Ignacio Lopez paniagua

Ignacio Lopez paniagua
Universidad Politécnica de Madrid | UPM · Departamento de Ingeniería Energética

Doctor of Engineering

About

51
Publications
10,985
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364
Citations
Citations since 2017
10 Research Items
144 Citations
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20172018201920202021202220230102030

Publications

Publications (51)
Article
Full-text available
In this work, an evaluation and quantification of the impact of using mixtures based on supercritical carbon dioxide "s-CO2" (s-CO2/COS, s-CO2/H2S, s-CO2/NH3, s-CO2/SO2) are made as a working fluid in simple and complex recompression Brayton s-CO2 power cycle configurations that have pressure drops in their components. These cycles are coupled with...
Preprint
In this work, an evaluation and quantification of the impact of using mixtures based on Supercritical Carbon Dioxide "s-CO2" (s-CO2/COS, s-CO2/H2S, s-CO2/NH3, s-CO2/SO2) are made as a working fluid in simple and complex recompression Brayton s-CO2 power cycles configurations that have pressure drops in their components. These cycles are coupled to...
Article
Natural gas liquefaction allows to transport this energy vector over long distances from stranded reserves to the market. Pure Refrigerant Cascade processes are responsible for more than 105 mtpa of the existing LNG base-load production. Classical Cascade process developed by Conoco Philips consists of three pure component closed refrigeration loop...
Chapter
To which extent are the final marks of an Engineering Degree Project determined by the technical quality of the work? To which extent by the horizontal skills of the student? The educational paradigm of the European Higher Education Area (EHEA) integrates both sides. Inevitably, the subjects included in the curriculum of an engineering degree are m...
Article
Full-text available
Industrial nitrogen liquefaction cycles are based on the Collins topology but integrate variations. Several pressure levels with liquefaction to medium pressure and compressor-expander sets are common. The cycle must be designed aiming to minimise specific power consumption rather than to maximise liquid yield. For these reasons, conclusions of gen...
Article
Full-text available
The optimum pressure ratio for the stages of a multistage compression process is calculated with a well known formula that assigns an equal ratio for all stages, based on the hypotheses that all isentropic efficiencies are also equal. Although the derivation of this formula for two stages is relatively easy to find, it is more difficult to find for...
Article
Full-text available
Although CO 2 as refrigerant is well known for having the lowest global warming potential (GWP), and commercial domestic heat pump water heater systems exist, its long expected wide spread use has not fully unfolded. Indeed, CO 2 poses some technological difficulties with respect to conventional refrigerants, but currently, these difficulties have...
Article
The first results of a new line of research are presented, focused on producing rocket propulsion based upon the chemical reaction of two of the most abundant and affordable substances in nature: water and sodium. We have chosen SWR (Sodium Water Reaction) as a fuel candidate for an advanced propellant because of its excellent energetic properties,...
Conference Paper
Full-text available
Los equipos de bomba de calor (BC) son un reemplazo eficaz de los sistemas convencionales para calefacción, refrigeración y agua caliente sanitaria. Este potencial de alta eficiencia es reconocido por la Directiva Europea 2009/28/EC. En el proyecto EkimProVe se propone un sistema donde una BC se acopla a una fachada ventilada fotovoltaica (FV/PV)....
Article
Chemical-looping combustion is an interesting technique that makes it possible to integrate power generation from fuels combustion and sequestration of carbon dioxide without energy penalty. In addition, the combustion chemical reaction occurs with a lower irreversibility compared to a conventional combustion, leading to attain a somewhat higher ov...
Article
Chemical-looping combustion for power generation has significant advantages over conventional combustion. Mainly, it allows an integration of CO2 capture in the power plant without energy penalty; secondly, a less exergy destruction in the combustion chemical transformation is achieved, leading to a greater overall thermal efficiency. Most efforts...
Article
Full-text available
Three alternatives for integrating a solar field with the bottoming cycle of a combined cycle plant are modeled: parabolic troughs with oil at intermediate and low cycle pressures and Fresnel linear collectors at low cycle pressure. It is assumed that the plant will always operate at nominal conditions, using post-combustion during the hours of no...
Article
Construction of robotic controllers has been usually done by the instantiation of specific architectural designs. The ASys design strategy described in this work addresses the synthesis of custom robot architectures by means of a requirements-driven application of universal design patterns. In this paper we present three of these patterns -the Epis...
Article
This paper proposes a first study in-depth of solar fossil hybridization from a general perspective. It develops a set of useful parameters for analyzing and comparing hybrid plants, it studies the case of hybridizing Brayton cycles with current solar technologies and shows a tentative extrapolation of the results to integrated combined cycle syste...
Conference Paper
Photovoltaic modules are more efficient the lower their temperature is. Photovoltaic-thermal technologies, PVT, exploit this feature by refrigerating the conventional photovoltaic module with a heat exchanger, usually based either on air or on water. The water is heated in the exchanger, so it can be used as hot water directly, saving energy. Howev...
