Francisco Rey-Martínez - Academia.edu (original) (raw)

Papers by Francisco Rey-Martínez

Proceedings, 2019

Ventilated façades are among the existing measures to reduce the energy demand in buildings. The ... more Ventilated façades are among the existing measures to reduce the energy demand in buildings. The combination of this passive heating and cooling strategy with photovoltaics (PV) can drive new buildings towards the current European targets for near or even net zero-energy buildings (nZEB). The present work aims at studying the PV integrated ventilated façade of the nZEB known as “LUCIA” at the University of Valladolid, Spain. First, the transmissivity of the PV façade is measured. Then, the monitoring of the available solar radiation is presented together with the air-dry bulb temperatures indoors, outdoors and inside the ventilated façade. The experimental results permit the validation of a mathematical model that describes the behaviour of the ventilated façade in its current operating modes. The results show that dampers should be closed during winter to let the façade act as a further insulation for outdoor temperatures below 18.4 C to improve energy efficiency. Indoor air recirc...

Dyna, 1998

Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...

International Journal of Energy Economics and Policy, 2019

This study discusses the potentialities and current situation of the electricity generation from ... more This study discusses the potentialities and current situation of the electricity generation from non-conventional renewable energy sources (NCRES) in Colombia. In particular, three scenarios considering the increment of NCRES electricity based generation installed capacity are discussed. The three scenarios are compared to the 2020 forecast of the Energy and Mining Planning Unit ((UPME). Overall, it id shown that Colombia has a significant unused NCRES potential, which makes possible to realize the 6% target for NCRE based electricity generation capacity installed by 2020. In particular, the photovoltaic energy is foresee to account for over half of the NCRE mix. Even though the law 1715 is a progress towards integrating NCRE to the National Electric System, more policies and developments are required, to further the NCRE based installed generation capacities.

Los colectores solares de aire constituyen una de las tecnologias mas sencillas de aprovechamient... more Los colectores solares de aire constituyen una de las tecnologias mas sencillas de aprovechamiento de la energia solar, siendo capaces de contribuir a una importante reduccion de la demanda energetica de calefaccion en los edificios. En el presente trabajo, se ha desarrollado un modelo numerico que describe el comportamiento transitorio de un colector solar de aire. Se trata de un modelo 3D basado en una resolucion de acuerdo a un Metodo de Diferencias Finitas (MDF) explicito que ha sido implantado en una herramienta de simulacion en lenguaje C++. Los resultados obtenidos han sido validados con datos experimentales derivados de un estudio de laboratorio previo, considerando distintas condiciones de operacion en terminos de caudal de aire tratado, intensidad radiante incidente y nivel termico del aire exterior. Los valores predichos por el modelo para el salto termico obtenido a la salida del colector, asi como para el rendimiento energetico del mismo, demuestran ser satisfactorios. ...

Producción CientíficaLibro de Excel habilitado para macros para la simulación de los ahorros ener... more Producción CientíficaLibro de Excel habilitado para macros para la simulación de los ahorros energéticos del uso de captadores solares de aire, con rectas de rendimiento experimentales, para la generación de agua caliente sanitaria en un caso de estudio durante período estival en Valladolid (condiciones climáticas establecidas para días tipo de mayo a septiembre). Comprende el modelado del captador, un intercambiador de calor de tubos de cobre aleteados y un tanque de agua de distintas capacidades, conectados conforme a dos posibles configuraciones.Este trabajo forma parte del proyecto de investigación “Evaluación energética y medida del confort térmico en edificios universitarios hacia cero energía, combinando enfriamiento evaporativo indirecto (EI) y estructuras térmicamente activadas (TABS)” cofinanciado por el fondo Europeo de Desarrollo Regional (FEDER) al amparo d ela orden de 25 de febrero de 2016 de la Consejería de Educación de la Junta de Castilla y León [Ref.: VA029U16]

… y técnicas del …, 2005

Información del artículo Aire acondicionado: estudio de los parámetros energéticos que interviene... more Información del artículo Aire acondicionado: estudio de los parámetros energéticos que intervienen en un recuperador de tipo "heat pipe" en sistemas todo aire.

