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Marco Perino - One of the best experts on this subject based on the ideXlab platform.

  • Numerical model and simulation of a Solar Thermal Collector with slurry Phase Change Material (PCM) as the heat transfer fluid
    Solar Energy, 2016
    Co-Authors: Gianluca Serale, Francesco Goia, Marco Perino
    Abstract:

    Abstract The performance of conventional, water based, Solar Thermal Collectors is limited by some intrinsic limitations, such as the need for high irradiation levels and the heat loss due to the relatively high temperature of the heat transfer fluid. In order to overcome these limitations and to improve the performance of Solar Thermal Collectors, a different kind of heat transfer fluid can be proposed. This fluid is based on the exploitation of the latent heat of fusion/solidification of suspended particles, which change their state of aggregation at a micron scale, but maintain the liquid state of the fluid at a macroscopic scale. The so-called slurry phase materials, or PCS, are examples of this kind of material. In order to evaluate the effectiveness of such a concept, a numerical model of a PCS-based flat-plate Solar Thermal Collector has been developed, presented and discussed. This model has been derived from the well-known Hottel–Whillier model, but several changes have been implemented so that a phase change of the heat transfer fluid can be handled, as well as the thermophysical properties of a non-Newtonian fluid, such as those of a PCS. The paper presents the main and auxiliary equations that have been introduced to modify the Hottel–Whillier model. A numerical analysis conducted with the newly developed model is also presented in the paper. The aim of these simulations was to test the code and obtain a preliminary evaluation of the performance of the novel concept. Different (dynamic) boundary conditions (location, orientation, PCM concentration) were adopted to evaluate the performance of the PCS-based technology and compare it with that of a conventional Solar Thermal Collector. The outcomes of the simulations have proved model robustness and the possibility of using it for preliminary analysis. It was also shown that the adoption of the PCS as a heat transfer fluid can lead to an increase in Solar energy exploitation of different magnitude according to the climate. The greatest benefit can be achieved for cold climates. The limitations of the analysis (e.g. fixed, non-optimal flow rate) are also discussed.

  • characterization and energy performance of a slurry pcm based Solar Thermal Collector a numerical analysis
    Energy Procedia, 2014
    Co-Authors: Gianluca Serale, Francesco Goia, Sara Baronetto, Marco Perino
    Abstract:

    Abstract Flat plate Solar Thermal Collector is the most common technology for Solar energy conversion at the building scale. This technology has been established since long time and continuous developments have been achieved as time passed by; significant improvements of flat plate Solar Thermal Collectors are thus now limited. A novel approach to increase further the performance of this technology is based on the exploitation of the latent heat of the heat carrier fluid. In order to assess this strategy, a previously developed numerical model of flat plate Solar Thermal Collector with slurry PCM as heat carrier is herewith used to simulate the technology. The characterization and energy performance of such a system are herewith presented, based on the outcome of the numerical analysis. The results demonstrate that the novel approach is able to improve the performance of the system under different boundary conditions and in different climates: the improvement in the instantaneous efficiency is in the range 5-10%, while during the winter season the converted heat by the slurry PCM-based system is 20-40% higher than that of a conventional water based Solar Collector, depending on the climates – the colder the climate, the larger the improvement.

  • Numerical Model of a Slurry PCM-Based Solar Thermal Collector
    Lecture Notes in Electrical Engineering, 2013
    Co-Authors: Sara Baronetto, Gianluca Serale, Francesco Goia, Marco Perino
    Abstract:

    Flat-plate Solar Thermal Collector is the most common device to convert Solar energy into heat. This technology, which mostly adopts water-based fluids, has been widely investigated and improved since it was introduced, yet the exploitation of Solar energy is limited by innate technological constraints. An interesting approach to overcome the limitations of these systems is based on the exploitation of the latent heat of fusion/solidification of the fluid—e.g., using a microencapsulated PCM suspended in a water fluid phase, also called slurry PCM. In this chapter, the numerical model of a PCM-based flat-plate Solar Thermal Collector is presented and discussed. Starting from the well-known Hottel–Whillier equation, the physical–mathematical model of a water-based flat-plate Solar is suitably modified to incorporate the phase change equations and to account for the different thermophysical properties of a non-Newtonian fluid, such as the slurry PCM. Examples of applications are also given, developing the simulation of the Solar Collector for different boundary conditions and showing the improved performance of the PCM-based technology in comparison with a conventional Solar Thermal Collector.