Article
The problem of the high carbon dioxide emissions linked to power generation makes necessary active research on the use of biofuels in gas turbine systems as a promising alternative to fossil fuels. Gasification of biomass waste is particularly of interest in obtaining a fuel to be run in gas turbines, as it is an efficient biomass-to-biofuel conver...
Article
Biomass Integrated Gasification Combined Cycles (BioIGCC) are a promising technology, alternative to fossil fuels for power generation. Significant reduction of CO2 emissions could be achieved, although important changes in the gas turbines and gasifiers design and further technological development would be necessary. The aim of this work is to stu...
Article
Full-text available
This paper presents an abbreviated method for estimating exergy destruction in a heat exchanger, requiring only black-box data of the exchanger's inputs and outputs, and eliminating part of the mathematical difficulties associated with the calculations. A well-known model for temperature distributions in an exchanger is adapted for this case, and i...
Article
Full-text available
The utilisation of biofuels in gas turbines is a promising alternative to fossil fuels for power generation. It would lead to a significant reduction of CO2 emissions using an existing combustion technology, although considerable changes appear to be required and further technological development is necessary. The goal of this work is to conduct en...
Article
New degrees adapted to the so called European Higher Education Area (EHEA) arising from the Bologna Declaration of 1999 have began to be widespread taught in the academic year 2010-2011. This has brought about a small revolution in universities, regarding that the modification of well-established methods and concepts has been required. Being aware...
Article
The static formation temperature of a petroleum reservoir is relevant for evaluating its properties. There is a variety of methods for estimating it. However, each method assumes different hypotheses and simplifications which lead to diverging estimations, in some cases far from the real value. This makes difficult knowing in advance which method t...
Article
The two main statements of the second law of thermodynamics were given by Clausius, and Kelvin and Planck. Other statements followed well into the 20th century. It is known that the two main statements are not exactly equivalent, although their differences may never show outside academic environments or very specific areas of science. At negative a...
Article
This paper presents a study of second-law efficiency in a standard Brayton combined cycle power generation, using several paraffinic fuels ranging from methane to heptane. The main objective of the study was to identify a trend with the number of carbon atoms in the compound. In this way, a qualitative criterion can be built to evaluate the propert...
Article
The European strategies on energy have been searching for years to reduce the dependency of Europe from fossil fuels. Underlying this effort, there exist geopolitical, economic, environmental reasons and the reality that oil reservoirs will dry out some day. Renewable energies have become a milestone of this strategy, now that their huge potential...
Conference Paper
This paper is going to address the topic of hardware/software systems co-design. The paper will develop two points of view. First, it provides a system-theoretical layout on the problem of designing hardware-software systems. This layout will enable the designer to proceed systematically in optimizing the tradeoff between the desired functionality,...
Chapter
Full-text available
This work was developed funded by the Spanish Ministry of Science under the National R&D Plan: PROFIT, FIT 110100-2001-10, TRA2004-07441-C03-03/AUT, TEC2008-06846-C0201/TEC; and by the European Commission ARTEMIS-2008 program: SMART (Secure, Mobile visual sensor networks Architecture). The authors wish also to thank Teresa Riesgo, Ruben Salvador an...
Article
Las estrategias europeas de energia hace anos que vienen persiguiendo avances significativos en la independizacion energetica de Europa de los combustibles fosiles. Detras de esto existen razones geopoliticas, economicas, ambientales y la realidad de que las reservas de petroleo se agotaran algun dia. Las energias renovables se han convertido en un...
Article
Railway freight transportation presents a degree of complexity which frequently makes impossible to model it with sufficient precision. Currently, energetic and environmental impacts of freight transportation are usually modelled following average data, which do not reflect the characteristics of specific lines. These models allow qualitative appro...
Article
Full-text available
The functional capabilities that consciousness seems to provide to biological systems can supply valuable principles in the design of more autonomous and robust technical systems. These functional concepts keep a notable similarity to those underlying the notion of operating system in software engineering, which allows us to specialize the computer...
Article
This paper presents the experience carried out at the Industrial Engineering School (ETSII) of the Universidad Politécnica de Madrid (UPM) for teaching Thermodynamics science using new methodologies and technologies. During the last two years a special course on Thermodynamics has been given to those students who failed to pass the ordinary examina...
Chapter
Full-text available
Wisdom and sapience have traditionally been considered desirable traits in humans, but the use of the terms is decaying, due perhaps to an arising relativism that lessens the value of others’ knowledge. This chapter proposes an interpretation of sapience in terms of meaning generation and knowledge exploitation in social groups of knowledge-based a...
Article
Full-text available