Environmental Engineering Science, 2008

Sustainability, 2021

This paper presents an energy performance assessment on an educational building in Barranquilla, ... more This paper presents an energy performance assessment on an educational building in Barranquilla, Colombia. The electricity consumption performance was assessed using the software DesignBuilder for two different Air Conditioning (AC) systems. The current electricity intensity is 215.3 kWh/m2-year and centralized AC systems with individual fan coils and a water chiller share 66% of the total consumption and lighting at 16%. The simulation of the AC technology change to Variable Refrigerant Flow (VRF) resulted in an improvement of 38% in AC energy intensity with 88 kWh/m2-year and significant savings in electricity consumption and life-cycle cost of AC systems in buildings.

Sustainability, 2020

This study presents the evaluation of the performance and acceptability of thermal comfort by stu... more This study presents the evaluation of the performance and acceptability of thermal comfort by students in the classrooms of a university building with minisplit-type air-conditioning systems, in a tropical climate. To carry out the study, temperature and humidity measurements were recorded, both outside and inside the selected classrooms, while the students were asked to complete thermal surveys on site. The survey model is based on the template proposed by Fanger and it was applied to a total number of 584 students. In each classroom, the Predicted Mean Vote (PMV) and the Predicted Percentage Dissatisfied (PPD) were estimated according to Fanger’s methodology, as well as the Thermal Sensation Vote (TSV) and the Actual Percentage Dissatisfied (APD), which were obtained from the measurements and the surveys. The results of this study showed that the PMV values, although they may vary with the insulation of the clothing, do not affect the TSV. Furthermore, comparing PMV vs. TSV scores...

Building and Environment, 2021

Abstract The selection of the most suitable HVAC technology for buildings, is a complex challenge... more Abstract The selection of the most suitable HVAC technology for buildings, is a complex challenge. Many factors such as, the features of the building, climatic conditions, energy consumption, Indoor Air Quality (IAQ), thermal comfort, regulations, aspects, economic and environmental aspects, all of which are shown on a local and national scope. There is no standard methodology that guarantees a single criterion for the selection of HVAC systems. Therefore, in its solution, as in almost all decision-making problems in the field of engineering, two different aspects are considered, theoretical and practical (Moreno, 2002) [1], thus forming a typical multi-criteria decision problem. This study proposes an integral performance indicator for the selection of air conditioning systems (ACPI), based on the multicriteria method of the Analytic Hierarchy Process (AHP), in order to choose the best HVAC system variant, based on its classification by integrating energy, environmental, and economic criteria. For the definition of the criteria, studies on HVAC system selection were reviewed and classified, applying multi-criteria on methods. The criteria were weighted based on surveys issued by a team made up of Professors/Researchers, architects, engineers, installers and managers linked to the HVAC sector. The ACPI model obtained, shows that the highest weighting corresponds to building energy consumption index 26.6%, IAQ 20.6%, thermal comfort 18.6%, CO2 emissions 12.1%, and finally, investment costs, operation and maintenance costs 11.6% and 10.3% respectively. The proposed ACPI, together with its analysis methodology, will allow researchers, architects, engineers, and government administration, to consider a wide range of alternative HVAC systems applied in buildings. With this, it will be possible to select them based on a decision-making model with a reliable source of information.

Thermo-Active Building Systems (TABS) represent a promising option for building conditioning, bei... more Thermo-Active Building Systems (TABS) represent a promising option for building conditioning, being well-spread in Northern and Central regions of Europe for dominant heating operation, but having a much slower penetration in warmer Southern climatic areas. In this context, the present work aims to evaluate the potential and main implications of such climatic differences on the energy and comfort performance of TABS. Their integrated operation with different cold water generation alternatives and control strategies is considered. Results derived from the whole simulation work developed in TRNSYS 17 reveal important limitations for TABS cooling associated to humidity control issues in the hottest and most humid Mediterranean areas (e.g. Valencia). Nevertheless, other southern locations in the continental climate with quite hot and dry summer conditions (e.g. Madrid) show satisfactory results. Moreover, this work estimates the potential of integrating hydraulic free-cooling provided b...