Francesco Goia - One of the best experts on this subject based on the ideXlab platform.

  • Numerical model and simulation of a Solar Thermal Collector with slurry Phase Change Material (PCM) as the heat transfer fluid
    Solar Energy, 2016
    Co-Authors: Gianluca Serale, Francesco Goia, Marco Perino
    Abstract:

    Abstract The performance of conventional, water based, Solar Thermal Collectors is limited by some intrinsic limitations, such as the need for high irradiation levels and the heat loss due to the relatively high temperature of the heat transfer fluid. In order to overcome these limitations and to improve the performance of Solar Thermal Collectors, a different kind of heat transfer fluid can be proposed. This fluid is based on the exploitation of the latent heat of fusion/solidification of suspended particles, which change their state of aggregation at a micron scale, but maintain the liquid state of the fluid at a macroscopic scale. The so-called slurry phase materials, or PCS, are examples of this kind of material. In order to evaluate the effectiveness of such a concept, a numerical model of a PCS-based flat-plate Solar Thermal Collector has been developed, presented and discussed. This model has been derived from the well-known Hottel–Whillier model, but several changes have been implemented so that a phase change of the heat transfer fluid can be handled, as well as the thermophysical properties of a non-Newtonian fluid, such as those of a PCS. The paper presents the main and auxiliary equations that have been introduced to modify the Hottel–Whillier model. A numerical analysis conducted with the newly developed model is also presented in the paper. The aim of these simulations was to test the code and obtain a preliminary evaluation of the performance of the novel concept. Different (dynamic) boundary conditions (location, orientation, PCM concentration) were adopted to evaluate the performance of the PCS-based technology and compare it with that of a conventional Solar Thermal Collector. The outcomes of the simulations have proved model robustness and the possibility of using it for preliminary analysis. It was also shown that the adoption of the PCS as a heat transfer fluid can lead to an increase in Solar energy exploitation of different magnitude according to the climate. The greatest benefit can be achieved for cold climates. The limitations of the analysis (e.g. fixed, non-optimal flow rate) are also discussed.

  • characterization and energy performance of a slurry pcm based Solar Thermal Collector a numerical analysis
    Energy Procedia, 2014
    Co-Authors: Gianluca Serale, Francesco Goia, Sara Baronetto, Marco Perino
    Abstract:

    Abstract Flat plate Solar Thermal Collector is the most common technology for Solar energy conversion at the building scale. This technology has been established since long time and continuous developments have been achieved as time passed by; significant improvements of flat plate Solar Thermal Collectors are thus now limited. A novel approach to increase further the performance of this technology is based on the exploitation of the latent heat of the heat carrier fluid. In order to assess this strategy, a previously developed numerical model of flat plate Solar Thermal Collector with slurry PCM as heat carrier is herewith used to simulate the technology. The characterization and energy performance of such a system are herewith presented, based on the outcome of the numerical analysis. The results demonstrate that the novel approach is able to improve the performance of the system under different boundary conditions and in different climates: the improvement in the instantaneous efficiency is in the range 5-10%, while during the winter season the converted heat by the slurry PCM-based system is 20-40% higher than that of a conventional water based Solar Collector, depending on the climates – the colder the climate, the larger the improvement.

  • Numerical Model of a Slurry PCM-Based Solar Thermal Collector
    Lecture Notes in Electrical Engineering, 2013
    Co-Authors: Sara Baronetto, Gianluca Serale, Francesco Goia, Marco Perino
    Abstract:

    Flat-plate Solar Thermal Collector is the most common device to convert Solar energy into heat. This technology, which mostly adopts water-based fluids, has been widely investigated and improved since it was introduced, yet the exploitation of Solar energy is limited by innate technological constraints. An interesting approach to overcome the limitations of these systems is based on the exploitation of the latent heat of fusion/solidification of the fluid—e.g., using a microencapsulated PCM suspended in a water fluid phase, also called slurry PCM. In this chapter, the numerical model of a PCM-based flat-plate Solar Thermal Collector is presented and discussed. Starting from the well-known Hottel–Whillier equation, the physical–mathematical model of a water-based flat-plate Solar is suitably modified to incorporate the phase change equations and to account for the different thermophysical properties of a non-Newtonian fluid, such as the slurry PCM. Examples of applications are also given, developing the simulation of the Solar Collector for different boundary conditions and showing the improved performance of the PCM-based technology in comparison with a conventional Solar Thermal Collector.

