This page has only limited features, please log in for full access.

Unclaimed
Javier M. Rey-Hernández
Department of Energy and Fluid Mechanics, Engineering School (EII), University of Valladolid, Paseo del Cauce 59, 47011, Valladolid, Spain

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 06 July 2021 in Sustainability
Reads 0
Downloads 0

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.

ACS Style

Milen Balbis-Morejón; Juan Cabello-Eras; Javier Rey-Hernández; Francisco Rey-Martínez. Energy Evaluation and Energy Savings Analysis with the 2 Selection of AC Systems in an Educational Building. Sustainability 2021, 13, 7527 .

AMA Style

Milen Balbis-Morejón, Juan Cabello-Eras, Javier Rey-Hernández, Francisco Rey-Martínez. Energy Evaluation and Energy Savings Analysis with the 2 Selection of AC Systems in an Educational Building. Sustainability. 2021; 13 (14):7527.

Chicago/Turabian Style

Milen Balbis-Morejón; Juan Cabello-Eras; Javier Rey-Hernández; Francisco Rey-Martínez. 2021. "Energy Evaluation and Energy Savings Analysis with the 2 Selection of AC Systems in an Educational Building." Sustainability 13, no. 14: 7527.

Journal article
Published: 26 June 2021 in Building and Environment
Reads 0
Downloads 0

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.

ACS Style

Milen Balbis-Morejón; Juan José Cabello-Eras; Javier M. Rey-Hernández; Francisco Javier Rey-Martínez. Global Air Conditioning Performance Indicator (ACPI) for buildings, in tropical climate. Building and Environment 2021, 203, 108071 .

AMA Style

Milen Balbis-Morejón, Juan José Cabello-Eras, Javier M. Rey-Hernández, Francisco Javier Rey-Martínez. Global Air Conditioning Performance Indicator (ACPI) for buildings, in tropical climate. Building and Environment. 2021; 203 ():108071.

Chicago/Turabian Style

Milen Balbis-Morejón; Juan José Cabello-Eras; Javier M. Rey-Hernández; Francisco Javier Rey-Martínez. 2021. "Global Air Conditioning Performance Indicator (ACPI) for buildings, in tropical climate." Building and Environment 203, no. : 108071.

Journal article
Published: 07 November 2020 in Electronics
Reads 0
Downloads 0

The challenge of photovoltaic integration as the basis of an energy generation system has been achieved and carried out by the University Autónoma de Cali, Colombia, using an avant-garde energy technology model. This innovative sustainable campus not only fulfills its purpose as an advanced model of a renewable energy integration system, it also aims at environmental research, e-mobility, and energy efficiency. This paper describes how the university implements the technological innovation of integrating the photovoltaic system installation in a university campus, showing its relevant contribution to the electricity generation in the campus buildings by analyzing the different electrical parameters together with the system performance indicators. The implementation of technological solutions has allowed the generation of a quantity of renewable energy within the campus, supplying a sustainable energy response based on energy efficiency and carbon emissions savings. This innovation has been applied following the international standards for the evaluation of the energy performance of photovoltaic systems (IEC 61724), reaching very optimal values for this type of renewable solution. In this paper, the dynamic monitoring of several parameters has been carried out in order to analyze the energy performance, and an energy simulation has been used to achieve optimal solutions and to obtain the perfect modeling of the system. This study shows how to evaluate the performance of an integration of a photovoltaic system in a smart university campus, according to international standards. It achieves complete viability due to its economic savings, energy efficiency and reduction of carbon emission.

ACS Style

Rosaura Castrillón-Mendoza; Paul Andrés Manrique-Castillo; Javier M. Rey-Hernández; Francisco J. Rey-Martínez; Gabriel González-Palomino. PV Energy Performance in a Sustainable Campus. Electronics 2020, 9, 1874 .

AMA Style

Rosaura Castrillón-Mendoza, Paul Andrés Manrique-Castillo, Javier M. Rey-Hernández, Francisco J. Rey-Martínez, Gabriel González-Palomino. PV Energy Performance in a Sustainable Campus. Electronics. 2020; 9 (11):1874.