JCYL - Programa de apoyo a proyectos de investigacion cofinanciadas por el Fondo Europeo de Desar... more JCYL - Programa de apoyo a proyectos de investigacion cofinanciadas por el Fondo Europeo de Desarrollo Regional. jUNTA DE cASTILLA Y lEON. VA029U16

El objetivo es el estudio de la gestión energética ISO 50001, mediante las herramientas de sistem... more El objetivo es el estudio de la gestión energética ISO 50001, mediante las herramientas de sistema de gestión tales como la auditoría energética y compararlo con la certificación energética mediante simulación dinámica, aplicadas a un edificio universitario estándar. La metodología empleada para alcanzar unos resultados de ahorro y eficiencia energética, aplicados a un edificio universitario, pretenden servir de modelo para poder extrapolarlos a edificios que componen los campus universitarios. La metodología sigue el siguiente esquema:

Hoy en día la forma y cantidad en que se satisfacen las necesidades energéticas presentan importa... more Hoy en día la forma y cantidad en que se satisfacen las necesidades energéticas presentan importantes implicaciones en el orden social y económico, pero al mismo tiempo la transformación y consumo de esa energía dan lugar a una agresión al medioambiente ...

Sustainability, 2021

This paper presents an energy performance assessment on an educational building in Barranquilla, ... more This paper presents an energy performance assessment on an educational building in Barranquilla, Colombia. The electricity consumption performance was assessed using the software DesignBuilder for two different Air Conditioning (AC) systems. The current electricity intensity is 215.3 kWh/m2 -year and centralized AC systems with individual fan coils and a water chiller share 66% of the total consumption and lighting at 16%. The simulation of the AC technology change to Variable Refrigerant Flow (VRF) resulted in an improvement of 38% in AC energy intensity with 88 kWh/m2-year and significant savings in electricity consumption and life-cycle cost of AC systems in buildings.

Proceedings, 2019

Ventilated façades are among the existing measures to reduce the energy demand in buildings. The ... more Ventilated façades are among the existing measures to reduce the energy demand in buildings. The combination of this passive heating and cooling strategy with photovoltaics (PV) can drive new buildings towards the current European targets for near or even net zero-energy buildings (nZEB). The present work aims at studying the PV integrated ventilated façade of the nZEB known as “LUCIA” at the University of Valladolid, Spain. First, the transmissivity of the PV façade is measured. Then, the monitoring of the available solar radiation is presented together with the air-dry bulb temperatures indoors, outdoors and inside the ventilated façade. The experimental results permit the validation of a mathematical model that describes the behaviour of the ventilated façade in its current operating modes. The results show that dampers should be closed during winter to let the façade act as a further insulation for outdoor temperatures below 18.4 C to improve energy efficiency. Indoor air recirc...

Dyna, 1998

Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...

International Journal of Energy Economics and Policy, 2019

This study discusses the potentialities and current situation of the electricity generation from ... more This study discusses the potentialities and current situation of the electricity generation from non-conventional renewable energy sources (NCRES) in Colombia. In particular, three scenarios considering the increment of NCRES electricity based generation installed capacity are discussed. The three scenarios are compared to the 2020 forecast of the Energy and Mining Planning Unit ((UPME). Overall, it id shown that Colombia has a significant unused NCRES potential, which makes possible to realize the 6% target for NCRE based electricity generation capacity installed by 2020. In particular, the photovoltaic energy is foresee to account for over half of the NCRE mix. Even though the law 1715 is a progress towards integrating NCRE to the National Electric System, more policies and developments are required, to further the NCRE based installed generation capacities.