Gianluca Serale - One of the best experts on this subject based on the ideXlab platform.

  • Numerical model and simulation of a Solar Thermal Collector with slurry Phase Change Material (PCM) as the heat transfer fluid
    Solar Energy, 2016
    Co-Authors: Gianluca Serale, Francesco Goia, Marco Perino
    Abstract:

    Abstract The performance of conventional, water based, Solar Thermal Collectors is limited by some intrinsic limitations, such as the need for high irradiation levels and the heat loss due to the relatively high temperature of the heat transfer fluid. In order to overcome these limitations and to improve the performance of Solar Thermal Collectors, a different kind of heat transfer fluid can be proposed. This fluid is based on the exploitation of the latent heat of fusion/solidification of suspended particles, which change their state of aggregation at a micron scale, but maintain the liquid state of the fluid at a macroscopic scale. The so-called slurry phase materials, or PCS, are examples of this kind of material. In order to evaluate the effectiveness of such a concept, a numerical model of a PCS-based flat-plate Solar Thermal Collector has been developed, presented and discussed. This model has been derived from the well-known Hottel–Whillier model, but several changes have been implemented so that a phase change of the heat transfer fluid can be handled, as well as the thermophysical properties of a non-Newtonian fluid, such as those of a PCS. The paper presents the main and auxiliary equations that have been introduced to modify the Hottel–Whillier model. A numerical analysis conducted with the newly developed model is also presented in the paper. The aim of these simulations was to test the code and obtain a preliminary evaluation of the performance of the novel concept. Different (dynamic) boundary conditions (location, orientation, PCM concentration) were adopted to evaluate the performance of the PCS-based technology and compare it with that of a conventional Solar Thermal Collector. The outcomes of the simulations have proved model robustness and the possibility of using it for preliminary analysis. It was also shown that the adoption of the PCS as a heat transfer fluid can lead to an increase in Solar energy exploitation of different magnitude according to the climate. The greatest benefit can be achieved for cold climates. The limitations of the analysis (e.g. fixed, non-optimal flow rate) are also discussed.

  • characterization and energy performance of a slurry pcm based Solar Thermal Collector a numerical analysis
    Energy Procedia, 2014
    Co-Authors: Gianluca Serale, Francesco Goia, Sara Baronetto, Marco Perino
    Abstract:

    Abstract Flat plate Solar Thermal Collector is the most common technology for Solar energy conversion at the building scale. This technology has been established since long time and continuous developments have been achieved as time passed by; significant improvements of flat plate Solar Thermal Collectors are thus now limited. A novel approach to increase further the performance of this technology is based on the exploitation of the latent heat of the heat carrier fluid. In order to assess this strategy, a previously developed numerical model of flat plate Solar Thermal Collector with slurry PCM as heat carrier is herewith used to simulate the technology. The characterization and energy performance of such a system are herewith presented, based on the outcome of the numerical analysis. The results demonstrate that the novel approach is able to improve the performance of the system under different boundary conditions and in different climates: the improvement in the instantaneous efficiency is in the range 5-10%, while during the winter season the converted heat by the slurry PCM-based system is 20-40% higher than that of a conventional water based Solar Collector, depending on the climates – the colder the climate, the larger the improvement.

  • Numerical Model of a Slurry PCM-Based Solar Thermal Collector
    Lecture Notes in Electrical Engineering, 2013
    Co-Authors: Sara Baronetto, Gianluca Serale, Francesco Goia, Marco Perino
    Abstract:

    Flat-plate Solar Thermal Collector is the most common device to convert Solar energy into heat. This technology, which mostly adopts water-based fluids, has been widely investigated and improved since it was introduced, yet the exploitation of Solar energy is limited by innate technological constraints. An interesting approach to overcome the limitations of these systems is based on the exploitation of the latent heat of fusion/solidification of the fluid—e.g., using a microencapsulated PCM suspended in a water fluid phase, also called slurry PCM. In this chapter, the numerical model of a PCM-based flat-plate Solar Thermal Collector is presented and discussed. Starting from the well-known Hottel–Whillier equation, the physical–mathematical model of a water-based flat-plate Solar is suitably modified to incorporate the phase change equations and to account for the different thermophysical properties of a non-Newtonian fluid, such as the slurry PCM. Examples of applications are also given, developing the simulation of the Solar Collector for different boundary conditions and showing the improved performance of the PCM-based technology in comparison with a conventional Solar Thermal Collector.

