Francisco Alberto Ramirez Rivera

@pucmm.edu.do

Faculty of Engineering Sciences,
Engineering Sciences, Pontificia Universidad Católica Madre y Maestra (PUCMM);

Graduated from the industrial engineering program at the Universidad Autónoma de Santo Domingo (UASD) in 2008. He received the Ph.D degrees in renewable energy from The Polytechnic University of Cartagena(Murcia, Spain), in 2015. He is currently associate professor of Engineering Faculty of the Pontificia Universidad Católica Madre y Maestra in the Dominican Republic. His is research interest includes heat transfer for buildings, enhance heat transfer for HVAC applications, solar thermal using nanofluids, energy forecast with new intelligent tools (machine learning and deep learning).

EDUCATION

-Ph.D Energías Renovables, Universidad Politécnica de Cartagena(UPCT), Murcia (España) 2015,
-Ingeniero industrial, Universidad Autónoma de Santo Domingo(UASD), Rep. Dominicana, 2008

RESEARCH, TEACHING, or OTHER INTERESTS

Renewable Energy, Sustainability and the Environment, Engineering, Building and Construction, Fluid Flow and Transfer Processes

Scopus Publications

Scholar Citations

Scholar h-index

Scholar i10-index

Scopus Publications

Harmonic distortion caused by non-linear household loads: Measurement and modelling
Vrindarani Nuñez-Ramírez, Néstor F. Guerrero-Rodríguez, Rafael Omar Batista-Jorge, Robert Mercado-Ravelo, F.A. Ramírez-Rivera, Julio A. Ferreira, and Rubén D. Ramos-Ciprian
Elsevier BV

Modelling real non-linear loads for a Controller Hardware-in-the-Loop configuration to evaluate a Shunt Active Power Filter
N.F. Guerrero-Rodríguez, Vrindarani Nuñez-Ramírez, Rafael Omar Batista-Jorge, Robert Mercado-Ravelo, F.A. Ramírez-Rivera, Julio A. Ferreira, and Enrique Reyes-Archundia
Elsevier BV

Ensemble Learning Algorithms for Solar Radiation Prediction in Santo Domingo: Measurements and Evaluation
Francisco A. Ramírez-Rivera and Néstor F. Guerrero-Rodríguez
MDPI AG
Solar radiation is a fundamental parameter for solar photovoltaic (PV) technology. Reliable solar radiation prediction has become valuable for designing solar PV systems, guaranteeing their performance, operational efficiency, safety in operations, grid dispatchment, and financial planning. However, high quality ground-based solar radiation measurements are scarce, especially for very short-term time horizons. Most existing studies trained machine learning (ML) models using datasets with time horizons of 1 h or 1 day, whereas very few studies reported using a dataset with a 1 min time horizon. In this study, a comprehensive evaluation of nine ensemble learning algorithms (ELAs) was performed to estimate solar radiation in Santo Domingo with a 1 min time horizon dataset, collected from a local weather station. The ensemble learning models evaluated included seven homogeneous ensembles: Random Forest (RF), Extra Tree (ET), adaptive gradient boosting (AGB), gradient boosting (GB), extreme gradient boosting (XGB), light gradient boosting (LGBM), histogram-based gradient boosting (HGB); and two heterogeneous ensembles: voting and stacking. RF, ET, GB, and HGB were combined to develop voting and stacking ensembles, with linear regression (LR) being adopted in the second layer of the stacking ensemble. Six technical metrics, including mean squared error (MSE), root mean squared error (RMSE), relative root mean squared error (rRMSE), mean absolute error (MAE), mean absolute percentage error (MAPE), and coefficient of determination (R2), were used as criteria to determine the prediction quality of the developed ensemble algorithms. A comparison of the results indicates that the HGB algorithm offers superior prediction performance among the homogeneous ensemble learning models, while overall, the stacking ensemble provides the best accuracy, with metric values of MSE = 3218.27, RMSE = 56.73, rRMSE = 12.700, MAE = 29.87, MAPE = 10.60, and R2 = 0.964.