Los colectores solares de aire constituyen una de las tecnologias mas sencillas de aprovechamient... more Los colectores solares de aire constituyen una de las tecnologias mas sencillas de aprovechamiento de la energia solar, siendo capaces de contribuir a una importante reduccion de la demanda energetica de calefaccion en los edificios. En el presente trabajo, se ha desarrollado un modelo numerico que describe el comportamiento transitorio de un colector solar de aire. Se trata de un modelo 3D basado en una resolucion de acuerdo a un Metodo de Diferencias Finitas (MDF) explicito que ha sido implantado en una herramienta de simulacion en lenguaje C++. Los resultados obtenidos han sido validados con datos experimentales derivados de un estudio de laboratorio previo, considerando distintas condiciones de operacion en terminos de caudal de aire tratado, intensidad radiante incidente y nivel termico del aire exterior. Los valores predichos por el modelo para el salto termico obtenido a la salida del colector, asi como para el rendimiento energetico del mismo, demuestran ser satisfactorios. ...

Producción CientíficaLibro de Excel habilitado para macros para la simulación de los ahorros ener... more Producción CientíficaLibro de Excel habilitado para macros para la simulación de los ahorros energéticos del uso de captadores solares de aire, con rectas de rendimiento experimentales, para la generación de agua caliente sanitaria en un caso de estudio durante período estival en Valladolid (condiciones climáticas establecidas para días tipo de mayo a septiembre). Comprende el modelado del captador, un intercambiador de calor de tubos de cobre aleteados y un tanque de agua de distintas capacidades, conectados conforme a dos posibles configuraciones.Este trabajo forma parte del proyecto de investigación “Evaluación energética y medida del confort térmico en edificios universitarios hacia cero energía, combinando enfriamiento evaporativo indirecto (EI) y estructuras térmicamente activadas (TABS)” cofinanciado por el fondo Europeo de Desarrollo Regional (FEDER) al amparo d ela orden de 25 de febrero de 2016 de la Consejería de Educación de la Junta de Castilla y León [Ref.: VA029U16]

… y técnicas del …, 2005

Información del artículo Aire acondicionado: estudio de los parámetros energéticos que interviene... more Información del artículo Aire acondicionado: estudio de los parámetros energéticos que intervienen en un recuperador de tipo "heat pipe" en sistemas todo aire.

Environmental Engineering Science, 2008

Sustainability, 2021

This paper presents an energy performance assessment on an educational building in Barranquilla, ... more This paper presents an energy performance assessment on an educational building in Barranquilla, Colombia. The electricity consumption performance was assessed using the software DesignBuilder for two different Air Conditioning (AC) systems. The current electricity intensity is 215.3 kWh/m2-year and centralized AC systems with individual fan coils and a water chiller share 66% of the total consumption and lighting at 16%. The simulation of the AC technology change to Variable Refrigerant Flow (VRF) resulted in an improvement of 38% in AC energy intensity with 88 kWh/m2-year and significant savings in electricity consumption and life-cycle cost of AC systems in buildings.

Sustainability, 2020

This study presents the evaluation of the performance and acceptability of thermal comfort by stu... more This study presents the evaluation of the performance and acceptability of thermal comfort by students in the classrooms of a university building with minisplit-type air-conditioning systems, in a tropical climate. To carry out the study, temperature and humidity measurements were recorded, both outside and inside the selected classrooms, while the students were asked to complete thermal surveys on site. The survey model is based on the template proposed by Fanger and it was applied to a total number of 584 students. In each classroom, the Predicted Mean Vote (PMV) and the Predicted Percentage Dissatisfied (PPD) were estimated according to Fanger’s methodology, as well as the Thermal Sensation Vote (TSV) and the Actual Percentage Dissatisfied (APD), which were obtained from the measurements and the surveys. The results of this study showed that the PMV values, although they may vary with the insulation of the clothing, do not affect the TSV. Furthermore, comparing PMV vs. TSV scores...

