thermoelectric generator & Heat of combustion. The author has an hindex of 2, co-authored 3 publications receiving 98 citations.

Papers
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Journal ArticleDOI
TL;DR: A review of the use of thermoelectricity for the energy harvesting, beginning with the main concepts and definitions on the subject, followed by the state of the art containing the main methods and advances in science and technology for the development and application of solid-state micro-generators to capture residual energies as mentioned in this paper.
Abstract: Studies concerning the use of thermoelectric effect for the conversion of thermal energy into electricity have become increasingly numerous since applications of the thermoelectric phenomenon can be limitless. Thermoelectric Generators (TEG) have shown promising results in combustion vehicles, with an overall efficiency increment from 33% to 57%, in addition to an increase of 6% in the available power in an automobile. In the aerospace industry, thermoelectric devices have been employed due to the need of making the most of the available energy. Thermoelectric modules are also used in the harvest of waste heat in wood stoves, furnace walls, and industrial chimneys. In Bioengineering, there are applications for small-scale generation including the use of heat from the human body to feed microelectronic devices and autonomous sensors. Therefore, the article shows a review of the use of thermoelectricity for the energy harvesting, beginning with the main concepts and definitions on the subject, followed by the state of the art containing the main methods and advances in science and technology for the development and application of solid-state micro-generators to capture residual energies.

153 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a numerical modeling for design and dimensioning of micro electric power generating sources, from theoretical performance curves of thermoelectric modules and temperature gradients for future applications in industrial processes.
Abstract: The article presents the results of research that aims at training and consolidation of knowledge and their use for thermoelectric energy harvesting. Therefore, we present a numerical modeling for design and dimensioning of micro electric power generating sources, from theoretical performance curves of thermoelectric modules and temperature gradients for future applications in industrial processes. The final result appears very attractive, since the developed experimental analysis shows promising results, given that many processes generate energy harvesting and, in addition, the cogeneration of power using thermoelectric modules is totally clean, which prevents the emission of gaseous pollute to the environment.

12 citations

Journal ArticleDOI
TL;DR: In this article , the authors have analyzed heavy oil and biomass co-gasification through a model developed in Aspen Plus™ v 11.0 software, which is used to assess main gasification parameters, such as cold gas efficiency, yield, low heating value (LHV), and producer gas composition, using air and oxygen as gasification agents.
Abstract: Heavy oil and biomass co-gasification has been analyzed through a model developed in Aspen Plus™ v 11.0 software. The model was used to assess main gasification parameters, such as cold gas efficiency, yield, low heating value (LHV), and producer gas composition, using air and oxygen as gasification agents. Subsequently, producer gas energy use in the Rankine cycle was performed using a model developed in GateCycle™ v11.1.2.4.850 software. Likewise, the economic indicators of the integrated Rankine cycle-gasification system were calculated. The economic evaluation was developed through Monte Carlo simulation using Crystalball™. The results showed a LHV producer gas decreasing trend as the equivalence ratio (ER) increased, oscillating between 6.37 and 3.63 MJ/Nm3 for ER values greater than 0.30 in the air co-gasification case, while the scenario that used oxygen presented better LHV results, ranging from 9.40 to 11.79 MJ/Nm3. For air co-gasification, the Rankine cycle efficiency range was between 13.0% and 9.5%, while for oxygen co-gasification, values between 14.0% and 13.2% were obtained. Regarding the economic assessment, the two scenarios evaluated (with a reliability of 95%) have a probability higher than 92.1% of economic losses due mainly to the lower electrical power and the local electricity rate.

2 citations

Journal ArticleDOI
TL;DR: In this paper , an energy and economic evaluation of a power generation system composed of a downdraft gasifier and a gas microturbine was performed using Aspen Plus® v 11.0 software and validated using results obtained from published experimental studies.
Abstract: This work focuses on the energy and economic evaluation of a power generation system composed of a downdraft gasifier and gas microturbine. The gasification process was studied using wood pellets as fuel, while the influence of two gasification agents (air and oxygen-enriched air) on parameters, such as low heating value (LHV), composition, and yield of syngas, were analyzed. The syngas produced from oxygen-enriched air gasification in a downdraft gasifier had an LHV higher than 8 MJ/Nm3, being suitable to be supplied in the gas microturbine. Subsequently, syngas use in the gas microturbine was evaluated, and the results demonstrated that microturbine efficiency dropped from 33.00% to 21.35%, while its power decreased from 200 kW to 81.35 kW. The power generation system was modeled using Aspen Plus® v 11.0 software and validated using results obtained from published experimental studies. Accordingly, the integrated generation system presented an overall efficiency of 11.82% for oxygen-enriched air gasification cases. On the other hand, an economic assessment through risk analysis using Monte Carlo simulations was performed using Crystal Ball® v11.1.2.4.850 software. The economic results indicated that the implementation of a generation system was economically unfeasible, however, if the electricity rate price was increased by 63%, the proposed configuration could be feasible.

