Papers by Manuel Andrés Chicote
Modelling Approach for Hybrid PV/T Solar Panels with Integrated Phase Change Material (PCM) Layer
Proceedings of SWC2017/SHC2017, 2017
Proceedings of EuroSun 2018, 2018
Dynamic subarray achieves a compromise between sum rate and hardware complexity for millimeter wa... more Dynamic subarray achieves a compromise between sum rate and hardware complexity for millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems in which antenna elements are dynamically partitioned to radio frequency (RF) chain according to the channel state information. However, multiuser hybrid precoding for the dynamic subarray is intractable to solve as the antenna partitioning would result in the user unfairness and multiuser interference (MUI). In this paper, a novel multiuser hybrid precoding framework is proposed for the dynamic subarray architecture. Different from the existing schemes, the base station (BS) firstly selects the multiuser set based on the analog effective channel. And then the antenna partitioning algorithm allocates each antenna element to RF chain according to the maximal increment of the signal to the interference noise ratio (SINR). Finally, the hybrid precoding is optimized for the dynamic subarray architecture. By calculating SINRs on the analog effective channels of the selected users, the antenna partitioning can greatly reduce computation complexity and the size of the search space. Moreover, it also guarantees the user fairness since each antenna element is allocated to acquire the maximal SINR increment of all selected users. Extensive simulation results demonstrate that both the energy efficiency and sum rate of the proposed solution obviously outperforms that of the fixed subarrays, and obtains higher energy efficiency with slight loss of sum rate compared with the fully-connected architecture.
Dynamic Modeling and Optimization of Energy Use in Retrofitted Buildings at District Heating Level
Sustainability, 2021
In recent years, new technologies, such as Artificial Intelligence, are emerging to improve decis... more In recent years, new technologies, such as Artificial Intelligence, are emerging to improve decision making based on learning. Their use applied to the Architectural, Engineering and Construction (AEC) sector, together with the increased use of Building Information Modeling (BIM) methodology in all phases of a building’s life cycle, is opening up a wide range of opportunities in the sector. At the same time, the need to reduce CO2 emissions in cities is focusing on the energy renovation of existing buildings, thus tackling one of the main causes of these emissions. This paper shows the potentials, constraints and viable solutions of the use of Machine Learning/Artificial Intelligence approaches at the design stage of deep renovation building projects using As-Built BIM models as input to improve the decision-making process towards the uptake of energy efficiency measures. First, existing databases on buildings pathologies have been studied. Second, a Machine Learning based algorithm...
Applied Sciences, 2021
Peak shaving, demand response, fast fault detection, emissions and costs reduction are some of th... more Peak shaving, demand response, fast fault detection, emissions and costs reduction are some of the main objectives to meet in advanced district heating and cooling (DHC) systems. In order to enhance the operation of infrastructures, challenges such as supply temperature reduction and load uncertainty with the development of algorithms and technologies are growing. Therefore, traditional control strategies and diagnosis approaches cannot achieve these goals. Accordingly, to address these shortcomings, researchers have developed plenty of innovative methods based on their applications and features. The main purpose of this paper is to review recent publications that include both hard and soft computing implementations such as model predictive control and machine learning algorithms with applications also on both fourth and fifth generation district heating and cooling networks. After introducing traditional approaches, the innovative techniques, accomplished results and overview of th...
Water specific latent heat of vaporization (kJ/kg) ρ Densidad (kg•m-3) Density σ Constante de Ste... more Water specific latent heat of vaporization (kJ/kg) ρ Densidad (kg•m-3) Density σ Constante de Stefan-Boltzmann (W•m-2 •K-4) Stefan-Boltzmann's constant (W•m-2 •K-4) ψ Desfase horario (h) Time delay (h) ω Humedad específica del aire húmedo (kgv/kga.s.) Humidity ratio (kgv/kga.s.
Energies, 2017
Among solar thermal technologies for indoor heating, solar air heaters (SAH) are appealing for im... more Among solar thermal technologies for indoor heating, solar air heaters (SAH) are appealing for implementation on existing buildings due to their simplicity, fewer risks related to the working fluid, and possible independence from the building structure. However, existing research work mainly focuses on winter use and still fails in providing effective solutions for yearly operation, which would enhance their interest. With the aim of analysing an alternative summer use, this work firstly characterises a double channel-single pass solar air collector through experimentation. From the obtained results, modelling and simulation tasks have been conducted to evaluate the possibilities of using hot air, provided by the SAH, while operating under summer conditions within a closed loop, to feed an air-to-water heat exchanger for domestic hot water (DHW) production. The system is studied through simulation under two different configurations for a case study in Valladolid (Spain), during the period from May to September for different airflows in the closed loop. Results show that daily savings can vary from 27% to 85% among the different operating conditions; a configuration where make-up water is fed to the heat exchanger being preferable, with a dedicated water tank for the solar heated water storage of the minimum possible volume. The more favourable results for the harshest months highlight the interest of extending the use of the solar air heaters to the summer period.
Renewable and Sustainable Energy Reviews, 2016
A review on climate parameters affecting applicability of passive and low energy heating and cool... more A review on climate parameters affecting applicability of passive and low energy heating and cooling techniques is presented. The study has been developed from existing research work results, and aims to serve as a first-stage assessment tool of the viability of these solutions at a particular location, depending on outdoor conditions to be faced. This contribution starts with a justification of comprehensive climate analysis as the first step to evaluate whether a specific passive or low energy solution would be efficient, or on the contrary, it would incur in higher energy consumption. Comfort requirements indoors as well as building typology and use are then briefly tackled as they would determine actual applicability. It continues gathering the weather variables affecting passive solar, natural ventilation, free cooling and evaporative cooling technologies. Key climatic information is provided for the city of Valladolid (Spain), as an example. Finally it ends with an overview of existing tools for representing climate information in bioclimatic design. Thus, the main target of this paper is to serve as a guide for an adequate preselection of the optimal passive energy solutions in buildings at a specific site, from existing research on climate analysis.
Energy and Buildings, 2012
Nowadays, radiant ceiling systems can be considered among the technologies capable of meeting sus... more Nowadays, radiant ceiling systems can be considered among the technologies capable of meeting sustainable heating and cooling requirements. In order to adequately address design and simulation issues concerning these systems, correct evaluation of the heat transfer process is needed. The aim of this research is to present further evidence on the cooling capacity and heat transfer coefficients for a cooled radiant ceiling, assuring adequate thermal comfort levels in those possible different operation conditions. An experimental setup into a climate test room was developed and used to derive convenient results. The obtained values revealed that heat transfer evaluations on the basis of operative temperature as the unique reference temperature and corresponding total coefficient are not appropriate in real situations, but considering radiant and convective phenomena separately is strongly recommended.
Applied Thermal Engineering, 2013
h i g h l i g h t s < Two indirect evaporative cooler prototypes are experimentally characterised... more h i g h l i g h t s < Two indirect evaporative cooler prototypes are experimentally characterised. < Evaporative cooling improves heat recovery. < Influence on performance of different heat exchange area and cross section is studied. < Larger cross section favours evaporative cooling process. < Effect of smaller heat exchange area is compensated by that of larger cross section.
Versatile Lab‐Scale Test Rig for Experimental Analysis and Heat Transfer Modelling of Thermally Activated Building Systems
Energy Storage, 2020
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Papers by Manuel Andrés Chicote