Building and Environment, 2021

Abstract The selection of the most suitable HVAC technology for buildings, is a complex challenge... more Abstract The selection of the most suitable HVAC technology for buildings, is a complex challenge. Many factors such as, the features of the building, climatic conditions, energy consumption, Indoor Air Quality (IAQ), thermal comfort, regulations, aspects, economic and environmental aspects, all of which are shown on a local and national scope. There is no standard methodology that guarantees a single criterion for the selection of HVAC systems. Therefore, in its solution, as in almost all decision-making problems in the field of engineering, two different aspects are considered, theoretical and practical (Moreno, 2002) [1], thus forming a typical multi-criteria decision problem. This study proposes an integral performance indicator for the selection of air conditioning systems (ACPI), based on the multicriteria method of the Analytic Hierarchy Process (AHP), in order to choose the best HVAC system variant, based on its classification by integrating energy, environmental, and economic criteria. For the definition of the criteria, studies on HVAC system selection were reviewed and classified, applying multi-criteria on methods. The criteria were weighted based on surveys issued by a team made up of Professors/Researchers, architects, engineers, installers and managers linked to the HVAC sector. The ACPI model obtained, shows that the highest weighting corresponds to building energy consumption index 26.6%, IAQ 20.6%, thermal comfort 18.6%, CO2 emissions 12.1%, and finally, investment costs, operation and maintenance costs 11.6% and 10.3% respectively. The proposed ACPI, together with its analysis methodology, will allow researchers, architects, engineers, and government administration, to consider a wide range of alternative HVAC systems applied in buildings. With this, it will be possible to select them based on a decision-making model with a reliable source of information.

Thermo-Active Building Systems (TABS) represent a promising option for building conditioning, bei... more Thermo-Active Building Systems (TABS) represent a promising option for building conditioning, being well-spread in Northern and Central regions of Europe for dominant heating operation, but having a much slower penetration in warmer Southern climatic areas. In this context, the present work aims to evaluate the potential and main implications of such climatic differences on the energy and comfort performance of TABS. Their integrated operation with different cold water generation alternatives and control strategies is considered. Results derived from the whole simulation work developed in TRNSYS 17 reveal important limitations for TABS cooling associated to humidity control issues in the hottest and most humid Mediterranean areas (e.g. Valencia). Nevertheless, other southern locations in the continental climate with quite hot and dry summer conditions (e.g. Madrid) show satisfactory results. Moreover, this work estimates the potential of integrating hydraulic free-cooling provided b...

JCYL - Programa de apoyo a proyectos de investigacion cofinanciadas por el Fondo Europeo de Desar... more JCYL - Programa de apoyo a proyectos de investigacion cofinanciadas por el Fondo Europeo de Desarrollo Regional. jUNTA DE cASTILLA Y lEON. VA029U16

El objetivo es el estudio de la gestión energética ISO 50001, mediante las herramientas de sistem... more El objetivo es el estudio de la gestión energética ISO 50001, mediante las herramientas de sistema de gestión tales como la auditoría energética y compararlo con la certificación energética mediante simulación dinámica, aplicadas a un edificio universitario estándar. La metodología empleada para alcanzar unos resultados de ahorro y eficiencia energética, aplicados a un edificio universitario, pretenden servir de modelo para poder extrapolarlos a edificios que componen los campus universitarios. La metodología sigue el siguiente esquema:

Hoy en día la forma y cantidad en que se satisfacen las necesidades energéticas presentan importa... more Hoy en día la forma y cantidad en que se satisfacen las necesidades energéticas presentan importantes implicaciones en el orden social y económico, pero al mismo tiempo la transformación y consumo de esa energía dan lugar a una agresión al medioambiente ...

Sustainability, 2021

This paper presents an energy performance assessment on an educational building in Barranquilla, ... more This paper presents an energy performance assessment on an educational building in Barranquilla, Colombia. The electricity consumption performance was assessed using the software DesignBuilder for two different Air Conditioning (AC) systems. The current electricity intensity is 215.3 kWh/m2 -year and centralized AC systems with individual fan coils and a water chiller share 66% of the total consumption and lighting at 16%. The simulation of the AC technology change to Variable Refrigerant Flow (VRF) resulted in an improvement of 38% in AC energy intensity with 88 kWh/m2-year and significant savings in electricity consumption and life-cycle cost of AC systems in buildings.