2 citations

Journal ArticleDOI
28 Dec 2020
TL;DR: In this paper, a modelo hibrido of biogas termoelectrico solar was presented, with the goal of utilizar de manera eficiente la irradiacion solar junto con el calor obtenido de la quema de Biogas.
Abstract: Este articulo presenta un modelo hibrido de biogas termoelectrico solar que tiene como objetivo utilizar de manera eficiente la irradiacion solar junto con el calor obtenido de la quema de biogas. Al principio, se presentan los avances mas recientes en terminos de generadores solares termicos, generadores basados en biogas y ambas tecnologias que funcionan conjuntamente; luego, se describe la metodologia implementada a lo largo de la investigacion, para luego presentar la evaluacion y validacion del generador solar termoelectrico de biogas. Finalmente, los resultados se discuten desde la perspectiva de la factibilidad de implementar esta tecnologia. El nuevo sistema hibrido puede generar hasta 16,79 MWh / ano, tiene un periodo de recuperacion de 7 anos y una tasa interna de rendimiento del 9,34%.

1 citations


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01 Jan 2016

1,633 citations

Journal ArticleDOI
TL;DR: This paper presents an update to the authors' previous review paper by summarizing the notable developments in the field of piezoelectric energy harvesting through the past decade.
Abstract: Energy harvesting technologies have been explored by researchers for more than two decades as an alternative to conventional power sources (e.g. batteries) for small-sized and low-power electronic devices. The limited life-time and necessity for periodic recharging or replacement of batteries has been a consistent issue in portable, remote, and implantable devices. Ambient energy can usually be found in the form of solar energy, thermal energy, and vibration energy. Amongst these energy sources, vibration energy presents a persistent presence in nature and manmade structures. Various materials and transduction mechanisms have the ability to convert vibratory energy to useful electrical energy, such as piezoelectric, electromagnetic, and electrostatic generators. Piezoelectric transducers, with their inherent electromechanical coupling and high power density compared to electromagnetic and electrostatic transducers, have been widely explored to generate power from vibration energy sources. A topical review of piezoelectric energy harvesting methods was carried out and published in this journal by the authors in 2007. Since 2007, countless researchers have introduced novel materials, transduction mechanisms, electrical circuits, and analytical models to improve various aspects of piezoelectric energy harvesting devices. Additionally, many researchers have also reported novel applications of piezoelectric energy harvesting technology in the past decade. While the body of literature in the field of piezoelectric energy harvesting has grown significantly since 2007, this paper presents an update to the authors' previous review paper by summarizing the notable developments in the field of piezoelectric energy harvesting through the past decade.

471 citations

Journal ArticleDOI
TL;DR: An overview of wearables market trends, different active and passive methods of body energy harvesting for powering low-consumption electronic devices are introduced, and challenges of device fabrication are discussed.

323 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a historical and up-to-date account of the energy-related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics.
Abstract: The need for energy-efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up-to-date account of the energy-related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

255 citations

Journal ArticleDOI
23 Nov 2018-Sensors
TL;DR: The principles of a number of energy harvesting technologies applicable to industrial machines are overviews by investigating the power consumption of WSNs and the potential energy sources in mechanical systems.
Abstract: Condition monitoring can reduce machine breakdown losses, increase productivity and operation safety, and therefore deliver significant benefits to many industries. The emergence of wireless sensor networks (WSNs) with smart processing ability play an ever-growing role in online condition monitoring of machines. WSNs are cost-effective networking systems for machine condition monitoring. It avoids cable usage and eases system deployment in industry, which leads to significant savings. Powering the nodes is one of the major challenges for a true WSN system, especially when positioned at inaccessible or dangerous locations and in harsh environments. Promising energy harvesting technologies have attracted the attention of engineers because they convert microwatt or milliwatt level power from the environment to implement maintenance-free machine condition monitoring systems with WSNs. The motivation of this review is to investigate the energy sources, stimulate the application of energy harvesting based WSNs, and evaluate the improvement of energy harvesting systems for mechanical condition monitoring. This paper overviews the principles of a number of energy harvesting technologies applicable to industrial machines by investigating the power consumption of WSNs and the potential energy sources in mechanical systems. Many models or prototypes with different features are reviewed, especially in the mechanical field. Energy harvesting technologies are evaluated for further development according to the comparison of their advantages and disadvantages. Finally, a discussion of the challenges and potential future research of energy harvesting systems powering WSNs for machine condition monitoring is made.

147 citations