Chicago/Turabian Style

Rosaura Castrillón-Mendoza; Paul Andrés Manrique-Castillo; Javier M. Rey-Hernández; Francisco J. Rey-Martínez; Gabriel González-Palomino. 2020. "PV Energy Performance in a Sustainable Campus." Electronics 9, no. 11: 1874.

Journal article
Published: 26 October 2020 in Sustainability
Reads 0
Downloads 0

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, a 2 °C to 3 °C difference in operating temperature was found, whereby the thermal sensitivity for TSV was colder, so it could be assumed that the PMV model overestimates the thermal sensitivity of students in low-temperature conditions. In addition, an acceptability by 90% with thermal preferences between 23 °C and 24 °C were also found. These results indicate that it is possible to increase the temperature set point in minisplit-type air-conditioning system from 4 °C to 7 °C with respect to the currently set temperatures, without affecting the acceptability of the thermal environment to the students in the building.

ACS Style

Milen Balbis-Morejón; Javier Rey-Hernández; Carlos Amaris-Castilla; Eloy Velasco-Gómez; Julio San José-Alonso; Francisco Rey-Martínez. Experimental Study and Analysis of Thermal Comfort in a University Campus Building in Tropical Climate. Sustainability 2020, 12, 8886 .

AMA Style

Milen Balbis-Morejón, Javier Rey-Hernández, Carlos Amaris-Castilla, Eloy Velasco-Gómez, Julio San José-Alonso, Francisco Rey-Martínez. Experimental Study and Analysis of Thermal Comfort in a University Campus Building in Tropical Climate. Sustainability. 2020; 12 (21):8886.

Chicago/Turabian Style

Milen Balbis-Morejón; Javier Rey-Hernández; Carlos Amaris-Castilla; Eloy Velasco-Gómez; Julio San José-Alonso; Francisco Rey-Martínez. 2020. "Experimental Study and Analysis of Thermal Comfort in a University Campus Building in Tropical Climate." Sustainability 12, no. 21: 8886.

Journal article
Published: 10 September 2020 in Building and Environment
Reads 0
Downloads 0

In this research paper, an analysis is developed on the performance of a hybrid ventilation system that combines Earth-to-Air Heat eXchangers (EAHX), free cooling and evaporative cooling Air Handling Unit Heat eXchanger (AHU-HX), all being controlled by a Building Management System (BMS) in a net Zero Energy Building (nZEB), called LUCIA. LUCIA nZEB is the first safe-building against Covid-19 in the world, certified by the international organisation WOSHIE, and located in Valladolid, Spain. The main aim is to optimize the performance of the three systems in such a way that the Indoor Air Quality (IAQ) levels remain within the allowable limits, while maximizing the use of natural resources and minimizing energy consumption and carbon emissions. The approach to satisfy the heating and cooling demand and IAQ levels through zero emissions energy systems is developed, thus anticipating the zero-energy target, set by the European Union for 2050. Results showed that the installed hybrid ventilation system uses heat exchangers for 70% of the operational time, in order to achieve the set parameters successfully. Also, the analysis made by monitoring data, have shown that the control and optimal operation of the hybrid ventilation system allows high energy recovery values with minimum additional electricity consumption. Significant reduction of carbon emissions and operational costs have been achieved.

ACS Style

Javier M. Rey-Hernández; Julio F. San José-Alonso; Eloy Velasco-Gómez; Charles Yousif; Francisco J. Rey-Martínez. Performance analysis of a hybrid ventilation system in a near zero energy building. Building and Environment 2020, 185, 107265 -107265.

AMA Style

Javier M. Rey-Hernández, Julio F. San José-Alonso, Eloy Velasco-Gómez, Charles Yousif, Francisco J. Rey-Martínez. Performance analysis of a hybrid ventilation system in a near zero energy building. Building and Environment. 2020; 185 ():107265-107265.