The ICEA project (www2.his.se/icea/) is a four-year project on bio-inspired integrated cognitive control, bringing together cognitive scientists, neuroscientists, psychologists, roboticists and control engineers. The primary objective of the whole project is to develop a new cognitive system architecture to be used in technical systems and that int...
Article
In this paper we will argue that given certain conditions for the evolution of biological controllers, they will necessarily evolve in the direction of incorporating consciousness capabilities. We will also see what are the necessary mechanics for the provision of these capabilities and extrapolate this vision to the world of artificial systems.
Conference Paper
This paper describes an experiment to implement a high-level, cognitive architecture on limited resources, namely, an altera cyclone/cyclone-II FPGA. It is part of a broader line of research investigating methods of scaling high-level, cognitive or "intelligent" architectures into limited resources, for building embedded systems. An artificial visi...
Article
Full-text available
Se propone un bosquejo de teoría para el estudio del fenómeno de la consciencia desde un punto de vista unificador -natural y artificial- basado en el análisis de la mente como un fenómeno de control. Se incluye una justificación de la investigación en consciencia artificial no como imitación mecánica de la consciencia natural, sino por las propied...
Article
In this paper we propose an architecture for an embedded traffic signal detection system. Development of Advanced Driver Assistance Systems (ADAS) is one of the major trends of research in automotion nowadays. Examples of past and ongoing projects in the field are CHAMELEON ("Pre-Crash Application all around the vehicle" IST 1999-10108), PREVENT (P...
Article
Full-text available
The science and technology of computer-based control is facing an enormous challenge when increased levels of autonomy and resilience are required from the machines that are supporting our ambient. We can say, without any doubt, that control systems complexity is boosting. In some sense, software intensive controllers are becoming too complex to be...
Article
Full-text available
The question of measuring intelligence in artifacts and, in particular, evaluating architectures for it, requires not just an understanding of the very nature of intelligence —quite elu- sive objective, indeed— but an appropriate stance for evalua- tion. In this paper we argue that it is not just the case that architectures provide intelligence, bu...
Article
In this paper we describe the approach taken in the UPM Autonomous Systems Laboratory for the development of technology of full, bounded autonomy. This effort is taking us into the study of the phenomenology of consciousness especially in relation with the construction of mechanisms for system self-awareness. The progress of this work can be tracke...
Article
Full-text available
Esta tesis doctoral ofrece una visión conceptual de la percepción, con la intención de ser aplicada en el futuro al análisis y al diseño de sistemas artificiales. Tal y como está expuesta en este trabajo, ofrece un marco conceptual que permite extraer principios y reglas generales sobre el funcionamiento de los sistemas. El marco construido no está...
Conference Paper
In this article, a new real-time hardware architecture based on real time image processing and the use of a particle filter, as the fundamental element for tracking lines of a road, is presented. To this end a hardware system has been designed on an Altera Cyclone FPGA for processing the images obtained from a PAL video camera. This paper is part o...
Article
Full-text available
Ontologies and agents are two research areas that have become intertwined in recent years. Ontologies have started to be developed aiming at agent–based applications. Agents have benefited by the use of ontologies in heavily information– based processes. From the theory of ontology and agenthood to its application in practice, we have reviewed the...
Article
This paper presents a study of pollutant emissions by road vehicles in Spain for the period 2000–2010. This study forms part of the SETISMO project, a global study of transportation in Spain for 1988–2010, and represents the logical continuation of the analysis of pollutant emissions by road transportation in Spain for 1988–1999. The study is based...
Article
Full-text available
Trends in complex, software-intensive control systems show a continuous process of incorporating mechanisms of self-representation and reflection. One of the main reasons is to improve system performance and resilience in changing uncertain environments. These approaches employ runtime models of the system itself that, to some extent, are identifia...
Conference Paper
The nature of applied research in intelligent robot controllers makes having a versatile software architecture a real need for exploring alternative designs in robotic minds construction. The paper presents an experiment in the adaptation of a multi-robot cooperation architecture to a CORBA-based schema. The paper demonstrates not only the feasibil...
Article
Full-text available
Building complex controllers is a major challenge and it is widely accepted that object technology can help with the problem. This is of special relevance in the field of complex robot control, in particular when distribution is necessary. CORBA is a suitable technology for deployment and is well demon-strated in the experimental field and in comme...
Article
Full-text available
This report analyses the aplicability of the principles of consciousness developed in the ASys project to three of the most relevant cognitive architectures. This is done in relation to their aplicability to build integrated control systems and studying their support for general mechanisms of real-time consciousness. To analyse these architectures...

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