Sara Baronetto - One of the best experts on this subject based on the ideXlab platform.

  • characterization and energy performance of a slurry pcm based Solar Thermal Collector a numerical analysis
    Energy Procedia, 2014
    Co-Authors: Gianluca Serale, Francesco Goia, Sara Baronetto, Marco Perino
    Abstract:

    Abstract Flat plate Solar Thermal Collector is the most common technology for Solar energy conversion at the building scale. This technology has been established since long time and continuous developments have been achieved as time passed by; significant improvements of flat plate Solar Thermal Collectors are thus now limited. A novel approach to increase further the performance of this technology is based on the exploitation of the latent heat of the heat carrier fluid. In order to assess this strategy, a previously developed numerical model of flat plate Solar Thermal Collector with slurry PCM as heat carrier is herewith used to simulate the technology. The characterization and energy performance of such a system are herewith presented, based on the outcome of the numerical analysis. The results demonstrate that the novel approach is able to improve the performance of the system under different boundary conditions and in different climates: the improvement in the instantaneous efficiency is in the range 5-10%, while during the winter season the converted heat by the slurry PCM-based system is 20-40% higher than that of a conventional water based Solar Collector, depending on the climates – the colder the climate, the larger the improvement.

  • Numerical Model of a Slurry PCM-Based Solar Thermal Collector
    Lecture Notes in Electrical Engineering, 2013
    Co-Authors: Sara Baronetto, Gianluca Serale, Francesco Goia, Marco Perino
    Abstract:

    Flat-plate Solar Thermal Collector is the most common device to convert Solar energy into heat. This technology, which mostly adopts water-based fluids, has been widely investigated and improved since it was introduced, yet the exploitation of Solar energy is limited by innate technological constraints. An interesting approach to overcome the limitations of these systems is based on the exploitation of the latent heat of fusion/solidification of the fluid—e.g., using a microencapsulated PCM suspended in a water fluid phase, also called slurry PCM. In this chapter, the numerical model of a PCM-based flat-plate Solar Thermal Collector is presented and discussed. Starting from the well-known Hottel–Whillier equation, the physical–mathematical model of a water-based flat-plate Solar is suitably modified to incorporate the phase change equations and to account for the different thermophysical properties of a non-Newtonian fluid, such as the slurry PCM. Examples of applications are also given, developing the simulation of the Solar Collector for different boundary conditions and showing the improved performance of the PCM-based technology in comparison with a conventional Solar Thermal Collector.

J A Dieste - One of the best experts on this subject based on the ideXlab platform.

  • low and medium temperature Solar Thermal Collector based in innovative materials and improved heat exchange performance
    Energy Conversion and Management, 2013
    Co-Authors: Angel Fernandez, J A Dieste
    Abstract:

    Abstract A low and medium temperature Solar Thermal Collector for economical supply of heat between 40 and 90 °C has been developed. It is based on Solar concentrating systems, heat transfer optimization and substitution of metallic materials by plastic ones. The basic concept is the integration of a flat absorber strip inside semicircular reflector channels in contact with heated water without pressurization. This Collector is intended to be more efficient and cheaper than what actual commercial Collectors usually are so that the access to a clean and renewable energy would be more quickly redeemable and its use more effective during its life cycle, expanding its common application range. The substitution of traditional materials by surface treated Aluminum with TiNOx for the absorber and chromed thermoformed ABS for the reflector simplifies the production and assembly process. The definitive prototype has an aperture area of 0.225 m2. It was tested in Zaragoza (Spain) and the accumulated efficiency was between 41% and 57%, and the instantaneous efficiency reached 98% depending on the weather conditions. As all trials were made in parallel with a commercial Collector, in several cases the performance was over the commercial one.