Chicago/Turabian Style

Javier M. Rey-Hernández; Julio F. San José-Alonso; Eloy Velasco-Gómez; Charles Yousif; Francisco J. Rey-Martínez. 2020. "Performance analysis of a hybrid ventilation system in a near zero energy building." Building and Environment 185, no. : 107265-107265.

Journal article
Published: 02 May 2020 in Energies
Reads 0
Downloads 0

The high energy consumption of cooling systems justifies the need for strategies to increase the efficiency of the facilities, in order to reduce the related CO2 emissions. This study aims to improve the performance and reduce the energy consumption of an 8.6 MW air cooled chiller. This installed capacity is biased due to the screw compressors, of 2.98 Energy Efficiency Ratio (EER) at full load (characteristics provided by the manufacturer). The chiller unit has been modified by placing evaporating cooling pads before the condensing coils. The chiller has been monitored for three months, recording over 544,322 measurements (5 min-step data), with and without the evaporative cooling pads, to assess the performance. Data comparison has been done by selecting two days (with and without evaporative panels) with the same health care load and temperatures. Implementing the proposed strategy yields an improvement in the European Seasonal Energy Efficiency Ratio (ESEER) from 3.69 to 4.83, while the Total Equivalent Warming Impact (TEWI) decreases about 1000 tCO2. Energy savings of up to 32.6 MWh result into a payback period lower than 2 years.

ACS Style

Francisco J. Rey Martínez; Julio F. San José Alonso; Eloy Velasco Gómez; Ana Tejero González; Paula M Esquivias; Javier M. Rey Hernández. Energy Consumption Reduction of a Chiller Plant by Adding Evaporative Pads to Decrease Condensation Temperature. Energies 2020, 13, 2218 .

AMA Style

Francisco J. Rey Martínez, Julio F. San José Alonso, Eloy Velasco Gómez, Ana Tejero González, Paula M Esquivias, Javier M. Rey Hernández. Energy Consumption Reduction of a Chiller Plant by Adding Evaporative Pads to Decrease Condensation Temperature. Energies. 2020; 13 (9):2218.

Chicago/Turabian Style

Francisco J. Rey Martínez; Julio F. San José Alonso; Eloy Velasco Gómez; Ana Tejero González; Paula M Esquivias; Javier M. Rey Hernández. 2020. "Energy Consumption Reduction of a Chiller Plant by Adding Evaporative Pads to Decrease Condensation Temperature." Energies 13, no. 9: 2218.

Journal article
Published: 04 March 2020 in Sustainability
Reads 0
Downloads 0

The main target of climate change policies in the majority of industrialized countries is to reduce energy consumption in their facilities, which would reduce the carbon emissions that are generated. Through this idea, energy management plans are developed, energy reduction targets are established, and energy-efficient technologies are applied to achieve high energy savings, which are environmentally compatible. In order to evaluate the impact of their operations and investments, companies promote measures of performance in their energy management plans. An integral part of measuring energy performance is the establishment of energy baselines applicable to the complete facility that provide a basis for evaluating energy efficiency improvements and incorporating energy performance indicators. The implementation of energy management systems in accordance with the requirements of ISO Standard 50001 is a contribution to the aim and strategies for improving cleaner production in industries. This involves an option for the industry to establish energy benchmarks to evaluate performance, predict energy consumption, and align production with the lowest possible consumption of primary and secondary forms of energy. Ultimately, this goal should lead to the manufacturing of cleaner products that are environmentally friendly, energy efficient, and are in accordance with the global environmental targets of cleaner manufacturing. This paper discusses an alternative for establishing energy baselines for the industrial sector in which several products are produced from a single raw material, and we determined the energy consumption of each product and its impact on the overall efficiency of the industry at the same time. The method is applied to the plastic injection process and the result is an energy baseline (EBL) in accordance with the requirements of ISO 50001, which serves as a reference for determining energy savings. The EBL facilitates a reduction in energy consumption and greenhouse gas emissions in sectors such as plastics, a sector which accounts for 15% of Colombia’s manufacturing GDP.