An Overview of the Efficiency and Long-Term Viability of Powered Hydrogen Production
Nestor F. Guerrero-Rodríguez, Daniel A. De La Rosa-Leonardo, Ricardo Tapia-Marte, Francisco A. Ramírez-Rivera, Juan Faxas-Guzmán, Alexis B. Rey-Boué, and Enrique Reyes-Archundia
MDPI AG
This work studies the efficiency and long-term viability of powered hydrogen production. For this purpose, a detailed exploration of hydrogen production techniques has been undertaken, involving data collection, information authentication, data organization, and analysis. The efficiency trends, environmental impact, and hydrogen production costs in a landscape marked by limited data availability were investigated. The main contribution of this work is to reduce the existing data gap in the field of hydrogen production by compiling and summarizing dispersed data. The findings are expected to facilitate the decision-making process by considering regional variations, energy source availability, and the potential for technological advancements that may further enhance the economic viability of electrolysis. The results show that hydrogen production methods can be identified that do not cause significant harm to the environment. Photolysis stands out as the least serious offender, producing 0 kg of CO2 per kg of H2, while thermolysis emerges as the major contributor to emissions, with 20 kg of CO2 per kg of H2 produced.

Harmonic Distortion Study of a Photovoltaic Generator in a Microgrid under Disturbances
Nestor F. Guerrero-Rodríguez, Rafael Omar Batista-Jorge, Francisco A. Ramírez-Rivera, Julio Ferreira, Robert Mercado-Ravelo, and Abraham Manilla
MDPI AG
This paper describes research on the harmonic-distortion capacity of a single-stage photovoltaic (PV) 3.68 kWp generator in a microgrid configuration. An overview of various harmonic compensator methods used in PV generators is presented to evaluate their advantages and disadvantages. Proportional-resonant (PR) structures with harmonic compensators (HCs) are designed, modeled, and validated through real-time tests. The modeling of harmonic compensation structures for a photovoltaic inverter using MATLAB/SIMULINK R2022a is explained in detail. The harmonic compensation capacity of a PV generator inverter is studied under voltage harmonics, grid frequency variation, and voltage unbalance. The contributions of this work are, firstly a bibliographic analysis of various strategies currently used for harmonic compensation in grid-connected inverters and secondly, a detailed explanation of the modeling of harmonic compensation structures using MATLAB/SIMULINK. Finally, a demonstration of the improvement in energy quality that results from using harmonic compensation techniques in photovoltaic generators in microgrid configurations affected by grid disturbances is performed. The obtained results show that harmonic compensation strategies based on resonant filters are a good alternative for the reduction of harmonic voltage distortion in the presence of grid disturbances such as frequency variation and voltage unbalance.

ANALYSIS OF THERMAL COMFORT BETWEEN A LIGHTWEIGHT INDUSTRIALIZED SOLUTION VERSUS THE TRADITIONAL TECHNIQUE OF BUILDING CONSTRUCTION IN THE DOMINICAN REPUBLIC: MONITORING

FRICTIONAL PRESSURE DROP DURING CONDENSING FLOW INSIDE MINI/MICRO-CHANNELS: PREDICTIVE TOOLS ASSESSMENT AND DATA TREATMENT
FRANCISCO ALBERTO RAMIREZ RIVERA, NESTOR GUERRERO RODRIGUEZ, YOKASTA INMACULADA GARCIA FROMETA, and ALISON SANCHEZ GARCIA
UK Zhende Publishing Limited Company
A total of 1210 new condensation friction pressure gradient points (database) is collected from 12 open articles on mini/micro-channels literature. The database covered a wide range of thermophysical properties associated with low-GWP refrigerants, physical dimension, mass velocity and vapor quality. A comparison of the experimental database against eleven two-phase flow frictional pressure drop prediction tools is carried out. Based on that, the mini/micro-channel developed by Xu and Fang exhibited the best ability to capture the tendency of the database with a mean absolute relative deviation of (36.59%) for all data. Keywords: Two-phase flow frictional pressure gradient; Mini/micro-channels; Condensing flow; New refrigerant fluid; Heat transfer; Collect database.

Thermal performance of facades based on experimental monitoring of outdoor test cells in tropical climate
Letzai Ruiz-Valero, Juan Faxas-Guzmán, Julio Ferreira, Victor González, Néstor Guerrero, and Francisco Ramirez
Ital Publication
The high cost of energy consumption in buildings highlights the importance of research focused on improving the energy efficiency of building’s envelope systems. It is important to characterize the real behavior of these systems to know the effectiveness in terms of energy reduction. Therefore, the aim of this paper is to characterize the thermal performance of facades based on experimental monitoring of outdoor test cells in tropical climate. To carry out this research, a case study was presented to compare two construction systems. One of them is a light façade (M1) and the other a reference façade (M2). A thermal simulation was performed for the opaque and glazed facades. In addition, several parameters were measured with different types of sensors, as well as environmental variables to evaluate the thermal and lighting behavior of multiple facades systems under real conditions. The findings show that light façade behavior was the opposite of what was expected, since by incorporating a window in the façade it has allowed solar radiation to increase the interior temperature in both modules. In the case of the light facade the penalization was higher than the reference facade, which has a lower thermal transmittance than M1. Doi: 10.28991/cej-2021-03091773 Full Text: PDF

