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Papers by Ricardo Chacartegui
Energy Conversion and Management, Oct 1, 2017
Energy Conversion and Management, Oct 1, 2016
Energy storage system based on transcritical CO2 cycles and geological storage
Applied Thermal Engineering, Jul 1, 2021
Abstract The use of CO2 as a working fluid in power generation and storage applications has exper... more Abstract The use of CO2 as a working fluid in power generation and storage applications has experienced a significant boost in recent years, based on its high-performance characteristics in power generation or heat pumps. This work proposes a novel combined use of transcritical CO2 cycles as an energy storage system and carbon dioxide storage inside geological formations. In this work, the layouts for concept integration were developed. They were adapted to operate under different scenarios and operation modes based on storing energy from renewable sources or storing energy to capture CO2. The preliminary results show these cycles as promising energy storage technologies, with a high potential to compete in terms of electric to electric storage efficiencies (42-56%) and costs (70-120 USD/MWh). Besides, results show that more than 1 Mton/year of CO2 could be additionally stored with this renewable energy storage concept depending on the conditions. These results show the opportunity for the concept as an energy storage system, with special interest when combined with carbon-intensive industries as cement or chemicals.
Renewable & Sustainable Energy Reviews, Feb 1, 2018
Energy Conversion and Management, Jul 1, 2019
Negative emissions power plant based on flexible calcium-looping process integrated with renewables and methane production
Renewable & Sustainable Energy Reviews, Oct 1, 2023
Analysis of an ultra-low temperature district heating and cooling as a storage system for renewable integration
Applied Thermal Engineering, Nov 1, 2022
Atmosphere
The main objective of the present study is the development of a comprehensive methodology for the... more The main objective of the present study is the development of a comprehensive methodology for the estimation of the Carbon Footprint (CF) of research project activities and the identification of the best practices that can be followed by project partners within the project implementation to reduce its carbon footprint. The CF methodology is based on the GHG Protocol Guidance and the emissions factors of the Department for Environment Food & Rural Affairs (DEFRA). The emissions sources related to project activities are the following: heating (from fuels combustion), electricity, water, work-commuting, materials, printable deliverables, IT equipment and events. An application study is performed for a research project focusing on the Mediterranean area and it is found that on-site events represent a 41% share of the total CF of the project. The use of public transport and soft mobility by employees can result in a −37% reduction in the CF of work-commuting. The most significant best pr...
Sustainability
The present study aimed to provide an in-depth assessment of the commuting patterns of scholar co... more The present study aimed to provide an in-depth assessment of the commuting patterns of scholar communities of southwestern European countries and to identify measures to improve their sustainable performance regarding mobility. The adopted methodology characterised the mobility pattern of students as a sustainability indicator and the availability of related infrastructures and local public transport network. Data were gathered by qualitative (behavioural questionnaires) and quantitative (technical audits) approaches, based on measurable indicators (key performance indicators and scores (ranging between 0–5)). Overall, French schools showed the best sustainable performance regarding mobility (2.0) and Gibraltar had the lowest (1.2). The existence of bike parking and electric car charging points were the main weaknesses founds (with their related mean scores being 0.6 and 0.2, respectively). The score associated with annual CO2 emissions due to students’ mobility had the best perform...
Resumen Este artículo aborda la validación de una herramienta numérica, basada en técnicas de vol... more Resumen Este artículo aborda la validación de una herramienta numérica, basada en técnicas de volúmenes finitos, para el estudio de flujos bidimensionales, compresibles, viscosos, previamente desarrollada, tras su adaptación a un mallador genérico comercial. Se describen las modificaciones añadidas al código original, de manera que se contemplen de manera adecuada las irregularidades del mallado, indicando la formulación empleada. Finalmente se presentan los resultados para dos configuraciones de cascadas de turbomáquinas axiales con perfiles NACA 65010 y C4 con diferentes incidencias.
In this paper the causes of a pump-engine systematic failure are analyzed. These consist of the b... more In this paper the causes of a pump-engine systematic failure are analyzed. These consist of the breakage of the rotors of the pump (6 stages) by the admission section as well as of the closing. The analysis has been developed in three steps: a) development of a torsion dynamic model b) development of a dynamic model in order to identify the critics speeds, c) experimental validation and measure of instantaneous parameters. The analysis has allowed identifying the operation of the pump-motor system closely to a torsion resonance, which has caused a premature deterioration of the keyway, as well as the abrasion of the rotors.
Las prestaciones y las emisiones contaminantes de los motores alternativos dependen en gran medid... more Las prestaciones y las emisiones contaminantes de los motores alternativos dependen en gran medida de la eficacia del proceso de renovación de la carga y del movimiento del aire en el interior del cilindro. Centrándose en la admisión de un motor de encendido por compresión los fenómenos que más afectan a las prestaciones del motor son la evolución del aire por el conducto de admisión y a través de la válvula, caracterizado por el coeficiente de descarga, y la turbulencia dentro del cilindro. Los códigos de cálculo fluidodinámico actuales (CFD) permiten modelar con gran precisión el flujo, y por tanto son una valiosa ayuda en la etapa de diseño. En este estudio el CFD ha servido para complementar el estudio experimental de los anteriores procesos.