ACS Style

Rosaura Castrillón-Mendoza; Javier M. Rey-Hernández; Francisco J. Rey-Martínez. Industrial Decarbonization by a New Energy-Baseline Methodology. Case Study. Sustainability 2020, 12, 1960 .

AMA Style

Rosaura Castrillón-Mendoza, Javier M. Rey-Hernández, Francisco J. Rey-Martínez. Industrial Decarbonization by a New Energy-Baseline Methodology. Case Study. Sustainability. 2020; 12 (5):1960.

Chicago/Turabian Style

Rosaura Castrillón-Mendoza; Javier M. Rey-Hernández; Francisco J. Rey-Martínez. 2020. "Industrial Decarbonization by a New Energy-Baseline Methodology. Case Study." Sustainability 12, no. 5: 1960.

Conference paper
Published: 13 August 2019 in E3S Web of Conferences
Reads 0
Downloads 0

The high energy consumption, attached to a high energy demand in buildings, has led the development of several research projects with the target of reducing the energy consumption in the buildings. As a result of this high consumption, the increased CO2 emissions that have been generated in recent years, have reached alarming levels, which is why it is necessary to reduce the environmental impact which we are contributing to our planet through the use of energy. The European Directive on Building Performance (EPBD 2018/844/EU), recently updated, requires new buildings to be close to the Zero Energy Buildings (nZEBs), increasing the use of renewable energies on-site, and also highlight how to get to improve the cost-effective renovation of existing buildings with the introduction of building control and automation systems ( smart systems), as well as the energy savings and increase the efficiency of energy systems, by reducing CO2 emissions. The use of new renewable energy technologies integrated in buildings, with the aim of reducing the consumption of the facilities that all nZEB buildings must have, such as the ventilation system used as an Indoor Air Quality (IAQ) control technique. In this study, the energy management of the enthalpy ventilation control system is analysed, where dynamic monitoring is going on in the building controlled through Supervisory Control And Data Acquisition (SCADA), in combination with different ventilation systems as free-cooling, heat recovery and geothermal energy of an Earth Air Heat eXchanger (EAHX), all of them as strategies implemented in a real nZEB building (LUCIA) located on the campus at the University of Valladolid, with the goal of improving energy efficiency in ventilation. In order to get this aims, monitoring data of several energy parameters (temperature, air velocity, air flow rate, enthalpy, etc.) are measurements, they allow us to perform a control of the combined ventilation systems to achieve a high IAQ and analyze an optimization of the energy efficiency of the all systems and to study of energy recovery and savings of carbon emissions that directly affect the reduction of the impact of climate change. The results achieved are the energy efficiency of the building in ventilation and optimum system operation in cooling and heating mode. In addition, by controlling the ventilation, the IAQ of the nZEB building is improved.

ACS Style

Javier M Rey Hernandez; Sergio Lorenzo González; Julio F. San José-Alonso; Ana Tejero-González; Eloy Velasco; Francisco Javier Rey-Martínez. Smart energy management of combined ventilation systems in a nZEB. E3S Web of Conferences 2019, 111, 1 .

AMA Style

Javier M Rey Hernandez, Sergio Lorenzo González, Julio F. San José-Alonso, Ana Tejero-González, Eloy Velasco, Francisco Javier Rey-Martínez. Smart energy management of combined ventilation systems in a nZEB. E3S Web of Conferences. 2019; 111 ():1.

Chicago/Turabian Style

Javier M Rey Hernandez; Sergio Lorenzo González; Julio F. San José-Alonso; Ana Tejero-González; Eloy Velasco; Francisco Javier Rey-Martínez. 2019. "Smart energy management of combined ventilation systems in a nZEB." E3S Web of Conferences 111, no. : 1.

