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4 results on '"Antonio M. Puertas"'

1. Model for the Discharging of a Dual PCM Heat Storage Tank and Its Experimental Validation

Author

Artur Nemś and Antonio M. Puertas

Subjects
thermal storage, phase change materials, heat transfer process, Technology
Abstract

The important topic of modelling tanks filled with phase change materials (PCMs) is discussed in this article. Due to the increasing use of heating and cooling installations, tanks containing two types of PCMs are the subject of many experimental analyses. However, there are still deficiencies in their models, which are presented in this paper. The theory model was created in order to design two tanks, each with a volume of 2 m3. They were filled with water and containers with two PCMs. The modelled tanks were meant to replace the existing water tanks that were previously used in the solar heating and cooling installation in a research building located in the southern part of Spain. After the tanks were assembled, the model was validated during the summer period when the designed storage tanks supported the operation of the solar system operating in the cooling mode. The created model consists of a 1D description of the heat transfer in the storage tank, and also a 1D description of the phase change in the containers with the PCMs. The model takes into account the front of the phase change and also discusses its impact on the thermal efficiency of the tanks. The agreement of the water output temperature is very good and validates the model, which can then be used to provide further details on the operation of the storage system—in particular, heat fluxes or a fraction of solid or liquid PCM.

Published
2020
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2. Development and Results from Application of PCM-Based Storage Tanks in a Solar Thermal Comfort System of an Institutional Building—A Case Study

Author

F. Javier Batlles, Bartosz Gil, Svetlana Ushak, Jacek Kasperski, Marcos Luján, Diana Maldonado, Magdalena Nemś, Artur Nemś, Antonio M. Puertas, Manuel S. Romero-Cano, Sabina Rosiek, and Mario Grageda

Subjects
thermal storage, phase change materials, solar cooling, Technology
Abstract

An important element of a solar installation is the storage tank. When properly selected and operated, it can bring numerous benefits. The presented research relates to a project that is implemented at the Solar Energy Research Center of the University of Almeria in Spain. In order to improve the operation of the solar cooling and heating system of the Center, it was upgraded with two newly designed storage tanks filled with phase change materials (PCM). As a result of design works, commercial material S10 was selected for the accumulation of cold, and S46 for the accumulation of heat, in an amount of 85% and 15%, respectively. The article presents in detail the process of selecting the PCM material, designing the installation, experimental research, and exergy analysis. Individual tasks were carried out by research groups cooperating under the PCMSOL EUROPEAN PROJECT. Results of tests conducted on the constructed installation indicate that daily energy saving when using a solar chiller with PCM tanks amounts to 40% during the cooling season.

Published
2020
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3. Development and Results from Application of PCM-Based Storage Tanks in a Solar Thermal Comfort System of an Institutional Building—A Case Study

Author

Antonio M. Puertas, Marcos Luján, Svetlana Ushak, Bartosz Gil, Jacek Kasperski, M. S. Romero-Cano, Diana Maldonado, Artur Nemś, F. Javier Batlles, Mario Grágeda, Sabina Rosiek, and Magdalena Nemś

Subjects
Chiller, Exergy, Control and Optimization, 020209 energy, Energy Engineering and Power Technology, 02 engineering and technology, Thermal energy storage, lcsh:Technology, Solar air conditioning, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, Process engineering, Engineering (miscellaneous), solar cooling, Renewable Energy, Sustainability and the Environment, business.industry, lcsh:T, thermal storage, 021001 nanoscience & nanotechnology, Solar energy, Heating system, phase change materials, Storage tank, Environmental science, 0210 nano-technology, business, Research center, Energy (miscellaneous)
Abstract

An important element of a solar installation is the storage tank. When properly selected and operated, it can bring numerous benefits. The presented research relates to a project that is implemented at the Solar Energy Research Center of the University of Almeria in Spain. In order to improve the operation of the solar cooling and heating system of the Center, it was upgraded with two newly designed storage tanks filled with phase change materials (PCM). As a result of design works, commercial material S10 was selected for the accumulation of cold, and S46 for the accumulation of heat, in an amount of 85% and 15%, respectively. The article presents in detail the process of selecting the PCM material, designing the installation, experimental research, and exergy analysis. Individual tasks were carried out by research groups cooperating under the PCMSOL EUROPEAN PROJECT. Results of tests conducted on the constructed installation indicate that daily energy saving when using a solar chiller with PCM tanks amounts to 40% during the cooling season.

Published
2020

4. Simulations of Melting of Encapsulated CaCl2·6H2O for Thermal Energy Storage Technologies

Author

Francisco Javier Batlles, M. S. Romero-Cano, Sabina Rosiek, Antonio M. Puertas, and Francisco Javier De las Nieves

Subjects
Void (astronomy), Control and Optimization, Materials science, Natural convection, Renewable Energy, Sustainability and the Environment, 020209 energy, Energy Engineering and Power Technology, Thermodynamics, 02 engineering and technology, Thermal conduction, Thermal energy storage, Thermostat, phase-change materials, thermal conductivity, solidification, melting, latent thermal energy storage, cylindrical containers, law.invention, Condensed Matter::Soft Condensed Matter, Thermal conductivity, law, 0202 electrical engineering, electronic engineering, information engineering, Thermal mass, Heat equation, Electrical and Electronic Engineering, Composite material, Engineering (miscellaneous), Energy (miscellaneous)
Abstract

We present in this work simulations using the finite difference approximation in 2D for the melting of an encapsulated phase-change material suitable for heat storage applications; in particular, we study CaCl2·6H2O in a cylindrical encapsulation of internal radius 8 mm. We choose this particular salt hydrate due to its availability and economic feasibility in high thermal mass building walls or storage. Considering only heat conduction, a thermostat is placed far from the capsule, providing heat for the melting of the phase-change material (PCM), which is initially frozen in a water bath. The difference in density between the solid and liquid phases is taken into account by considering a void in the solid PCM. A simple theoretical model is also presented, based on solving the heat equation in the steady state. The kinetics of melting is monitored by the total solid fraction and temperatures in the inner and outer surfaces of the capsule. The effect of different parameters is presented (thermostat temperature, capsule thickness, capsule conductivity and natural convection in the bath), showing the potential application of the method to select materials or geometries of the capsule.

Published
2017
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