RESUMEN El presente trabajo describe la herramienta numérica para el estudio de probl.!mas fluido... more RESUMEN El presente trabajo describe la herramienta numérica para el estudio de probl.!mas fluido-mecánicos bidimensionales. basada en técnicas de discretización mediante volúmene� finitos. Esta herramienta plantea las ecuaciones de Navier-Stok.:s. sin simplificaciones en sus términos. buscando la máxima generalidad de la misma. ¡>1:rmitiendo la posibilidad de abarcar un amplio abanico de problemas de muy diversa naturaleza. Se presenran las técnicas y criterios empleados para el desarrollo de la herramienta. así como su validación con diferentes problemas fluido-mecánicos. relacionados con distintas carncterísticas de flujo. mostrando la versatilidad del mismo. Palabras clave: CFD. Volúmenes finitos. método PISO. método SIMPLE
Building and Environment, 2021
Indoor air quality in schools has a direct impact in the performance and wellbeing of students. A... more Indoor air quality in schools has a direct impact in the performance and wellbeing of students. Aiming to identify sustainable and affordable design solutions for new school buildings and retrofitting processes, this paper analyses a representative sample of primary and secondary schools in Mediterranean climate. They were selected to have a representative variety of ages, daily scholar schedules and building designs. The monitoring campaign was developed in the spring season, with moderate external temperatures, in order to identify air renovation requirements related to the analysed elements. The study focuses on the analysis of indoor CO2, PM10, PM2.5 concentration profiles and their relationship with indoor temperature, relative humidity, occupation rates and ventilation measures. The results show a wide dispersion in CO2 concentrations, ranging between 400 and 5000 ppm, and particulate matter fractions, ranging between 1.3 and 11.8 μg/m 3 for PM2.5 and 2.2 and 27.1 μg/m 3 for PM10. These variations are related to the occupation rates, metabolism of occupants, with peaks before break periods, and ventilation actions. Concentrations are also compared to external conditions, in all cases with higher indoor levels than outdoor. The analysis shows that, for the representative sample under analysis, with adequate natural ventilation designs, indoor air quality can be maintained within comfort conditions.
Energy Conversion and Management, 2020
Energy Conversion and Management, Oct 1, 2017
Energy Conversion and Management, Oct 1, 2016
Energy storage system based on transcritical CO2 cycles and geological storage
Applied Thermal Engineering, Jul 1, 2021
Abstract The use of CO2 as a working fluid in power generation and storage applications has exper... more Abstract The use of CO2 as a working fluid in power generation and storage applications has experienced a significant boost in recent years, based on its high-performance characteristics in power generation or heat pumps. This work proposes a novel combined use of transcritical CO2 cycles as an energy storage system and carbon dioxide storage inside geological formations. In this work, the layouts for concept integration were developed. They were adapted to operate under different scenarios and operation modes based on storing energy from renewable sources or storing energy to capture CO2. The preliminary results show these cycles as promising energy storage technologies, with a high potential to compete in terms of electric to electric storage efficiencies (42-56%) and costs (70-120 USD/MWh). Besides, results show that more than 1 Mton/year of CO2 could be additionally stored with this renewable energy storage concept depending on the conditions. These results show the opportunity for the concept as an energy storage system, with special interest when combined with carbon-intensive industries as cement or chemicals.
Renewable & Sustainable Energy Reviews, Feb 1, 2018
Energy Conversion and Management, Jul 1, 2019
Negative emissions power plant based on flexible calcium-looping process integrated with renewables and methane production
Renewable & Sustainable Energy Reviews, Oct 1, 2023
Analysis of an ultra-low temperature district heating and cooling as a storage system for renewable integration
Applied Thermal Engineering, Nov 1, 2022
Atmosphere
The main objective of the present study is the development of a comprehensive methodology for the... more The main objective of the present study is the development of a comprehensive methodology for the estimation of the Carbon Footprint (CF) of research project activities and the identification of the best practices that can be followed by project partners within the project implementation to reduce its carbon footprint. The CF methodology is based on the GHG Protocol Guidance and the emissions factors of the Department for Environment Food & Rural Affairs (DEFRA). The emissions sources related to project activities are the following: heating (from fuels combustion), electricity, water, work-commuting, materials, printable deliverables, IT equipment and events. An application study is performed for a research project focusing on the Mediterranean area and it is found that on-site events represent a 41% share of the total CF of the project. The use of public transport and soft mobility by employees can result in a −37% reduction in the CF of work-commuting. The most significant best pr...