Journal article
Published: 28 December 2018 in Energies
Reads 0
Downloads 0

In order to achieve the objectives of the European 20/20/20 strategy, and to obtain a greater energy efficiency, integration of renewable energies and the reduction of carbon emissions, a District Heating (DH) system has been designed by the University of Valladolid (UVa), Spain, one of the most important DH fed by biomass fuel in Spain, supplying heating and domestic hot water (DHW) to 31 buildings in Valladolid, the majority of them, educational buildings on the University Campus. The aims of this paper were to study the change from an energy system fueled by natural gas to District Heating by biomass in a building on the campus of the University of Valladolid—the School of Engineering (EII)—studying its consumption from its connection to the District Heating system. An energy management methodology such as ISO 50001 is carried out, applied to efficiency systems in buildings, thus establishing new criteria of sustainability and economic value. In this paper, energy management will also be analyzed in accordance with the proposed tools of an Energy Management System (EMS) applied to the EII building, through the measurement of energy parameters, calculation of thermal consumption, thermal energy savings as a result of the change from system to District Heating by biomass, economic savings, reduction of environmental impact and indicators of thermal efficiency I100 and CUSUM indicator. Finally, the primary renewable and non-renewable energy efficiency indicators for the new District Heating system will be determined. The concept of the near Zero Energy Buildings is defined in the European Union (EU) in order to analyze an approach to an nZEB which results from replacing the natural gas heating system by a biomass District Heating system.

ACS Style

Rosaura Castrillón Mendoza; Javier M. Rey Hernández; Eloy Velasco Gómez; Julio F. San José Alonso; Francisco J. Rey Martínez. Analysis of the Methodology to Obtain Several Key Indicators Performance (KIP), by Energy Retrofitting of the Actual Building to the District Heating Fuelled by Biomass, Focusing on nZEB Goal: Case of Study. Energies 2018, 12, 93 .

AMA Style

Rosaura Castrillón Mendoza, Javier M. Rey Hernández, Eloy Velasco Gómez, Julio F. San José Alonso, Francisco J. Rey Martínez. Analysis of the Methodology to Obtain Several Key Indicators Performance (KIP), by Energy Retrofitting of the Actual Building to the District Heating Fuelled by Biomass, Focusing on nZEB Goal: Case of Study. Energies. 2018; 12 (1):93.

Chicago/Turabian Style

Rosaura Castrillón Mendoza; Javier M. Rey Hernández; Eloy Velasco Gómez; Julio F. San José Alonso; Francisco J. Rey Martínez. 2018. "Analysis of the Methodology to Obtain Several Key Indicators Performance (KIP), by Energy Retrofitting of the Actual Building to the District Heating Fuelled by Biomass, Focusing on nZEB Goal: Case of Study." Energies 12, no. 1: 93.

Journal article
Published: 01 November 2018 in Energies
Reads 0
Downloads 0

The building sector is responsible for a substantial part of the energy consumption and corresponding CO2 emissions. The European Union has consequently developed various directives, among which the updated Energy Performance of Buildings Directive 2018/844/EU stands out, aiming at minimizing the energy demand in buildings, improving the energy efficiency of their facilities and integrating renewable energies. The objective of the present study was to develop an analysis on the energy performance, related CO2 emissions and operating costs of the renewable energy technologies implemented within a multipurpose near Zero Energy Building (nZEB). The target building is an existing nZEB called LUCIA, located in Valladolid (Spain). Monitoring data provides the required information on the actual needs for electricity, cooling and heating. It is equipped with solar energy photovoltaic systems, a biomass boiler and a geothermal Earth to Air Heat Exchanger (EAHX) intended for meeting the ventilation thermal loads. All systems studied show favourable performances, but depend significantly on the particular characteristics of the building, the control algorithm and the climate of the location. Hence, design of these strategies for new nZEBs must consider all these factors. The combined use of the PhotoVoltaic PV System, the biomass and the EAHX reduces the CO2 emissions up to 123 to 170 tons/year in comparison with other fuels, entailing economic savings from the system operation of up to 43,000–50,000 €/year.