Experimental investigation of thermal conductivity from insulation based on rice hulks: Guarded and calibrated hot box method
Yokasta García Frómeta, Francisco Ramírez Rivera, Víctor González Holguín, and Jesús Cuadrado
Trans Tech Publications, Ltd.
In developing countries, large quantities of agricultural residues associated with harvests are generated, given that agriculture is one of the most important economic activities. The valorization of these residues for the construction sector could contribute to the improvement of energy efficiency in buildings. Through passive techniques, the construction of insulating thermal-acoustics panels, blocks, and aggregate for reinforced concrete can improve the energy efficiency. In this study, an experiment was performed to measure thermal conductivity of the Agricultural-Thermal Insulation Panel (ATIP) based on rice hulks. These Agricultural-Thermal Insulation Panels were elaborated follow a standard process to compaction of the rice hulks to be employed as insulation material with a panel dimension of 200x200x34.5(mm3). A “Hot Box” configuration was used to obtain the thermal conductivity of the panels, using different temperature gradients between hot and cold chambers.

Performance comparison of an air/water heat pump using a minichannel coil as evaporator in replacement of a fin-and-tube heat exchanger
J.R. García-Cascales, F. Illán-Gómez, F. Hidalgo-Mompeán, F.A. Ramírez-Rivera, and M.A. Ramírez-Basalo
Elsevier BV

Two phase flow pressure drop in multiport mini-channel tubes using R134a and R32 as working fluids
Francisco Ramírez-Rivera, Alejandro López-Belchí, Francisco Vera-García, J.R. García-Cascales, and Fernando Illán-Gómez
Elsevier BV

RECENT SCHOLAR PUBLICATIONS

Modelling real non-linear loads for a Controller Hardware-in-the-Loop configuration to evaluate a Shunt Active Power Filter
NF Guerrero-Rodrguez, V Nuez-Ramrez, RO Batista-Jorge, ...
Energy Reports 12, 1947-1976 2024

Ensemble Learning Algorithms for Solar Radiation Prediction in Santo Domingo: Measurements and Evaluation
FA Ramrez-Rivera, NF Guerrero-Rodrguez
Preprints 2024

An Overview of the Efficiency and Long-Term Viability of Powered Hydrogen Production
NF Guerrero-Rodrguez, DA De La Rosa-Leonardo, R Tapia-Marte, ...
Sustainability 16 (13), 5569 2024

Harmonic Distortion Study of a Photovoltaic Generator in a Microgrid under Disturbances
NF Guerrero-Rodrguez, RO Batista-Jorge, FA Ramrez-Rivera, J Ferreira, ...
Energies 17 (9), 2031 2024

FRICTIONAL PRESSURE DROP DURING CONDENSING FLOW INSIDE MINI/MICRO-CHANNELS: PREDICTIVE TOOLS ASSESSMENT AND DATA TREATMENT.
FA Ramrez-Rivera, NF Guerrero-Rodrguez, YI Garca-Frometa, ...
DYNA-Ingeniera e Industria 98 (4) 2023

Cada de presin por friccin durante el flujo de condensacin en el interior de mini/microcanales: evaluacin de herramientas predictivas y tratamiento de datos: Frictional
FA Ramrez-Rivera
DYNA Publishing 98 (4), 375-383 2023

Thermal performance of facades based on experimental monitoring of outdoor test cells in tropical climate
L Ruiz-Valero, J Faxas-Guzmn, J Ferreira, V Gonzlez, N Guerrero, ...
Civil Engineering Journal 7 (12), 1982-1997 2021

Experimental Investigation of Thermal Conductivity from Insulation Based on Rice Hulks: Guarded and Calibrated Hot Box Method
YG Frmeta, FR Rivera, VG Holgun, J Cuadrado
Materials Science Forum 1046, 71-76 2021

Performance comparison of an air/water heat pump using a minichannel coil as evaporator in replacement of a fin-and-tube heat exchanger
JR Garca-Cascales, F Illn-Gmez, F Hidalgo-Mompen, ...
International Journal of Refrigeration 74, 560-575 2017

