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P. Dellicompagni
Instituto de Investigaciones en Energía No Convencional (INENCO), 5150 Bolivia Av., Salta 4400, Argentina

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Journal article
Published: 30 January 2021 in Energies
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Detailed analyses of melting processes in phase change material (PCM) glazing units, changes of direct transmittance as well as investigation of refraction index were provided based on laboratory measurements. The main goal of the study was to determine the direct light transmittance versus time under constant solar radiation intensity and stable temperature of the surrounding air. The experiment was conducted on a triple glazed unit with one cavity filled with a paraffin RT21HC as a PCM. The unit was installed in a special holder and exposed to the radiation from an artificial sun. The vertical illuminance was measured by luxmeters and compared with a reference case to determine the direct light transmittance. The transmittance was determined for the whole period of measurements when some specific artefacts were identified and theoretically explained based on values of refractive indexes for paraffins in the solid and liquid state, and for a glass. The melting process of a PCM in a glass unit was identified as a complex one, with interreflections and refraction of light on semi layers characterized by a different physical states (solid, liquid or mushy). These optical phenomena caused nonuniformity in light transmittance, especially when the PCM is in a mushy state. It was revealed that light transmittance versus temperature cannot be treated as a linear function.

ACS Style

Dariusz Heim; Michał Krempski-Smejda; Pablo Roberto Dellicompagni; Dominika Knera; Anna Wieprzkowicz; Judith Franco. Dynamics of Melting Process in Phase Change Material Windows Determined Based on Direct Light Transmission. Energies 2021, 14, 721 .

AMA Style

Dariusz Heim, Michał Krempski-Smejda, Pablo Roberto Dellicompagni, Dominika Knera, Anna Wieprzkowicz, Judith Franco. Dynamics of Melting Process in Phase Change Material Windows Determined Based on Direct Light Transmission. Energies. 2021; 14 (3):721.

Chicago/Turabian Style

Dariusz Heim; Michał Krempski-Smejda; Pablo Roberto Dellicompagni; Dominika Knera; Anna Wieprzkowicz; Judith Franco. 2021. "Dynamics of Melting Process in Phase Change Material Windows Determined Based on Direct Light Transmission." Energies 14, no. 3: 721.

Journal article
Published: 07 February 2020 in Applied Thermal Engineering
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Thermal storage systems with phase change materials offer a high density of energy with a moderate temperature variation as well as the possibility to keep the inner temperature within a comfort range. To achieve this goal, it is necessary to select the most suitable phase change material. In this line, numerical simulations are necessary to predict results and take decisions about the best material that will be implemented on buildings devices for thermal performing. This work aims to study numerically how the inner air temperature of a defined room changes when a double-glazed PCM-filled window is mounted. For this, a new methodology for latent heat was implemented by a temperature-dependent Gauss-function, while an on/off strategy was considered to separate solid from liquid state. Both equations and parameters that involve thermophysical and optical properties were determined experimentally by Modulated Differential Scanning Calorimetry and spectroradiometer techniques, respectively. The resultant numerical model was implemented into the Simusol software for first time. It was found that the inner air temperature can be reduce up to 40% in average, in comparison with empty double-glazed window case, making it possible to reach the expected range of 20–26 °C. Simulation results also revealed that volumetric air flow for HVAC systems could be reduced up to 87% in winter, when PCM is implemented.

ACS Style

P. Dellicompagni; J. Franco; D. Heim; A. Wieprzkowicz. Numerical modeling of phase change materials using simusol software. Applied Thermal Engineering 2020, 170, 114772 .

AMA Style

P. Dellicompagni, J. Franco, D. Heim, A. Wieprzkowicz. Numerical modeling of phase change materials using simusol software. Applied Thermal Engineering. 2020; 170 ():114772.

Chicago/Turabian Style

P. Dellicompagni; J. Franco; D. Heim; A. Wieprzkowicz. 2020. "Numerical modeling of phase change materials using simusol software." Applied Thermal Engineering 170, no. : 114772.

Journal article
Published: 03 October 2018 in Renewable Energy
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This study analyzes the energy potential of a linear Fresnel solar (LFS) system based on a case study of the equipment mounted in the city of San Carlos, Salta province, Argentina. The average thermal power and thermal losses from the absorber and field pipes to the environment were calculated by hour, taking into account the hourly direct normal irradiance (DNI) obtained by Liu-Jordan method, based on global horizontal irradiation (GHI) measurements. This paper shows the amount of thermal energy that the LFS under study is able to generate for processes such as hard water desalination, electric power generation, and drying of vegetables. The results of the calculations show that the linear Fresnel system is capable of producing steam with thermal energy in the range of 460–1200 MJth, which means an annual production of 243 GJth. As for the power block, it is possible to obtain an annual generation of 1.5 GWhe, depending on operating conditions of the steam engine (288 rpm regime at 6 bar). The production of desalinated water reaches the range of 98–112 m3, depending on whether the steam is previously used for power electric generation or not.

ACS Style

Pablo Dellicompagni; Judith Franco. Potential uses of a prototype linear Fresnel concentration system. Renewable Energy 2018, 136, 1044 -1054.

AMA Style

Pablo Dellicompagni, Judith Franco. Potential uses of a prototype linear Fresnel concentration system. Renewable Energy. 2018; 136 ():1044-1054.

Chicago/Turabian Style

Pablo Dellicompagni; Judith Franco. 2018. "Potential uses of a prototype linear Fresnel concentration system." Renewable Energy 136, no. : 1044-1054.

Journal article
Published: 01 May 2018 in Energy
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A solar thermal system for steam generation was built in the city of San Carlos, Salta province, Argentina. This system is a Linear Fresnel Collector (LFC) used for producing steam for many applications, such as vegetable drying, water desalination, and power generation. A steam engine was coupled to this LFC for power generation. This paper shows the steam engine simulation, where thermal and dynamic equations were developed and written on the Simusol program. Mechanical power output and other parameters of the engine were also simulated as well as steam consumption, in order to establish laws in relation with mechanical load on axis and regulate the rpm regime and inlet pressure for optimal steam engine operation. The results of the simulation of power output are compared with experimental measurements. The steam engine was tested, and the obtained experimental results demonstrate the feasibility of generating power (i.e. 2 kW ± 5% (288 rpm) or 8 kW ± 2% (400 rpm)). Furthermore, it is found that the experimental measurements are in an acceptable agreement with the simulation outcomes of the analytical model. Finally, knowing the steam engine behavior allows to optimize the solar energy resource use for power generation.

ACS Style

Pablo Dellicompagni; Luis Saravia; Martín Altamirano; Judith Franco. Simulation and testing of a solar reciprocating steam engine. Energy 2018, 151, 662 -674.

AMA Style

Pablo Dellicompagni, Luis Saravia, Martín Altamirano, Judith Franco. Simulation and testing of a solar reciprocating steam engine. Energy. 2018; 151 ():662-674.

Chicago/Turabian Style

Pablo Dellicompagni; Luis Saravia; Martín Altamirano; Judith Franco. 2018. "Simulation and testing of a solar reciprocating steam engine." Energy 151, no. : 662-674.