ACS Style

Javier M. Rey-Hernández; Eloy Velasco-Gómez; Julio F. San José-Alonso; Ana Tejero-González; Sergio L. González-González; Francisco J. Rey-Martínez. Monitoring Data Study of the Performance of Renewable Energy Systems in a Near Zero Energy Building in Spain: A Case Study. Energies 2018, 11, 2979 .

AMA Style

Javier M. Rey-Hernández, Eloy Velasco-Gómez, Julio F. San José-Alonso, Ana Tejero-González, Sergio L. González-González, Francisco J. Rey-Martínez. Monitoring Data Study of the Performance of Renewable Energy Systems in a Near Zero Energy Building in Spain: A Case Study. Energies. 2018; 11 (11):2979.

Chicago/Turabian Style

Javier M. Rey-Hernández; Eloy Velasco-Gómez; Julio F. San José-Alonso; Ana Tejero-González; Sergio L. González-González; Francisco J. Rey-Martínez. 2018. "Monitoring Data Study of the Performance of Renewable Energy Systems in a Near Zero Energy Building in Spain: A Case Study." Energies 11, no. 11: 2979.

Journal article
Published: 19 October 2018 in Energies
Reads 0
Downloads 0

This article analyses the reduction of energy consumption following the installation of district heating (DH) in the Miguel Delibes campus at the University of Valladolid (Spain), in terms of historical consumption and climate variables data. In order to achieve this goal, consumption models are carried out for each building, enabling the comparison of actual data with those foreseen in the model. This paper shows the statistical method used to accept these models, selecting the most influential climate variables data obtained by the models from the consumption baselines in the buildings at the Miguel Delibes campus through to the linear regression equations with a confidence level of 95%. This study shows that the best variables correlated with consumption are the degree-days for 58% of buildings and the average temperature for the remaining 42%. The savings obtained to date with this third generation network have been significantly higher than the 21% average for 33% of the campus buildings. In the case of 17% of the buildings, there was a significant increase in consumption of 20%, and in the case of the remaining 50% of the buildings, no significant differences were found between consumption before and after installation of district heating.

ACS Style

Ana M. Marina Domingo; Javier M. Rey-Hernández; Julio F. San José Alonso; Raquel Mata Crespo; Francisco J. Rey Martínez. Energy Efficiency Analysis Carried Out by Installing District Heating on a University Campus. A Case Study in Spain. Energies 2018, 11, 2826 .

AMA Style

Ana M. Marina Domingo, Javier M. Rey-Hernández, Julio F. San José Alonso, Raquel Mata Crespo, Francisco J. Rey Martínez. Energy Efficiency Analysis Carried Out by Installing District Heating on a University Campus. A Case Study in Spain. Energies. 2018; 11 (10):2826.

Chicago/Turabian Style

Ana M. Marina Domingo; Javier M. Rey-Hernández; Julio F. San José Alonso; Raquel Mata Crespo; Francisco J. Rey Martínez. 2018. "Energy Efficiency Analysis Carried Out by Installing District Heating on a University Campus. A Case Study in Spain." Energies 11, no. 10: 2826.

Journal article
Published: 01 September 2018 in Energy and Buildings
Reads 0
Downloads 0

Over the last few years, studies have predicted an increase in the overall air temperature due to climate change. Today's society is already sensing this change, which could have a negative impact on the environment and efforts are being made to seek all possible measures to curb it. One of the consequences of this temperature rise would be its effect on indoor comfort within buildings, which may cause higher energy consumption and operational costs, while reducing the useful lifetime of air-conditioning equipment. In this paper, an existing zero energy building (ZEB) is being studied to understand the possible effects of climate change on its zero energy status. The building is also a zero carbon building because all of its generated energies come from renewable sources (biomass, geothermal and solar photovoltaic systems). The building LUCIA has the highest innovative technologies in energy systems, design and construction elements and is currently considered as one of the top three buildings with the highest LEED certification in the world. According to current European regulations, buildings will tend to become self-sufficient in terms of energy after 2020, and therefore this study will help us to understand the changes in energy consumption within a long-term timeframe, for such zero-energy buildings. With the aid of the DesignBuilder version 5 software and its EnergyPlus building energy engine, a building model is simulated and energy consumption is analyzed for the years 2020, 2050 and 2080 timeframe. The climatic conditions pertain to the city of Valladolid, Spain, which has a continental climate, while the expected changes in climatic conditions have been produced through the methodology developed by the University of Southampton, called CCworldweathergen. Results have shown that the cooling demand would significantly increase for the years 2050 and 2080, while space heating would drop. This will increase the overall demand for burning more biofuels to cover the added demand in absorption cooling systems. Moreover, the previously excess generated electricity of the building by photovoltaics would then be totally consumed within the building due to increased demand. This implies that the installed systems will operate for longer hours, which will increase maintenance and replacement costs. As a result of this study, it becomes possible to quantify the expected changes in energy consumption and prepare preventive actions to anticipate this change, while improving the management and control of both the energy systems and the building.