Cada de presin y transferencia de calor durante el proceso de ebullicin saturada en el interior de un tubo multipuerto con minicanales
FV Garca, AL Belch, FAR Rivera
VIII Congreso Ibrico| VI Congreso Iberoamericano de las Ciencias y Tcnicas 2016

ESTUDIO DE UNA BOMBA DE CALOR AIRE/AGUA FUNCIONANDO CON UN INTERCAMBIADOR COMPACTO O UN INTERCAMBIADOR DE TUBO ALETEADO
MARB J.R. Garca-Cascales, F. Illn-Gmez, F. Hidalgo-Mompen, F.A. Ramrez ...
CYTEF 2016 − VIII Congreso Ibrico | VI Congreso Iberoamericano de las 2016

CADA DE PRESIN Y TRANSFERENCIA DE CALOR DURANTE EL PROCESO DE EBULLICIN SATURADA EN EL INTERIOR DE UN TUBO MULTIPUERTO CON MINICANALES.
FA Ramrez-Rivera, F Vera-Garca, A Lpez-Belch
2016

Two phase flow pressure drop in multiport mini-channel tubes using R134a and R32 as working fluids
F Ramirez-Rivera, A Lopez-Belchi, F Vera-Garcia, JR Garca-Cascales, ...
International journal of Thermal sciences 92, 17-33 2015

Estudio del proceso de ebullicin en el interior de un tubo multipuerto extruido en aluminio con mini-canales de geometra triangular usando R32 y R134a como fluidos de trabajo
FAR Rivera
Universidad Politecnica de Cartagena (Spain) 2015

CADA DE PRESIN DURANTE EL PROCESO DE EBULLICIN SATURADA EN EL INTERIOR DE UN TUBO MULTIPUERTO CON MINI-CANALES USANDO R32 COMO FLUIDO DE TRABAJO.
F Ramrez-Rivera, F Vera-Garca, JR Garca-Cascales
2015

Estudio del proceso de ebullicion en el interior de un tubo multipuerto extruido en aluminio con mini-canales de geometria triangular usando R32 y R134a como fluidos de trabajo
FA Ramirez Rivera
Ph. D. Thesis 2015

Flow boiling heat transfer and pressure drop in multiport tube using R134a and R32
F Ramrez-Rivera, F Vera-Garca, JR Garca-Cascales, F Illn-Gmez
VII Ibero-American Congress of Refrigeration Science and Technologies 2014

Flow boiling heat transfer and pressure drop in multiport tube using R134a and R32
FIFI F.A. Ramrez-Rivera, F. Vera-Garca, F. Vera-Garca, Jos R. Garca ...
VII Ibero-American Congress of Refrigeration Science and Technologies (CYTEF 2014

Two-Phase Flow Pressure Drop of R1234YF and R134A in a Mini-Channel Multiport Tube
F Vera-Garcia, A Lopez-Belchi, F Ramirez-Rivera, JR Garcia-Cascales, ...
International Heat Transfer Conference Digital Library 2014

Flow Boiling Heat Transfer in Small Cross Section Area Tubes with R134a and R32
F Ramirez-Rivera, F Vera-Garcia, JR Garcia-Cascales, F Illan-Gomez
International Heat Transfer Conference Digital Library 2014

MOST CITED SCHOLAR PUBLICATIONS

Ensemble Learning Algorithms for Solar Radiation Prediction in Santo Domingo: Measurements and Evaluation
FA Ramrez-Rivera, NF Guerrero-Rodrguez
Preprints 2024
Citations: 2

Harmonic Distortion Study of a Photovoltaic Generator in a Microgrid under Disturbances
NF Guerrero-Rodrguez, RO Batista-Jorge, FA Ramrez-Rivera, J Ferreira, ...
Energies 17 (9), 2031 2024
Citations: 2

Cada de presin en minicanales operando con R134a en monofsico y procesos de condensacin, 2012
F Vera-Garcia, JR Garcia-Cascales, A Lopez-Belchi, FA Ramirez-Rivera
Conference Proceeding. VI Congreso Ibrico y V Congreso Iberoamericano de
Citations: 2

An Overview of the Efficiency and Long-Term Viability of Powered Hydrogen Production
NF Guerrero-Rodrguez, DA De La Rosa-Leonardo, R Tapia-Marte, ...
Sustainability 16 (13), 5569 2024
Citations: 1

Implementacin de una red neuronal para la prediccin de la cada de presin en minicanales
AL Belch, FAR Rivera, JRG Cascales, FV Garca, FI Gmez, ...
VIII Congreso Nacional de Ingeniera Termodinmica.[Recurso electrnico 2013
Citations: 1