Sustainability
The present study aimed to provide an in-depth assessment of the commuting patterns of scholar co... more The present study aimed to provide an in-depth assessment of the commuting patterns of scholar communities of southwestern European countries and to identify measures to improve their sustainable performance regarding mobility. The adopted methodology characterised the mobility pattern of students as a sustainability indicator and the availability of related infrastructures and local public transport network. Data were gathered by qualitative (behavioural questionnaires) and quantitative (technical audits) approaches, based on measurable indicators (key performance indicators and scores (ranging between 0–5)). Overall, French schools showed the best sustainable performance regarding mobility (2.0) and Gibraltar had the lowest (1.2). The existence of bike parking and electric car charging points were the main weaknesses founds (with their related mean scores being 0.6 and 0.2, respectively). The score associated with annual CO2 emissions due to students’ mobility had the best perform...
Resumen Este artículo aborda la validación de una herramienta numérica, basada en técnicas de vol... more Resumen Este artículo aborda la validación de una herramienta numérica, basada en técnicas de volúmenes finitos, para el estudio de flujos bidimensionales, compresibles, viscosos, previamente desarrollada, tras su adaptación a un mallador genérico comercial. Se describen las modificaciones añadidas al código original, de manera que se contemplen de manera adecuada las irregularidades del mallado, indicando la formulación empleada. Finalmente se presentan los resultados para dos configuraciones de cascadas de turbomáquinas axiales con perfiles NACA 65010 y C4 con diferentes incidencias.
In this paper the causes of a pump-engine systematic failure are analyzed. These consist of the b... more In this paper the causes of a pump-engine systematic failure are analyzed. These consist of the breakage of the rotors of the pump (6 stages) by the admission section as well as of the closing. The analysis has been developed in three steps: a) development of a torsion dynamic model b) development of a dynamic model in order to identify the critics speeds, c) experimental validation and measure of instantaneous parameters. The analysis has allowed identifying the operation of the pump-motor system closely to a torsion resonance, which has caused a premature deterioration of the keyway, as well as the abrasion of the rotors.
Las prestaciones y las emisiones contaminantes de los motores alternativos dependen en gran medid... more Las prestaciones y las emisiones contaminantes de los motores alternativos dependen en gran medida de la eficacia del proceso de renovación de la carga y del movimiento del aire en el interior del cilindro. Centrándose en la admisión de un motor de encendido por compresión los fenómenos que más afectan a las prestaciones del motor son la evolución del aire por el conducto de admisión y a través de la válvula, caracterizado por el coeficiente de descarga, y la turbulencia dentro del cilindro. Los códigos de cálculo fluidodinámico actuales (CFD) permiten modelar con gran precisión el flujo, y por tanto son una valiosa ayuda en la etapa de diseño. En este estudio el CFD ha servido para complementar el estudio experimental de los anteriores procesos.
RESUMEN El presente trabajo describe la herramienta numérica para el estudio de probl.!mas fluido... more RESUMEN El presente trabajo describe la herramienta numérica para el estudio de probl.!mas fluido-mecánicos bidimensionales. basada en técnicas de discretización mediante volúmene� finitos. Esta herramienta plantea las ecuaciones de Navier-Stok.:s. sin simplificaciones en sus términos. buscando la máxima generalidad de la misma. ¡>1:rmitiendo la posibilidad de abarcar un amplio abanico de problemas de muy diversa naturaleza. Se presenran las técnicas y criterios empleados para el desarrollo de la herramienta. así como su validación con diferentes problemas fluido-mecánicos. relacionados con distintas carncterísticas de flujo. mostrando la versatilidad del mismo. Palabras clave: CFD. Volúmenes finitos. método PISO. método SIMPLE
Building and Environment, 2021
Indoor air quality in schools has a direct impact in the performance and wellbeing of students. A... more Indoor air quality in schools has a direct impact in the performance and wellbeing of students. Aiming to identify sustainable and affordable design solutions for new school buildings and retrofitting processes, this paper analyses a representative sample of primary and secondary schools in Mediterranean climate. They were selected to have a representative variety of ages, daily scholar schedules and building designs. The monitoring campaign was developed in the spring season, with moderate external temperatures, in order to identify air renovation requirements related to the analysed elements. The study focuses on the analysis of indoor CO2, PM10, PM2.5 concentration profiles and their relationship with indoor temperature, relative humidity, occupation rates and ventilation measures. The results show a wide dispersion in CO2 concentrations, ranging between 400 and 5000 ppm, and particulate matter fractions, ranging between 1.3 and 11.8 μg/m 3 for PM2.5 and 2.2 and 27.1 μg/m 3 for PM10. These variations are related to the occupation rates, metabolism of occupants, with peaks before break periods, and ventilation actions. Concentrations are also compared to external conditions, in all cases with higher indoor levels than outdoor. The analysis shows that, for the representative sample under analysis, with adequate natural ventilation designs, indoor air quality can be maintained within comfort conditions.
Energy Conversion and Management, 2020