ACS Style

Javier M Rey Hernandez; Charles Yousif; Damien Gatt; Eloy Velasco; Julio San José; Francisco Javier Rey-Martínez. Modelling the long-term effect of climate change on a zero energy and carbon dioxide building through energy efficiency and renewables. Energy and Buildings 2018, 174, 85 -96.

AMA Style

Javier M Rey Hernandez, Charles Yousif, Damien Gatt, Eloy Velasco, Julio San José, Francisco Javier Rey-Martínez. Modelling the long-term effect of climate change on a zero energy and carbon dioxide building through energy efficiency and renewables. Energy and Buildings. 2018; 174 ():85-96.

Chicago/Turabian Style

Javier M Rey Hernandez; Charles Yousif; Damien Gatt; Eloy Velasco; Julio San José; Francisco Javier Rey-Martínez. 2018. "Modelling the long-term effect of climate change on a zero energy and carbon dioxide building through energy efficiency and renewables." Energy and Buildings 174, no. : 85-96.

Article
Published: 06 April 2018 in Energies
Reads 0
Downloads 0

This paper develops an energy analysis for an existing near Zero Energy (nZEB) and Zero Carbon Emissions building called LUCIA, located at the university campus in Valladolid (Spain). It is designed to supply electricity, cooling and heating needs through solar energy (Photovoltaic Systems, PV), biomass and an Earth–Air Heat Exchanger (EAHE), besides a Combined Heat Power (CHP). It is currently among the top three buildings with the highest LEED certification in the World. The building model is simulated with DesignBuilder version 5. The results of the energy analysis illustrate the heating, cooling and lighting consumptions expected, besides other demands and energy uses. From this data, we carried out an energy balance of the nZEB, which will help to plan preventive actions when compared to the actual energy consumptions, improving the management and control of both the building and its systems. The primary energy indicator obtained is 67 kWh/m2 a year, and 121 kWh/m2 a year for renewable energy generation, with respect to 55 kWh/m2 and 45 kWh/m2 set as reference in Europe. The Renewable Energy Ratio (RER) is 0.66. These indicators become a useful tool for the energy analysis of the nZEB according to the requirements in the European regulations and for its comparison with further nZEB.

ACS Style

Javier M. Rey-Hernández; Eloy Velasco-Gómez; Ana Tejero-González; Francisco J. Rey-Martínez; Julio F. San José-Alonso. Energy Analysis at a Near Zero Energy Building. A Case-Study in Spain. Energies 2018, 11, 857 .

AMA Style

Javier M. Rey-Hernández, Eloy Velasco-Gómez, Ana Tejero-González, Francisco J. Rey-Martínez, Julio F. San José-Alonso. Energy Analysis at a Near Zero Energy Building. A Case-Study in Spain. Energies. 2018; 11 (4):857.

Chicago/Turabian Style

Javier M. Rey-Hernández; Eloy Velasco-Gómez; Ana Tejero-González; Francisco J. Rey-Martínez; Julio F. San José-Alonso. 2018. "Energy Analysis at a Near Zero Energy Building. A Case-Study in Spain." Energies 11, no. 4: 857.